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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed 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.
*/
package org.apache.tuscany.model.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* @author jsdelfino
*
* Base implementation for a model transformer.
* Invokes a model content handler to perform the actual transformation.
*/
public class ModelTransformerImpl implements ModelTransformer {
/**
* Uses a ModelContentHandler to transform a model.
*/
public List transform(Iterator iterator, ModelContentHandler handler) {
// Pass 1: visit the source model and create target model objects
List linkers=new ArrayList();
List contents=transformPass1(iterator, handler, linkers);
// Pass 2: resolve the links between the target model objects
transformPass2(linkers);
// Return the target model contents
return contents;
}
/**
* Uses a ModelContentHandler to transform a model.
*/
public List transformPass1(Iterator iterator, final ModelContentHandler handler, List deferredHandlers, Map targets, List contents) {
// Initialize the handler
handler.setTargets(targets);
handler.setLinkers(deferredHandlers);
handler.setContents(contents);
// This runnable will invoke endModel and clean up the handler
Runnable cleanup=new Runnable() {
public void run() {
// Cleanup
handler.endModel();
handler.setTargets(null);
handler.setLinkers(null);
handler.setContents(null);
}
};
// Run the handler
try {
handler.startModel();
// Pass 1: compile, visit the source model and create target model objects
for (; iterator.hasNext(); ) {
Object source=iterator.next();
if (source==null)
System.out.println("Ooops");
Object target=handler.doSwitch(source);
// Record source to target associations
targets.put(source,target);
}
// Add the cleanup runnable
deferredHandlers.add(cleanup);
} catch (Exception e) {
// An exception occurred, run the cleanup now
cleanup.run();
throw new RuntimeException(e);
}
// return the target model contents
// note that this list may actually be populated in pass2
return contents;
}
/**
* Uses a ModelContentHandler to transform a model.
*/
public List transformPass1(Iterator iterator, final ModelContentHandler handler, List deferredHandlers) {
Map targets=new HashMap();
List contents=new ArrayList();
return transformPass1(iterator,handler,deferredHandlers,targets,contents);
}
/**
* Uses a ModelContentHandler to transform a model.
*/
public void transformPass2(List deferredHandlers) {
// Pass 2: link, resolve the links between the target model objects
for (Iterator i=deferredHandlers.iterator(); i.hasNext(); ) {
Runnable runnable=(Runnable)i.next();
runnable.run();
}
}
}
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