/*
 * 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.xml;

import static org.apache.juneau.common.utils.ThrowableUtils.*;

import java.io.*;

import javax.xml.namespace.*;
import javax.xml.stream.*;
import javax.xml.stream.util.*;

import org.apache.juneau.parser.*;

/**
 * Wrapper class around a {@link XMLStreamReader}.
 *
 * <p>
 * The purpose is to encapsulate the reader with the {@link ParserPipe} object so that it can be retrieved for
 * debugging purposes.
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/XmlBasics">XML Basics</a>
 * </ul>
 */
public class XmlReader implements XMLStreamReader, Positionable {

   private final ParserPipe pipe;
   private final XMLStreamReader sr;

   /**
    * Constructor.
    *
    * @param pipe The parser input.
    * @param validating The value for the {@link XMLInputFactory#IS_VALIDATING} setting.
    * @param reporter The value for the {@link XMLInputFactory#REPORTER} setting.
    * @param resolver The value for the {@link XMLInputFactory#RESOLVER} setting.
    * @param eventAllocator The value for the {@link XMLInputFactory#ALLOCATOR} setting.
    * @throws IOException Thrown by underling
    * @throws XMLStreamException Thrown by underlying XML stream.
    */
   protected XmlReader(ParserPipe pipe, boolean validating, XMLReporter reporter, XMLResolver resolver, XMLEventAllocator eventAllocator) throws IOException, XMLStreamException {
      this.pipe = pipe;
      try {
         @SuppressWarnings("resource")
         Reader r = pipe.getBufferedReader();
         XMLInputFactory factory = XMLInputFactory.newInstance();
         factory.setProperty(XMLInputFactory.IS_VALIDATING, validating);
         factory.setProperty(XMLInputFactory.IS_COALESCING, true);
         factory.setProperty(XMLInputFactory.IS_REPLACING_ENTITY_REFERENCES, false);
         factory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
         if (factory.isPropertySupported(XMLInputFactory.REPORTER) && reporter != null)
            factory.setProperty(XMLInputFactory.REPORTER, reporter);
         if (factory.isPropertySupported(XMLInputFactory.RESOLVER) && resolver != null)
            factory.setProperty(XMLInputFactory.RESOLVER, resolver);
         if (factory.isPropertySupported(XMLInputFactory.ALLOCATOR) && eventAllocator != null)
            factory.setProperty(XMLInputFactory.ALLOCATOR, eventAllocator);
         sr = factory.createXMLStreamReader(r);
         sr.nextTag();
         pipe.setPositionable(this);
      } catch (Error e) {
         throw cast(IOException.class, e);
      }
   }

   /**
    * Returns the pipe passed into the constructor.
    *
    * @return The pipe passed into the constructor.
    */
   public ParserPipe getPipe() {
      return pipe;
   }

   @Override /* XMLStreamReader */
   public void close() throws XMLStreamException {
      sr.close();
   }

   @Override /* XMLStreamReader */
   public int getAttributeCount() {
      return sr.getAttributeCount();
   }

   @Override /* XMLStreamReader */
   public String getAttributeLocalName(int index) {
      return sr.getAttributeLocalName(index);
   }

   @Override /* XMLStreamReader */
   public QName getAttributeName(int index) {
      return sr.getAttributeName(index);
   }

   @Override /* XMLStreamReader */
   public String getAttributeNamespace(int index) {
      return sr.getAttributeNamespace(index);
   }

   @Override /* XMLStreamReader */
   public String getAttributePrefix(int index) {
      return sr.getAttributePrefix(index);
   }

   @Override /* XMLStreamReader */
   public String getAttributeType(int index) {
      return sr.getAttributeType(index);
   }

   @Override /* XMLStreamReader */
   public String getAttributeValue(int index) {
      return sr.getAttributeValue(index);
   }

   @Override /* XMLStreamReader */
   public String getAttributeValue(String namespaceURI, String localName) {
      return sr.getAttributeValue(namespaceURI, localName);
   }

   @Override /* XMLStreamReader */
   public String getCharacterEncodingScheme() {
      return sr.getCharacterEncodingScheme();
   }

   @Override /* XMLStreamReader */
   public String getElementText() throws XMLStreamException {
      return sr.getElementText();
   }

