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.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.ambari.server.collections.Predicate;
  import org.apache.commons.collections4.functors.PredicateDecorator;
  
  /**
   * DelegatedMultiplePredicateContainer is an abstract class providing functionality related to
   * managing a delegate used to hold multiple {@link Predicate}s. For example <code>and</code> and
   * <code>or</code> operators.
   */
  abstract class DelegatedMultiplePredicateContainer extends Predicate implements PredicateDecorator {
  
    /**
     * The delegate {@link PredicateDecorator} used to handle the internal logic for the container
     */
    private final PredicateDecorator delegate;
  
    /**
     * Constructor.
     *
     * @param name     the name of this predicate
     * @param delegate the delegate used to handle the internal logic for the container
     */
    DelegatedMultiplePredicateContainer(String name, PredicateDecorator delegate) {
      super(name);
      this.delegate = delegate;
    }
  
    @Override
    public Map<String, Object> toMap() {
      return Collections.singletonMap(getName(), containedPredicatesToMaps());
    }
  
    @Override
    public boolean evaluate(Object o) {
      return delegate.evaluate(o);
    }
  
    @Override
    public org.apache.commons.collections4.Predicate[] getPredicates() {
      return delegate.getPredicates();
    }
  
    @Override
    public int hashCode() {
      return super.hashCode() + ((delegate == null) ? 0 : delegate.hashCode());
    }
  
    @Override
    public boolean equals(Object obj) {
      if (obj == this) {
        return true;
      } else if (obj == null) {
        return false;
      } else if (super.equals(obj) && (obj instanceof DelegatedMultiplePredicateContainer) && (hashCode() == obj.hashCode())) {
        DelegatedMultiplePredicateContainer p = (DelegatedMultiplePredicateContainer) obj;
        return (delegate == null) ? (p.delegate == null) : delegate.equals(p.delegate);
      } else {
        return false;
      }
    }
  
    /**
     * Processes the contained predicates into a {@link List} of {@link Map}s.
     * <p>
     * This is used to serialize this {@link DelegatedMultiplePredicateContainer} into a {@link Map}
     *
     * @return a list of maps representing the contained predicates
     */
    private List<Map<String, Object>> containedPredicatesToMaps() {
  
      List<Map<String, Object>> list = new ArrayList<>();
  
      if (delegate != null) {
        org.apache.commons.collections4.Predicate[] predicates = delegate.getPredicates();
  
        if (predicates != null) {
          for (org.apache.commons.collections4.Predicate p : predicates) {
            if (p instanceof Predicate) {
              list.add(((Predicate) p).toMap());
            } else {
              throw new UnsupportedOperationException(String.format("Cannot convert a %s to a Map", p.getClass().getName()));
            }
          }
        }
      }
  
      return list;
    }
  
  }
  