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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.ui.view;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.core.runtime.preferences.InstanceScope;
import com.motorolamobility.studio.android.db.core.DbCoreActivator;
import com.motorolamobility.studio.android.db.core.ui.ISaveStateTreeNode;
/**
* Manager class responsible to handle save state for tree nodes.
* Note: The saveState method will be called only after workbench quits, quiting the view will not fire the save event state.
* This class is a singleton.
* Users must register the ISaveStateTreenode by using resiterSaveStateNode method.
* Don't forget to unregister the node if node is removed.
*/
public class SaveStateManager
{
private static SaveStateManager instance;
private final Set<ISaveStateTreeNode> registeredTreeNodes;
private final IEclipsePreferences prefNode;
/*
* Private constructor, this is a singleton.
*/
private SaveStateManager()
{
registeredTreeNodes = Collections.synchronizedSet(new HashSet<ISaveStateTreeNode>());
prefNode = InstanceScope.INSTANCE.getNode(DbCoreActivator.PLUGIN_ID);
}
/**
* @return the single instance of {@link SaveStateManager}
*/
public static SaveStateManager getInstance()
{
if (instance == null)
{
instance = new SaveStateManager();
}
return instance;
}
/**
* Register a node to be saved.
* @param treeNode to be asked for save
*/
public void registerSaveStateNode(ISaveStateTreeNode treeNode)
{
synchronized (registeredTreeNodes)
{
registeredTreeNodes.add(treeNode);
}
}
/**
* Calls the saveState method for all registered nodes.
* @param memento
*/
public void saveState()
{
synchronized (registeredTreeNodes)
{
for (ISaveStateTreeNode registeredTreeNode : registeredTreeNodes)
{
registeredTreeNode.saveState(prefNode);
}
}
}
/**
* Unregister the given node from this manager.
* @param node
*/
public void unregisterSaveStateNode(ISaveStateTreeNode node)
{
synchronized (registeredTreeNodes)
{
registeredTreeNodes.remove(node);
}
}
/**
* Retrieves the {@link IEclipsePreferences} prefNode.
* @return The {@link IEclipsePreferences} node used bu this manager to save the states.
*/
public IEclipsePreferences getPrefNode()
{
return prefNode;
}
}
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