   @Override /* XMLStreamReader */
   public String getEncoding() {
      return sr.getEncoding();
   }

   @Override /* XMLStreamReader */
   public int getEventType() {
      return sr.getEventType();
   }

   @Override /* XMLStreamReader */
   public String getLocalName() {
      return sr.getLocalName();
   }

   @Override /* XMLStreamReader */
   public Location getLocation() {
      return sr.getLocation();
   }

   @Override /* XMLStreamReader */
   public QName getName() {
      return sr.getName();
   }

   @Override /* XMLStreamReader */
   public NamespaceContext getNamespaceContext() {
      return sr.getNamespaceContext();
   }

   @Override /* XMLStreamReader */
   public int getNamespaceCount() {
      return sr.getNamespaceCount();
   }

   @Override /* XMLStreamReader */
   public String getNamespacePrefix(int index) {
      return sr.getNamespacePrefix(index);
   }

   @Override /* XMLStreamReader */
   public String getNamespaceURI() {
      return sr.getNamespaceURI();
   }

   @Override /* XMLStreamReader */
   public String getNamespaceURI(String prefix) {
      return sr.getNamespaceURI(prefix);
   }

   @Override /* XMLStreamReader */
   public String getNamespaceURI(int index) {
      return sr.getNamespaceURI(index);
   }

   @Override /* XMLStreamReader */
   public String getPIData() {
      return sr.getPIData();
   }

   @Override /* XMLStreamReader */
   public String getPITarget() {
      return sr.getPITarget();
   }

   @Override /* XMLStreamReader */
   public String getPrefix() {
      return sr.getPrefix();
   }

   @Override /* XMLStreamReader */
   public Object getProperty(String name) throws IllegalArgumentException {
      return sr.getProperty(name);
   }

   @Override /* XMLStreamReader */
   public String getText() {
      return sr.getText();
   }

   @Override /* XMLStreamReader */
   public char[] getTextCharacters() {
      return sr.getTextCharacters();
   }

   @Override /* XMLStreamReader */
   public int getTextCharacters(int sourceStart, char[] target, int targetStart, int length) throws XMLStreamException {
      return sr.getTextCharacters(sourceStart, target, targetStart, length);
   }

   @Override /* XMLStreamReader */
   public int getTextLength() {
      return sr.getTextLength();
   }

   @Override /* XMLStreamReader */
   public int getTextStart() {
      return sr.getTextStart();
   }

   @Override /* XMLStreamReader */
   public String getVersion() {
      return sr.getVersion();
   }

   @Override /* XMLStreamReader */
   public boolean hasName() {
      return sr.hasName();
   }

   @Override /* XMLStreamReader */
   public boolean hasNext() throws XMLStreamException {
      return sr.hasNext();
   }

   @Override /* XMLStreamReader */
   public boolean hasText() {
      return sr.hasText();
   }

   @Override /* XMLStreamReader */
   public boolean isAttributeSpecified(int index) {
      return sr.isAttributeSpecified(index);
   }

   @Override /* XMLStreamReader */
   public boolean isCharacters() {
      return sr.isCharacters();
   }

   @Override /* XMLStreamReader */
   public boolean isEndElement() {
      return sr.isEndElement();
   }

   @Override /* XMLStreamReader */
   public boolean isStandalone() {
      return sr.isStandalone();
   }

   @Override /* XMLStreamReader */
   public boolean isStartElement() {
      return sr.isStartElement();
   }

   @Override /* XMLStreamReader */
   public boolean isWhiteSpace() {
      return sr.isWhiteSpace();
   }

   @Override /* XMLStreamReader */
   public int next() throws XMLStreamException {
      return sr.next();
   }

   @Override /* XMLStreamReader */
   public int nextTag() throws XMLStreamException {
      return sr.nextTag();
   }

   @Override /* XMLStreamReader */
   public void require(int type, String namespaceURI, String localName) throws XMLStreamException {
      sr.require(type, namespaceURI, localName);
   }

   @Override /* XMLStreamReader */
   public boolean standaloneSet() {
      return sr.standaloneSet();
   }

   @Override /* Positionable */
   public Position getPosition() {
      Location l = getLocation();
      return new Position(l.getLineNumber(), l.getColumnNumber());
   }
}