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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.debug.core.model.IStackFrame;
import org.eclipse.debug.core.model.IThread;
import org.eclipse.debug.core.model.IValue;
import org.eclipse.debug.internal.core.ListenerList;
import org.eclipse.debug.ui.IDebugEditorPresentation;
import org.eclipse.debug.ui.IDebugModelPresentation;
import org.eclipse.debug.ui.IValueDetailListener;
import org.eclipse.jface.text.source.SourceViewerConfiguration;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
/**
* A proxy to an IDebugModelPresentation extension. Instantiates the extension
* when it is needed.
*/
public class LazyModelPresentation implements IDebugModelPresentation, IDebugEditorPresentation {
/**
* A temporary mapping of attribute ids to their values
* @see IDebugModelPresentation#setAttribute
*/
protected HashMap fAttributes= new HashMap(3);
/**
* The config element that defines the extension
*/
protected IConfigurationElement fConfig = null;
/**
* The actual presentation instance - null until called upon
*/
protected IDebugModelPresentation fPresentation = null;
/**
* Temp holding for listeners - we do not add to presentation until
* it needs to be instantiated.
*/
protected ListenerList fListeners= new ListenerList(5);
/* (non-Javadoc)
* @see org.eclipse.debug.ui.IDebugEditorPresentation#removeAnntations(org.eclipse.ui.IEditorPart, org.eclipse.debug.core.model.IThread)
*/
public void removeAnnotations(IEditorPart editorPart, IThread thread) {
IDebugModelPresentation presentation = getPresentation();
if (presentation instanceof IDebugEditorPresentation) {
((IDebugEditorPresentation)presentation).removeAnnotations(editorPart, thread);
}
}
/* (non-Javadoc)
* @see org.eclipse.debug.ui.IDebugEditorPresentation#addAnnotations(org.eclipse.ui.IEditorPart, org.eclipse.debug.core.model.IStackFrame)
*/
public boolean addAnnotations(IEditorPart editorPart, IStackFrame frame) {
IDebugModelPresentation presentation = getPresentation();
if (presentation instanceof IDebugEditorPresentation) {
return ((IDebugEditorPresentation)presentation).addAnnotations(editorPart, frame);
}
return false;
}
/**
* Constructs a lazy presentation from the config element.
*/
public LazyModelPresentation(IConfigurationElement configElement) {
fConfig = configElement;
}
/**
* @see IDebugModelPresentation#getImage(Object)
*/
public Image getImage(Object element) {
return getPresentation().getImage(element);
}
/**
* @see IDebugModelPresentation#getText(Object)
*/
public String getText(Object element) {
return getPresentation().getText(element);
}
/**
* @see IDebugModelPresentation#computeDetail(IValue, IValueDetailListener)
*/
public void computeDetail(IValue value, IValueDetailListener listener) {
getPresentation().computeDetail(value, listener);
}
/**
* @see ISourcePresentation#getEditorInput(Object)
*/
public IEditorInput getEditorInput(Object element) {
return getPresentation().getEditorInput(element);
}
/**
* @see ISourcePresentation#getEditorId(IEditorInput, Object)
*/
public String getEditorId(IEditorInput input, Object inputObject) {
return getPresentation().getEditorId(input, inputObject);
}
/**
* @see IBaseLabelProvider#addListener(ILabelProviderListener)
*/
public void addListener(ILabelProviderListener listener) {
if (fPresentation != null) {
getPresentation().addListener(listener);
}
fListeners.add(listener);
}
/**
* @see IBaseLabelProvider#dispose()
*/
public void dispose() {
if (fPresentation != null) {
getPresentation().dispose();
}
fListeners = null;
}
/**
* @see IBaseLabelProvider#isLabelProperty(Object, String)
*/
public boolean isLabelProperty(Object element, String property) {
if (fPresentation != null) {
return getPresentation().isLabelProperty(element, property);
}
return false;
}
/**
* @see IBaseLabelProvider#removeListener(ILabelProviderListener)
*/
public void removeListener(ILabelProviderListener listener) {
if (fPresentation != null) {
getPresentation().removeListener(listener);
}
fListeners.remove(listener);
}
/**
* Returns the real presentation, instantiating if required.
*/
protected IDebugModelPresentation getPresentation() {
if (fPresentation == null) {
try {
fPresentation= (IDebugModelPresentation) DebugUIPlugin.createExtension(fConfig, "class"); //$NON-NLS-1$
// configure it
if (fListeners != null) {
Object[] list = fListeners.getListeners();
for (int i= 0; i < list.length; i++) {
fPresentation.addListener((ILabelProviderListener)list[i]);
}
}
Iterator keys= fAttributes.keySet().iterator();
while (keys.hasNext()) {
String key= (String)keys.next();
fPresentation.setAttribute(key, fAttributes.get(key));
}
} catch (CoreException e) {
DebugUIPlugin.log(e);
}
}
return fPresentation;
}
/**
* @see IDebugModelPresentation#setAttribute(String, Object)
*/
public void setAttribute(String id, Object value) {
if (value == null) {
return;
}
if (fPresentation != null) {
getPresentation().setAttribute(id, value);
}
fAttributes.put(id, value);
}
/**
* Returns the identifier of the debug model this
* presentation is registered for.
*/
public String getDebugModelIdentifier() {
return fConfig.getAttribute("id"); //$NON-NLS-1$
}
/**
* Returns a new source viewer configuration for the details
* area of the variables view, or <code>null</code> if
* unspecified.
*
* @return source viewer configuration or <code>null</code>
* @exception CoreException if unable to create the specified
* source viewer configuration
*/
public SourceViewerConfiguration newDetailsViewerConfiguration() throws CoreException {
String attr = fConfig.getAttribute("detailsViewerConfiguration"); //$NON-NLS-1$
if (attr != null) {
return (SourceViewerConfiguration)fConfig.createExecutableExtension("detailsViewerConfiguration"); //$NON-NLS-1$
}
return null;
}
/**
* Returns a copy of the attributes in this model presentation.
*
* @return a copy of the attributes in this model presentation
* @since 3.0
*/
public Map getAttributeMap() {
return (Map) fAttributes.clone();
}
}
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