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.functors;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.ambari.server.collections.Predicate;
  
  /**
   * {@link PredicateClassFactory} is a factory class used to derive a {@link Predicate} implementation
   * class from its name.
   */
  public class PredicateClassFactory {
    /**
     * A static map of names to {@link Class}s.
     */
    private static final Map<String, Class<? extends Predicate>> NAME_TO_CLASS;
  
    static {
      Map<String, Class<? extends Predicate>> map = new HashMap<>();
  
      map.put(AndPredicate.NAME, AndPredicate.class);
      map.put(OrPredicate.NAME, OrPredicate.class);
      map.put(NotPredicate.NAME, NotPredicate.class);
      map.put(ContainsPredicate.NAME, ContainsPredicate.class);
      map.put(EqualsPredicate.NAME, EqualsPredicate.class);
  
      NAME_TO_CLASS = Collections.unmodifiableMap(map);
    }
  
    /**
     * Return a {@link Predicate} implementation class give its name
     *
     * @param name the name of a {@link Predicate} implementation
     * @return a {@link Predicate} implementation class give its name or <code>null</code> is not found
     */
    public static Class<? extends Predicate> getPredicateClass(String name) {
      return (name == null) ? null : NAME_TO_CLASS.get(name);
    }
  }
  