package org.eclipse.php.internal.debug.ui.actions;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.debug.core.model.IStackFrame;
import org.eclipse.debug.core.model.IThread;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.contexts.DebugContextEvent;
import org.eclipse.debug.ui.contexts.IDebugContextListener;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.php.internal.debug.ui.PHPDebugUIPlugin;
import org.eclipse.ui.*;
public class EvaluationContextManager implements IWindowListener,
IDebugContextListener {
private static EvaluationContextManager fgManager;
/**
* System property indicating a stack frame is selected in the debug view
* with an <code>IJavaStackFrame</code> adapter.
*/
private static final String DEBUGGER_ACTIVE = PHPDebugUIPlugin.ID
+ ".debuggerActive"; //$NON-NLS-1$
/**
* System property indicating an element is selected in the debug view that
* is an instanceof <code>IJavaStackFrame</code> or <code>IJavaThread</code>
* .
*/
// private static final String INSTANCE_OF_IJAVA_STACK_FRAME =
// PHPDebugUIPlugin.ID
// + ".instanceof.IJavaStackFrame";
/**
* System property indicating the frame in the debug view supports 'force
* return'
*/
// private static final String SUPPORTS_FORCE_RETURN = PHPDebugUIPlugin.ID
// + ".supportsForceReturn";
/**
* System property indicating whether the frame in the debug view supports
* instance and reference retrieval (1.5 VMs and later).
*/
// private static final String SUPPORTS_INSTANCE_RETRIEVAL =
// PHPDebugUIPlugin.ID
// + ".supportsInstanceRetrieval";
private Map fContextsByPage = null;
private IWorkbenchWindow fActiveWindow;
private EvaluationContextManager() {
DebugUITools.getDebugContextManager().addDebugContextListener(this);
}
public static void startup() {
Runnable r = new Runnable() {
public void run() {
if (fgManager == null) {
fgManager = new EvaluationContextManager();
IWorkbench workbench = PlatformUI.getWorkbench();
IWorkbenchWindow[] windows = workbench
.getWorkbenchWindows();
for (int i = 0; i < windows.length; i++) {
fgManager.windowOpened(windows[i]);
}
workbench.addWindowListener(fgManager);
fgManager.fActiveWindow = workbench
.getActiveWorkbenchWindow();
}
}
};
PHPDebugUIPlugin.getStandardDisplay().asyncExec(r);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.IWindowListener#windowActivated(org.eclipse.ui.
* IWorkbenchWindow)
*/
public void windowActivated(IWorkbenchWindow window) {
fActiveWindow = window;
}
/*
* (non-Javadoc)
*
* @see
* org.eclipse.ui.IWindowListener#windowClosed(org.eclipse.ui.IWorkbenchWindow
* )
*/
public void windowClosed(IWorkbenchWindow window) {
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.IWindowListener#windowDeactivated(org.eclipse.ui.
* IWorkbenchWindow)
*/
public void windowDeactivated(IWorkbenchWindow window) {
}
/*
* (non-Javadoc)
*
* @see
* org.eclipse.ui.IWindowListener#windowOpened(org.eclipse.ui.IWorkbenchWindow
* )
*/
public void windowOpened(IWorkbenchWindow window) {
}
/**
* Sets the evaluation context for the given page, and notes that a valid
* execution context exists.
*
* @param page
* @param frame
*/
private void setContext(IWorkbenchPage page, IStackFrame frame,
boolean instOf) {
if (fContextsByPage == null) {
fContextsByPage = new HashMap();
}
fContextsByPage.put(page, frame);
System.setProperty(DEBUGGER_ACTIVE, "true"); //$NON-NLS-1$
// if (frame.canForceReturn()) {
// System.setProperty(SUPPORTS_FORCE_RETURN, "true");
// } else {
// System.setProperty(SUPPORTS_FORCE_RETURN, "false");
// }
// if
// (((IJavaDebugTarget)frame.getDebugTarget()).supportsInstanceRetrieval()){
// System.setProperty(SUPPORTS_INSTANCE_RETRIEVAL, "true");
// } else {
// System.setProperty(SUPPORTS_INSTANCE_RETRIEVAL, "false");
// }
// if (instOf) {
// System.setProperty(INSTANCE_OF_IJAVA_STACK_FRAME, "true");
// } else {
// System.setProperty(INSTANCE_OF_IJAVA_STACK_FRAME, "false");
// }
}
/**
* Removes an evaluation context for the given page, and determines if any
* valid execution context remain.
