ProgramKeyMaker.java

/*
 * Copyright © 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.data2.registry.internal.keymaker;

import co.cask.cdap.data2.dataset2.lib.table.MDSKey;
import co.cask.cdap.data2.registry.internal.pair.KeyMaker;
import co.cask.cdap.proto.Id;
import co.cask.cdap.proto.ProgramType;

/**
 * {@link KeyMaker} for {@link Id.Program}.
 */
public class ProgramKeyMaker implements KeyMaker<Id.Program> {

  public static Id.Program getProgramId(Id.Application applicationId) {
    // Use empty programId to denote applicationId
    return Id.Program.from(applicationId, ProgramType.FLOW, "");
  }

  @Override
  public MDSKey getKey(Id.Program programId) {
    MDSKey.Builder keyBuilder = new MDSKey.Builder()
      .add(programId.getNamespaceId())
      .add(programId.getApplicationId());

    // If programId is empty, this is actually applicationId
    if (!programId.getId().isEmpty()) {
      keyBuilder.add(programId.getType().getCategoryName());
      keyBuilder.add(programId.getId());
    }

    return keyBuilder.build();
  }

  @Override
  public void skipKey(MDSKey.Splitter splitter) {
    splitter.skipString(); // namespace
    splitter.skipString(); // app
    splitter.skipString(); // type
    splitter.skipString(); // program
  }

  @Override
  public Id.Program getElement(MDSKey.Splitter splitter) {
    return Id.Program.from(splitter.getString(), splitter.getString(),
                           ProgramType.valueOfCategoryName(splitter.getString()),
                           splitter.getString());
  }
}