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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.events.model;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.Iterator;
import java.util.Map;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;
import org.apache.commons.io.IOUtils;
import org.apache.xmlgraphics.util.XMLizable;
/**
* Represents a whole event model that supports multiple event producers.
*/
public class EventModel implements Serializable, XMLizable {
private static final long serialVersionUID = 7468592614934605082L;
private Map producers = new java.util.LinkedHashMap();
/**
* Creates a new, empty event model
*/
public EventModel() {
}
/**
* Adds the model of an event producer to the event model.
* @param producer the event producer model
*/
public void addProducer(EventProducerModel producer) {
this.producers.put(producer.getInterfaceName(), producer);
}
/**
* Returns an iterator over the contained event producer models.
* @return an iterator (Iterator<EventProducerModel>)
*/
public Iterator getProducers() {
return this.producers.values().iterator();
}
/**
* Returns the model of an event producer with the given interface name.
* @param interfaceName the fully qualified name of the event producer
* @return the model instance for the event producer (or null if it wasn't found)
*/
public EventProducerModel getProducer(String interfaceName) {
return (EventProducerModel)this.producers.get(interfaceName);
}
/**
* Returns the model of an event producer with the given interface.
* @param clazz the interface of the event producer
* @return the model instance for the event producer (or null if it wasn't found)
*/
public EventProducerModel getProducer(Class clazz) {
return getProducer(clazz.getName());
}
/** {@inheritDoc} */
public void toSAX(ContentHandler handler) throws SAXException {
AttributesImpl atts = new AttributesImpl();
String elName = "event-model";
handler.startElement("", elName, elName, atts);
Iterator iter = getProducers();
while (iter.hasNext()) {
((XMLizable)iter.next()).toSAX(handler);
}
handler.endElement("", elName, elName);
}
private void writeXMLizable(XMLizable object, File outputFile) throws IOException {
//These two approaches do not seem to work in all environments:
//Result res = new StreamResult(outputFile);
//Result res = new StreamResult(outputFile.toURI().toURL().toExternalForm());
//With an old Xalan version: file:/C:/.... --> file:\C:\.....
OutputStream out = new java.io.FileOutputStream(outputFile);
out = new java.io.BufferedOutputStream(out);
Result res = new StreamResult(out);
try {
SAXTransformerFactory tFactory
= (SAXTransformerFactory)SAXTransformerFactory.newInstance();
TransformerHandler handler = tFactory.newTransformerHandler();
Transformer transformer = handler.getTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
handler.setResult(res);
handler.startDocument();
object.toSAX(handler);
handler.endDocument();
} catch (TransformerConfigurationException e) {
throw new IOException(e.getMessage());
} catch (TransformerFactoryConfigurationError e) {
throw new IOException(e.getMessage());
} catch (SAXException e) {
throw new IOException(e.getMessage());
} finally {
IOUtils.closeQuietly(out);
}
}
/**
* Saves this event model to an XML file.
* @param modelFile the target file
* @throws IOException if an I/O error occurs
*/
public void saveToXML(File modelFile) throws IOException {
writeXMLizable(this, modelFile);
}
}
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