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 org.apache.ambari.server.api.predicate.InvalidQueryException;
  import org.apache.ambari.server.controller.predicate.FilterPredicate;
  import org.apache.ambari.server.controller.spi.Predicate;
  
  /**
   * This is a binary operator which takes right operand as a regular
   * expression and applies it to the left operand
   */
  public class FilterOperator extends AbstractOperator implements RelationalOperator {
  
    public FilterOperator() {
      super(0);
    }
  
    @Override
    public String getName() {
      return "FilterOperator";
    }
  
    @Override
    public Predicate toPredicate(String prop, String val) throws InvalidQueryException {
      if (val == null) {
        throw new InvalidQueryException("Filter operator is missing a required right operand.");
      }
      return new FilterPredicate(prop, val);
    }
  
    @Override
    public TYPE getType() {
      return TYPE.FILTER;
    }
  }
  