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package org.eclipse.debug.internal.ui;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
import org.eclipse.debug.core.DebugEvent;
import org.eclipse.jface.viewers.*;
import org.eclipse.swt.widgets.Control;
public abstract class BasicContentProvider implements IStructuredContentProvider {
protected StructuredViewer fViewer;
protected boolean fDisposed= false;
/**
* @see IContentProvider#dispose
*/
public void dispose() {
fDisposed= true;
}
/**
* Returns whether this content provider has already
* been disposed.
*/
protected boolean isDisposed() {
return fDisposed;
}
/**
* @see IContentProvider#inputChanged
*/
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
fViewer= (StructuredViewer) viewer;
}
/**
* @see Display.asyncExec(Runnable)
*/
protected void asyncExec(Runnable r) {
if (fViewer != null) {
Control ctrl= fViewer.getControl();
if (ctrl != null && !ctrl.isDisposed()) {
ctrl.getDisplay().asyncExec(r);
}
}
}
/**
* Refreshes the viewer - must be called in UI thread.
*/
protected void refresh() {
if (fViewer != null) {
fViewer.refresh();
}
}
/**
* Refresh the given element in the viewer - must be called in UI thread.
*/
protected void refresh(Object element) {
if (fViewer != null) {
fViewer.refresh(element);
}
}
/**
* @see IDebugEventListener
*/
public void handleDebugEvent(final DebugEvent event) {
if (fViewer == null) {
return;
}
Object element= event.getSource();
if (element == null) {
return;
}
Runnable r= new Runnable() {
public void run() {
if (!isDisposed()) {
doHandleDebugEvent(event);
}
}
};
asyncExec(r);
}
/**
* @see ITreeContentProvider
*/
public Object[] getChildren(final Object parent) {
return doGetChildren(parent);
}
/**
* Performs an update based on the event
*/
protected abstract void doHandleDebugEvent(DebugEvent event);
protected abstract Object[] doGetChildren(Object parent);
}
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