content: /*
   * 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.apache.ambari.server.api.predicate.operators;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.ambari.server.api.predicate.InvalidQueryException;
  import org.apache.ambari.server.controller.predicate.EqualsPredicate;
  import org.apache.ambari.server.controller.predicate.OrPredicate;
  import org.apache.ambari.server.controller.spi.Predicate;
  
  /**
   * IN relational operator.
   * This is a binary operator which takes a comma delimited right operand and
   * creates equals predicates with the left operand and each right operand token.
   * The equals predicates are combined with an OR predicate.
   *
   */
  public class InOperator extends AbstractOperator implements RelationalOperator {
  
    public InOperator() {
      super(0);
    }
  
    @Override
    public String getName() {
      return "InOperator";
    }
  
    @Override
    public Predicate toPredicate(String prop, String val) throws InvalidQueryException {
  
      if (val == null) {
        throw new InvalidQueryException("IN operator is missing a required right operand for property " + prop);
      }
  
      String[] tokens = val.split(",");
      List<EqualsPredicate> listPredicates = new ArrayList<>();
      for (String token : tokens) {
        listPredicates.add(new EqualsPredicate<>(prop, token.trim()));
      }
      return listPredicates.size() == 1 ? listPredicates.get(0) :
          buildOrPredicate(listPredicates);
    }
  
    private OrPredicate buildOrPredicate(List<EqualsPredicate> listPredicates) {
      return new OrPredicate(listPredicates.toArray(new Predicate[listPredicates.size()]));
    }
  
    @Override
    public TYPE getType() {
      return TYPE.IN;
    }
  }
  