/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.juneau.html;

import static org.apache.juneau.collections.JsonMap.*;
import static org.apache.juneau.common.utils.ThrowableUtils.*;
import static org.apache.juneau.common.utils.Utils.*;
import static org.apache.juneau.internal.CollectionUtils.*;

import java.lang.annotation.*;
import java.nio.charset.*;
import java.util.*;
import java.util.function.*;
import java.util.regex.*;

import org.apache.juneau.*;
import org.apache.juneau.collections.*;
import org.apache.juneau.common.utils.*;
import org.apache.juneau.internal.*;
import org.apache.juneau.svl.*;
import org.apache.juneau.utils.*;
import org.apache.juneau.xml.*;

/**
 * Serializes POJOs to HTTP responses as HTML documents.
 *
 * <h5 class='topic'>Media types</h5>
 * <p>
 * Handles <c>Accept</c> types:  <bc>text/html</bc>
 * <p>
 * Produces <c>Content-Type</c> types:  <bc>text/html</bc>
 *
 * <h5 class='topic'>Description</h5>
 * <p>
 * Same as {@link HtmlSerializer}, except wraps the response in <code><xt>&lt;html&gt;</code>,
 * <code><xt>&lt;head&gt;</code>, and <code><xt>&lt;body&gt;</code> tags so that it can be rendered in a browser.
 *
 * <p>
 * Configurable properties are typically specified via <ja>@HtmlDocConfig</ja>.
 *
 * <h5 class='section'>Example:</h5>
 * <p class='bjava'>
 *    <ja>@Rest</ja>(
 *       messages=<js>"nls/AddressBookResource"</js>,
 *       title=<js>"$L{title}"</js>,
 *       description=<js>"$L{description}"</js>
 *    )
 *    <ja>@HtmlDocConfig</ja>(
 *       navlinks={
 *          <js>"api: servlet:/api"</js>,
 *          <js>"doc: doc"</js>
 *       }
 *    )
 *    <jk>public class</jk> AddressBookResource <jk>extends</jk> BasicRestServlet {
 * </p>
 *
 * <p>
 * The <c>$L{...}</c> variable represent localized strings pulled from the resource bundle identified by the
 * <c>messages</c> annotation.
 * <br>These variables are replaced at runtime based on the HTTP request locale.
 * <br>Several built-in runtime variable types are defined, and the API can be extended to include user-defined variables.
 *
 * <h5 class='section'>Notes:</h5><ul>
 *    <li class='note'>This class is thread safe and reusable.
 * </ul>
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/HtmlBasics">HTML Basics</a>

 * </ul>
 */
public class HtmlDocSerializer extends HtmlStrippedDocSerializer {

   //-------------------------------------------------------------------------------------------------------------------
   // Static
   //-------------------------------------------------------------------------------------------------------------------

   private static final String[] EMPTY_ARRAY = {};

   /** Default serializer, all default settings. */
   public static final HtmlDocSerializer DEFAULT = new HtmlDocSerializer(create());

   /**
    * Creates a new builder for this object.
    *
    * @return A new builder.
    */
   public static Builder create() {
      return new Builder();
   }

   //-------------------------------------------------------------------------------------------------------------------
   // Builder
   //-------------------------------------------------------------------------------------------------------------------

   /**
    * Builder class.
    */
   public static class Builder extends HtmlStrippedDocSerializer.Builder {

      private static final Cache<HashKey,HtmlDocSerializer> CACHE = Cache.of(HashKey.class, HtmlDocSerializer.class).build();

      List<String> aside, footer, head, header, nav, navlinks, script, style, stylesheet;
      AsideFloat asideFloat;
      String noResultsMessage;
      boolean nowrap, resolveBodyVars;
      Class<? extends HtmlDocTemplate> template;
      List<Class<? extends HtmlWidget>> widgets;

      /**
       * Constructor, default settings.
       */
      protected Builder() {
         produces("text/html");
         accept("text/html");
         asideFloat = AsideFloat.RIGHT;
         noResultsMessage = "<p>no results</p>";
         template = BasicHtmlDocTemplate.class;
      }

      /**
       * Copy constructor.
       *
       * @param copyFrom The bean to copy from.
       */
      protected Builder(HtmlDocSerializer copyFrom) {
         super(copyFrom);
         aside = copy(copyFrom.aside);
         footer = copy(copyFrom.footer);
         head = copy(copyFrom.head);
         header = copy(copyFrom.header);
         nav = copy(copyFrom.nav);
         navlinks = copy(copyFrom.navlinks);
         script = copy(copyFrom.script);
         style = copy(copyFrom.style);
         stylesheet = copy(copyFrom.stylesheet);
         asideFloat = copyFrom.asideFloat;
         noResultsMessage = copyFrom.noResultsMessage;
         nowrap = copyFrom.nowrap;
         resolveBodyVars = copyFrom.resolveBodyVars;
         template = copyFrom.template;
         widgets = copy(copyFrom.widgets);
      }

