VerifierFactoryListModel.java
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* https://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 java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.ListModel;
import javax.swing.event.ListDataEvent;
import javax.swing.event.ListDataListener;
import org.apache.commons.lang3.ArrayUtils;
/**
* This class implements an adapter; it implements both a Swing ListModel and a VerifierFactoryObserver.
*/
public class VerifierFactoryListModel implements VerifierFactoryObserver, ListModel<String> {
private final List<ListDataListener> listeners = new ArrayList<>();
private final Set<String> cache = new TreeSet<>();
public VerifierFactoryListModel() {
VerifierFactory.attach(this);
update(null); // fill cache.
}
@Override
public synchronized void addListDataListener(final ListDataListener l) {
listeners.add(l);
}
@Override
public synchronized String getElementAt(final int index) {
return cache.toArray(ArrayUtils.EMPTY_STRING_ARRAY)[index];
}
@Override
public synchronized int getSize() {
return cache.size();
}
@Override
public synchronized void removeListDataListener(final ListDataListener l) {
listeners.remove(l);
}
@Override
public synchronized void update(final String s) {
final Verifier[] verifiers = VerifierFactory.getVerifiers();
final int verifierLen = verifiers.length;
cache.clear();
for (final Verifier verifier : verifiers) {
cache.add(verifier.getClassName());
}
for (final ListDataListener listener : listeners) {
listener.contentsChanged(new ListDataEvent(this, ListDataEvent.CONTENTS_CHANGED, 0, verifierLen - 1));
}
}
}