/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.source;
import org.eclipse.jface.text.Position;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* Specification of changes applied to annotation models. The event carries the
* changed annotation model as well as added, removed, and modified annotations.
* <p>
* An event can be sealed. Afterwards it can not be modified. Thus, the normal
* process is that an empty event is created, filled with the changed
* information, and before it is sent to the listeners, the event is sealed.
*
* @see org.eclipse.jface.text.source.IAnnotationModel
* @see org.eclipse.jface.text.source.IAnnotationModelListenerExtension
* @since 2.0
*/
public class AnnotationModelEvent {
/** The model this event refers to. */
private IAnnotationModel fAnnotationModel;
/**
* The added annotations.
* @since 3.0
*/
private Set fAddedAnnotations= new HashSet();
/**
* The removed annotations.
* @since 3.0
*/
private Map fRemovedAnnotations= new HashMap();
/**
* The changed annotations.
* @since 3.0
*/
private Set fChangedAnnotations= new HashSet();
/**
* Indicates that this event does not contain detailed information.
* @since 3.0
*/
private boolean fIsWorldChange;
/**
* The modification stamp.
* @since 3.0
*/
private Object fModificationStamp;
/**
* Creates a new annotation model event for the given model.
*
* @param model the model
*/
public AnnotationModelEvent(IAnnotationModel model) {
this(model, true);
}
/**
* Creates a new annotation model event for the given model.
*
* @param model the model
* @param isWorldChange <code>true</code> if world change
* @since 3.0
*/
public AnnotationModelEvent(IAnnotationModel model, boolean isWorldChange) {
fAnnotationModel= model;
fIsWorldChange= isWorldChange;
}
/**
* Returns the model this event refers to.
*
* @return the model this events belongs to
*/
public IAnnotationModel getAnnotationModel() {
return fAnnotationModel;
}
/**
* Adds the given annotation to the set of annotations that are reported as
* being added from the model. If this event is considered a world change,
* it is no longer so after this method has successfully finished.
*
* @param annotation the added annotation
* @since 3.0
*/
public void annotationAdded(Annotation annotation) {
fAddedAnnotations.add(annotation);
fIsWorldChange= false;
}
/**
* Returns the added annotations.
*
* @return the added annotations
* @since 3.0
*/
public Annotation[] getAddedAnnotations() {
int size= fAddedAnnotations.size();
Annotation[] added= new Annotation[size];
fAddedAnnotations.toArray(added);
return added;
}
/**
* Adds the given annotation to the set of annotations that are reported as
* being removed from the model. If this event is considered a world
* change, it is no longer so after this method has successfully finished.
*
* @param annotation the removed annotation
* @since 3.0
*/
public void annotationRemoved(Annotation annotation) {
annotationRemoved(annotation, null);
}
/**
* Adds the given annotation to the set of annotations that are reported as
* being removed from the model. If this event is considered a world
* change, it is no longer so after this method has successfully finished.
*
* @param annotation the removed annotation
* @param position the position of the removed annotation
* @since 3.0
*/
public void annotationRemoved(Annotation annotation, Position position) {
fRemovedAnnotations.put(annotation, position);
fIsWorldChange= false;
}
/**
* Returns the removed annotations.
*
* @return the removed annotations
* @since 3.0
*/
public Annotation[] getRemovedAnnotations() {
int size= fRemovedAnnotations.size();
Annotation[] removed= new Annotation[size];
fRemovedAnnotations.keySet().toArray(removed);
return removed;
}
/**
* Returns the position of the removed annotation at that point in time
* when the annotation has been removed.
*
* @param annotation the removed annotation
* @return the position of the removed annotation or <code>null</code>
* @since 3.0
*/
public Position getPositionOfRemovedAnnotation(Annotation annotation) {
return (Position) fRemovedAnnotations.get(annotation);
}
/**
* Adds the given annotation to the set of annotations that are reported as
* being changed from the model. If this event is considered a world
* change, it is no longer so after this method has successfully finished.
*
* @param annotation the changed annotation
* @since 3.0
*/
public void annotationChanged(Annotation annotation) {
fChangedAnnotations.add(annotation);
fIsWorldChange= false;
}
/**
* Returns the changed annotations.
*
* @return the changed annotations
* @since 3.0
*/
public Annotation[] getChangedAnnotations() {
int size= fChangedAnnotations.size();
Annotation[] changed= new Annotation[size];
fChangedAnnotations.toArray(changed);
return changed;
}
/**
* Returns whether this annotation model event is empty or not. If this
* event represents a world change, this method returns <code>false</code>
* although the event does not carry any added, removed, or changed
* annotations.
*
* @return <code>true</code> if this event is empty
* @since 3.0
*/
public boolean isEmpty() {
return !fIsWorldChange && fAddedAnnotations.isEmpty() && fRemovedAnnotations.isEmpty() && fChangedAnnotations.isEmpty();
}
/**
* Returns whether this annotation model events contains detailed
* information about the modifications applied to the event annotation
* model or whether it represents a world change. I.e. everything in the
* model might have changed.
*
* @return <code>true</code> if world change, <code>false</code> otherwise
* @since 3.0
*/
public boolean isWorldChange() {
return fIsWorldChange;
}
/**
* Marks this event as world change according to the given flag.
*
* @param isWorldChange <code>true</code> if this event is a world change, <code>false</code> otherwise
* @since 3.0
*/
void markWorldChange(boolean isWorldChange) {
fIsWorldChange= isWorldChange;
}
/**
* Returns whether this annotation model event is still valid.
*
* @return <code>true</code> if this event is still valid, <code>false</code> otherwise
* @since 3.0
*/
public boolean isValid() {
if (fModificationStamp != null && fAnnotationModel instanceof IAnnotationModelExtension) {
IAnnotationModelExtension extension= (IAnnotationModelExtension) fAnnotationModel;
return fModificationStamp == extension.getModificationStamp();
}
return true;
}
/**
* Seals this event. Any direct modification to the annotation model after the event has been sealed
* invalidates this event.
*
* @since 3.0
*/
public void markSealed() {
if (fAnnotationModel instanceof IAnnotationModelExtension) {
IAnnotationModelExtension extension= (IAnnotationModelExtension) fAnnotationModel;
fModificationStamp= extension.getModificationStamp();
}
}
}
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