      /**
       * Copy constructor.
       *
       * @param copyFrom The builder to copy from.
       */
      protected Builder(Builder copyFrom) {
         super(copyFrom);
         aside = copy(copyFrom.aside);
         footer = copy(copyFrom.footer);
         head = copy(copyFrom.head);
         header = copy(copyFrom.header);
         nav = copy(copyFrom.nav);
         navlinks = copy(copyFrom.navlinks);
         script = copy(copyFrom.script);
         style = copy(copyFrom.style);
         stylesheet = copy(copyFrom.stylesheet);
         asideFloat = copyFrom.asideFloat;
         noResultsMessage = copyFrom.noResultsMessage;
         nowrap = copyFrom.nowrap;
         resolveBodyVars = copyFrom.resolveBodyVars;
         template = copyFrom.template;
         widgets = copy(copyFrom.widgets);
      }

      @Override /* Context.Builder */
      public Builder copy() {
         return new Builder(this);
      }

      @Override /* Context.Builder */
      public HtmlDocSerializer build() {
         return cache(CACHE).build(HtmlDocSerializer.class);
      }

      @Override /* Context.Builder */
      public HashKey hashKey() {
         return HashKey.of(
            super.hashKey(),
            aside,
            footer,
            head,
            header,
            nav,
            navlinks,
            script,
            style,
            stylesheet,
            asideFloat,
            noResultsMessage,
            nowrap,
            resolveBodyVars,
            template,
            widgets
         );
      }

      //-----------------------------------------------------------------------------------------------------------------
      // Properties
      //-----------------------------------------------------------------------------------------------------------------

      /**
       * Aside section contents.
       *
       * <p>
       * Allows you to specify the contents of the aside section on the HTML page.
       * The aside section floats on the right of the page for providing content supporting the serialized content of
       * the page.
       *
       * <p>
       * By default, the aside section is empty.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .aside(
       *          <js>"&lt;ul&gt;"</js>,
       *          <js>" &lt;li&gt;Item 1"</js>,
       *          <js>" &lt;li&gt;Item 2"</js>,
       *          <js>" &lt;li&gt;Item 3"</js>,
       *          <js>"&lt;/ul&gt;"</js>
       *       )
       *       .build();
       * </p>
       *
       * <h5 class='section'>Notes:</h5><ul>
       *    <li class='note'>
       *       Format: HTML
       *    <li class='note'>
       *       Supports <a class="doclink" href="https://juneau.apache.org/docs/topics/RestServerSvlVariables">SVL Variables</a>
       *       (e.g. <js>"$L{my.localized.variable}"</js>).
       *    <li class='note'>
       *       A value of <js>"NONE"</js> can be used to force no value.
       *    <li class='note'>
       *       The parent value can be included by adding the literal <js>"INHERIT"</js> as a value.
       *    <li class='note'>
       *       Multiple values are combined with newlines into a single string.
       *    <li class='note'>
       *       On methods, this value is inherited from the <ja>@HtmlDocConfig</ja> annotation on the servlet/resource class.
       *    <li class='note'>
       *       On servlet/resource classes, this value is inherited from the <ja>@HtmlDocConfig</ja> annotation on the
       *       parent class.
       * </ul>
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder aside(String...value) {
         aside = merge(aside, value);
         return this;
      }

      /**
       * Returns the list of aside section contents.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #aside(String...)}.
       *
       * @return The list of aside section contents.
       * @see #aside(String...)
       */
      public List<String> aside() {
         if (aside == null)
            aside = list();
         return aside;
      }

      /**
       * Float aside section contents.
       *
       * <p>
       * Allows you to position the aside contents of the page around the main contents.
       *
       * <p>
       * By default, the aside section is floated to the right.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .aside(
       *          <js>"&lt;ul&gt;"</js>,
       *          <js>" &lt;li&gt;Item 1"</js>,
       *          <js>" &lt;li&gt;Item 2"</js>,
       *          <js>" &lt;li&gt;Item 3"</js>,
       *          <js>"&lt;/ul&gt;"</js>
       *       )
       *       .asideFloat(<jsf>RIGHT</jsf>)
       *       .build();
       * </p>
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder asideFloat(AsideFloat value) {
         asideFloat = value;
         return this;
      }

      /**
       * Footer section contents.
       *
       * <p>
       * Allows you to specify the contents of the footer section on the HTML page.
       *
       * <p>
       * By default, the footer section is empty.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .footer(
       *          <js>"&lt;b&gt;This interface is great!&lt;/b&gt;"</js>
       *       )
       *       .build();
       * </p>
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder footer(String...value) {
         footer = merge(footer, value);
         return this;
      }

      /**
       * Returns the list of footer section contents.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #footer(String...)}.
       *
       * @return The list of footer section contents.
       * @see #footer(String...)
       */
      public List<String> footer() {
         if (footer == null)
            footer = list();
         return footer;
      }

