/*
 * Copyright  2000-2004 The Apache Software Foundation
 *
 *  Licensed 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.bcel.verifier;

import javax.swing.event.ListDataEvent;

/**
 * This class implements an adapter; it implements both a Swing ListModel and
 * a VerifierFactoryObserver.
 *
 * @version $Id: VerifierFactoryListModel.java 386056 2006-03-15 11:31:56Z tcurdt $
 * @author Enver Haase
 */
public class VerifierFactoryListModel implements org.apache.bcel.verifier.VerifierFactoryObserver,
        javax.swing.ListModel {

    private java.util.ArrayList listeners = new java.util.ArrayList();
    private java.util.TreeSet cache = new java.util.TreeSet();


    public VerifierFactoryListModel() {
        VerifierFactory.attach(this);
        update(null); // fill cache.
    }


    public synchronized void update( String s ) {
        int size = listeners.size();
        Verifier[] verifiers = VerifierFactory.getVerifiers();
        int num_of_verifiers = verifiers.length;
        cache.clear();
        for (int i = 0; i < num_of_verifiers; i++) {
            cache.add(verifiers[i].getClassName());
        }
        for (int i = 0; i < size; i++) {
            ListDataEvent e = new ListDataEvent(this, ListDataEvent.CONTENTS_CHANGED, 0,
                    num_of_verifiers - 1);
            ((javax.swing.event.ListDataListener) (listeners.get(i))).contentsChanged(e);
        }
    }


    public synchronized void addListDataListener( javax.swing.event.ListDataListener l ) {
        listeners.add(l);
    }


    public synchronized void removeListDataListener( javax.swing.event.ListDataListener l ) {
        listeners.remove(l);
    }


    public synchronized int getSize() {
        return cache.size();
    }


    public synchronized Object getElementAt( int index ) {
        return (cache.toArray())[index];
    }
}