| /* |
| * 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. |
| */ |
| package org.apache.myfaces.extensions.scripting.core.dependencyScan.core; |
| |
| import java.util.*; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * class dependency maps |
| * note this class is thread save |
| */ |
| public class ClassDependencies { |
| |
| /** |
| * reverse index which shows which |
| * a class name and which classes in the system depend on that |
| * classname |
| * <p/> |
| * <p/> |
| * the key is a dependency a class has the _value is a set of classes which depend on the current class |
| */ |
| private Map<String, Set<String>> reverseIndex = new ConcurrentHashMap<String, Set<String>>(); |
| |
| public void addDependency(String referencingClass, String referencedClass) { |
| Set<String> reverseDependencies = getReverseDependencies(referencedClass); |
| reverseDependencies.add(referencingClass); |
| } |
| |
| /** |
| * adds a set of dependencies to the |
| * reverse lookup index |
| * |
| * @param referencingClass the referencing class of this dependency |
| * @param referencedClasses the referenced class of this dependency |
| */ |
| public void addDependencies(String referencingClass, Collection<String> referencedClasses) { |
| for (String referencedClass : referencedClasses) { |
| addDependency(referencingClass, referencedClass); |
| } |
| } |
| |
| /** |
| * removes a referenced class an all its referencing classes! |
| * |
| * @param clazz the referenced class to be deleted |
| */ |
| public void removeReferenced(String clazz) { |
| reverseIndex.remove(clazz); |
| } |
| |
| /** |
| * removes a referencing class |
| * and deletes the referenced |
| * entry if it is not referenced anymore |
| * |
| * @param clazz the referencing class to delete |
| */ |
| @SuppressWarnings("unused") |
| public void removeReferrer(String clazz) { |
| List<String> emptyReferences = new ArrayList<String>(reverseIndex.size()); |
| for (Map.Entry<String, Set<String>> entry : reverseIndex.entrySet()) { |
| Set<String> entrySet = entry.getValue(); |
| entrySet.remove(clazz); |
| if (entrySet.isEmpty()) { |
| emptyReferences.add(entry.getKey()); |
| } |
| } |
| for (String toDelete : emptyReferences) { |
| removeReferenced(toDelete); |
| } |
| } |
| |
| public Set<String> getReferringClasses(String referencedClass) { |
| return reverseIndex.get(referencedClass); |
| } |
| |
| private Set<String> getReverseDependencies(String dependency) { |
| Set<String> dependencies = reverseIndex.get(dependency); |
| if (dependencies == null) { |
| dependencies = Collections.synchronizedSet(new HashSet<String>()); |
| reverseIndex.put(dependency, dependencies); |
| } |
| return dependencies; |
| } |
| |
| } |