| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed 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 com.motorolamobility.studio.android.db.core.event; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import com.motorolamobility.studio.android.db.core.ui.ITreeNode; |
| |
| /** |
| * Manager which notifies {@link IDatabaseModelListener} registered that a {@link DatabaseModelEvent} occurred. |
| * It is a singleton that needs to be called by the hierarchy of {@link ITreeNode} items when they modify the database model. |
| */ |
| public class DatabaseModelEventManager |
| { |
| private static DatabaseModelEventManager _instance; |
| |
| private final List<IDatabaseModelListener> listeners = new ArrayList<IDatabaseModelListener>(); |
| |
| private DatabaseModelEventManager() |
| { |
| //Singleton - avoid extensions and other means to construct an instance |
| } |
| |
| /** |
| * @return single instance of {@link DatabaseModelEvent} |
| */ |
| public synchronized static DatabaseModelEventManager getInstance() |
| { |
| if (_instance == null) |
| { |
| _instance = new DatabaseModelEventManager(); |
| } |
| return _instance; |
| } |
| |
| /** |
| * Adds a new {@link IDatabaseModelListener} |
| * @param listener |
| */ |
| public void addListener(IDatabaseModelListener listener) |
| { |
| synchronized (listener) |
| { |
| listeners.add(listener); |
| } |
| } |
| |
| /** |
| * Removes the {@link IDatabaseModelListener} |
| * @param listener |
| */ |
| public void removeListeners(IDatabaseModelListener listener) |
| { |
| synchronized (listener) |
| { |
| listeners.remove(listener); |
| } |
| } |
| |
| /** |
| * Fires/notifies/deliver the event to the listeners registered. |
| * @param node {@link ITreeNode} that needs to refresh the view based on the model |
| * @param eventType |
| */ |
| public void fireEvent(ITreeNode node, DatabaseModelEvent.EVENT_TYPE eventType) |
| { |
| DatabaseModelEvent databaseModelEvent = new DatabaseModelEvent(node, eventType); |
| synchronized (listeners) |
| { |
| if (listeners != null) |
| { |
| for (IDatabaseModelListener listener : listeners) |
| { |
| switch (eventType) |
| { |
| case ADD: |
| listener.handleNodeAdditionEvent(databaseModelEvent); |
| break; |
| case REMOVE: |
| listener.handleNodeRemovalEvent(databaseModelEvent); |
| break; |
| case UPDATE: |
| listener.handleNodeUpdateEvent(databaseModelEvent); |
| break; |
| case CLEAR: |
| listener.handleNodeClearEvent(databaseModelEvent); |
| break; |
| case EXPAND: |
| listener.handleNodeExpandEvent(databaseModelEvent); |
| break; |
| case SELECT: |
| listener.handleNodeSelectEvent(databaseModelEvent); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| } |
| } |
| } |