com.mercatis.lighthouse3.ui.environment.handlers.CollapseAllHandler.java Source code

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Here is the source code for com.mercatis.lighthouse3.ui.environment.handlers.CollapseAllHandler.java

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/*
 * Copyright 2011 mercatis Technologies AG
 * 
 * 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.mercatis.lighthouse3.ui.environment.handlers;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.jface.viewers.AbstractTreeViewer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.navigator.CommonNavigator;

public class CollapseAllHandler extends AbstractHandler implements IHandler {

    /* (non-Javadoc)
     * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
     */
    public Object execute(ExecutionEvent event) throws ExecutionException {

        CommonNavigator navigator = (CommonNavigator) HandlerUtil.getActivePart(event);

        ISelection selection = HandlerUtil.getCurrentSelection(event);
        if (selection == null || !(selection instanceof IStructuredSelection))
            return null;

        IStructuredSelection structuredSelection = (IStructuredSelection) selection;

        if (!structuredSelection.isEmpty()) {
            navigator.getCommonViewer().collapseToLevel(structuredSelection.getFirstElement(),
                    AbstractTreeViewer.ALL_LEVELS);
        }
        return null;
    }

}