/*
    * 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;
  
  import static org.apache.juneau.commons.utils.Utils.*;
  
  import java.lang.annotation.*;
  import java.util.*;
  
  import org.apache.juneau.commons.collections.*;
  import org.apache.juneau.commons.function.*;
  import org.apache.juneau.commons.reflect.*;
  
  /**
   * Parent class for all classes that traverse POJOs.
   *
   * <h5 class='topic'>Description</h5>
   * <p>
   * Base class that serves as the parent class for all serializers and other classes that traverse POJOs.
   *
   * <h5 class='section'>Notes:</h5><ul>
   * 	<li class='note'>This class is thread safe and reusable.
   * </ul>
   *
   */
  public abstract class BeanTraverseContext extends BeanContextable {
  	/**
  	 * Builder class.
  	 */
  	public abstract static class Builder extends BeanContextable.Builder {
  
  		private boolean detectRecursions;
  		private boolean ignoreRecursions;
  		private int initialDepth;
  		private int maxDepth;
  
  		/**
  		 * Constructor, default settings.
  		 */
  		protected Builder() {
  			detectRecursions = env("BeanTraverseContext.detectRecursions", false);
  			ignoreRecursions = env("BeanTraverseContext.ignoreRecursions", false);
  			initialDepth = env("BeanTraverseContext.initialDepth", 0);
  			maxDepth = env("BeanTraverseContext.maxDepth", 100);
  		}
  
  		/**
  		 * Copy constructor.
  		 *
  		 * @param copyFrom The bean to copy from.
  		 */
  		protected Builder(BeanTraverseContext copyFrom) {
  			super(copyFrom);
  			detectRecursions = copyFrom.getDetectRecursions();
  			ignoreRecursions = copyFrom.getIgnoreRecursions();
  			initialDepth = copyFrom.getInitialDepth();
  			maxDepth = copyFrom.getMaxDepth();
  		}
  
  		/**
  		 * Copy constructor.
  		 *
  		 * @param copyFrom The builder to copy from.
  		 */
  		protected Builder(Builder copyFrom) {
  			super(copyFrom);
  			detectRecursions = copyFrom.detectRecursions;
  			ignoreRecursions = copyFrom.ignoreRecursions;
  			initialDepth = copyFrom.initialDepth;
  			maxDepth = copyFrom.maxDepth;
  		}
  
  		@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(Class<?>...from) {
 			super.applyAnnotations(from);
 			return this;
 		}
 
 		@Override /* Overridden from Builder */
 		public Builder applyAnnotations(Object...from) {
 			super.applyAnnotations(from);
 			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(Class<?> beanClass, String properties) {
 			super.beanProperties(beanClass, properties);
 			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(String beanClassName, String properties) {
 			super.beanProperties(beanClassName, properties);
 			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(Map<String,Object> values) {
 			super.beanPropertiesExcludes(values);
 			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(Class<?> beanClass, String properties) {
 			super.beanPropertiesReadOnly(beanClass, 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(String beanClassName, String properties) {
 			super.beanPropertiesReadOnly(beanClassName, properties);
 			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(Map<String,Object> values) {
 			super.beanPropertiesWriteOnly(values);
 			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 cache(Cache<HashKey,? extends org.apache.juneau.Context> value) {
 			super.cache(value);
 			return this;
 		}
 
 		@Override /* Overridden from Context.Builder */
 		public abstract Builder copy();
 
 		@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;
 		}
 
 		/**
 		 * Automatically detect POJO recursions.
 		 *
 		 * <p>
 		 * When enabled, specifies that recursions should be checked for during traversal.
 		 *
 		 * <p>
 		 * Recursions can occur when traversing models that aren't true trees but rather contain loops.
 		 * <br>In general, unchecked recursions cause stack-overflow-errors.
 		 * <br>These show up as {@link BeanRecursionException BeanRecursionException} with the message <js>"Depth too deep.  Stack overflow occurred."</js>.
 		 *
 		 * <h5 class='section'>Notes:</h5><ul>
 		 * 	<li class='note'>
 		 * 		Checking for recursion can cause a small performance penalty.
 		 * </ul>
 		 *
 		 * <h5 class='section'>Example:</h5>
 		 * <p class='bjava'>
 		 * 	<jc>// Create a serializer that automatically checks for recursions.</jc>
 		 * 	WriterSerializer <jv>serializer</jv> = JsonSerializer
 		 * 		.<jsm>create</jsm>()
 		 * 		.detectRecursions()
 		 * 		.build();
 		 *
 		 * 	<jc>// Create a POJO model with a recursive loop.</jc>
 		 * 	<jk>public class</jk> MyBean {
 		 * 		<jk>public</jk> Object <jf>f</jf>;
 		 * 	}
 		 * 	MyBean <jv>bean</jv> = <jk>new</jk> MyBean();
 		 * 	<jv>bean</jv>.<jf>f</jf> = <jv>bean</jv>;
 		 *
 		 * 	<jc>// Throws a SerializeException and not a StackOverflowError</jc>
 		 * 	String <jv>json</jv> = <jv>serializer</jv>.serialize(<jv>bean</jv>);
 		 * </p>
 		 *
 		 * @return This object.
 		 */
 		public Builder detectRecursions() {
 			return detectRecursions(true);
 		}
 
