/**
* Copyright 2010 Google Inc.
*
* Licensed 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.waveprotocol.box.server.robots;
import com.google.common.collect.Maps;
import com.google.wave.api.InvalidRequestException;
import com.google.wave.api.OperationType;
import org.waveprotocol.box.server.robots.operations.OperationService;
import org.waveprotocol.wave.util.logging.Log;
import java.util.Map;
/**
* Abstract class for registering and accessing {@link OperationService} to
* execute operations for use in the Robot APIs. Note that this class is not
* thread safe.
*
* Implementations of this class are expected to define the way and moment when
* operations are registered.
*
* @author ljvderijk@google.com (Lennard de Rijk)
*/
public abstract class AbstractOperationServiceRegistry implements OperationServiceRegistry {
private static Log LOG = Log.get(AbstractOperationServiceRegistry.class);
private Map<OperationType, OperationService> operationMap = Maps.newHashMap();
public AbstractOperationServiceRegistry() {
}
@Override
public final OperationService getServiceFor(OperationType opType) throws InvalidRequestException {
OperationService service = operationMap.get(opType);
if (service == null) {
throw new InvalidRequestException("No OperationService found for " + opType);
}
return service;
}
/**
* Registers the {@link OperationService} for the given {@link OperationType}.
*
* @param operation the type of the operation to register for
* @param service the {@link OperationService} to be registered
*/
protected final void register(OperationType operation, OperationService service) {
// Do a put first so we can make it use a concurrent map if needed.
OperationService oldValue = operationMap.put(operation, service);
if (oldValue != null) {
LOG.warning("The OperationService for " + operation.name() + " was overwritten");
}
}
}