eu.numberfour.n4js.ui.workingsets.internal.HideWorkingSetAction.java Source code

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Here is the source code for eu.numberfour.n4js.ui.workingsets.internal.HideWorkingSetAction.java

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/**
 * Copyright (c) 2016 NumberFour AG.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   NumberFour AG - Initial API and implementation
 */
package eu.numberfour.n4js.ui.workingsets.internal;

import static com.google.common.collect.Lists.newArrayList;

import java.util.List;

import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.actions.ActionFactory.IWorkbenchAction;
import org.eclipse.ui.actions.SelectionListenerAction;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Iterables;

import eu.numberfour.n4js.ui.ImageDescriptorCache.ImageRef;
import eu.numberfour.n4js.ui.workingsets.WorkingSet;
import eu.numberfour.n4js.ui.workingsets.WorkingSetDiffBuilder;
import eu.numberfour.n4js.ui.workingsets.WorkingSetManager;
import eu.numberfour.n4js.utils.Arrays2;
import eu.numberfour.n4js.utils.Diff;

/**
 * Action for hiding one or more working set instances based on the actual selection.
 */
public class HideWorkingSetAction extends SelectionListenerAction implements IWorkbenchAction {

    /**
     * Creates a new action instance.
     */
    public HideWorkingSetAction() {
        super("Hide Selected Working Set");
        setImageDescriptor(ImageRef.CLEAR.asImageDescriptor().orNull());
    }

    @Override
    public void run() {
        final IStructuredSelection selection = getStructuredSelection();
        final Object[] selectionElements = selection.toArray();
        final WorkingSet[] selectedWorkingSets = Arrays2.filter(selectionElements, WorkingSet.class);

        final WorkingSetManager manager = selectedWorkingSets[0].getWorkingSetManager();
        final WorkingSetDiffBuilder builder = new WorkingSetDiffBuilder(manager);
        final WorkingSet[] newAllItems = manager.getAllWorkingSets();
        final List<WorkingSet> newItems = newArrayList(manager.getWorkingSets());
        for (final WorkingSet toHide : selectedWorkingSets) {
            newItems.remove(toHide);
        }
        final Diff<WorkingSet> diff = builder.build(Iterables.toArray(newItems, WorkingSet.class), newAllItems);
        if (!diff.isEmpty()) {
            manager.updateState(diff);
            manager.saveState(new NullProgressMonitor());
            manager.getWorkingSetManagerBroker().refreshNavigator();
        }
    }

    @Override
    public void dispose() {
        // Currently nothing to dispose.
    }

    @Override
    @VisibleForTesting
    public boolean updateSelection(IStructuredSelection selection) {
        if (selection == null || selection.isEmpty()) {
            return false;
        }

        final Object[] selectionElements = selection.toArray();
        final WorkingSet[] selectedWorkingSets = Arrays2.filter(selectionElements, WorkingSet.class);

        if (selectionElements.length != selectedWorkingSets.length) {
            return false;
        }

        final WorkingSetManager manager = selectedWorkingSets[0].getWorkingSetManager();
        // Cannot hide all working sets.
        return manager.getWorkingSets().length > selectedWorkingSets.length;
    }

}