eu.numberfour.n4js.ui.workingsets.internal.N4JSNewWizardsActionGroup.java Source code

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Here is the source code for eu.numberfour.n4js.ui.workingsets.internal.N4JSNewWizardsActionGroup.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 java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IResource;
import org.eclipse.jdt.ui.IContextMenuConstants;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.actions.ActionGroup;
import org.eclipse.ui.actions.NewWizardMenu;

import eu.numberfour.n4js.ui.workingsets.WorkingSet;

/**
 * N4JS working set aware 'New' wizard action group contribution for the navigator.
 */
public class N4JSNewWizardsActionGroup extends ActionGroup {

    private final IWorkbenchSite fSite;
    private NewWizardMenu fNewWizardMenu;

    /**
     * Creates a new <code>NewWizardsActionGroup</code>. The group requires that the selection provided by the part's
     * selection provider is of type <code>
     * org.eclipse.jface.viewers.IStructuredSelection</code>.
     *
     * @param site
     *            the view part that owns this action group
     */
    public N4JSNewWizardsActionGroup(final IWorkbenchSite site) {
        fSite = site;
    }

    @Override
    public void fillContextMenu(final IMenuManager menu) {
        super.fillContextMenu(menu);

        final ISelection selection = getContext().getSelection();
        if (selection instanceof IStructuredSelection) {
            if (canEnable((IStructuredSelection) selection)) {
                final MenuManager newMenu = new MenuManager("Ne&w");
                menu.appendToGroup(IContextMenuConstants.GROUP_NEW, newMenu);
                newMenu.add(getNewWizardMenu());
            }
        }

    }

    private NewWizardMenu getNewWizardMenu() {
        if (fNewWizardMenu == null) {
            fNewWizardMenu = new NewWizardMenu(fSite.getWorkbenchWindow());
        }
        return fNewWizardMenu;
    }

    private boolean canEnable(final IStructuredSelection sel) {
        if (sel.size() == 0) {
            return true;
        }

        final List<?> list = sel.toList();
        for (final Iterator<?> iterator = list.iterator(); iterator.hasNext(); /**/) {
            if (!isNewTarget(iterator.next())) {
                return false;
            }
        }

        return true;
    }

    private boolean isNewTarget(final Object element) {
        if (element == null) {
            return true;
        }
        if (element instanceof IResource) {
            return true;
        }
        if (element instanceof WorkingSet) {
            return true;
        }
        return false;
    }

    @Override
    public void dispose() {
        if (fNewWizardMenu != null) {
            fNewWizardMenu.dispose();
            fNewWizardMenu = null;
        }
        super.dispose();
    }

}