ccw.commands.ToggleNatureCommand.java Source code

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Here is the source code for ccw.commands.ToggleNatureCommand.java

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/*******************************************************************************
 * Copyright (c) 2009 Casey Marshal and others.
 * 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: 
 *    Casey Marshal - initial API and implementation
 *******************************************************************************/
package ccw.commands;

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

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
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.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.handlers.HandlerUtil;

import ccw.CCWPlugin;
import ccw.ClojureCore;
import ccw.util.DisplayUtil;

/**
 * @author Laurent Petit
 */
public class ToggleNatureCommand extends AbstractHandler {

    public Object execute(ExecutionEvent event) throws ExecutionException {
        ISelection selection = HandlerUtil.getCurrentSelection(event);

        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, false);
                }
            }
        }

        return null;
    }

    public static void toggleNature(IProject project, boolean quiet) {
        final String title = "Change Clojure language support";
        String mess;

        try {
            boolean added = doToggleNature(project);
            mess = "Clojure language support successfully " + (added ? "added" : "removed") + " for project "
                    + project.getName() + ".";
        } catch (CoreException e) {
            mess = "Error while trying to toggle clojure language support for project " + project.getName() + ":";
            if (e.getMessage() != null) {
                mess += "\n\n" + e.getMessage();
            }
            CCWPlugin.logError(mess, e);
        }
        final String message = mess;

        if (quiet) {
            CCWPlugin.log(title + " : " + message);
        } else {
            DisplayUtil.asyncExec(new Runnable() {
                public void run() {
                    MessageDialog.openInformation(Display.getCurrent().getActiveShell(), title, message);
                }
            });
        }
    }

    /**
     * Toggles clojure nature on a project.
     * @return true if nature added, false if nature removed
     */
    private static boolean doToggleNature(IProject project) throws CoreException {
        IProjectDescription description = project.getDescription();
        String[] natures = description.getNatureIds();
        List<String> newNatures = new ArrayList<String>(natures.length + 1);

        boolean natureFound = false;
        for (String nature : natures) {
            if (nature.equals(ClojureCore.NATURE_ID)) {
                // remove it, that is do not add it to newNatures
                natureFound = true;
            } else {
                newNatures.add(nature);
            }
        }

        if (!natureFound) {
            // Nature not found, so add it
            newNatures.add(ClojureCore.NATURE_ID);
        }

        description.setNatureIds(newNatures.toArray(new String[0]));
        project.setDescription(description, null);

        return !natureFound;
    }

}