com.github.sdbg.debug.ui.internal.util.SelectionUtil.java Source code

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Here is the source code for com.github.sdbg.debug.ui.internal.util.SelectionUtil.java

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/*
 * Copyright (c) 2011, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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.github.sdbg.debug.ui.internal.util;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IResource;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchPartReference;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.part.ISetSelectionTarget;

//&&& Only used by the custom views inherited by Dart
public class SelectionUtil {

    /**
     * Returns the selected element if the selection consists of a single element only.
     * 
     * @param s the selection
     * @return the selected first element or null
     */
    public static Object getSingleElement(ISelection s) {
        if (!(s instanceof IStructuredSelection)) {
            return null;
        }
        IStructuredSelection selection = (IStructuredSelection) s;
        if (selection.size() != 1) {
            return null;
        }

        return selection.getFirstElement();
    }

    /**
     * Attempts to select and reveal the specified resources in all parts within the supplied
     * workbench window's active page.
     * <p>
     * Checks all parts in the active page to see if they implement <code>ISetSelectionTarget</code>,
     * either directly or as an adapter. If so, tells the part to select and reveal the specified
     * resources.
     * </p>
     * 
     * @param resources the resources to be selected and revealed
     * @param window the workbench window to select and reveal the resource
     * @see ISetSelectionTarget
     * @see org.eclipse.ui.wizards.newresource.BasicNewResourceWizard#selectAndReveal(IResource,
     *      IWorkbenchWindow)
     */
    public static void selectAndReveal(IResource[] resources, IWorkbenchWindow window) {
        // validate the input
        if (window == null || resources == null || Arrays.asList(resources).contains(null)) {
            return;
        }
        IWorkbenchPage page = window.getActivePage();
        if (page == null) {
            return;
        }

        // get all the view and editor parts
        List<IWorkbenchPart> parts = new ArrayList<IWorkbenchPart>();
        IWorkbenchPartReference refs[] = page.getViewReferences();
        for (int i = 0; i < refs.length; i++) {
            IWorkbenchPart part = refs[i].getPart(false);
            if (part != null) {
                parts.add(part);
            }
        }
        refs = page.getEditorReferences();
        for (int i = 0; i < refs.length; i++) {
            if (refs[i].getPart(false) != null) {
                parts.add(refs[i].getPart(false));
            }
        }

        final ISelection selection = new StructuredSelection(resources);
        Iterator<IWorkbenchPart> itr = parts.iterator();
        while (itr.hasNext()) {
            IWorkbenchPart part = itr.next();

            // get the part's ISetSelectionTarget implementation
            ISetSelectionTarget target = null;
            if (part instanceof ISetSelectionTarget) {
                target = (ISetSelectionTarget) part;
            } else {
                target = (ISetSelectionTarget) part.getAdapter(ISetSelectionTarget.class);
            }

            if (target != null) {
                // select and reveal resource
                final ISetSelectionTarget finalTarget = target;
                window.getShell().getDisplay().asyncExec(new Runnable() {
                    @Override
                    public void run() {
                        finalTarget.selectReveal(selection);
                    }
                });
            }
        }
    }

    @SuppressWarnings("rawtypes")
    public static List toList(ISelection selection) {
        if (selection instanceof IStructuredSelection) {
            return ((IStructuredSelection) selection).toList();
        }
        return null;
    }

}