      /**
       * Additional head section content.
       *
       * <p>
       * Adds the specified HTML content to the head section of the page.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .head(
       *          <js>"&lt;link rel='icon' href='$U{servlet:/htdocs/mypageicon.ico}'&gt;"</js>
       *       )
       *       .build();
       * </p>
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder head(String...value) {
         head = merge(head, value);
         return this;
      }

      /**
       * Returns the list of head section contents.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #head(String...)}.
       *
       * @return The list of head section contents.
       * @see #head(String...)
       */
      public List<String> head() {
         if (head == null)
            head = list();
         return head;
      }

      /**
       * Header section contents.
       *
       * <p>
       * Allows you to override the contents of the header section on the HTML page.
       * The header section normally contains the title and description at the top of the page.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .header(
       *          <js>"&lt;h1&gt;My own header&lt;/h1&gt;"</js>
       *       )
       *       .build()
       * </p>
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder header(String...value) {
         header = merge(header, value);
         return this;
      }

      /**
       * Returns the list of header section contents.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #header(String...)}.
       *
       * @return The list of header section contents.
       * @see #header(String...)
       */
      public List<String> header() {
         if (header == null)
            header = list();
         return header;
      }

      /**
       * Nav section contents.
       *
       * <p>
       * Allows you to override the contents of the nav section on the HTML page.
       * The nav section normally contains the page links at the top of the page.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .nav(
       *          <js>"&lt;p class='special-navigation'&gt;This is my special navigation content&lt;/p&gt;"</js>
       *       )
       *       .build()
       * </p>
       *
       * <p>
       * When this property is specified, the {@link Builder#navlinks(String...)} property is ignored.
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder nav(String...value) {
         nav = merge(nav, value);
         return this;
      }

      /**
       * Returns the list of nav section contents.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #nav(String...)}.
       *
       * @return The list of nav section contents.
       * @see #nav(String...)
       */
      public List<String> nav() {
         if (nav == null)
            nav = list();
         return nav;
      }

      /**
       * Page navigation links.
       *
       * <p>
       * Adds a list of hyperlinks immediately under the title and description but above the content of the page.
       *
       * <p>
       * This can be used to provide convenient hyperlinks when viewing the REST interface from a browser.
       *
       * <p>
       * The value is an array of strings with two possible values:
       * <ul>
       *    <li>A key-value pair representing a hyperlink label and href:
       *       <br><js>"google: http://google.com"</js>
       *    <li>Arbitrary HTML.
       * </ul>
       *
       * <p>
       * Relative URLs are considered relative to the servlet path.
       * For example, if the servlet path is <js>"http://localhost/myContext/myServlet"</js>, and the
       * URL is <js>"foo"</js>, the link becomes <js>"http://localhost/myContext/myServlet/foo"</js>.
       * Absolute (<js>"/myOtherContext/foo"</js>) and fully-qualified (<js>"http://localhost2/foo"</js>) URLs
       * can also be used in addition to various other protocols specified by {@link UriResolver} such as
       * <js>"servlet:/..."</js>.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .navlinks(
       *          <js>"api: servlet:/api"</js>,
       *          <js>"stats: servlet:/stats"</js>,
       *          <js>"doc: doc"</js>
       *       )
       *       .build();
       * </p>
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder navlinks(String...value) {
         navlinks = mergeNavLinks(navlinks, value);
         return this;
      }

      /**
       * Returns the list of navlinks section contents.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #navlinks(String...)}.
       *
       * @return The list of navlinks section contents.
       * @see #navlinks(String...)
       */
      public List<String> navlinks() {
         if (navlinks == null)
            navlinks = list();
         return navlinks;
      }

      /**
       * No-results message.
       *
       * <p>
       * Allows you to specify the string message used when trying to serialize an empty array or empty list.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .noResultsMessage(<js>"&lt;b&gt;This interface is great!&lt;/b&gt;"</js>)
       *       .build();
       * </p>
       *
       * <p>
       * A value of <js>"NONE"</js> can be used to represent no value to differentiate it from an empty string.
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder noResultsMessage(String value) {
         noResultsMessage = value;
         return this;
      }

      /**
       * Prevent word wrap on page.
       *
       * <p>
       * Adds <js>"* {white-space:nowrap}"</js> to the CSS instructions on the page to prevent word wrapping.
       *
       * @return This object.
       */
      public Builder nowrap() {
         return nowrap(true);
      }

      /**
       * Same as {@link #nowrap()} but allows you to explicitly specify the boolean value.
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       * @see #nowrap()
       */
      public Builder nowrap(boolean value) {
         nowrap = value;
         return this;
      }

      /**
       * Resolve $ variables in serialized POJO.
       *
       * @return This object.
       */
      public Builder resolveBodyVars() {
         return resolveBodyVars(true);
      }

