branch-1.2/ambari-server/src/main/java/org/apache/ambari/server/controller/predicate/ArrayPredicate.java

/**
 * 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.HashSet;
import java.util.Set;

/**
 * Predicate which evaluates an array of predicates.
 */
public abstract class ArrayPredicate implements BasePredicate {
  private final BasePredicate[] predicates;
  private final Set<String> propertyIds = new HashSet<String>();

  public ArrayPredicate(BasePredicate... predicates) {
    this.predicates = predicates;
    for (BasePredicate predicate : predicates) {
      propertyIds.addAll(predicate.getPropertyIds());
    }
  }

  /**
   * Factory method.
   *
   * @param predicates  the predicate array
   *
   * @return a new ArrayPredicate
   */
  public abstract BasePredicate create(BasePredicate... predicates);


  public BasePredicate[] getPredicates() {
    return predicates;
  }

  @Override
  public Set<String> getPropertyIds() {
    return propertyIds;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof ArrayPredicate)) return false;

    ArrayPredicate that = (ArrayPredicate) o;

    if (propertyIds != null ? !propertyIds.equals(that.propertyIds) : that.propertyIds != null) return false;

    // don't care about array order
    Set<BasePredicate> setThisPredicates = new HashSet<BasePredicate>(Arrays.asList(predicates));
    Set<BasePredicate> setThatPredicates = new HashSet<BasePredicate>(Arrays.asList(that.predicates));
    return setThisPredicates.equals(setThatPredicates);
  }

  @Override
  public int hashCode() {
    // don't care about array order
    int result = predicates != null ? new HashSet<BasePredicate>(Arrays.asList(predicates)).hashCode() : 0;
    result = 31 * result + (propertyIds != null ? propertyIds.hashCode() : 0);
    return result;
  }

  @Override
  public void accept(PredicateVisitor visitor) {
    visitor.acceptArrayPredicate(this);
  }

  public abstract String getOperator();
}