/**
* Constructor, initializes this value with its debug target and root object
*
* @param target The debug target associated with this value
* @param root The root object that the elements in the array refer to.
*/
public JDIReferenceListValue(IJavaObject root) {
super((JDIDebugTarget) root.getDebugTarget(), ((JDIObjectValue) root).getUnderlyingObject());
fRoot = root;
try {
IJavaType[] javaTypes =
((JDIDebugTarget) root.getDebugTarget())
.getJavaTypes("java.lang.Object[]"); // $NON-NLS-1$
if (javaTypes != null && javaTypes.length > 0) {
fType = javaTypes[0];
}
} catch (DebugException e) {
}
}
/** Re-enable garbage collection if interim results. */
private void releaseObjects() {
if (fPermStorage != null) {
Iterator<IJavaObject> iterator = fPermStorage.iterator();
while (iterator.hasNext()) {
IJavaObject object = iterator.next();
try {
object.enableCollection();
} catch (CoreException e) {
// don't worry about GC if the VM has terminated
if ((e.getStatus().getException() instanceof VMDisconnectedException)) {
break;
}
JDIDebugPlugin.log(e);
}
}
fPermStorage = null;
}
}
/**
* Avoid garbage collecting interim results.
*
* @param value object to disable garbage collection for
*/
private void disableCollection(IJavaObject value) {
if (fPermStorage == null) {
fPermStorage = new ArrayList<IJavaObject>(5);
}
try {
value.disableCollection();
fPermStorage.add(value);
} catch (CoreException e) {
JDIDebugPlugin.log(e);
}
}
/** @return all references to the root object as an array of IJavaObjects */
protected synchronized IJavaObject[] getReferences() {
try {
int max = HeapWalkingManager.getDefault().getAllReferencesMaxCount();
IJavaObject[] referringObjects = null;
fIsMoreThanPreference = false;
if (max == 0) {
referringObjects = fRoot.getReferringObjects(max);
} else {
referringObjects = fRoot.getReferringObjects(max + 1);
if (referringObjects.length > max) {
fIsMoreThanPreference = true;
referringObjects[max] =
new JDIPlaceholderValue(
(JDIDebugTarget) fRoot.getDebugTarget(),
MessageFormat.format(
JDIDebugModelMessages.JDIReferenceListValue_9, Integer.toString(max)));
}
}
return referringObjects;
} catch (DebugException e) {
JDIDebugPlugin.log(e);
return new IJavaObject[0];
}
}
/**
* Update the information for this thread.
*
* @return <code>true</code> if the contended monitor or the owned monitors changed.
*/
private boolean update() {
boolean changed = false;
synchronized (this) {
if (!fToUpdate) {
return false;
}
try {
// update the contended monitor
IJavaObject contendedMonitor = fThread.getContendedMonitor();
if (contendedMonitor == null) {
changed = fContendedMonitor != null;
fContendedMonitor = null;
} else {
changed =
fContendedMonitor == null || !contendedMonitor.equals(fContendedMonitor.getMonitor());
fContendedMonitor = ThreadMonitorManager.getDefault().getJavaMonitor(contendedMonitor);
}
// update the owned monitors
IJavaObject[] ownedMonitors = fThread.getOwnedMonitors();
if (ownedMonitors == null || ownedMonitors.length == 0) {
// no owned monitor, not much to do
changed = fOwnedMonitors != null && fOwnedMonitors.length != 0;
fOwnedMonitors = new JavaMonitor[0];
} else {
JavaMonitor[] tmp = new JavaMonitor[ownedMonitors.length];
ThreadMonitorManager threadMonitorManager = ThreadMonitorManager.getDefault();
if (changed || fOwnedMonitors.length != ownedMonitors.length) {
// if we know it changed, we can just create the new list.
for (int i = 0; i < ownedMonitors.length; i++) {
tmp[i] = threadMonitorManager.getJavaMonitor(ownedMonitors[i]);
}
changed = true;
} else {
// we need to check in the new list contains the same monitors as the
// previous list
int sameMonitor = 0;
for (int i = 0; i < ownedMonitors.length; i++) {
for (int j = 0; j < fOwnedMonitors.length; j++) {
if (ownedMonitors[i].equals(fOwnedMonitors[i].getMonitor())) {
sameMonitor++;
break;
}
}
tmp[i] = threadMonitorManager.getJavaMonitor(ownedMonitors[i]);
}
changed = sameMonitor != ownedMonitors.length;
}
fOwnedMonitors = tmp;
}
} catch (DebugException e) {
Throwable cause = e.getStatus().getException();
if (!(cause instanceof IncompatibleThreadStateException)) {
// IncompatibleThreadStateException are expected from Sun VMs
// if the thread is not suspended.
// For all other exceptions, null the values.
fContendedMonitor = null;
changed = fOwnedMonitors != null && fOwnedMonitors.length != 0;
fOwnedMonitors = new JavaMonitor[0];
}
} finally {
fToUpdate = false;
}
}
if (changed) {
fireChangeEvent(DebugEvent.CONTENT);
}
return changed;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jdt.internal.debug.core.model.JDIValue#hashCode()
*/
@Override
public int hashCode() {
return getClass().hashCode() + fRoot.hashCode();
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jdt.internal.debug.core.model.JDIValue#isAllocated()
*/
@Override
public boolean isAllocated() throws DebugException {
return fRoot.isAllocated();
}