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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* $Id$ */
package org.apache.fop.util;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
import org.apache.xmlgraphics.util.QName;
/**
* This class is a delegating SAX ContentHandler which has the purpose to provide a few handy
* methods that make life easier when generating SAX events.
*/
public class GenerationHelperContentHandler extends DelegatingContentHandler {
private static final Attributes EMPTY_ATTS = new AttributesImpl();
private String mainNamespace;
private Object contentHandlerContext;
/**
* Main constructor. If the given handler also implements any of the EntityResolver,
* DTDHandler, LexicalHandler or ErrorHandler interfaces, these are set automatically.
* @param handler the SAX content handler to delegate all calls to
* @param mainNamespace the main namespace used for generated XML content when abbreviated
* ContentHandler calls are used.
* @param contentHandlerContext additional content handler context state
*/
public GenerationHelperContentHandler(ContentHandler handler, String mainNamespace, Object contentHandlerContext) {
super(handler);
this.mainNamespace = mainNamespace;
this.contentHandlerContext = contentHandlerContext;
}
/**
* Returns the main namespace used for generated XML content.
* @return the main namespace
*/
public String getMainNamespace() {
return this.mainNamespace;
}
/**
* Sets the main namespace used for generated XML content when abbreviated ContentHandler
* calls are used.
* @param namespaceURI the new main namespace URI
*/
public void setMainNamespace(String namespaceURI) {
this.mainNamespace = namespaceURI;
}
/**
* Returns the context object (may be null).
* @return the context object
*/
public Object getContentHandlerContext() {
return this.contentHandlerContext;
}
/**
* Convenience method to generate a startElement SAX event.
* @param localName the local name of the element
* @param atts the attributes
* @throws SAXException if a SAX exception occurs
*/
public void startElement(String localName, Attributes atts) throws SAXException {
getDelegateContentHandler().startElement(getMainNamespace(), localName, localName, atts);
}
/**
* Convenience method to generate a startElement SAX event.
* @param localName the local name of the element
* @throws SAXException if a SAX exception occurs
*/
public void startElement(String localName) throws SAXException {
startElement(localName, EMPTY_ATTS);
}
/**
* Convenience method to generate a startElement SAX event.
* @param qName the qualified name of the element
* @param atts the attributes
* @throws SAXException if a SAX exception occurs
*/
public void startElement(QName qName, Attributes atts) throws SAXException {
getDelegateContentHandler().startElement(qName.getNamespaceURI(), qName.getLocalName(),
qName.getQName(), atts);
}
/**
* Convenience method to generate a startElement SAX event.
* @param qName the qualified name of the element
* @throws SAXException if a SAX exception occurs
*/
public void startElement(QName qName) throws SAXException {
startElement(qName, EMPTY_ATTS);
}
/**
* Convenience method to generate a endElement SAX event.
* @param localName the local name of the element
* @throws SAXException if a SAX exception occurs
*/
public void endElement(String localName) throws SAXException {
getDelegateContentHandler().endElement(getMainNamespace(), localName, localName);
}
/**
* Convenience method to generate a startElement SAX event.
* @param qName the qualified name of the element
* @throws SAXException if a SAX exception occurs
*/
public void endElement(QName qName) throws SAXException {
getDelegateContentHandler().endElement(qName.getNamespaceURI(), qName.getLocalName(),
qName.getQName());
}
/**
* Convenience method to generate an empty element with attributes.
* @param localName the local name of the element
* @param atts the attributes
* @throws SAXException if a SAX exception occurs
*/
public void element(String localName, Attributes atts) throws SAXException {
getDelegateContentHandler().startElement(getMainNamespace(), localName, localName, atts);
getDelegateContentHandler().endElement(getMainNamespace(), localName, localName);
}
/**
* Convenience method to generate an empty element with attributes.
* @param qName the qualified name of the element
* @param atts the attributes
* @throws SAXException if a SAX exception occurs
*/
public void element(QName qName, Attributes atts) throws SAXException {
getDelegateContentHandler().startElement(qName.getNamespaceURI(), qName.getLocalName(),
qName.getQName(), atts);
getDelegateContentHandler().endElement(qName.getNamespaceURI(), qName.getLocalName(),
qName.getQName());
}
}
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