/* | |
* Licensed to the Apache Software Foundation (ASF) under one | |
* or more contributor license agreements. See the NOTICE file | |
* distributed with this work for additional information | |
* regarding copyright ownership. The ASF licenses this file | |
* to you under the Apache License, Version 2.0 (the | |
* "License"); you may not use this file except in compliance | |
* with the License. You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, | |
* software distributed under the License is distributed on an | |
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
* KIND, either express or implied. See the License for the | |
* specific language governing permissions and limitations | |
* under the License. | |
*/ | |
package org.apache.uima.caseditor.editor; | |
import java.util.HashSet; | |
import java.util.List; | |
import java.util.Set; | |
import org.apache.uima.cas.FeatureStructure; | |
import org.apache.uima.cas.text.AnnotationFS; | |
import org.eclipse.core.runtime.Assert; | |
import org.eclipse.jface.viewers.ISelection; | |
import org.eclipse.jface.viewers.ISelectionChangedListener; | |
import org.eclipse.jface.viewers.ISelectionProvider; | |
import org.eclipse.jface.viewers.IStructuredSelection; | |
import org.eclipse.jface.viewers.SelectionChangedEvent; | |
import org.eclipse.jface.viewers.StructuredSelection; | |
/** | |
* This class is a {@link ISelectionProvider} and informs its listeners about the currently selected | |
* {@link FeatureStructure}s. | |
*/ | |
class FeatureStructureSelectionProvider implements ISelectionProvider { | |
private IStructuredSelection mCurrentSelection = new StructuredSelection(); | |
private Set<ISelectionChangedListener> mListeners = new HashSet<ISelectionChangedListener>(); | |
/** | |
* Adds an {@link ISelectionChangedListener} to this provider. | |
* | |
* @param listener | |
*/ | |
public void addSelectionChangedListener(ISelectionChangedListener listener) { | |
Assert.isNotNull(listener); | |
mListeners.add(listener); | |
} | |
/** | |
* Retrieves the current selection. | |
* | |
* @return selection | |
*/ | |
public ISelection getSelection() { | |
return mCurrentSelection; | |
} | |
/** | |
* Removes a registered selection listener. | |
* | |
* @param listener | |
* the listener to remove | |
*/ | |
public void removeSelectionChangedListener(ISelectionChangedListener listener) { | |
mListeners.remove(listener); | |
} | |
/** | |
* Sets the current selection. | |
* | |
* @param selection | |
*/ | |
public void setSelection(ISelection selection) { | |
Assert.isNotNull(selection); | |
IStructuredSelection structuredSelection = (IStructuredSelection) selection; | |
mCurrentSelection = structuredSelection; | |
for (ISelectionChangedListener listener : mListeners) { | |
SelectionChangedEvent event = new SelectionChangedEvent(this, mCurrentSelection); | |
listener.selectionChanged(event); | |
} | |
} | |
/** | |
* Sets the current selection to the given {@link AnnotationFS} object. | |
* | |
* @param annotation | |
*/ | |
public void setSelection(ICasDocument document, AnnotationFS annotation) { | |
if (annotation == null) { | |
throw new IllegalArgumentException("annotation must not be null!"); | |
} | |
setSelection(new StructuredSelection(new ModelFeatureStructure(document, annotation))); | |
} | |
public void setSelection(ICasDocument document, List<AnnotationFS> selection) { | |
setSelection(new StructuredSelection(ModelFeatureStructure.create(document, selection))); | |
} | |
/** | |
* Replaces the current selection with an empty selection. | |
*/ | |
public void clearSelection() { | |
setSelection(new StructuredSelection()); | |
} | |
/** | |
* Replaces the current selection with an empty selection without notifying listeners about it. | |
* | |
* Use it if the selection object is removed and a new selection was already made by an other | |
* {@link ISelectionProvider} instance. | |
*/ | |
public void clearSelectionSilently() { | |
mCurrentSelection = new StructuredSelection(); | |
} | |
} |