DeleteHandler.java

/*******************************************************************************
 * Copyright 2013 Geoscience Australia
 * 
 * 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 au.gov.ga.earthsci.catalog.ui.handler;

import javax.inject.Named;

import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.ui.services.IServiceConstants;

import au.gov.ga.earthsci.catalog.ICatalogTreeNode;

/**
 * Handles deletion of removeable catalog tree nodes.
 * 
 * @author Michael de Hoog (michael.dehoog@ga.gov.au)
 */
public class DeleteHandler
{
	@Execute
	public void execute(@Named(IServiceConstants.ACTIVE_SELECTION) ICatalogTreeNode[] selectedNodes)
	{
		if (selectedNodes != null)
		{
			for (ICatalogTreeNode node : selectedNodes)
			{
				if (node != null && node.isRemoveable())
				{
					node.removeFromParent();
				}
			}
		}
	}

	@CanExecute
	public boolean canExecute(@Optional @Named(IServiceConstants.ACTIVE_SELECTION) ICatalogTreeNode[] selectedNodes)
	{
		if (selectedNodes != null)
		{
			for (ICatalogTreeNode node : selectedNodes)
			{
				if (node.isRemoveable())
				{
					return true;
				}
			}
		}
		return false;
	}
}