001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 *
017 */
018package org.apache.bcel.verifier;
019
020import java.util.ArrayList;
021import java.util.List;
022import java.util.Set;
023import java.util.TreeSet;
024
025import javax.swing.ListModel;
026import javax.swing.event.ListDataEvent;
027import javax.swing.event.ListDataListener;
028
029import org.apache.commons.lang3.ArrayUtils;
030
031/**
032 * This class implements an adapter; it implements both a Swing ListModel and a VerifierFactoryObserver.
033 *
034 */
035public class VerifierFactoryListModel implements VerifierFactoryObserver, ListModel<String> {
036
037    private final List<ListDataListener> listeners = new ArrayList<>();
038    private final Set<String> cache = new TreeSet<>();
039
040    public VerifierFactoryListModel() {
041        VerifierFactory.attach(this);
042        update(null); // fill cache.
043    }
044
045    @Override
046    public synchronized void addListDataListener(final ListDataListener l) {
047        listeners.add(l);
048    }
049
050    @Override
051    public synchronized String getElementAt(final int index) {
052        return cache.toArray(ArrayUtils.EMPTY_STRING_ARRAY)[index];
053    }
054
055    @Override
056    public synchronized int getSize() {
057        return cache.size();
058    }
059
060    @Override
061    public synchronized void removeListDataListener(final ListDataListener l) {
062        listeners.remove(l);
063    }
064
065    @Override
066    public synchronized void update(final String s) {
067        final Verifier[] verifiers = VerifierFactory.getVerifiers();
068        final int num_of_verifiers = verifiers.length;
069        cache.clear();
070        for (final Verifier verifier : verifiers) {
071            cache.add(verifier.getClassName());
072        }
073        for (final ListDataListener listener : listeners) {
074            listener.contentsChanged(new ListDataEvent(this, ListDataEvent.CONTENTS_CHANGED, 0, num_of_verifiers - 1));
075        }
076    }
077
078}