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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.intermediate.extensions;
import java.util.Iterator;
import java.util.Map;
/**
* This class manages actions and action references. Some action (like {@link GoToXYAction}s)
* cannot be fully resolved at the time they are needed, so they are deferred. This class
* helps manages the references and resolution.
*/
public class ActionSet {
private int lastGeneratedID = 0;
private Map actionRegistry = new java.util.HashMap();
/**
* Generates a new synthetic ID for an action.
* @param action the action
* @return the generated ID
*/
public synchronized String generateNewID(AbstractAction action) {
this.lastGeneratedID++;
String prefix = action.getIDPrefix();
if (prefix == null) {
throw new IllegalArgumentException("Action class is not compatible");
}
return prefix + this.lastGeneratedID;
}
/**
* Returns the action with the given ID.
* @param id the ID
* @return the action or null if no action with this ID is stored
*/
public AbstractAction get(String id) {
return (AbstractAction)this.actionRegistry.get(id);
}
/**
* Puts an action into the set and returns the normalized instance (another one if the given
* one is equal to another.
* @param action the action
* @return the action instance that should be used in place of the given one
*/
public AbstractAction put(AbstractAction action) {
if (!action.hasID()) {
action.setID(generateNewID(action));
}
AbstractAction effAction = normalize(action);
if (effAction == action) {
this.actionRegistry.put(action.getID(), action);
}
return effAction;
}
/**
* Clears the set.
*/
public void clear() {
this.actionRegistry.clear();
}
private AbstractAction normalize(AbstractAction action) {
Iterator iter = this.actionRegistry.values().iterator();
while (iter.hasNext()) {
AbstractAction a = (AbstractAction)iter.next();
if (a.isSame(action)) {
return a;
}
}
return action;
}
}
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