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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed 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 com.rapiddweller.common.accessor;

import com.rapiddweller.common.Accessor;

/**
 * Two step Accessor, that uses one Accessor to fetch an object and another one to read a value from it.
 * Created: 12.06.2007 18:43:28
 *
 * @author Volker Bergmann
 */
@SuppressWarnings({"unchecked", "rawtypes"})
public class FetchingAccessor implements Accessor {

  private final Accessor provider;
  private final Accessor accessor;

  /**
   * Instantiates a new Fetching accessor.
   *
   * @param provider the provider
   * @param accessor the accessor
   */
  public FetchingAccessor(Accessor provider, Accessor accessor) {
    this.provider = provider;
    this.accessor = accessor;
  }

  @Override
  public Object getValue(Object o) {
    return accessor.getValue(provider.getValue(o));
  }

  @Override
  public String toString() {
    return getClass().getSimpleName() + "[accessor=" + accessor + ", provider=" + provider + "]";
  }

}