org.eclipse.debug.examples.ui.pda.views.DataStackView.java Source code

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Here is the source code for org.eclipse.debug.examples.ui.pda.views.DataStackView.java

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/*******************************************************************************
 * Copyright (c) 2005, 2010 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *     Bjorn Freeman-Benson - initial API and implementation
 *     Wind River - Pawel Piech - replaced actions with handlers (bug 229219)
 *     Pawel Piech (Wind River) - ported PDA Virtual Machine to Java (Bug 261400)
******************************************************************************/
package org.eclipse.debug.examples.ui.pda.views;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.examples.core.pda.model.PDAStackFrame;
import org.eclipse.debug.examples.core.pda.model.PDAThread;
import org.eclipse.debug.ui.AbstractDebugView;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.contexts.DebugContextEvent;
import org.eclipse.debug.ui.contexts.IDebugContextListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.jface.action.Separator;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.IWorkbenchActionConstants;
import org.eclipse.ui.progress.UIJob;

/**
 * View of the PDA VM data stack 
 */
public class DataStackView extends AbstractDebugView implements IDebugContextListener {

    private PDAThread fThread;

    class StackViewContentProvider implements ITreeContentProvider {

        /* (non-Javadoc)
         * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
         */
        public Object[] getChildren(Object parentElement) {
            if (parentElement instanceof PDAThread) {
                try {
                    return ((PDAThread) parentElement).getDataStack();
                } catch (DebugException e) {
                }
            }
            return new Object[0];
        }

        /* (non-Javadoc)
         * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
         */
        public Object getParent(Object element) {
            if (element instanceof PDAThread) {
                return null;
            } else {
                return fThread;
            }
        }

        /* (non-Javadoc)
         * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
         */
        public boolean hasChildren(Object element) {
            return element instanceof PDAThread;
        }

        /* (non-Javadoc)
         * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
         */
        public Object[] getElements(Object inputElement) {
            return getChildren(inputElement);
        }

        /* (non-Javadoc)
         * @see org.eclipse.jface.viewers.IContentProvider#dispose()
         */
        public void dispose() {
        }

        /* (non-Javadoc)
         * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
         */
        public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
        }

    }

    /* (non-Javadoc)
     * @see org.eclipse.debug.ui.AbstractDebugView#createViewer(org.eclipse.swt.widgets.Composite)
     */
    protected Viewer createViewer(Composite parent) {
        TreeViewer viewer = new TreeViewer(parent);
        viewer.setLabelProvider(DebugUITools.newDebugModelPresentation());
        viewer.setContentProvider(new StackViewContentProvider());
        DebugUITools.getDebugContextManager().getContextService(getSite().getWorkbenchWindow())
                .addDebugContextListener(this);
        getSite().setSelectionProvider(viewer);
        return viewer;
    }

    /* (non-Javadoc)
     * @see org.eclipse.debug.ui.AbstractDebugView#createActions()
     */
    protected void createActions() {
    }

    /* (non-Javadoc)
     * @see org.eclipse.debug.ui.AbstractDebugView#getHelpContextId()
     */
    protected String getHelpContextId() {
        return null;
    }

    /* (non-Javadoc)
     * @see org.eclipse.debug.ui.AbstractDebugView#fillContextMenu(org.eclipse.jface.action.IMenuManager)
     */
    protected void fillContextMenu(IMenuManager menu) {
        menu.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS));
    }

    /* (non-Javadoc)
     * @see org.eclipse.debug.ui.AbstractDebugView#configureToolBar(org.eclipse.jface.action.IToolBarManager)
     */
    protected void configureToolBar(IToolBarManager tbm) {
    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.IWorkbenchPart#dispose()
     */
    public void dispose() {
        DebugUITools.getDebugContextManager().getContextService(getSite().getWorkbenchWindow())
                .removeDebugContextListener(this);
        super.dispose();
    }

    public void debugContextChanged(final DebugContextEvent event) {
        new UIJob(getSite().getShell().getDisplay(), "DataStackView update") {
            {
                setSystem(true);
            }

            public IStatus runInUIThread(IProgressMonitor monitor) {
                if (getViewer() != null) { // runs asynchronously, view may be disposed
                    update(event.getContext());
                }
                return Status.OK_STATUS;
            }
        }.schedule();
    }

    /**
     * Updates the view for the selected thread (if suspended)
     */
    private void update(ISelection context) {
        fThread = null;

        if (context instanceof IStructuredSelection) {
            Object element = ((IStructuredSelection) context).getFirstElement();
            if (element instanceof PDAThread) {
                fThread = (PDAThread) element;
            } else if (element instanceof PDAStackFrame) {
                fThread = (PDAThread) ((PDAStackFrame) element).getThread();
            }
        }
        Object input = null;
        if (fThread != null && fThread.isSuspended()) {
            input = fThread;
        }
        getViewer().setInput(input);
        getViewer().refresh();
    }
}