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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.editor;
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import org.apache.log4j.Logger;
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import org.eclipse.core.runtime.ListenerList;
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import org.eclipse.jface.viewers.ISelection;
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import org.eclipse.jface.viewers.ISelectionChangedListener;
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import org.eclipse.jface.viewers.ISelectionProvider;
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import org.eclipse.jface.viewers.SelectionChangedEvent;
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import org.eclipse.jface.viewers.StructuredSelection;
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/**
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* @author p.ciardelli
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* @created 16.05.2008
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* @version 1.0
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*/
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public class SimpleSelectionProvider implements ISelectionProvider {
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private static final Logger logger = Logger
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.getLogger(SimpleSelectionProvider.class);
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private ListenerList listeners = new ListenerList();
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private ISelection selection;
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/*
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* (non-Javadoc)
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* @see org.eclipse.jface.viewers.ISelectionProvider#addSelectionChangedListener(org.eclipse.jface.viewers.ISelectionChangedListener)
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*/
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public void addSelectionChangedListener(
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ISelectionChangedListener listener) {
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listeners.add(listener);
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}
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/*
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* (non-Javadoc)
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* @see org.eclipse.jface.viewers.ISelectionProvider#getSelection()
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*/
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public ISelection getSelection() {
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if (selection != null)
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return selection;
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// TODO we have to return an empty selection to avoid NPE
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// I don't really understand why this was not the case before
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return new StructuredSelection();
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}
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/*
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* (non-Javadoc)
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* @see org.eclipse.jface.viewers.ISelectionProvider#removeSelectionChangedListener(org.eclipse.jface.viewers.ISelectionChangedListener)
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*/
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public void removeSelectionChangedListener(
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ISelectionChangedListener listener) {
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listeners.remove(listener);
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}
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/*
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* (non-Javadoc)
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* @see org.eclipse.jface.viewers.ISelectionProvider#setSelection(org.eclipse.jface.viewers.ISelection)
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*/
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public void setSelection(ISelection selection) {
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this.selection = selection;
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fireSelectionChanged();
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}
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private void fireSelectionChanged() {
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SelectionChangedEvent event = new SelectionChangedEvent(this, selection);
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for (Object listener : listeners.getListeners()) {
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if (listener instanceof ISelectionChangedListener) {
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((ISelectionChangedListener)listener).selectionChanged(event);
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}
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}
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}
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}
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