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package org.eclipse.debug.internal.ui.views.variables;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved.
*/
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IStackFrame;
import org.eclipse.debug.core.model.IValue;
import org.eclipse.debug.core.model.IVariable;
import org.eclipse.debug.internal.ui.DebugUIPlugin;
import org.eclipse.debug.internal.ui.views.IDebugExceptionHandler;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
/**
* Provide the contents for a variables viewer.
*/
public class VariablesViewContentProvider implements ITreeContentProvider {
/**
* A table that maps children to their parent element
* such that this content provider can walk back up the
* parent chain (since values do not know their
* parent).
* Map of <code>IVariable</code> (child) -> <code>IVariable</code> (parent).
*/
private HashMap fParentCache;
/**
* Handler for exceptions as content is retrieved
*/
private IDebugExceptionHandler fExceptionHandler = null;
/**
* Constructs a new provider
*/
public VariablesViewContentProvider() {
fParentCache = new HashMap(10);
}
/**
* @see ITreeContentProvider#getChildren(Object)
*/
public Object[] getChildren(Object parent) {
Object[] children= null;
try {
if (parent instanceof IStackFrame) {
children = ((IStackFrame)parent).getVariables();
} else if (parent instanceof IVariable) {
children = ((IVariable)parent).getValue().getVariables();
}
if (children != null) {
cache(parent, children);
return children;
}
} catch (DebugException e) {
if (getExceptionHandler() != null) {
getExceptionHandler().handleException(e);
} else {
DebugUIPlugin.log(e);
}
}
return new Object[0];
}
/**
* Returns the <code>IVariable</code>s for the given <code>IDebugElement</code>.
*/
public Object[] getElements(Object parent) {
return getChildren(parent);
}
/**
* Caches the given elememts as children of the given
* parent.
*
* @param parent parent element
* @param children children elements
*/
protected void cache(Object parent, Object[] children) {
for (int i = 0; i < children.length; i++) {
fParentCache.put(children[i], parent);
}
}
/**
* @see ITreeContentProvider#getParent(Object)
*/
public Object getParent(Object item) {
return fParentCache.get(item);
}
/**
* Unregisters this content provider from the debug plugin so that
* this object can be garbage-collected.
*/
public void dispose() {
fParentCache= null;
setExceptionHandler(null);
}
protected void clearCache() {
if (fParentCache != null) {
fParentCache.clear();
}
}
/**
* Remove the cached parent for the given children
*
* @param children for which to remove cached parents
*/
public void removeCache(Object[] children) {
if (fParentCache == null) {
return;
}
for (int i = 0; i < children.length; i++) {
fParentCache.remove(children[i]);
}
}
/**
* @see ITreeContentProvider#hasChildren(Object)
*/
public boolean hasChildren(Object element) {
try {
if (element instanceof IVariable) {
IValue v = ((IVariable)element).getValue();
return v != null && v.hasVariables();
}
if (element instanceof IValue) {
return ((IValue)element).hasVariables();
}
if (element instanceof IStackFrame) {
return ((IStackFrame)element).hasVariables();
}
} catch (DebugException e) {
DebugUIPlugin.log(e);
return false;
}
return false;
}
/**
* @see IContentProvider#inputChanged(Viewer, Object, Object)
*/
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
clearCache();
}
/**
* Return all cached decendants of the given parent.
*
* @param parent the element whose decendants are to be calculated
* @return list of decendants that have been cached for
* the given parent
*/
public List getCachedDecendants(Object parent) {
Iterator children = fParentCache.keySet().iterator();
List cachedChildren = new ArrayList(10);
while (children.hasNext()) {
Object child = children.next();
if (isCachedDecendant(child, parent)) {
cachedChildren.add(child);
}
}
return cachedChildren;
}
/**
* Returns whether the given child is a cached descendant
* of the given parent.
*
* @return whether the given child is a cached descendant
* of the given parent
*/
protected boolean isCachedDecendant(Object child, Object parent) {
Object p = getParent(child);
while (p != null) {
if (p.equals(parent)) {
return true;
}
p = getParent(p);
}
return false;
}
/**
* Sets an exception handler for this content provider.
*
* @param handler debug exception handler or <code>null</code>
*/
protected void setExceptionHandler(IDebugExceptionHandler handler) {
fExceptionHandler = handler;
}
/**
* Returns the exception handler for this content provider.
*
* @return debug exception handler or <code>null</code>
*/
protected IDebugExceptionHandler getExceptionHandler() {
return fExceptionHandler;
}
}
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