/*******************************************************************************
* Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
* Distributed under license by Red Hat, Inc. All rights reserved.
* This program is 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:
* Exadel, Inc. and Red Hat, Inc. - initial API and implementation
******************************************************************************/
package org.jboss.tools.common.editor;
import java.util.*;
import org.eclipse.jface.viewers.*;
import org.jboss.tools.common.model.XModelObject;
public abstract class AbstractSelectionProvider implements ISelectionProvider, IPostSelectionProvider {
private ArrayList<ISelectionChangedListener> listeners = new ArrayList<ISelectionChangedListener>();
public void addSelectionChangedListener(ISelectionChangedListener listener) {
if(!listeners.contains(listener)) listeners.add(listener);
}
public ISelection getSelection() {
XModelObject o = getSelectedModelObject();
return (o == null) ? new StructuredSelection() : new StructuredSelection(o);
}
public void removeSelectionChangedListener(ISelectionChangedListener listener) {
listeners.remove(listener);
}
public void setSelection(ISelection selection) {
if(!(selection instanceof StructuredSelection)) return;
StructuredSelection ss = (StructuredSelection)selection;
if(!ss.isEmpty() && (ss.getFirstElement() instanceof XModelObject))
setSelectedModelObject((XModelObject)ss.getFirstElement());
}
public void fireSelectionChanged() {
if(listeners.isEmpty()) return;
ISelection selection = getSelection();
if(selection == null) return;
SelectionChangedEvent newEvent = new SelectionChangedEvent(this, selection);
Iterator iterator = listeners.iterator();
while (iterator.hasNext())
((ISelectionChangedListener)iterator.next()).selectionChanged(newEvent);
}
protected abstract XModelObject getSelectedModelObject();
protected abstract void setSelectedModelObject(XModelObject object);
public void addPostSelectionChangedListener(
ISelectionChangedListener listener) {
// do nothing - workaround for dali
}
public void removePostSelectionChangedListener(
ISelectionChangedListener listener) {
// do nothing - workaround for dali
}
}