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Bug 310331 - [vm] Refactor VMViewerUpdate to avoid data duplication.

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This commit is contained in:
Pawel Piech 2010-04-23 19:27:29 +00:00
parent fb54796aac
commit ecdf96f548
1 changed files with 74 additions and 68 deletions
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142
dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/VMViewerUpdate.java
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@ -12,7 +12,6 @@ package org.eclipse.cdt.dsf.ui.viewmodel;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicBoolean;
import org.eclipse.cdt.dsf.concurrent.DsfExecutable;
@ -52,31 +51,69 @@ public class VMViewerUpdate extends DsfExecutable implements IViewerUpdate {
final private IViewerUpdate fClientUpdate;
/**
* The flag indicating whether this update was cancelled. This flag is not used
* if the {@link #fClientUpdate} is initialized.
* Place holder for the client update. It is only used if the client update is
* not specified.
*/
final private AtomicBoolean fCanceled;
/**
* The viewer input object for this update.
*/
final private Object fViewerInput;
/**
* The element object of this update.
*/
final private Object fElement;
/**
* The element path of this update.
*/
final private TreePath fElementPath;
/**
* The presentation context of this update.
*/
final private IPresentationContext fPresentationContext;
private class ClientUpdatePlaceHolder implements IViewerUpdate {
ClientUpdatePlaceHolder(TreePath elementPath, Object viewerInput, IPresentationContext presentationContext)
{
fViewerInput = viewerInput;
fElementPath = elementPath;
fPresentationContext = presentationContext;
}
/**
* The flag indicating whether this update was cancelled. This flag is not used
* if the {@link #fClientUpdate} is initialized.
*/
final private AtomicBoolean fCanceled = new AtomicBoolean(false);
/**
* The viewer input object for this update.
*/
final private Object fViewerInput;
/**
* The element path of this update.
*/
final private TreePath fElementPath;
/**
* The presentation context of this update.
*/
final private IPresentationContext fPresentationContext;
public void cancel() {
fCanceled.set(true);
}
public boolean isCanceled() {
return fCanceled.get();
}
public IPresentationContext getPresentationContext() {
return fPresentationContext;
}
public Object getElement() {
return fElementPath.getSegmentCount() != 0 ? fElementPath.getLastSegment() : fViewerInput;
}
public TreePath getElementPath() {
return fElementPath;
}
public Object getViewerInput() {
return fViewerInput;
}
public void done() { assert false; } // not used
public void setStatus(IStatus status) {assert false; } // not used
public IStatus getStatus() { assert false; return null; } // not used
}
/**
* Creates a viewer update based on a higher-level update. The update element
* information as well as cancel requests are delegated to the given client
@ -90,13 +127,8 @@ public class VMViewerUpdate extends DsfExecutable implements IViewerUpdate {
* @param requestMonitor Call-back invoked when this update completes.
*/
public VMViewerUpdate(IViewerUpdate clientUpdate, RequestMonitor requestMonitor) {
fViewerInput = clientUpdate.getViewerInput();
fElement = clientUpdate.getElement();
fElementPath = clientUpdate.getElementPath();
fPresentationContext = clientUpdate.getPresentationContext();
fRequestMonitor = requestMonitor;
fClientUpdate = clientUpdate;
fCanceled = null;
}
/**
@ -115,14 +147,9 @@ public class VMViewerUpdate extends DsfExecutable implements IViewerUpdate {
listDelta = listDelta.getParentDelta();
elementList.add(0, listDelta.getElement());
}
fViewerInput = elementList.get(0);
fElement = elementList.get(elementList.size() - 1);
elementList.remove(0);
fElementPath = new TreePath(elementList.toArray());
fPresentationContext = presentationContext;
fClientUpdate = new ClientUpdatePlaceHolder(
new TreePath(elementList.toArray()), elementList.get(elementList.size() - 1), presentationContext);
fRequestMonitor = requestMonitor;
fClientUpdate = null;
fCanceled = new AtomicBoolean(false);
}
/**
@ -134,56 +161,35 @@ public class VMViewerUpdate extends DsfExecutable implements IViewerUpdate {
* @param requestMonitor Call-back invoked when this update completes.
*/
public VMViewerUpdate(TreePath elementPath, Object viewerInput, IPresentationContext presentationContext, RequestMonitor requestMonitor) {
fViewerInput = viewerInput;
fElement = elementPath.getSegmentCount() != 0 ? elementPath.getLastSegment() : viewerInput;
fElementPath = elementPath;
fPresentationContext = presentationContext;
fRequestMonitor = requestMonitor;
fClientUpdate = null;
fCanceled = new AtomicBoolean(false);
fClientUpdate = new ClientUpdatePlaceHolder(elementPath, viewerInput, presentationContext);
}
protected RequestMonitor getRequestMonitor() {
return fRequestMonitor;
}
public Object getViewerInput() { return fViewerInput; }
public Object getElement() { return fElement; }
public TreePath getElementPath() { return fElementPath; }
public IPresentationContext getPresentationContext() { return fPresentationContext; }
public Object getViewerInput() { return fClientUpdate.getViewerInput(); }
public Object getElement() { return fClientUpdate.getElement(); }
public TreePath getElementPath() { return fClientUpdate.getElementPath(); }
public IPresentationContext getPresentationContext() { return fClientUpdate.getPresentationContext(); }
public IStatus getStatus() { return fRequestMonitor.getStatus(); }
public void setStatus(IStatus status) { fRequestMonitor.setStatus(status); }
public boolean isCanceled() {
if (fClientUpdate != null) {
return fClientUpdate.isCanceled();
} else {
return fCanceled.get();
}
return fClientUpdate.isCanceled();
}
public void cancel() {
if (fClientUpdate != null) {
fClientUpdate.cancel();
} else {
fCanceled.set(true);
}
fClientUpdate.cancel();
}
public void done() {
setSubmitted();
try {
if ( isCanceled() ) {
fRequestMonitor.cancel();
fRequestMonitor.setStatus(new Status( IStatus.CANCEL, DsfUIPlugin.PLUGIN_ID," Update was cancelled") ); //$NON-NLS-1$
}
fRequestMonitor.done();
} catch (RejectedExecutionException e) {
// If the request monitor cannot be invoked still, try to complete the update to avoid
// leaving the viewer in an inconsistent state.
if (fClientUpdate != null) {
fClientUpdate.done();
}
if ( isCanceled() ) {
fRequestMonitor.cancel();
fRequestMonitor.setStatus(new Status( IStatus.CANCEL, DsfUIPlugin.PLUGIN_ID," Update was cancelled") ); //$NON-NLS-1$
}
fRequestMonitor.done();
}
}