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Container pom for Pentaho Data Integration modules

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/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2017 by Hitachi Vantara : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * 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.pentaho.di.trans.steps.switchcase;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.pentaho.di.core.RowSet;

public class KeyToRowSetMap {

  protected Map> map;

  protected KeyToRowSetMap() {
    map = new HashMap>();
  }

  /**
   * Support custom runtime implementation.
   *
   * @param map
   */
  protected KeyToRowSetMap( Map> map ) {
    this.map = map;
  }

  protected Set get( Object key ) {
    return map.get( key );
  }

  protected void put( Object key, RowSet rowSet ) {
    Set existing = map.get( key );
    if ( existing == null ) {
      existing = new HashSet();
      map.put( key, existing );
    }
    existing.add( rowSet );
  }

  public boolean containsKey( Object key ) {
    return map.containsKey( key );
  }

  public boolean isEmpty() {
    return map.keySet().isEmpty();
  }

  protected Set