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/*
 * Copyright 2003, 2004  The Apache Software Foundation
 * 
 * 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.xmlrpc.serializer;

import java.io.OutputStream;
import java.io.StringWriter;

import org.apache.ws.commons.serialize.CharSetXMLWriter;
import org.apache.xmlrpc.XmlRpcException;
import org.apache.xmlrpc.common.XmlRpcStreamConfig;
import org.xml.sax.ContentHandler;
import org.xml.sax.helpers.AttributesImpl;


/** The default implementation of {@link org.apache.xmlrpc.serializer.XmlWriterFactory}
 * tests, whether the {@link org.apache.xmlrpc.serializer.CharSetXmlWriterFactory}
 * is usable. This is the case, when running in Java 1.4 or later. If so,
 * this factory is used. Otherwise, the
 * {@link org.apache.xmlrpc.serializer.BaseXmlWriterFactory} is used as a
 * fallback.
 */
public class DefaultXMLWriterFactory implements XmlWriterFactory {
	private final XmlWriterFactory factory;

	/** Creates a new instance.
	 */
	public DefaultXMLWriterFactory() {
		XmlWriterFactory xwf;
		try {
			CharSetXMLWriter csw = new CharSetXMLWriter();
			StringWriter sw = new StringWriter();
			csw.setWriter(sw);
			csw.startDocument();
			csw.startElement("", "test", "test", new AttributesImpl());
			csw.endElement("", "test", "test");
			csw.endDocument();
			xwf = new CharSetXmlWriterFactory();
		} catch (Throwable t) {
			xwf = new BaseXmlWriterFactory();
		}
		factory = xwf;
	}

	public ContentHandler getXmlWriter(XmlRpcStreamConfig pConfig,
									   OutputStream pStream) throws XmlRpcException {
		return factory.getXmlWriter(pConfig, pStream);
	}
}