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package com.sun.tools.xjc.util;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;

/**
 * ContentHandler that "forks" the incoming SAX2 events to
 * two ContentHandlers.
 *
 *
 * @author  <a href="mailto:kohsuke.kawaguchi@sun.com">Kohsuke KAWAGUCHI</a>
 */
public class ForkContentHandler implements ContentHandler {

	/**
	 * Creates a ForkContentHandler.
	 *
	 * @param first
	 *     This handler will receive a SAX event first.
	 * @param second
	 *     This handler will receive a SAX event after the first handler
	 *     receives it.
	 */
	public ForkContentHandler( ContentHandler first, ContentHandler second ) {
		lhs = first;
		rhs = second;
	}

	/**
	 * Creates ForkContentHandlers so that the specified handlers
	 * will receive SAX events in the order of the array.
	 */
	public static ContentHandler create( ContentHandler[] handlers ) {
		if(handlers.length==0)
			throw new IllegalArgumentException();

		ContentHandler result = handlers[0];
		for( int i=1; i<handlers.length; i++ )
			result = new ForkContentHandler( result, handlers[i] );
		return result;
	}


	private final ContentHandler lhs,rhs;

	public void setDocumentLocator (Locator locator) {
		lhs.setDocumentLocator(locator);
		rhs.setDocumentLocator(locator);
	}

	public void startDocument() throws SAXException {
		lhs.startDocument();
		rhs.startDocument();
	}

	public void endDocument () throws SAXException {
		lhs.endDocument();
		rhs.endDocument();
	}

	public void startPrefixMapping (String prefix, String uri) throws SAXException {
		lhs.startPrefixMapping(prefix,uri);
		rhs.startPrefixMapping(prefix,uri);
	}

	public void endPrefixMapping (String prefix) throws SAXException {
		lhs.endPrefixMapping(prefix);
		rhs.endPrefixMapping(prefix);
	}

	public void startElement (String uri, String localName, String qName, Attributes attributes) throws SAXException {
		lhs.startElement(uri,localName,qName,attributes);
		rhs.startElement(uri,localName,qName,attributes);
	}

	public void endElement (String uri, String localName, String qName) throws SAXException {
		lhs.endElement(uri,localName,qName);
		rhs.endElement(uri,localName,qName);
	}

	public void characters (char ch[], int start, int length) throws SAXException {
		lhs.characters(ch,start,length);
		rhs.characters(ch,start,length);
	}

	public void ignorableWhitespace (char ch[], int start, int length) throws SAXException {
		lhs.ignorableWhitespace(ch,start,length);
		rhs.ignorableWhitespace(ch,start,length);
	}

	public void processingInstruction (String target, String data) throws SAXException {
		lhs.processingInstruction(target,data);
		rhs.processingInstruction(target,data);
	}

	public void skippedEntity (String name) throws SAXException {
		lhs.skippedEntity(name);
		rhs.skippedEntity(name);
	}

}