ToggleNatureAction.java

/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 *   General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */

package org.granite.builder;

import java.util.Iterator;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

/**
 * @author Franck WOLFF
 */
public class ToggleNatureAction implements IObjectActionDelegate {

    private ISelection selection;

    @Override
	public void run(IAction action) {
        if (selection instanceof IStructuredSelection) {
            for (Iterator<?> it = ((IStructuredSelection)selection).iterator(); it.hasNext(); ) {
                Object element = it.next();
                
                IProject project = null;
                if (element instanceof IProject)
                    project = (IProject)element;
                else if (element instanceof IAdaptable)
                    project = (IProject)((IAdaptable)element).getAdapter(IProject.class);
                
                if (project != null)
                    toggleNature(project);
            }
        }
    }

    @Override
	public void selectionChanged(IAction action, ISelection selection) {
        this.selection = selection;
    }

    @Override
	public void setActivePart(IAction action, IWorkbenchPart targetPart) {
    }

    public static void toggleNature(IProject project) {
        try {
            IProjectDescription description = project.getDescription();
            String[] natures = description.getNatureIds();

            for (int i = 0; i < natures.length; ++i) {
                if (GraniteNature.NATURE_ID.equals(natures[i])) {
                    // Remove granite nature
                    String[] newNatures = new String[natures.length - 1];
                    System.arraycopy(natures, 0, newNatures, 0, i);
                    System.arraycopy(natures, i + 1, newNatures, i, natures.length - i - 1);
                    description.setNatureIds(newNatures);
                    project.setDescription(description, null);
                    return;
                }
            }

            // Add granite nature
            String[] newNatures = new String[natures.length + 1];
            System.arraycopy(natures, 0, newNatures, 0, natures.length);
            newNatures[natures.length] = GraniteNature.NATURE_ID;
            description.setNatureIds(newNatures);
            project.setDescription(description, null);
        } catch (CoreException e) {
        }
    }
}