/*******************************************************************************
* Copyright 2012 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.bookmark.ui.handlers;
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.bookmark.model.IBookmark;
/**
* An abstract command handler that has a {@link #canExecute(IBookmark[])}
* method that only enables the command when a single bookmark is selected.
*
* @author James Navin (james.navin@ga.gov.au)
*/
public abstract class AbstractSingleBookmarkHandler
{
@Execute
public void execute(@Optional @Named(IServiceConstants.ACTIVE_SELECTION) IBookmark[] selectedBookmarks)
{
doExecute(selectedBookmarks[0]);
}
/**
* Perform handler specific logic here
*
* @param selectedBookmark
* The currently selected bookmark
*/
protected abstract void doExecute(IBookmark selectedBookmark);
@CanExecute
public boolean canExecute(@Optional @Named(IServiceConstants.ACTIVE_SELECTION) IBookmark[] selectedBookmarks)
{
return selectedBookmarks != null && selectedBookmarks.length == 1;
}
}