| 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; |
| } |
| } |
| |