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/*
* Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT.  See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
*   Free Software Foundation, Inc.
*   59 Temple Place, Suite 330
*   Boston, MA 02111-1307  USA
*
* @author Emil Ong
*/

package com.caucho.xml.stream;

import com.caucho.util.L10N;
import com.caucho.xml.stream.events.*;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLEventReader;
import static javax.xml.stream.XMLStreamConstants.*;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.events.*;
import javax.xml.stream.util.XMLEventAllocator;

import java.util.HashMap;

public class XMLEventReaderImpl implements XMLEventReader {
  public static final L10N L = new L10N(XMLEventReaderImpl.class);

  private final XMLEventAllocator _allocator;
  private final XMLStreamReader _in;
  private XMLEvent _current = null;
  private XMLEvent _next = null;

  public XMLEventReaderImpl(XMLEventAllocator allocator, XMLStreamReader in)
    throws XMLStreamException
  {
    _in = in;
    _allocator = allocator;
    _next = _allocator.allocate(_in);
  }

  public XMLStreamReader getXMLStreamReader()
  {
    return _in;
  }

  public void close() 
    throws XMLStreamException
  {
    _in.close();
  }

  public String getElementText() 
    throws XMLStreamException
  {
    return _in.getElementText();
  }

  public Object getProperty(String name) 
    throws IllegalArgumentException
  {
    throw new IllegalArgumentException(name);
  }

  public boolean hasNext()
  {
    try {
      return _next != null || _in.hasNext();
    } 
    catch (XMLStreamException e) {
      return false;
    }
  }

  public XMLEvent nextEvent() throws XMLStreamException
  {
    if (_next != null) {
      _current = _next;
      _next = null;
    }
    else {
      _in.next();
      _current = _allocator.allocate(_in);
    }

    return _current;
  }

  public XMLEvent nextTag() throws XMLStreamException
  {
    if (_next != null) {
      _current = _next;
      _next = null;
    }
    else {
      _in.nextTag();
      _current = _allocator.allocate(_in);
    }

    return _current;
  }

  public XMLEvent peek() throws XMLStreamException
  {
    if (_next == null) {
      _in.next();
      _next = _allocator.allocate(_in);
    }

    return _next;
  }

  public void remove()
  {
    throw new UnsupportedOperationException();
  }

  public XMLEvent next()
  {
    try {
      return nextEvent();
    }
    catch (XMLStreamException e) {
      return null;
    }
  }
}