/*
 * Copyright 2004,2005 The Apache Software Foundation.
 * Copyright 2006 International Business Machines Corp.
 *
 * Licensed 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.axis2.jaxws.message.databinding.impl;

import java.io.StringReader;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.apache.axiom.om.OMElement;
import org.apache.axis2.jaxws.message.databinding.XMLStringBlock;
import org.apache.axis2.jaxws.message.factory.BlockFactory;
import org.apache.axis2.jaxws.message.impl.BlockImpl;
import org.apache.axis2.jaxws.message.util.Reader2Writer;

/**
 * XMLStringBlock
 * 
 * Block containing a business object that is a String of xml text
 */
public class XMLStringBlockImpl extends BlockImpl implements XMLStringBlock {

	protected static XMLInputFactory inputFactory = XMLInputFactory.newInstance();
	protected static XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
	
	/**
	 * Constructor called from factory
	 * @param busObject
	 * @param qName
	 * @param factory
	 */
	XMLStringBlockImpl(String busObject, QName qName, BlockFactory factory) {
		super(busObject, null, qName, factory);
	}
	

	/**
	 * Constructor called from factory
	 * @param reader
	 * @param qName
	 * @param factory
	 */
	public XMLStringBlockImpl(OMElement omElement, QName qName, BlockFactory factory) {
		super(omElement, null, qName, factory);
	}

	@Override
	protected Object _getBOFromReader(XMLStreamReader reader, Object busContext) throws XMLStreamException {
		// Create a Reader2Writer converter and get the output as a String
		Reader2Writer r2w = new Reader2Writer(reader);
		return r2w.getAsString();
	}

	@Override
	protected XMLStreamReader _getReaderFromBO(Object busObj, Object busContext) throws XMLStreamException {
		// Create an XMLStreamReader from the inputFactory using the String as the sources
		String str = (String) busObj;
		StringReader sr = new StringReader(str);
		return inputFactory.createXMLStreamReader(sr);
	}

	@Override
	protected void _outputFromBO(Object busObject, Object busContext, XMLStreamWriter writer) throws XMLStreamException {
		// There is no fast way to output the String to a writer, so get the reader
		// and pass use the default reader->writer.
		XMLStreamReader reader = _getReaderFromBO(busObject, busContext);
		_outputFromReader(reader, writer);
	}
}