      /**
       * Same as {@link #resolveBodyVars()} but allows you to explicitly specify the boolean value.
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       * @see #nowrap()
       */
      public Builder resolveBodyVars(boolean value) {
         resolveBodyVars = value;
         return this;
      }

      /**
       * Adds the specified Javascript code to the HTML page.
       *
       * <p>
       * A shortcut on <ja>@Rest</ja> is also provided for this setting:
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .script(<js>"alert('hello!');"</js>)
       *       .build();
       * </p>
       *
       * @param value
       *    The value to add to this property.
       * @return This object.
       */
      public Builder script(String...value) {
         script = merge(script, value);
         return this;
      }

      /**
       * Returns the list of page script contents.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #script(String...)}.
       *
       * @return The list of page script contents.
       * @see #script(String...)
       */
      public List<String> script() {
         if (script == null)
            script = list();
         return script;
      }

      /**
       * Adds the specified CSS instructions to the HTML page.
       *
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .style(
       *          <js>"h3 { color: red; }"</js>,
       *          <js>"h5 { font-weight: bold; }"</js>
       *       )
       *       .build();
       * </p>
       *
       * @param value
       *    The value to add to this property.
       * @return This object.
       */
      public Builder style(String...value) {
         style = merge(style, value);
         return this;
      }

      /**
       * Returns the list of page style contents.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #style(String...)}.
       *
       * @return The list of page style contents.
       * @see #style(String...)
       */
      public List<String> style() {
         if (style == null)
            style = list();
         return style;
      }

      /**
       * Adds to the list of stylesheet URLs.
       *
       * <p>
       * Note that this stylesheet is controlled by the <code><ja>@Rest</ja>.stylesheet()</code> annotation.
       *
       * @param value
       *    The value to add to this property.
       * @return This object.
       */
      public Builder stylesheet(String...value) {
         stylesheet = merge(stylesheet, value);
         return this;
      }

      /**
       * Returns the list of stylesheet URLs.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #stylesheet(String...)}.
       *
       * @return The list of stylesheet URLs.
       * @see #stylesheet(String...)
       */
      public List<String> stylesheet() {
         if (stylesheet == null)
            stylesheet = list();
         return stylesheet;
      }

      /**
       * HTML document template.
       *
       * <p>
       * Specifies the template to use for serializing the page.
       *
       * <p>
       * By default, the {@link BasicHtmlDocTemplate} class is used to construct the contents of the HTML page, but
       * can be overridden with your own custom implementation class.
       *
       * <h5 class='section'>Example:</h5>
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .template(MySpecialDocTemplate.<jk>class</jk>)
       *       .build();
       * </p>
       *
       * @param value
       *    The new value for this property.
       * @return This object.
       */
      public Builder template(Class<? extends HtmlDocTemplate> value) {
         template = value;
         return this;
      }

      /**
       * HTML Widgets.
       *
       * <p>
       * Defines widgets that can be used in conjunction with string variables of the form <js>"$W{name}"</js>to quickly
       * generate arbitrary replacement text.
       *
       * Widgets resolve the following variables:
       * <ul class='spaced-list'>
       *    <li><js>"$W{name}"</js> - Contents returned by {@link HtmlWidget#getHtml(VarResolverSession)}.
       *    <li><js>"$W{name.script}"</js> - Contents returned by {@link HtmlWidget#getScript(VarResolverSession)}.
       *       <br>The script contents are automatically inserted into the <xt>&lt;head/script&gt;</xt> section
       *           in the HTML page.
       *    <li><js>"$W{name.style}"</js> - Contents returned by {@link HtmlWidget#getStyle(VarResolverSession)}.
       *       <br>The styles contents are automatically inserted into the <xt>&lt;head/style&gt;</xt> section
       *           in the HTML page.
       * </ul>
       *
       * <p>
       * The following examples shows how to associate a widget with a REST method and then have it rendered in the links
       * and aside section of the page:
       *
       * <p class='bjava'>
       *    WriterSerializer <jv>serializer</jv> = HtmlDocSerializer
       *       .<jsm>create</jsm>()
       *       .widgets(
       *          MyWidget.<jk>class</jk>
       *       )
       *       .navlinks(
       *          <js>"$W{MyWidget}"</js>
       *       )
       *       .aside(
       *          <js>"Check out this widget:  $W{MyWidget}"</js>
       *       )
       *       .build();
       * </p>
       *
       * <h5 class='section'>Notes:</h5><ul>
       *    <li class='note'>
       *       Widgets are inherited from super classes, but can be overridden by reusing the widget name.
       * </ul>
       *
       * <h5 class='section'>See Also:</h5><ul>
       *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/HtmlWidgets">Widgets</a>
       * </ul>
       *
       * @param values The values to add to this setting.
       * @return This object.
       */
      @SuppressWarnings("unchecked")
      public Builder widgets(Class<? extends HtmlWidget>...values) {
         addAll(widgets(), values);
         return this;
      }

