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/*******************************************************************************
* Copyright (c) 2005, 2007 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
*******************************************************************************/
package org.eclipse.debug.examples.ui.pda.views;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IValue;
import org.eclipse.debug.examples.core.pda.model.PDADebugTarget;
import org.eclipse.debug.examples.ui.pda.DebugUIPlugin;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
/**
* Pops a selected value off the data stack. The selection does <b>not</b> have to be
* the top element on the stack.
*/
public class PopAction extends Action implements ISelectionChangedListener {
private DataStackView fView;
/**
* Constructs an action to pop values off the stack
*/
protected PopAction(DataStackView view) {
super("Pop");
ImageRegistry imageRegistry = DebugUIPlugin.getDefault().getImageRegistry();
setImageDescriptor(imageRegistry.getDescriptor(DebugUIPlugin.IMG_ELCL_POP));
setDisabledImageDescriptor(imageRegistry.getDescriptor(DebugUIPlugin.IMG_DLCL_POP));
setToolTipText("Pop");
setEnabled(false);
view.getSite().getSelectionProvider().addSelectionChangedListener(this);
fView = view;
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(org.eclipse.jface.viewers.SelectionChangedEvent)
*/
public void selectionChanged(SelectionChangedEvent event) {
if (event.getSelection().isEmpty()) {
setEnabled(false);
} else {
setEnabled(getDebugTarget().canPop());
}
}
public void run() {
TreeViewer viewer = (TreeViewer)fView.getViewer();
IStructuredSelection selection = (IStructuredSelection)viewer.getSelection();
Object popee = selection.getFirstElement();
try {
PDADebugTarget target = getDebugTarget();
IValue[] stack = target.getDataStack();
List restore = new ArrayList();
for (int i = 0; i < stack.length; i++) {
Object value = stack[i];
if (popee.equals(value)) {
// pop & stop
target.pop();
break;
} else {
// remember value to push back on
restore.add(target.pop());
}
}
while (!restore.isEmpty()) {
IValue value = (IValue) restore.remove(restore.size() - 1);
target.push(value.getValueString());
}
} catch (DebugException e) {
}
viewer.refresh();
}
/**
* Returns the debug target assocaited with the data view.
*
* @return the debug target assocaited with the data view
*/
protected PDADebugTarget getDebugTarget() {
TreeViewer viewer = (TreeViewer)fView.getViewer();
return (PDADebugTarget) viewer.getInput();
}
}
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