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.controller.predicate;
  
  import org.apache.ambari.server.controller.spi.Resource;
  
  /**
   * Predicate that checks equality of a given value to a {@link Resource} property.
   */
  public class EqualsPredicate<T> extends ComparisonPredicate<T> {
  
    public EqualsPredicate(String propertyId, Comparable<T> value) {
      super(propertyId, value);
    }
  
    @Override
    public boolean evaluate(Resource resource) {
      Object propertyValue  = resource.getPropertyValue(getPropertyId());
      Object predicateValue = getValue();
  
      return predicateValue == null ?
          propertyValue == null :
          propertyValue != null && compareValueTo(propertyValue) == 0;
    }
  
    /**
     * Case insensitive equality support for string types
     *
     * @param resource
     * @return
       */
    public boolean evaluateIgnoreCase(Resource resource) {
      Object propertyValue  = resource.getPropertyValue(getPropertyId());
      Object predicateValue = getValue();
  
      return predicateValue == null ?
              propertyValue == null :
              propertyValue != null && compareValueToIgnoreCase(propertyValue) == 0;
    }
  
    @Override
    public String getOperator() {
      return "=";
    }
  
    @Override
    public ComparisonPredicate<T> copy(String propertyId) {
      return new EqualsPredicate<>(propertyId, getValue());
    }
  }
  