*
* @param page
*/
private void removeContext(IWorkbenchPage page) {
if (fContextsByPage != null) {
fContextsByPage.remove(page);
// if (fContextsByPage.isEmpty()) {
// System.setProperty(DEBUGGER_ACTIVE, "false");
// System.setProperty(INSTANCE_OF_IJAVA_STACK_FRAME, "false");
// System.setProperty(SUPPORTS_FORCE_RETURN, "false");
// System.setProperty(SUPPORTS_INSTANCE_RETRIEVAL, "false");
// }
}
}
/**
* Returns the evaluation context for the given part, or <code>null</code>
* if none. The evaluation context corresponds to the selected stack frame
* in the following priority order:
* <ol>
* <li>stack frame in the same page</li>
* <li>stack frame in the same window</li>
* <li>stack frame in active page of other window</li>
* <li>stack frame in page of other windows</li>
* </ol>
*
* @param part
* the part that the evaluation action was invoked from
* @return the stack frame that supplies an evaluation context, or
* <code>null</code> if none
*/
public static IStackFrame getEvaluationContext(IWorkbenchPart part) {
IWorkbenchPage page = part.getSite().getPage();
IStackFrame frame = getContext(page);
if (frame == null) {
return getEvaluationContext(page.getWorkbenchWindow());
}
return frame;
}
private static IStackFrame getContext(IWorkbenchPage page) {
if (fgManager != null) {
if (fgManager.fContextsByPage != null) {
return (IStackFrame) fgManager.fContextsByPage.get(page);
}
}
return null;
}
/**
* Returns the evaluation context for the given window, or <code>null</code>
* if none. The evaluation context corresponds to the selected stack frame
* in the following priority order:
* <ol>
* <li>stack frame in active page of the window</li>
* <li>stack frame in another page of the window</li>
* <li>stack frame in active page of another window</li>
* <li>stack frame in a page of another window</li>
* </ol>
*
* @param window
* the window that the evaluation action was invoked from, or
* <code>null</code> if the current window should be consulted
* @return the stack frame that supplies an evaluation context, or
* <code>null</code> if none
* @return IJavaStackFrame
*/
public static IStackFrame getEvaluationContext(IWorkbenchWindow window) {
List alreadyVisited = new ArrayList();
if (window == null) {
window = fgManager.fActiveWindow;
}
return getEvaluationContext(window, alreadyVisited);
}
private static IStackFrame getEvaluationContext(IWorkbenchWindow window,
List alreadyVisited) {
IWorkbenchPage activePage = window.getActivePage();
IStackFrame frame = null;
if (activePage != null) {
frame = getContext(activePage);
}
if (frame == null) {
IWorkbenchPage[] pages = window.getPages();
for (int i = 0; i < pages.length; i++) {
if (activePage != pages[i]) {
frame = getContext(pages[i]);
if (frame != null) {
return frame;
}
}
}
alreadyVisited.add(window);
IWorkbenchWindow[] windows = PlatformUI.getWorkbench()
.getWorkbenchWindows();
for (int i = 0; i < windows.length; i++) {
if (!alreadyVisited.contains(windows[i])) {
frame = getEvaluationContext(windows[i], alreadyVisited);
if (frame != null) {
return frame;
}
}
}
return null;
}
return frame;
}
public void debugContextChanged(DebugContextEvent event) {
if ((event.getFlags() & DebugContextEvent.ACTIVATED) > 0) {
IWorkbenchPart part = event.getDebugContextProvider().getPart();
if (part != null) {
IWorkbenchPage page = part.getSite().getPage();
ISelection selection = event.getContext();
if (selection instanceof IStructuredSelection) {
IStructuredSelection ss = (IStructuredSelection) selection;
if (ss.size() == 1) {
Object element = ss.getFirstElement();
if (element instanceof IAdaptable) {
IStackFrame frame = (IStackFrame) ((IAdaptable) element)
.getAdapter(IStackFrame.class);
boolean instOf = element instanceof IStackFrame
|| element instanceof IThread;
if (frame != null) {
// do not consider scrapbook frames
// if
// (frame.getLaunch().getAttribute(ScrapbookLauncher.SCRAPBOOK_LAUNCH)
// == null) {
setContext(page, frame, instOf);
return;
// }
}
}
}
}
// no context in the given view
removeContext(page);
}
}
}
}