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/*******************************************************************************
* Copyright (c) 2000, 2005 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
*******************************************************************************/
package org.eclipse.cdt.debug.internal.ui.actions;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IAdapterManager;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IPartListener;
import org.eclipse.ui.IPartService;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.ui.texteditor.IUpdate;
/**
* Global retargettable debug action.
*
* @since 3.0
*/
public abstract class RetargetAction implements IWorkbenchWindowActionDelegate, IPartListener, IUpdate {
protected IWorkbenchWindow fWindow = null;
private IWorkbenchPart fActivePart = null;
private Object fTargetAdapter = null;
private IAction fAction = null;
private static final ISelection EMPTY_SELECTION = new EmptySelection();
static class EmptySelection implements ISelection {
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ISelection#isEmpty()
*/
public boolean isEmpty() {
return true;
}
}
/**
* Returns the current selection in the active part, possibly
* and empty selection, but never <code>null</code>.
*
* @return the selection in the active part, possibly empty
*/
private ISelection getTargetSelection() {
if (fActivePart != null) {
ISelectionProvider selectionProvider = fActivePart.getSite().getSelectionProvider();
if (selectionProvider != null) {
return selectionProvider.getSelection();
}
}
return EMPTY_SELECTION;
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWorkbenchWindowActionDelegate#dispose()
*/
public void dispose() {
fWindow.getPartService().removePartListener(this);
fActivePart = null;
fTargetAdapter = null;
}
/* (non-Javadoc)
* @see org.eclipse.ui.IWorkbenchWindowActionDelegate#init(org.eclipse.ui.IWorkbenchWindow)
*/
public void init(IWorkbenchWindow window) {
this.fWindow = window;
IPartService partService = window.getPartService();
partService.addPartListener(this);
IWorkbenchPart part = partService.getActivePart();
if (part != null) {
partActivated(part);
}
}
/* (non-Javadoc)
* @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
*/
public void run(IAction action) {
if (fTargetAdapter != null) {
try {
performAction(fTargetAdapter, getTargetSelection(), fActivePart);
} catch (CoreException e) {
ErrorDialog.openError(fWindow.getShell(), ActionMessages.getString("RetargetAction.2"), ActionMessages.getString("RetargetAction.3"), e.getStatus()); //$NON-NLS-1$ //$NON-NLS-2$
}
}
}
/**
* Performs the specific breakpoint toggling.
*
* @param selection selection in the active part
* @param part active part
* @throws CoreException if an exception occurrs
*/
protected abstract void performAction(Object target, ISelection selection, IWorkbenchPart part) throws CoreException;
/* (non-Javadoc)
* @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
*/
public void selectionChanged(IAction action, ISelection selection) {
this.fAction = action;
// if the active part did not provide an adapter, see if the selectoin does
if (fTargetAdapter == null && selection instanceof IStructuredSelection) {
IStructuredSelection ss = (IStructuredSelection) selection;
if (!ss.isEmpty()) {
Object object = ss.getFirstElement();
if (object instanceof IAdaptable) {
fTargetAdapter = getAdapter((IAdaptable) object);
}
}
}
update();
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener#partActivated(org.eclipse.ui.IWorkbenchPart)
*/
public void partActivated(IWorkbenchPart part) {
fActivePart = part;
fTargetAdapter = getAdapter(part);
update();
}
protected Object getAdapter(IAdaptable adaptable) {
Object adapter = adaptable.getAdapter(getAdapterClass());
if (adapter == null) {
IAdapterManager adapterManager = Platform.getAdapterManager();
if (adapterManager.hasAdapter(adaptable, getAdapterClass().getName())) {
fTargetAdapter = adapterManager.loadAdapter(adaptable, getAdapterClass().getName());
}
}
return adapter;
}
/**
* Returns the type of adapter (target) this action works on.
*
* @return the type of adapter this action works on
*/
protected abstract Class getAdapterClass();
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener#partBroughtToTop(org.eclipse.ui.IWorkbenchPart)
*/
public void partBroughtToTop(IWorkbenchPart part) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener#partClosed(org.eclipse.ui.IWorkbenchPart)
*/
public void partClosed(IWorkbenchPart part) {
clearPart(part);
}
/**
* Clears reference to active part and adapter when a relevant part
* is closed or deactivated.
*
* @param part workbench part that has been closed or deactivated
*/
protected void clearPart(IWorkbenchPart part) {
if (part.equals(fActivePart)) {
fActivePart = null;
fTargetAdapter = null;
}
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener#partDeactivated(org.eclipse.ui.IWorkbenchPart)
*/
public void partDeactivated(IWorkbenchPart part) {
clearPart(part);
}
/* (non-Javadoc)
* @see org.eclipse.ui.IPartListener#partOpened(org.eclipse.ui.IWorkbenchPart)
*/
public void partOpened(IWorkbenchPart part) {
}
/* (non-Javadoc)
* @see org.eclipse.ui.texteditor.IUpdate#update()
*/
public void update() {
if (fAction == null) {
return;
}
if (fTargetAdapter != null) {
fAction.setEnabled(canPerformAction(fTargetAdapter, getTargetSelection(), fActivePart));
} else {
fAction.setEnabled(false);
}
}
/**
* Returns whether the specific operation is supported.
*
* @param target the target adapter
* @param selection the selection to verify the operation on
* @param part the part the operation has been requested on
* @return whether the operation can be performed
*/
protected abstract boolean canPerformAction(Object target, ISelection selection, IWorkbenchPart part);
}
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