/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.service.desktop;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 * Default implementation of BundleSelectionModel.
 *
 */
public class DefaultBundleSelectionModel implements BundleSelectionModel {

  // Long
  Set selection = new HashSet();

  // BundleSelectionListener
  Set listeners = new HashSet();

  public DefaultBundleSelectionModel() {

  }
  
  
  public void    clearSelection() {
    selection.clear();
    fireChange(-1);
  }

  public boolean isSelected(long bid) {
    return selection.contains(new Long(bid));
  }
  
  public void    setSelected(long bid, boolean bSelected) {
    if(bSelected) {
      selection.add(new Long(bid)); 
    } else {
      selection.remove(new Long(bid)); 
    }
    fireChange(bid);
  }

  public void    addBundleSelectionListener(BundleSelectionListener l) {
    synchronized(listeners) {
      listeners.add(l);
    }
  }
  
  public void    removeBundleSelectionListener(BundleSelectionListener l) {
    synchronized(listeners) {
      listeners.remove(l);
    }
  }

  /**
   * Send a value changed event to all <tt>BundleSelectionListener</tt>
   */
  public void fireChange(long bid) {
    synchronized(listeners) {
      for(Iterator it = listeners.iterator(); it.hasNext();) {
	BundleSelectionListener l = (BundleSelectionListener)it.next();
	l.valueChanged(bid);
      }
    }
  }
}