content: /*
   * Copyright (c) 2010, Zepheira LLC, Some rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 
   * - Redistributions of source code must retain the above copyright notice, this
   *   list of conditions and the following disclaimer.
   * - Redistributions in binary form must reproduce the above copyright notice,
   *   this list of conditions and the following disclaimer in the documentation
   *   and/or other materials provided with the distribution. 
   * - Neither the name of the openrdf.org nor the names of its contributors may
   *   be used to endorse or promote products derived from this software without
   *   specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   * 
   */
  package org.callimachusproject.xml;
  
  import java.io.Closeable;
  import java.io.IOException;
  
  import javax.xml.stream.XMLEventReader;
  import javax.xml.stream.XMLStreamException;
  import javax.xml.stream.events.XMLEvent;
  import javax.xml.stream.util.EventReaderDelegate;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Wraps an {@link XMLEventReader} and closes the stream when the XMLReader is
   * closed.
   * 
   * @author James Leigh
   * 
   */
  public class ClosingXMLEventReader extends EventReaderDelegate {
  	private final Logger logger = LoggerFactory
  			.getLogger(ClosingXMLEventReader.class);
  	private Closeable io;
  
  	public ClosingXMLEventReader(XMLEventReader reader, Closeable io) {
  		super(reader);
  		this.io = io;
  	}
  
  	public void close() throws XMLStreamException {
  		try {
  			super.close();
  		} finally {
  			try {
  				io.close();
  			} catch (IOException e) {
  				throw new XMLStreamException(e);
  			}
  		}
  	}
  
  	@Override
  	public XMLEvent nextEvent() throws XMLStreamException {
  		try {
  			return super.nextEvent();
  		} catch (XMLStreamException e) {
  			throw handle(e);
  		} catch (RuntimeException e) {
  			throw handle(e);
  		} catch (Error e) {
  			throw handle(e);
  		}
  	}
  
  	@Override
  	public Object next() {
  		try {
  			return super.next();
  		} catch (RuntimeException e) {
  			throw handle(e);
  		} catch (Error e) {
  			throw handle(e);
  		}
  	}
  
  	@Override
  	public boolean hasNext() {
  		try {
  			return super.hasNext();
  		} catch (RuntimeException e) {
  			throw handle(e);
  		} catch (Error e) {
  			throw handle(e);
  		}
  	}
  
  	@Override
  	public XMLEvent peek() throws XMLStreamException {
  		try {
  			return super.peek();
  		} catch (XMLStreamException e) {
  			throw handle(e);
  		} catch (RuntimeException e) {
  			throw handle(e);
  		} catch (Error e) {
  			throw handle(e);
  		}
  	}
  
  	@Override
  	public String getElementText() throws XMLStreamException {
  		try {
  			return super.getElementText();
  		} catch (XMLStreamException e) {
  			throw handle(e);
  		} catch (RuntimeException e) {
  			throw handle(e);
  		} catch (Error e) {
  			throw handle(e);
  		}
  	}
  
  	@Override
  	public XMLEvent nextTag() throws XMLStreamException {
  		try {
  			return super.nextTag();
  		} catch (XMLStreamException e) {
  			throw handle(e);
  		} catch (RuntimeException e) {
  			throw handle(e);
  		} catch (Error e) {
  			throw handle(e);
  		}
  	}
  
  	@Override
  	public void remove() {
  		try {
  			super.remove();
  		} catch (RuntimeException e) {
  			throw handle(e);
  		} catch (Error e) {
  			throw handle(e);
  		}
  	}
  
  	private <E extends Throwable> E handle(E exc) {
  		try {
  			close();
  		} catch (Exception e) {
  			logger.error(e.toString(), e);
  		}
  		return exc;
  	}
  
  }
  