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 java.util.Arrays;
  import java.util.LinkedList;
  import java.util.List;
  
  import org.apache.ambari.server.controller.spi.Predicate;
  import org.apache.ambari.server.controller.spi.Resource;
  
  
  /**
   * Predicate which evaluates to true if all of the predicates in a predicate
   * array evaluate to true.
   */
  public class AndPredicate extends ArrayPredicate {
  
    public AndPredicate(Predicate... predicates) {
      super(predicates);
    }
  
    @Override
    public Predicate create(Predicate... predicates) {
      return instance(predicates);
    }
  
    public static Predicate instance(Predicate... predicates) {
      List<Predicate> predicateList = new LinkedList<>();
  
      // Simplify the predicate array
      for (Predicate predicate : predicates) {
        if (!(predicate instanceof AlwaysPredicate)) {
          if (predicate instanceof AndPredicate) {
            predicateList.addAll(Arrays.asList(((AndPredicate) predicate).getPredicates()));
          }
          else {
            predicateList.add(predicate);
          }
        }
      }
  
      return predicateList.size() == 1 ?
          predicateList.get(0) :
          new AndPredicate(predicateList.toArray(new Predicate[predicateList.size()]));
    }
  
    @Override
    public boolean evaluate(Resource resource) {
      Predicate[] predicates = getPredicates();
      for (Predicate predicate : predicates) {
        if (!predicate.evaluate(resource)) {
          return false;
        }
      }
      return true;
    }
  
    @Override
    public String getOperator() {
      return "AND";
    }
  }
  