      /**
       * Returns the list of page widgets.
       *
       * <p>
       * Gives access to the inner list if you need to make more than simple additions via {@link #widgets(Class...)}.
       *
       * @return The list of page widgets.
       * @see #widgets(Class...)
       */
      public List<Class<? extends HtmlWidget>> widgets() {
         if (widgets == null)
            widgets = list();
         return widgets;
      }
      @Override /* Overridden from Builder */
      public Builder annotations(Annotation...values) {
         super.annotations(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder apply(AnnotationWorkList work) {
         super.apply(work);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder applyAnnotations(Object...from) {
         super.applyAnnotations(from);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder applyAnnotations(Class<?>...from) {
         super.applyAnnotations(from);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder cache(Cache<HashKey,? extends org.apache.juneau.Context> value) {
         super.cache(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder debug() {
         super.debug();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder debug(boolean value) {
         super.debug(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder impl(Context value) {
         super.impl(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder type(Class<? extends org.apache.juneau.Context> value) {
         super.type(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanClassVisibility(Visibility value) {
         super.beanClassVisibility(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanConstructorVisibility(Visibility value) {
         super.beanConstructorVisibility(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanContext(BeanContext value) {
         super.beanContext(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanContext(BeanContext.Builder value) {
         super.beanContext(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanDictionary(java.lang.Class<?>...values) {
         super.beanDictionary(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanFieldVisibility(Visibility value) {
         super.beanFieldVisibility(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanInterceptor(Class<?> on, Class<? extends org.apache.juneau.swap.BeanInterceptor<?>> value) {
         super.beanInterceptor(on, value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanMapPutReturnsOldValue() {
         super.beanMapPutReturnsOldValue();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanMethodVisibility(Visibility value) {
         super.beanMethodVisibility(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanProperties(Map<String,Object> values) {
         super.beanProperties(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanProperties(Class<?> beanClass, String properties) {
         super.beanProperties(beanClass, properties);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanProperties(String beanClassName, String properties) {
         super.beanProperties(beanClassName, properties);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesExcludes(Map<String,Object> values) {
         super.beanPropertiesExcludes(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesExcludes(Class<?> beanClass, String properties) {
         super.beanPropertiesExcludes(beanClass, properties);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesExcludes(String beanClassName, String properties) {
         super.beanPropertiesExcludes(beanClassName, properties);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesReadOnly(Map<String,Object> values) {
         super.beanPropertiesReadOnly(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesReadOnly(Class<?> beanClass, String properties) {
         super.beanPropertiesReadOnly(beanClass, properties);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesReadOnly(String beanClassName, String properties) {
         super.beanPropertiesReadOnly(beanClassName, properties);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesWriteOnly(Map<String,Object> values) {
         super.beanPropertiesWriteOnly(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesWriteOnly(Class<?> beanClass, String properties) {
         super.beanPropertiesWriteOnly(beanClass, properties);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beanPropertiesWriteOnly(String beanClassName, String properties) {
         super.beanPropertiesWriteOnly(beanClassName, properties);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beansRequireDefaultConstructor() {
         super.beansRequireDefaultConstructor();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beansRequireSerializable() {
         super.beansRequireSerializable();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder beansRequireSettersForGetters() {
         super.beansRequireSettersForGetters();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder dictionaryOn(Class<?> on, java.lang.Class<?>...values) {
         super.dictionaryOn(on, values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableBeansRequireSomeProperties() {
         super.disableBeansRequireSomeProperties();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableIgnoreMissingSetters() {
         super.disableIgnoreMissingSetters();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableIgnoreTransientFields() {
         super.disableIgnoreTransientFields();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableIgnoreUnknownNullBeanProperties() {
         super.disableIgnoreUnknownNullBeanProperties();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableInterfaceProxies() {
         super.disableInterfaceProxies();
         return this;
      }

      @Override /* Overridden from Builder */
      public <T> Builder example(Class<T> pojoClass, T o) {
         super.example(pojoClass, o);
         return this;
      }

      @Override /* Overridden from Builder */
      public <T> Builder example(Class<T> pojoClass, String json) {
         super.example(pojoClass, json);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder findFluentSetters() {
         super.findFluentSetters();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder findFluentSetters(Class<?> on) {
         super.findFluentSetters(on);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder ignoreInvocationExceptionsOnGetters() {
         super.ignoreInvocationExceptionsOnGetters();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder ignoreInvocationExceptionsOnSetters() {
         super.ignoreInvocationExceptionsOnSetters();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder ignoreUnknownBeanProperties() {
         super.ignoreUnknownBeanProperties();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder ignoreUnknownEnumValues() {
         super.ignoreUnknownEnumValues();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder implClass(Class<?> interfaceClass, Class<?> implClass) {
         super.implClass(interfaceClass, implClass);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder implClasses(Map<Class<?>,Class<?>> values) {
         super.implClasses(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder interfaceClass(Class<?> on, Class<?> value) {
         super.interfaceClass(on, value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder interfaces(java.lang.Class<?>...value) {
         super.interfaces(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder locale(Locale value) {
         super.locale(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder mediaType(MediaType value) {
         super.mediaType(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder notBeanClasses(java.lang.Class<?>...values) {
         super.notBeanClasses(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder notBeanPackages(String...values) {
         super.notBeanPackages(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder propertyNamer(Class<? extends org.apache.juneau.PropertyNamer> value) {
         super.propertyNamer(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder propertyNamer(Class<?> on, Class<? extends org.apache.juneau.PropertyNamer> value) {
         super.propertyNamer(on, value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder sortProperties() {
         super.sortProperties();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder sortProperties(java.lang.Class<?>...on) {
         super.sortProperties(on);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder stopClass(Class<?> on, Class<?> value) {
         super.stopClass(on, value);
         return this;
      }

