org.netxms.ui.eclipse.objectbrowser.widgets.internal.ObjectTreeViewer.java Source code

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Here is the source code for org.netxms.ui.eclipse.objectbrowser.widgets.internal.ObjectTreeViewer.java

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/**
 * NetXMS - open source network management system
 * Copyright (C) 2003-2012 Victor Kirhenshtein
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.netxms.ui.eclipse.objectbrowser.widgets.internal;

import org.eclipse.jface.viewers.IElementComparer;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.ViewerRow;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.TreeItem;
import org.netxms.client.objects.AbstractObject;

/**
 * Custom extension of tree viewer for object tree
 */
public class ObjectTreeViewer extends TreeViewer {
    /**
     * @param parent
     * @param style
     */
    public ObjectTreeViewer(Composite parent, int style) {
        super(parent, style);
        setComparer(new IElementComparer() {
            @Override
            public int hashCode(Object element) {
                return (element instanceof AbstractObject) ? (int) ((AbstractObject) element).getObjectId()
                        : element.hashCode();
            }

            @Override
            public boolean equals(Object a, Object b) {
                if ((a instanceof AbstractObject) && (b instanceof AbstractObject))
                    return ((AbstractObject) a).getObjectId() == ((AbstractObject) b).getObjectId();
                return a.equals(b);
            }
        });
    }

    /**
     * @param item
     * @return
     */
    public ViewerRow getTreeViewerRow(TreeItem item) {
        return getViewerRowFromItem(item);
    }

    /**
     * Toggle item's expanded/collapsed state
     * 
     * @param item
     */
    public void toggleItemExpandState(TreeItem item) {
        if (item.getExpanded()) {
            item.setExpanded(false);
        } else {
            createChildren(item);
            item.setExpanded(true);
        }
    }
}