DummyListener.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
 *
 *   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.sling.discovery.commons.providers.base;

import static org.junit.Assert.fail;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

import org.apache.sling.discovery.TopologyEvent;
import org.apache.sling.discovery.TopologyEventListener;
import org.apache.sling.discovery.commons.providers.BaseTopologyView;

public class DummyListener implements TopologyEventListener {

    private List<TopologyEvent> allEvents = new LinkedList<TopologyEvent>();
    private List<TopologyEvent> events = new LinkedList<TopologyEvent>();
    private TopologyEvent lastEvent;
    
    public synchronized void handleTopologyEvent(TopologyEvent event) {
        events.add(event);
        allEvents.add(event);
        lastEvent = event;
    }
    
    public synchronized List<TopologyEvent> getEvents() {
        return Collections.unmodifiableList(events);
    }

    public synchronized int countEvents() {
        return events.size();
    }
    
    public synchronized TopologyEvent getLastEvent() {
        return lastEvent;
    }

    public synchronized void clearEvents() {
        events.clear();
    }

    public BaseTopologyView getLastView() {
        if (lastEvent==null) {
            return null;
        } else {
            switch(lastEvent.getType()) {
            case TOPOLOGY_INIT:
            case PROPERTIES_CHANGED:
            case TOPOLOGY_CHANGED: {
                return (BaseTopologyView) lastEvent.getNewView();
            }
            case TOPOLOGY_CHANGING:{
                return (BaseTopologyView) lastEvent.getOldView();
            }
            default: {
                fail("no other types supported yet");
            }
            }
        }
        return null;
    }
    
}