org.spotter.eclipse.ui.handlers.DuplicateHandler.java Source code

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Here is the source code for org.spotter.eclipse.ui.handlers.DuplicateHandler.java

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/**
 * Copyright 2014 SAP 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 org.spotter.eclipse.ui.handlers;

import java.util.Iterator;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.spotter.eclipse.ui.Activator;
import org.spotter.eclipse.ui.navigator.IDuplicatable;
import org.spotter.eclipse.ui.util.SpotterUtils;

/**
 * A duplicate handler for the duplicate command which duplicates the selected
 * element. The handler is only enabled when a single, duplicatable element is
 * selected in the DynamicSpotter Project Navigator.
 * 
 * @author Denis Knoepfle
 * 
 */
public class DuplicateHandler extends AbstractHandler {

    /**
     * The id of the duplicate command.
     */
    public static final String DUPLICATE_COMMAND_ID = "org.spotter.eclipse.ui.commands.duplicate";

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {
        Activator activator = Activator.getDefault();
        TreeViewer viewer = activator.getNavigatorViewer();
        if (viewer == null) {
            return null;
        }

        IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
        Iterator<?> iter = selection.iterator();
        while (iter.hasNext()) {
            SpotterUtils.duplicateNavigatorElement(iter.next());
        }

        return null;
    }

    /**
     * Returns <code>true</code> when exactly one duplicatable is selected.
     * 
     * @return <code>true</code> when exactly one duplicatable is selected
     */
    @Override
    public boolean isEnabled() {
        Activator activator = Activator.getDefault();
        TreeViewer viewer = activator.getNavigatorViewer();
        if (viewer == null) {
            return false;
        }

        IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
        if (selection.size() != 1) {
            return false;
        }

        // check if selected element is duplicatable
        Object element = selection.iterator().next();
        boolean isDuplicatable = (element instanceof IDuplicatable);

        return isDuplicatable;
    }

}