/*
* 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
*
* 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.jena.graph.test;
import java.util.Iterator;
import java.util.List;
import org.apache.jena.graph.Graph ;
import org.apache.jena.graph.GraphListener ;
import org.apache.jena.graph.Triple ;
/**
* These tests are for listeners that add or delete
* other listeners.
* It motivates the use of, e.g. CopyOnWriteArrayList
* for storing listeners.
*/
public class TestRegisterGraphListener extends GraphTestBase {
private ComeAndGoListener all[];
private Graph graph;
private static final class SimpleListener extends ComeAndGoListener {
@Override
void doSomeDamage() {}
}
abstract private static class ComeAndGoListener implements GraphListener {
// Was I registered when start() was called, and have not been unregistered.
boolean inPlay = false;
// currently registered or not.
boolean registered = false;
boolean notified = false;
void registerWith(Graph g) {
registered= true;
g.getEventManager().register(this);
}
void unregisterFrom(Graph g) {
registered = false;
inPlay = false;
g.getEventManager().unregister(this);
}
void start() {
if (registered) inPlay = true;
}
void check() {
if (inPlay && !notified) fail("listener that was in-play was not notified of adding triple.");
}
@Override
final public void notifyAddTriple(Graph g, Triple t) {
notified = true;
doSomeDamage();
}
abstract void doSomeDamage();
@Override
public void notifyAddArray(Graph g, Triple[] triples) {}
@Override
public void notifyAddGraph(Graph g, Graph added) {}
@Override
public void notifyAddIterator(Graph g, Iterator<Triple> it) {}
@Override
public void notifyAddList(Graph g, List<Triple> triples) {}
@Override
public void notifyDeleteArray(Graph g, Triple[] triples) {}
@Override
public void notifyDeleteGraph(Graph g, Graph removed) {}
@Override
public void notifyDeleteIterator(Graph g, Iterator<Triple> it) {}
@Override
public void notifyDeleteList(Graph g, List<Triple> L) {}
@Override
public void notifyDeleteTriple(Graph g, Triple t) {}
@Override
public void notifyEvent(Graph source, Object value) {}
}
public TestRegisterGraphListener(String name) {
super(name);
}
private void testAddingTriple(int addMe, ComeAndGoListener ...allx) {
graph = newGraph();
all = allx;
for (int i=0;i<addMe;i++) {
all[i].registerWith(graph);
} // 4 is unregistered.
for (ComeAndGoListener l:all) {
l.start();
}
graph.add(triple("make a change" ));
for (ComeAndGoListener l:all) {
l.check();
}
}
public void testAddOne() {
testAddingTriple(2,
new ComeAndGoListener(){
@Override
void doSomeDamage() {
all[2].registerWith(graph);
}},
new SimpleListener(),
new SimpleListener());
}
public void testDelete2nd() {
testAddingTriple(3,
new ComeAndGoListener(){
@Override
void doSomeDamage() {
all[1].unregisterFrom(graph);
}},
new SimpleListener(),
new SimpleListener());
}
public void testDelete1st() {
testAddingTriple(3,
new SimpleListener(),
new ComeAndGoListener(){
@Override
void doSomeDamage() {
all[0].unregisterFrom(graph);
}},
new SimpleListener());
}
public void testDeleteSelf() {
testAddingTriple(3,
new ComeAndGoListener(){
@Override
void doSomeDamage() {
unregisterFrom(graph);
}},
new SimpleListener(),
new SimpleListener());
}
public void testDeleteAndAddSelf() {
testAddingTriple(3,
new ComeAndGoListener(){
@Override
void doSomeDamage() {
unregisterFrom(graph);
registerWith(graph);
}},
new SimpleListener(),
new SimpleListener());
}
}