org.eclipse.photran.ui.vpg/src/org/eclipse/photran/internal/ui/views/vpgproblems/VPGProblemContentProvider.java

/*******************************************************************************
 * Copyright (c) 2009 University of Illinois at Urbana-Champaign 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:
 *    UIUC - Initial API and implementation
 *******************************************************************************/
package org.eclipse.photran.internal.ui.views.vpgproblems;

import java.util.List;

import org.eclipse.core.resources.IMarker;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.Viewer;

/**
 * Content provider for the VPG Problems View.
 * <p>
 * Based on samples provided in Java DeveloperÕs Guide to Eclipse,
 * Chapter 18 (http://www.jdg2e.com/ch18.views/doc/index.htm);
 * © Copyright International Business Machines Corporation, 2003, 2004, 2006.
 * All Rights Reserved.
 * Code or samples provided therein are provided without warranty of any kind.
 *
 * @author Timofey Yuvashev
 */
public class VPGProblemContentProvider implements IStructuredContentProvider
{
    private StructuredViewer viewer = null;

    private List<IMarker> input = null;

    @SuppressWarnings("unchecked")
    public Object[] getElements(Object element)
    {
        List<IMarker> markers = (List<IMarker>)(element);
        return markers.toArray();
    }

    public void dispose()
    {
        if (this.input != null) input = null;
    }

    @SuppressWarnings("unchecked")
    public void inputChanged(Viewer v, Object oldInput, Object newInput)
    {
        if (this.viewer == null) this.viewer = (StructuredViewer)v;

        if (this.input == null && newInput != null) this.input = (List<IMarker>)newInput;

        if (newInput == null && input != null) input = null;
    }
}