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/*
* 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;
}
}
}
}
}
}
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