 		/**
 		 * Same as {@link #detectRecursions()} but allows you to explicitly specify the value.
 		 *
 		 * @param value The value for this setting.
 		 * @return This object.
 		 */
 		public Builder detectRecursions(boolean value) {
 			detectRecursions = value;
 			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, String json) {
 			super.example(pojoClass, json);
 			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 Builder findFluentSetters() {
 			super.findFluentSetters();
 			return this;
 		}
 
 		@Override /* Overridden from Builder */
 		public Builder findFluentSetters(Class<?> on) {
 			super.findFluentSetters(on);
 			return this;
 		}
 
 		@Override /* Overridden from Context.Builder */
 		public HashKey hashKey() {
 			// @formatter:off
 			return HashKey.of(
 				super.hashKey(),
 				detectRecursions,
 				ignoreRecursions,
 				initialDepth,
 				maxDepth
 			);
 			// @formatter:on
 		}
 
 		@Override /* Overridden from Builder */
 		public Builder ignoreInvocationExceptionsOnGetters() {
 			super.ignoreInvocationExceptionsOnGetters();
 			return this;
 		}
 
 		@Override /* Overridden from Builder */
 		public Builder ignoreInvocationExceptionsOnSetters() {
 			super.ignoreInvocationExceptionsOnSetters();
 			return this;
 		}
 
 		/**
 		 * Ignore recursion errors.
 		 *
 		 * <p>
 		 * When enabled, when we encounter the same object when traversing a tree, we set the value to <jk>null</jk>.
 		 *
 		 * <p>
 		 * For example, if a model contains the links A-&gt;B-&gt;C-&gt;A, then the JSON generated will look like
 		 * 	the following when this setting is <jk>true</jk>...
 		 *
 		 * <p class='bjson'>
 		 * 	{A:{B:{C:<jk>null</jk>}}}
 		 * </p>
 		 *
 		 * <h5 class='section'>Notes:</h5><ul>
 		 * 	<li class='note'>
 		 * 		Checking for recursion can cause a small performance penalty.
 		 * </ul>
 		 *
 		 * <h5 class='section'>Example:</h5>
 		 * <p class='bjava'>
 		 * 	<jc>// Create a serializer ignores recursions.</jc>
 		 * 	WriterSerializer <jv>serializer</jv> = JsonSerializer
 		 * 		.<jsm>create</jsm>()
 		 * 		.ignoreRecursions()
 		 * 		.build();
 		 *
 		 * 	<jc>// Create a POJO model with a recursive loop.</jc>
 		 * 	<jk>public class</jk> MyBean {
 		 * 		<jk>public</jk> Object <jf>f</jf>;
 		 * 	}
 		 * 	MyBean <jv>bean</jv> = <jk>new</jk> MyBean();
 		 * 	<jv>bean</jv>.<jf>f</jf> = <jv>bean</jv>;
 		 *
 		 * 	<jc>// Produces "{f:null}"</jc>
 		 * 	String <jv>json</jv> = <jv>serializer</jv>.serialize(<jv>bean</jv>);
 		 * </p>
 		 *
 		 * @return This object.
 		 */
 		public Builder ignoreRecursions() {
 			return ignoreRecursions(true);
 		}
 
 		/**
 		 * Same as {@link #ignoreRecursions()} but allows you to explicitly specify the value.
 		 *
 		 * @param value The value for this setting.
 		 * @return This object.
 		 */
 		public Builder ignoreRecursions(boolean value) {
 			ignoreRecursions = value;
 			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 impl(Context value) {
 			super.impl(value);
 			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;
 		}
 
 		/**
 		 * Initial depth.
 		 *
 		 * <p>
 		 * The initial indentation level at the root.
 		 *
 		 * <p>
 		 * Useful when constructing document fragments that need to be indented at a certain level when whitespace is enabled.
 		 *
 		 * <h5 class='section'>Example:</h5>
 		 * <p class='bjava'>
 		 * 	<jc>// Create a serializer with whitespace enabled and an initial depth of 2.</jc>
 		 * 	WriterSerializer <jv>serializer</jv> = JsonSerializer
 		 * 		.<jsm>create</jsm>()
 		 * 		.ws()
 		 * 		.initialDepth(2)
 		 * 		.build();
 		 *
 		 * 	<jc>// Produces "\t\t{\n\t\t\t'foo':'bar'\n\t\t}\n"</jc>
 		 * 	String <jv>json</jv> = <jv>serializer</jv>.serialize(<jk>new</jk> MyBean());
 		 * </p>
 		 *
 		 * @param value
 		 * 	The new value for this setting.
 		 * 	<br>The default is <c>0</c>.
 		 * @return This object.
 		 */
 		public Builder initialDepth(int value) {
 			initialDepth = value;
 			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;
 		}
 
