DoNothingService.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.waveprotocol.box.server.robots.operations;

import com.google.common.collect.Maps;
import com.google.wave.api.OperationRequest;
import com.google.wave.api.JsonRpcConstant.ParamsProperty;

import org.waveprotocol.box.server.robots.OperationContext;
import org.waveprotocol.wave.model.wave.ParticipantId;

/**
 * {@link OperationService} that just returns an empty response. Used for
 * robot.notify operation in the active robot and data api where we inspect this
 * operation to see which protocol version it uses but not produce any results.
 *
 * @author ljvderijk@google.com (Lennard de Rijk)
 */
public final class DoNothingService implements OperationService {

  public static DoNothingService create() {
    return new DoNothingService();
  }

  private DoNothingService() {
  }

  @Override
  public void execute(
      OperationRequest operation, OperationContext context, ParticipantId participant) {
    context.constructResponse(operation, Maps.<ParamsProperty, Object> newHashMap());
  }
}