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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.render.ps.extensions;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.util.ContentHandlerFactory;
import org.apache.fop.util.ContentHandlerFactory.ObjectBuiltListener;
/**
* ContentHandler (parser) for restoring PSExtension objects from XML.
*/
public class PSExtensionHandler extends DefaultHandler
implements ContentHandlerFactory.ObjectSource {
/** Logger instance */
protected static Log log = LogFactory.getLog(PSExtensionHandler.class);
private StringBuffer content = new StringBuffer();
private Attributes lastAttributes;
private PSExtensionAttachment returnedObject;
private ObjectBuiltListener listener;
/** {@inheritDoc} */
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException {
boolean handled = false;
if (PSExtensionAttachment.CATEGORY.equals(uri)) {
lastAttributes = attributes;
handled = false;
if (localName.equals(PSSetupCode.ELEMENT)
|| localName.equals(PSSetPageDevice.ELEMENT)
|| localName.equals(PSCommentBefore.ELEMENT)
|| localName.equals(PSCommentAfter.ELEMENT)) {
//handled in endElement
handled = true;
}
}
if (!handled) {
if (PSExtensionAttachment.CATEGORY.equals(uri)) {
throw new SAXException("Unhandled element " + localName
+ " in namespace: " + uri);
} else {
log.warn("Unhandled element " + localName
+ " in namespace: " + uri);
}
}
}
/** {@inheritDoc} */
public void endElement(String uri, String localName, String qName) throws SAXException {
if (PSExtensionAttachment.CATEGORY.equals(uri)) {
if (PSSetupCode.ELEMENT.equals(localName)) {
String name = lastAttributes.getValue("name");
this.returnedObject = new PSSetupCode(name, content.toString());
} else if (PSSetPageDevice.ELEMENT.equals(localName)) {
String name = lastAttributes.getValue("name");
this.returnedObject = new PSSetPageDevice(name, content.toString());
} else if (PSCommentBefore.ELEMENT.equals(localName)) {
this.returnedObject = new PSCommentBefore(content.toString());
} else if (PSCommentAfter.ELEMENT.equals(localName)) {
this.returnedObject = new PSCommentAfter(content.toString());
}
}
content.setLength(0); //Reset text buffer (see characters())
}
/** {@inheritDoc} */
public void characters(char[] ch, int start, int length) throws SAXException {
content.append(ch, start, length);
}
/** {@inheritDoc} */
public void endDocument() throws SAXException {
if (listener != null) {
listener.notifyObjectBuilt(getObject());
}
}
/** {@inheritDoc} */
public Object getObject() {
return returnedObject;
}
/** {@inheritDoc} */
public void setObjectBuiltListener(ObjectBuiltListener listener) {
this.listener = listener;
}
}
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