com.sap.dirigible.ide.workspace.ui.commands.AbstractClipboardHandler.java Source code

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Here is the source code for com.sap.dirigible.ide.workspace.ui.commands.AbstractClipboardHandler.java

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/*******************************************************************************
 * Copyright (c) 2014 SAP AG or an SAP affiliate company. All rights reserved.
 * 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.sap.dirigible.ide.workspace.ui.commands;

import java.util.Comparator;
import java.util.SortedSet;
import java.util.TreeSet;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.resources.IResource;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.handlers.HandlerUtil;

public abstract class AbstractClipboardHandler extends AbstractHandler {

    public static final String CUT = "WORKSPACE_CUT"; //$NON-NLS-1$
    public static final String COPY = "WORKSPACE_COPY"; //$NON-NLS-1$
    public static final String PASTE = "WORKSPACE_PASTE"; //$NON-NLS-1$

    // TODO: Must determine when this command is enabled or not.

    public Object execute(ExecutionEvent event) throws ExecutionException {
        ISelection selection = HandlerUtil.getCurrentSelection(event);
        if (selection instanceof IStructuredSelection) {
            execute(event, (IStructuredSelection) selection);
        }
        return null;
    }

    public void execute(ExecutionEvent event, IStructuredSelection selection) {
        Comparator<IResource> comparator = new ResourceComparator();
        SortedSet<IResource> resources = new TreeSet<IResource>(comparator);
        for (Object element : selection.toArray()) {
            if (element instanceof IResource) {
                resources.add((IResource) element);
            }
        }
        execute(event, resources);
    }

    protected abstract void execute(ExecutionEvent event, SortedSet<IResource> resources);

    private class ResourceComparator implements Comparator<IResource> {

        @Override
        public int compare(IResource o1, IResource o2) {
            int segmentCount1 = o1.getFullPath().segmentCount();
            int segmentCount2 = o2.getFullPath().segmentCount();
            if (segmentCount1 == segmentCount2) {
                String path1 = o1.getFullPath().toString();
                String path2 = o2.getFullPath().toString();
                return path2.compareTo(path1);
            } else {
                return segmentCount2 - segmentCount1;
            }
        }

    }

}