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 org.apache.ambari.server.collections.Predicate;
  import org.apache.commons.collections4.Transformer;
  
  /**
   * OperationPredicate is an abstract class providing functionality of transforming the input context
   * before executing the implementation-specific
   * {@link org.apache.commons.collections4.Predicate#evaluate(Object)} method.
   */
  abstract class OperationPredicate extends Predicate {
    /**
     * The {@link Transformer} to use to transform the data before evaluation
     */
    private ContextTransformer transformer = null;
  
    /**
     * Constructor
     *
     * @param name        the name of this {@link Predicate}
     * @param transformer the {@link Transformer} to use to transform the data before evaluation
     */
    OperationPredicate(String name, ContextTransformer transformer) {
      super(name);
      this.transformer = transformer;
    }
  
    /**
     * Gets the {@link Transformer}
     *
     * @return the assigned {@link ContextTransformer}
     */
    public ContextTransformer getTransformer() {
      return transformer;
    }
  
    /**
     * Sets the {@link Transformer}
     *
     * @param transformer a {@link ContextTransformer}
     */
    public void setTransformer(ContextTransformer transformer) {
      this.transformer = transformer;
    }
  
  
    /**
     * Gets the context key assigned to the {@link ContextTransformer}.
     * <p>
     * This key is used to identify which value from the context a passed to the
     * {@link org.apache.commons.collections4.Predicate#evaluate(Object)} method
     *
     * @return a key name
     */
    public String getContextKey() {
      return (this.transformer == null) ? null : this.transformer.getKey();
    }
  
    @Override
    public boolean evaluate(Object o) {
      Object data = (transformer == null) ? o : transformer.transform(o);
      return evaluateTransformedData(data);
    }
  
    @Override
    public int hashCode() {
      return super.hashCode() + (37 * ((transformer == null) ? 0 : transformer.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 OperationPredicate) && (hashCode() == obj.hashCode())) {
        OperationPredicate p = (OperationPredicate) obj;
        return (transformer == null) ? (p.transformer == null) : transformer.equals(p.transformer);
      } else {
        return false;
      }
    }
  
    /**
     * Abstract method used internally to process the {@link #evaluate(Object)} logic after the
     * input data is transformed.
     *
     * @param data the transformed data to use
     * @return the result of the evaluation (<code>true</code>, <code>false</code>)
     * @see org.apache.commons.collections4.Predicate#evaluate(Object)
     */
    protected abstract boolean evaluateTransformedData(Object data);
  
  }
  