| /* |
| * 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.felix.prefs; |
| |
| import java.util.*; |
| |
| /** |
| * This class keeps track of the changes to a preferences node. |
| */ |
| public class ChangeSet { |
| |
| /** Do we have changes at all? */ |
| protected boolean hasChanges = false; |
| |
| /** A set of changed/added properties. */ |
| protected final Set changedProperties = new HashSet(); |
| |
| /** A set of removed properties. */ |
| protected final Set removedProperties = new HashSet(); |
| |
| /** A set of added children. */ |
| protected final Set addedChildren = new HashSet(); |
| |
| /** A set of removed children. */ |
| protected final Set removedChildren = new HashSet(); |
| |
| /** |
| * Do we have changes? |
| * @return True if there are any changes. |
| */ |
| public boolean hasChanges() { |
| return this.hasChanges; |
| } |
| |
| /** |
| * Inform that a property has been added/changed. |
| * @param name The name of the property. |
| */ |
| public void propertyChanged(String name) { |
| this.hasChanges = true; |
| this.removedProperties.remove(name); |
| this.changedProperties.add(name); |
| } |
| |
| /** |
| * Inform that a property has removed. |
| * @param name The name of the property. |
| */ |
| public void propertyRemoved(String name) { |
| this.hasChanges = true; |
| this.changedProperties.remove(name); |
| this.removedProperties.add(name); |
| } |
| |
| /** |
| * Inform that a child has been added. |
| * @param name The name of the child. |
| */ |
| public void childAdded(String name) { |
| this.hasChanges = true; |
| this.removedChildren.remove(name); |
| this.addedChildren.add(name); |
| } |
| |
| /** |
| * Inform that a child has been removed. |
| * @param name The name of the child. |
| */ |
| public void childRemoved(String name) { |
| this.hasChanges = true; |
| this.addedChildren.remove(name); |
| this.removedChildren.add(name); |
| } |
| |
| /** |
| * Reset state to unchanged. |
| */ |
| public void clear() { |
| this.hasChanges = false; |
| this.removedChildren.clear(); |
| this.removedProperties.clear(); |
| this.addedChildren.clear(); |
| this.changedProperties.clear(); |
| } |
| |
| /** |
| * Import the changes from the other change set. |
| * @param other |
| */ |
| public void importChanges(ChangeSet other) { |
| if (other.hasChanges) { |
| this.hasChanges = true; |
| this.addedChildren.addAll(other.addedChildren); |
| this.removedChildren.addAll(other.removedChildren); |
| this.changedProperties.addAll(other.changedProperties); |
| this.removedProperties.addAll(other.removedProperties); |
| } |
| } |
| |
| /** |
| * Return a collection with the changed property names. |
| * @return A collection. |
| */ |
| public Collection getChangedProperties() { |
| return Collections.unmodifiableCollection(this.changedProperties); |
| } |
| |
| /** |
| * Return a collection with the removed property names. |
| * @return A collection. |
| */ |
| public Collection getRemovedProperties() { |
| return Collections.unmodifiableCollection(this.removedProperties); |
| } |
| |
| /** |
| * Return a collection with the added children names. |
| * @return A collection. |
| */ |
| public Collection getAddedChildren() { |
| return Collections.unmodifiableCollection(this.addedChildren); |
| } |
| |
| /** |
| * Return a collection with the removed children names. |
| * @return A collection. |
| */ |
| public Collection getRemovedChildren() { |
| return Collections.unmodifiableCollection(this.removedChildren); |
| } |
| } |