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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.util.Stack;
-
- import javax.xml.transform.Source;
- import javax.xml.transform.Transformer;
- import javax.xml.transform.TransformerException;
- import javax.xml.transform.sax.SAXResult;
- import javax.xml.transform.sax.SAXTransformerFactory;
-
- import org.xml.sax.Attributes;
- import org.xml.sax.ContentHandler;
- 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.DefaultErrorListener;
-
- /**
- * This is a parser for the event model XML.
- */
- public final class EventModelParser {
-
- private EventModelParser() {
- }
-
- /** Logger instance */
- private static final Log log // CSOK: ConstantName
- = LogFactory.getLog(EventModelParser.class);
-
- private static SAXTransformerFactory tFactory
- = (SAXTransformerFactory)SAXTransformerFactory.newInstance();
-
- /**
- * Parses an event model file into an EventModel instance.
- * @param src the Source instance pointing to the XML file
- * @return the created event model structure
- * @throws TransformerException if an error occurs while parsing the XML file
- */
- public static EventModel parse(Source src)
- throws TransformerException {
- Transformer transformer = tFactory.newTransformer();
- transformer.setErrorListener(new DefaultErrorListener(log));
-
- EventModel model = new EventModel();
- SAXResult res = new SAXResult(getContentHandler(model));
-
- transformer.transform(src, res);
- return model;
- }
-
- /**
- * Creates a new ContentHandler instance that you can send the event model XML to. The parsed
- * content is accumulated in the model structure.
- * @param model the EventModel
- * @return the ContentHandler instance to receive the SAX stream from the XML file
- */
- public static ContentHandler getContentHandler(EventModel model) {
- return new Handler(model);
- }
-
- private static class Handler extends DefaultHandler {
-
- private EventModel model;
- private Stack objectStack = new Stack();
-
- public Handler(EventModel model) {
- this.model = model;
- }
-
- /** {@inheritDoc} */
- public void startElement(String uri, String localName, String qName, Attributes attributes)
- throws SAXException {
- try {
- if ("event-model".equals(localName)) {
- if (objectStack.size() > 0) {
- throw new SAXException("event-model must be the root element");
- }
- objectStack.push(model);
- } else if ("producer".equals(localName)) {
- EventProducerModel producer = new EventProducerModel(
- attributes.getValue("name"));
- EventModel parent = (EventModel)objectStack.peek();
- parent.addProducer(producer);
- objectStack.push(producer);
- } else if ("method".equals(localName)) {
- EventSeverity severity = EventSeverity.valueOf(attributes.getValue("severity"));
- String ex = attributes.getValue("exception");
- EventMethodModel method = new EventMethodModel(
- attributes.getValue("name"), severity);
- if (ex != null && ex.length() > 0) {
- method.setExceptionClass(ex);
- }
- EventProducerModel parent = (EventProducerModel)objectStack.peek();
- parent.addMethod(method);
- objectStack.push(method);
- } else if ("parameter".equals(localName)) {
- String className = attributes.getValue("type");
- Class type;
- try {
- type = Class.forName(className);
- } catch (ClassNotFoundException e) {
- throw new SAXException("Could not find Class for: " + className, e);
- }
- String name = attributes.getValue("name");
- EventMethodModel parent = (EventMethodModel)objectStack.peek();
- objectStack.push(parent.addParameter(type, name));
- } else {
- throw new SAXException("Invalid element: " + qName);
- }
- } catch (ClassCastException cce) {
- throw new SAXException("XML format error: " + qName, cce);
- }
- }
-
- /** {@inheritDoc} */
- public void endElement(String uri, String localName, String qName) throws SAXException {
- objectStack.pop();
- }
-
- }
-
- }
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