      @Override /* Overridden from Builder */
      public <T, S> Builder swap(Class<T> normalClass, Class<S> swappedClass, ThrowingFunction<T,S> swapFunction) {
         super.swap(normalClass, swappedClass, swapFunction);
         return this;
      }

      @Override /* Overridden from Builder */
      public <T, S> Builder swap(Class<T> normalClass, Class<S> swappedClass, ThrowingFunction<T,S> swapFunction, ThrowingFunction<S,T> unswapFunction) {
         super.swap(normalClass, swappedClass, swapFunction, unswapFunction);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder swaps(Object...values) {
         super.swaps(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder swaps(Class<?>...values) {
         super.swaps(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder timeZone(TimeZone value) {
         super.timeZone(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder typeName(Class<?> on, String value) {
         super.typeName(on, value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder typePropertyName(String value) {
         super.typePropertyName(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder typePropertyName(Class<?> on, String value) {
         super.typePropertyName(on, value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder useEnumNames() {
         super.useEnumNames();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder useJavaBeanIntrospector() {
         super.useJavaBeanIntrospector();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder detectRecursions() {
         super.detectRecursions();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder detectRecursions(boolean value) {
         super.detectRecursions(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder ignoreRecursions() {
         super.ignoreRecursions();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder ignoreRecursions(boolean value) {
         super.ignoreRecursions(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder initialDepth(int value) {
         super.initialDepth(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder maxDepth(int value) {
         super.maxDepth(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder accept(String value) {
         super.accept(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addBeanTypes() {
         super.addBeanTypes();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addBeanTypes(boolean value) {
         super.addBeanTypes(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addRootType() {
         super.addRootType();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addRootType(boolean value) {
         super.addRootType(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder keepNullProperties() {
         super.keepNullProperties();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder keepNullProperties(boolean value) {
         super.keepNullProperties(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder listener(Class<? extends org.apache.juneau.serializer.SerializerListener> value) {
         super.listener(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder produces(String value) {
         super.produces(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder sortCollections() {
         super.sortCollections();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder sortCollections(boolean value) {
         super.sortCollections(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder sortMaps() {
         super.sortMaps();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder sortMaps(boolean value) {
         super.sortMaps(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder trimEmptyCollections() {
         super.trimEmptyCollections();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder trimEmptyCollections(boolean value) {
         super.trimEmptyCollections(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder trimEmptyMaps() {
         super.trimEmptyMaps();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder trimEmptyMaps(boolean value) {
         super.trimEmptyMaps(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder trimStrings() {
         super.trimStrings();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder trimStrings(boolean value) {
         super.trimStrings(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder uriContext(UriContext value) {
         super.uriContext(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder uriRelativity(UriRelativity value) {
         super.uriRelativity(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder uriResolution(UriResolution value) {
         super.uriResolution(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder fileCharset(Charset value) {
         super.fileCharset(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder maxIndent(int value) {
         super.maxIndent(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder quoteChar(char value) {
         super.quoteChar(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder quoteCharOverride(char value) {
         super.quoteCharOverride(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder sq() {
         super.sq();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder streamCharset(Charset value) {
         super.streamCharset(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder useWhitespace() {
         super.useWhitespace();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder useWhitespace(boolean value) {
         super.useWhitespace(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder ws() {
         super.ws();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addBeanTypesXml() {
         super.addBeanTypesXml();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addBeanTypesXml(boolean value) {
         super.addBeanTypesXml(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addNamespaceUrisToRoot() {
         super.addNamespaceUrisToRoot();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addNamespaceUrisToRoot(boolean value) {
         super.addNamespaceUrisToRoot(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder defaultNamespace(Namespace value) {
         super.defaultNamespace(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableAutoDetectNamespaces() {
         super.disableAutoDetectNamespaces();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableAutoDetectNamespaces(boolean value) {
         super.disableAutoDetectNamespaces(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder enableNamespaces() {
         super.enableNamespaces();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder enableNamespaces(boolean value) {
         super.enableNamespaces(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder namespaces(Namespace...values) {
         super.namespaces(values);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder ns() {
         super.ns();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addBeanTypesHtml() {
         super.addBeanTypesHtml();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addBeanTypesHtml(boolean value) {
         super.addBeanTypesHtml(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addKeyValueTableHeaders() {
         super.addKeyValueTableHeaders();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder addKeyValueTableHeaders(boolean value) {
         super.addKeyValueTableHeaders(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableDetectLabelParameters() {
         super.disableDetectLabelParameters();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableDetectLabelParameters(boolean value) {
         super.disableDetectLabelParameters(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableDetectLinksInStrings() {
         super.disableDetectLinksInStrings();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder disableDetectLinksInStrings(boolean value) {
         super.disableDetectLinksInStrings(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder labelParameter(String value) {
         super.labelParameter(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder uriAnchorText(AnchorText value) {
         super.uriAnchorText(value);
         return this;
      }
      //-----------------------------------------------------------------------------------------------------------------
      // Helpers
      //-----------------------------------------------------------------------------------------------------------------

