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.internal;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.ambari.server.controller.predicate.AlwaysPredicate;
  import org.apache.ambari.server.controller.predicate.ArrayPredicate;
  import org.apache.ambari.server.controller.predicate.CategoryPredicate;
  import org.apache.ambari.server.controller.predicate.ComparisonPredicate;
  import org.apache.ambari.server.controller.predicate.PredicateVisitor;
  import org.apache.ambari.server.controller.predicate.PropertyPredicate;
  import org.apache.ambari.server.controller.predicate.UnaryPredicate;
  import org.apache.ambari.server.controller.spi.Predicate;
  import org.apache.ambari.server.controller.utilities.PredicateHelper;
  
  /**
   * Predicate visitor for extracting property values from the {@link PropertyPredicate}s of a predicate graph.
   */
  public class PropertyPredicateVisitor implements PredicateVisitor {
    private final Map<String, Object> properties = new HashMap<>();
  
    @Override
    public void acceptComparisonPredicate(ComparisonPredicate predicate) {
      properties.put(predicate.getPropertyId(), predicate.getValue());
    }
  
    @Override
    public void acceptArrayPredicate(ArrayPredicate predicate) {
      Predicate[] predicates = predicate.getPredicates();
      for (Predicate predicate1 : predicates) {
        PredicateHelper.visit(predicate1, this);
      }
    }
  
    @Override
    public void acceptUnaryPredicate(UnaryPredicate predicate) {
      //Do nothing
    }
  
    @Override
    public void acceptAlwaysPredicate(AlwaysPredicate predicate) {
      //Do nothing
    }
  
    @Override
    public void acceptCategoryPredicate(CategoryPredicate predicate) {
      // Do nothing
    }
  
  
    // ----- accessors ---------------------------------------------------------
  
    /**
     * Get the properties.
     *
     * @return the properties
     */
    public Map<String, Object> getProperties() {
      return properties;
    }
  }
  