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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;

/**
 * Accessor that consecutively queries a chain of accessors
 * until one provides the requested value.
 *
 * @param  the object type to access
 * @param  the type of the value to get from the object
 * @author Volker Bergmann
 * @since 0.3.0
 */
public class FallbackAccessor implements Accessor {

  private final Accessor[] realAccessors;

  /**
   * Instantiates a new Fallback accessor.
   *
   * @param realAccessors the real accessors
   */
  @SafeVarargs
  public FallbackAccessor(Accessor... realAccessors) {
    this.realAccessors = realAccessors;
  }

  @Override
  public V getValue(C target) {
    for (Accessor realAccessor : realAccessors) {
      V value = realAccessor.getValue(target);
      if (value != null) {
        return value;
      }
    }
    return null;
  }
}