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}