WorkflowMapReduceProgram.java

/*
 * Copyright © 2014-2015 Cask Data, 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 co.cask.cdap.internal.app.runtime.workflow;

import co.cask.cdap.api.app.ApplicationSpecification;
import co.cask.cdap.api.mapreduce.MapReduce;
import co.cask.cdap.api.mapreduce.MapReduceSpecification;
import co.cask.cdap.api.workflow.Workflow;
import co.cask.cdap.app.program.Program;
import co.cask.cdap.internal.app.ForwardingApplicationSpecification;
import co.cask.cdap.proto.ProgramType;
import com.google.common.collect.ImmutableMap;

import java.util.Map;

/**
 * A Forwarding Program that turns a {@link Workflow} Program into a {@link MapReduce} program.
 */
public final class WorkflowMapReduceProgram extends AbstractWorkflowProgram {

  private final MapReduceSpecification mapReduceSpecification;

  public WorkflowMapReduceProgram(Program delegate, MapReduceSpecification mapReduceSpecification) {
    super(delegate, mapReduceSpecification);
    this.mapReduceSpecification = mapReduceSpecification;
  }

  @Override
  public ProgramType getType() {
    return ProgramType.MAPREDUCE;
  }

  @Override
  public ApplicationSpecification getApplicationSpecification() {
    return new ForwardingApplicationSpecification(super.getForwardingProgramSpecification()) {
      @Override
      public Map<String, MapReduceSpecification> getMapReduce() {
        return ImmutableMap.of(mapReduceSpecification.getName(), mapReduceSpecification);
      }
    };
  }
}