SelectionProvider.java

/*
 * Copyright (c) 2004-2011 Marco Maccaferri 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:
 *     Marco Maccaferri - initial API and implementation
 */

package org.eclipsetrader.ui.internal.charts.views;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipsetrader.ui.internal.UIActivator;

public class SelectionProvider implements ISelectionProvider {

    private ListenerList selectionListeners = new ListenerList(ListenerList.IDENTITY);
    private ISelection selection;

    public SelectionProvider() {
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionProvider#addSelectionChangedListener(org.eclipse.jface.viewers.ISelectionChangedListener)
     */
    @Override
    public void addSelectionChangedListener(ISelectionChangedListener listener) {
        selectionListeners.add(listener);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionProvider#removeSelectionChangedListener(org.eclipse.jface.viewers.ISelectionChangedListener)
     */
    @Override
    public void removeSelectionChangedListener(ISelectionChangedListener listener) {
        selectionListeners.remove(listener);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionProvider#getSelection()
     */
    @Override
    public ISelection getSelection() {
        return selection;
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ISelectionProvider#setSelection(org.eclipse.jface.viewers.ISelection)
     */
    @Override
    public void setSelection(ISelection newSelection) {
        if (this.selection != newSelection) {
            this.selection = newSelection;
            fireSelectionChangedEvent(new SelectionChangedEvent(this, newSelection));
        }
    }

    protected void fireSelectionChangedEvent(SelectionChangedEvent event) {
        Object[] l = selectionListeners.getListeners();
        for (int i = 0; i < l.length; i++) {
            try {
                ((ISelectionChangedListener) l[i]).selectionChanged(event);
            } catch (Throwable e) {
                Status status = new Status(IStatus.ERROR, UIActivator.PLUGIN_ID, Messages.SelectionProvider_ExceptionMessage, e);
                UIActivator.log(status);
            }
        }
    }
}