org.polymap.core.operation.actions.SaveChangesAction.java Source code

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Here is the source code for org.polymap.core.operation.actions.SaveChangesAction.java

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/* 
 * polymap.org
 * Copyright 2009, Polymap GmbH, and individual contributors as indicated
 * by the @authors tag.
 *
 * This 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.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 *
 * $Id$
 */
package org.polymap.core.operation.actions;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.eclipse.swt.graphics.Image;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.DecorationOverlayIcon;
import org.eclipse.jface.viewers.IDecoration;
import org.eclipse.jface.viewers.ISelection;

import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

import org.eclipse.core.commands.operations.IOperationHistoryListener;
import org.eclipse.core.commands.operations.OperationHistoryEvent;

import org.polymap.core.CorePlugin;
import org.polymap.core.operation.OperationSupport;
import org.polymap.core.runtime.Polymap;
import org.polymap.core.workbench.PolymapWorkbench;

/**
 * 
 *
 * @author <a href="http://www.polymap.de">Falko Braeutigam</a>
 * @version POLYMAP3 ($Revision$)
 * @since 3.0
 */
public class SaveChangesAction implements IWorkbenchWindowActionDelegate, IOperationHistoryListener {

    private static Log log = LogFactory.getLog(SaveChangesAction.class);

    /** The action we are working for. Can I just store this and use in modelChanged() ? */
    private IAction action;

    private OperationSupport operationSupport;

    private static ImageDescriptor origImage = CorePlugin.getDefault().imageDescriptor("icons/etool16/save.gif");

    public void init(IWorkbenchWindow window) {
        operationSupport = OperationSupport.instance();
        operationSupport.addOperationHistoryListener(this);
    }

    public void dispose() {
        operationSupport.removeOperationHistoryListener(this);

    }

    public void historyNotification(OperationHistoryEvent ev) {
        log.debug("History changed: ev= " + ev);

        if (action != null) {
            Polymap.getSessionDisplay().asyncExec(new Runnable() {
                public void run() {
                    if (operationSupport.undoHistorySize() > 0) {
                        Image image = CorePlugin.getDefault().imageForDescriptor(origImage, "_saveActionOrig");
                        ImageDescriptor ovr = CorePlugin.getDefault().imageDescriptor("icons/ovr16/dirty_ovr2.png");
                        action.setImageDescriptor(new DecorationOverlayIcon(image, ovr, IDecoration.BOTTOM_RIGHT));
                        //action.setToolTipText( "Operations: " + operationSupport.undoHistorySize() );
                    } else {
                        action.setImageDescriptor(origImage);
                        //action.setToolTipText( "Save (including open editors)" );                        
                    }
                }
            });
        }
    }

    public void run(IAction _action) {
        try {
            operationSupport.saveChanges();
        } catch (Throwable e) {
            PolymapWorkbench.handleError(CorePlugin.PLUGIN_ID, this, e.getLocalizedMessage(), e);
        }
    }

    public void selectionChanged(IAction _action, ISelection _selection) {
        this.action = _action;
    }

}