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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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