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.collections;
  
  import java.util.Map;
  
  import com.google.gson.Gson;
  
  /**
   * {@link Predicate} wraps {@link org.apache.commons.collections4.Predicate} to
   * provide additional functionality like serializing to and from a Map and JSON formatted data.
   */
  public abstract class Predicate implements org.apache.commons.collections4.Predicate {
  
    /**
     * The name of this predicate. For example "and", "or", etc...
     */
    private final String name;
  
    protected Predicate(String name) {
      this.name = name;
    }
  
    public String getName() {
      return name;
    }
  
    /**
     * Serialize this {@link Predicate} to a {@link Map}
     *
     * @return a {@link Map}
     */
    public abstract Map<String, Object> toMap();
  
    /**
     * Serialize this {@link Predicate} to a JSON-formatted {@link String}
     *
     * @return a JSON-formatted {@link String}
     */
    public String toJSON() {
      Map<String, Object> map = toMap();
      return (map == null) ? null : new Gson().toJson(map);
    }
  
  
    @Override
    public int hashCode() {
      return 37 * ((name == null) ? 0 : name.hashCode());
    }
  
    @Override
    public boolean equals(Object obj) {
      if (obj == this) {
        return true;
      } else if (obj == null) {
        return false;
      } else if ((obj instanceof Predicate) && (hashCode() == obj.hashCode())) {
        Predicate p = (Predicate) obj;
        return (name == null) ? (p.name == null) : name.equals(p.name);
      } else {
        return false;
      }
    }
  
  }
  
  