      private static <T> List<T> copy(List<T> s) {
         return s == null || s.isEmpty() ? null : copyOf(s);
      }

      private static <T> List<T> copy(T[] s) {
         return s.length == 0 ? null : list(s);
      }

      private List<String> merge(List<String> old, String[] newValues) {
         List<String> x = Utils.listOfSize(newValues.length);
         for (String s : newValues) {
            if ("NONE".equals(s)) {
               if (old != null)
                  old.clear();
            } else if ("INHERIT".equals(s)) {
               if (old != null)
                  x.addAll(old);
            } else {
               x.add(s);
            }
         }
         return x;
      }

      private List<String> mergeNavLinks(List<String> old, String[] newValues) {
         List<String> x = Utils.listOfSize(newValues.length);
         for (String s : newValues) {
            if ("NONE".equals(s)) {
               if (old != null)
                  old.clear();
            } else if ("INHERIT".equals(s)) {
               if (old != null)
                  x.addAll(old);
            } else if (s.indexOf('[') != -1 && INDEXED_LINK_PATTERN.matcher(s).matches()) {
               Matcher lm = INDEXED_LINK_PATTERN.matcher(s);
               lm.matches();
               String key = lm.group(1);
               int index = Math.min(x.size(), Integer.parseInt(lm.group(2)));
               String remainder = lm.group(3);
               x.add(index, key.isEmpty() ? remainder : key + ":" + remainder);
            } else {
               x.add(s);
            }
         }
         return x;
      }

      private static final Pattern INDEXED_LINK_PATTERN = Pattern.compile("(?s)(\\S*)\\[(\\d+)\\]\\:(.*)");
   }

   //-------------------------------------------------------------------------------------------------------------------
   // Instance
   //-------------------------------------------------------------------------------------------------------------------

   final String[] style, stylesheet, script, navlinks, head, header, nav, aside, footer;
   final AsideFloat asideFloat;
   final String noResultsMessage;
   final boolean nowrap, resolveBodyVars;
   final Class<? extends HtmlDocTemplate> template;
   final List<Class<? extends HtmlWidget>> widgets;

   private final HtmlWidgetMap widgetMap;
   private final HtmlWidget[] widgetArray;
   private final HtmlDocTemplate templateBean;

   private volatile HtmlSchemaDocSerializer schemaSerializer;

   /**
    * Constructor.
    *
    * @param builder The builder for this object.
    */
   public HtmlDocSerializer(Builder builder) {
      super(builder);
      style = builder.style != null ? toArray(builder.style) : EMPTY_ARRAY;
      stylesheet = builder.stylesheet != null ? toArray(builder.stylesheet) : EMPTY_ARRAY;
      script = builder.script != null ? toArray(builder.script) : EMPTY_ARRAY;
      head = builder.head != null ? toArray(builder.head) : EMPTY_ARRAY;
      header = builder.header != null ? toArray(builder.header) : EMPTY_ARRAY;
      nav = builder.nav != null ? toArray(builder.nav) : EMPTY_ARRAY;
      aside = builder.aside != null ? toArray(builder.aside) : EMPTY_ARRAY;
      footer = builder.footer != null ? toArray(builder.footer) : EMPTY_ARRAY;
      navlinks = builder.navlinks != null ? toArray(builder.navlinks) : EMPTY_ARRAY;
      asideFloat = builder.asideFloat;
      noResultsMessage = builder.noResultsMessage;
      nowrap = builder.nowrap;
      resolveBodyVars = builder.resolveBodyVars;
      template = builder.template;
      widgets = builder.widgets == null ? Collections.emptyList() : copyOf(builder.widgets);

      templateBean = newInstance(template);
      widgetMap = new HtmlWidgetMap();
      widgets.stream().map(this::newInstance).forEach(x -> widgetMap.append(x));
      widgetArray = Utils.array(widgetMap.values(), HtmlWidget.class);
   }

   @Override /* Context */
   public Builder copy() {
      return new Builder(this);
   }

