ca.uvic.chisel.javasketch.ui.internal.presentation.BreadCrumbHook.java Source code

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Here is the source code for ca.uvic.chisel.javasketch.ui.internal.presentation.BreadCrumbHook.java

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/*******************************************************************************
 * Copyright (c) 2009 the CHISEL group and contributors.
 * 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:
 *     Del Myers - initial API and implementation
 *******************************************************************************/
package ca.uvic.chisel.javasketch.ui.internal.presentation;

import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.zest.custom.uml.viewers.BreadCrumbViewer;
import org.eclipse.zest.custom.uml.viewers.ISequenceViewerListener;
import org.eclipse.zest.custom.uml.viewers.SequenceViewerEvent;
import org.eclipse.zest.custom.uml.viewers.SequenceViewerGroupEvent;
import org.eclipse.zest.custom.uml.viewers.SequenceViewerRootEvent;
import org.eclipse.zest.custom.uml.viewers.UMLSequenceViewer;

import ca.uvic.chisel.javasketch.data.model.IActivation;
import ca.uvic.chisel.javasketch.data.model.ICall;
import ca.uvic.chisel.javasketch.data.model.IThread;

/**
 * A hook between a breadcrumb viewer and 
 * @author Del Myers
 *
 */
class BreadCrumbHook implements ISelectionChangedListener, ISequenceViewerListener {

    private UMLSequenceViewer viewer;
    private BreadCrumbViewer breadcrumb;

    /**
     * @param breadcrumb
     * @param viewer
     */
    public BreadCrumbHook(BreadCrumbViewer breadcrumb, UMLSequenceViewer viewer) {
        this.viewer = viewer;
        this.breadcrumb = breadcrumb;
        breadcrumb.addSelectionChangedListener(this);
        viewer.addSequenceListener(this);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
     */
    @Override
    public void selectionChanged(SelectionChangedEvent event) {
        if (event.getSelection() instanceof IStructuredSelection) {
            IStructuredSelection ss = (IStructuredSelection) event.getSelection();
            Object element = ss.getFirstElement();
            IActivation newRoot = null;
            if (element instanceof ICall) {
                try {
                    if (((ICall) element).getActivation() != null) {
                        newRoot = ((ICall) element).getTarget().getActivation();
                    }
                } catch (NullPointerException e) {
                }
            }
            if (newRoot == null) {
                newRoot = ((IThread) viewer.getInput()).getRoot().getActivation();
            }
            viewer.setRootActivation(newRoot);
        }

    }

    /* (non-Javadoc)
     * @see org.eclipse.zest.custom.uml.viewers.ISequenceViewerListener#elementCollapsed(org.eclipse.zest.custom.uml.viewers.SequenceViewerEvent)
     */
    @Override
    public void elementCollapsed(SequenceViewerEvent event) {
    }

    /* (non-Javadoc)
     * @see org.eclipse.zest.custom.uml.viewers.ISequenceViewerListener#elementExpanded(org.eclipse.zest.custom.uml.viewers.SequenceViewerEvent)
     */
    @Override
    public void elementExpanded(SequenceViewerEvent event) {
    }

    /* (non-Javadoc)
     * @see org.eclipse.zest.custom.uml.viewers.ISequenceViewerListener#groupCollapsed(org.eclipse.zest.custom.uml.viewers.SequenceViewerGroupEvent)
     */
    @Override
    public void groupCollapsed(SequenceViewerGroupEvent event) {
    }

    /* (non-Javadoc)
     * @see org.eclipse.zest.custom.uml.viewers.ISequenceViewerListener#groupExpanded(org.eclipse.zest.custom.uml.viewers.SequenceViewerGroupEvent)
     */
    @Override
    public void groupExpanded(SequenceViewerGroupEvent event) {
    }

    /* (non-Javadoc)
     * @see org.eclipse.zest.custom.uml.viewers.ISequenceViewerListener#rootChanged(org.eclipse.zest.custom.uml.viewers.SequenceViewerRootEvent)
     */
    @Override
    public void rootChanged(SequenceViewerRootEvent event) {
        if (viewer.getRootActivation() != null && !viewer.getRootActivation().equals(breadcrumb.getInput())) {
            try {
                breadcrumb.setInput(((IActivation) viewer.getRootActivation()).getArrival().getOrigin());
            } catch (NullPointerException e) {
                breadcrumb.setInput(null);
            }
        }
    }

}