/*
* 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.
*/
import java.util.LinkedList;
import java.util.Iterator;
import org.apache.commons.digester.Digester;
import org.apache.commons.digester.plugins.PluginCreateRule;
/**
* An implementation of the Transform interface which is configured with
* a sequence of "subtransforms", and applies them one by one to the input
* data.
* <p>
* This demonstrates that a plugged-in class can itself define plugin-points
* for user-defined classes if it wishes.
*/
public class CompoundTransform implements Transform {
private LinkedList transforms = new LinkedList();
public void addTransform(Transform transform) {
transforms.add(transform);
}
public String transform(String s) {
for(Iterator i = transforms.iterator(); i.hasNext(); ) {
Transform t = (Transform) i.next();
s = t.transform(s);
}
return s;
}
public static void addRules(Digester d, String patternPrefix) {
PluginCreateRule pcr = new PluginCreateRule(Transform.class);
d.addRule(patternPrefix+"/subtransform", pcr);
d.addSetNext(patternPrefix+"/subtransform", "addTransform");
}
}