   @Override /* Context */
   public HtmlDocSerializerSession.Builder createSession() {
      return HtmlDocSerializerSession.create(this);
   }

   @Override /* Context */
   public HtmlDocSerializerSession getSession() {
      return createSession().build();
   }

   @Override /* XmlSerializer */
   public HtmlSerializer getSchemaSerializer() {
      if (schemaSerializer == null)
         schemaSerializer = HtmlSchemaDocSerializer.create().beanContext(getBeanContext()).build();
      return schemaSerializer;
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Properties
   //-----------------------------------------------------------------------------------------------------------------

   /**
    * Aside section contents.
    *
    * @see Builder#aside(String...)
    * @return
    *    The overridden contents of the aside section on the HTML page.
    */
   protected final String[] getAside() {
      return aside;
   }

   /**
    * Float side section contents.
    *
    * @see Builder#asideFloat(AsideFloat)
    * @return
    *    How to float the aside contents on the page.
    */
   protected final AsideFloat getAsideFloat() {
      return asideFloat;
   }

   /**
    * Footer section contents.
    *
    * @see Builder#footer(String...)
    * @return
    *    The overridden contents of the footer section on the HTML page.
    */
   protected final String[] getFooter() {
      return footer;
   }

   /**
    * Additional head section content.
    *
    * @see Builder#head(String...)
    * @return
    *    HTML content to add to the head section of the HTML page.
    */
   protected final String[] getHead() {
      return head;
   }

   /**
    * Header section contents.
    *
    * @see Builder#header(String...)
    * @return
    *    The overridden contents of the header section on the HTML page.
    */
   protected final String[] getHeader() {
      return header;
   }

   /**
    * Nav section contents.
    *
    * @see Builder#nav(String...)
    * @return
    *    The overridden contents of the nav section on the HTML page.
    */
   protected final String[] getNav() {
      return nav;
   }

   /**
    * Page navigation links.
    *
    * @see Builder#navlinks(String...)
    * @return
    *    Navigation links to add to the HTML page.
    */
   protected final String[] getNavlinks() {
      return navlinks;
   }

   /**
    * No-results message.
    *
    * @see Builder#noResultsMessage(String)
    * @return
    *    The message used when serializing an empty array or empty list.
    */
   protected final String getNoResultsMessage() {
      return noResultsMessage;
   }

   /**
    * Prevent word wrap on page.
    *
    * @see Builder#nowrap()
    * @return
    *    <jk>true</jk> if <js>"* {white-space:nowrap}"</js> shoudl be added to the CSS instructions on the page to prevent word wrapping.
    */
   protected final boolean isNowrap() {
      return nowrap;
   }

   /**
    * Javascript code.
    *
    * @see Builder#script(String...)
    * @return
    *    Arbitrary Javascript to add to the HTML page.
    */
   protected final String[] getScript() {
      return script;
   }

   /**
    * CSS style code.
    *
    * @see Builder#style(String...)
    * @return
    *    The CSS instructions to add to the HTML page.
    */
   protected final String[] getStyle() {
      return style;
   }

   /**
    * Stylesheet import URLs.
    *
    * @see Builder#stylesheet(String...)
    * @return
    *    The link to the stylesheet of the HTML page.
    */
   protected final String[] getStylesheet() {
      return stylesheet;
   }

   /**
    * HTML document template.
    *
    * @see Builder#template(Class)
    * @return
    *    The template to use for serializing the page.
    */
   protected final HtmlDocTemplate getTemplate() {
      return templateBean;
   }

   /**
    * HTML widgets.
    *
    * @see Builder#widgets(Class...)
    * @return
    *    Widgets defined on this serializers.
    */
   protected final HtmlWidgetMap getWidgets() {
      return widgetMap;
   }

   /**
    * Performs an action on all widgets defined on this serializer.
    *
    * @param action The action to perform.
    * @return This object.
    */
   protected final HtmlDocSerializer forEachWidget(Consumer<HtmlWidget> action) {
      for (HtmlWidget w : widgetArray)
         action.accept(w);
      return this;
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Other methods
   //-----------------------------------------------------------------------------------------------------------------

   private String[] toArray(List<String> x) {
      return x.toArray(new String[x.size()]);
   }

   private <T> T newInstance(Class<T> c) {
      try {
         return c.getDeclaredConstructor().newInstance();
      } catch (Exception e) {
         throw asRuntimeException(e);
      }
   }

   @Override /* Context */
   protected JsonMap properties() {
      return filteredMap()
         .append("header", header)
         .append("nav", nav)
         .append("navlinks", navlinks)
         .append("aside", aside)
         .append("asideFloat", asideFloat)
         .append("footer", footer)
         .append("style", style)
         .append("head", head)
         .append("stylesheet", stylesheet)
         .append("nowrap", nowrap)
         .append("template", template)
         .append("noResultsMessage", noResultsMessage)
         .append("widgets", widgets);
   }
}