 		/**
 		 * Max traversal depth.
 		 *
 		 * <p>
 		 * When enabled, abort traversal if specified depth is reached in the POJO tree.
 		 *
 		 * <p>
 		 * If this depth is exceeded, an exception is thrown.
 		 *
 		 * <p>
 		 * This prevents stack overflows from occurring when trying to traverse models with recursive references.
 		 *
 		 * <h5 class='section'>Example:</h5>
 		 * <p class='bjava'>
 		 * 	<jc>// Create a serializer that throws an exception if the depth reaches greater than 20.</jc>
 		 * 	WriterSerializer <jv>serializer</jv> = JsonSerializer
 		 * 		.<jsm>create</jsm>()
 		 * 		.maxDepth(20)
 		 * 		.build();
 		 * </p>
 		 *
 		 * <h5 class='section'>See Also:</h5><ul>
 		 * 	<li class='jm'>{@link Builder#maxDepth(int)}
 		 * </ul>
 		 *
 		 * @param value
 		 * 	The new value for this setting.
 		 * 	<br>The default is <c>100</c>.
 		 * @return This object.
 		 */
 		public Builder maxDepth(int value) {
 			maxDepth = 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<?> on, Class<? extends org.apache.juneau.PropertyNamer> value) {
 			super.propertyNamer(on, value);
 			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 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(Class<?>...values) {
 			super.swaps(values);
 			return this;
 		}
 
 		@Override /* Overridden from Builder */
 		public Builder swaps(Object...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 type(Class<? extends org.apache.juneau.Context> value) {
 			super.type(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(Class<?> on, String value) {
 			super.typePropertyName(on, value);
 			return this;
 		}
 
 		@Override /* Overridden from Builder */
 		public Builder typePropertyName(String value) {
 			super.typePropertyName(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;
 		}
 	}
 
 	private final boolean detectRecursions;
 	private final boolean ignoreRecursions;
 	private final int initialDepth;
 	private final int maxDepth;
 	private final boolean actualDetectRecursions;
 
 	/**
 	 * Constructor
 	 *
 	 * @param builder The builder for this object.
 	 */
 	protected BeanTraverseContext(Builder builder) {
 		super(builder);
 
 		detectRecursions = builder.detectRecursions;
 		ignoreRecursions = builder.ignoreRecursions;
 		initialDepth = builder.initialDepth;
 		maxDepth = builder.maxDepth;
 
 		actualDetectRecursions = detectRecursions || ignoreRecursions || super.isDebug();
 	}
 
 	@Override /* Overridden from Context */
 	public abstract Builder copy();
 
 	/**
 	 * Initial depth.
 	 *
 	 * @see Builder#initialDepth(int)
 	 * @return
 	 * 	The initial indentation level at the root.
 	 */
 	public final int getInitialDepth() { return initialDepth; }
 
 	/**
 	 * Max traversal depth.
 	 *
 	 * @see Builder#maxDepth(int)
 	 * @return
 	 * 	The depth at which traversal is aborted if depth is reached in the POJO tree.
 	 *	<br>If this depth is exceeded, an exception is thrown.
 	 */
 	public final int getMaxDepth() { return maxDepth; }
 
 	/**
 	 * Automatically detect POJO recursions.
 	 *
 	 * @see Builder#detectRecursions()
 	 * @return
 	 * 	<jk>true</jk> if recursions should be checked for during traversal.
 	 */
 	public final boolean isDetectRecursions() { return actualDetectRecursions; }
 
 	/**
 	 * Ignore recursion errors.
 	 *
 	 * @see Builder#ignoreRecursions()
 	 * @return
 	 * 	<jk>true</jk> if when we encounter the same object when traversing a tree, we set the value to <jk>null</jk>.
 	 * 	<br>Otherwise, an exception is thrown with the message <js>"Recursion occurred, stack=..."</js>.
 	 */
 	public final boolean isIgnoreRecursions() { return ignoreRecursions; }
 
 	/**
 	 * Detect recursions flag (raw value).
 	 *
 	 * @return The detect recursions flag.
 	 */
 	protected final boolean getDetectRecursions() { return detectRecursions; }
 
 	/**
 	 * Ignore recursions flag (raw value).
 	 *
 	 * @return The ignore recursions flag.
 	 */
 	protected final boolean getIgnoreRecursions() { return ignoreRecursions; }
 
 	@Override /* Overridden from BeanContextable */
 	protected FluentMap<String,Object> properties() {
 		return super.properties()
 			.a("detectRecursions", detectRecursions)
 			.a("ignoreRecursions", ignoreRecursions)
 			.a("initialDepth", initialDepth)
 			.a("maxDepth", maxDepth);
 	}
 }