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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;

/**
 * Inverts the boolean result of another Accessor.
 * Created: 07.03.2006 16:48:52
 *
 * @param  the object type to access
 * @author Volker Bergmann
 */
public class NotAccessor extends AccessorProxy {

  /**
   * Instantiates a new Not accessor.
   *
   * @param realAccessor the real accessor
   */
  public NotAccessor(Accessor realAccessor) {
    super(realAccessor);
  }

  // Accessor interface ----------------------------------------------------------------------------------------------

  @Override
  public Boolean getValue(E target) {
    Boolean value = super.getValue(target);
    if (value == null) {
      return null;
    } else if (value) {
      return Boolean.FALSE;
    } else {
      return Boolean.TRUE;
    }
  }

  // java.lang.Object overrides --------------------------------------------------------------------------------------

  @SuppressWarnings("rawtypes")
  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    final NotAccessor that = (NotAccessor) o;
    return this.realAccessor.equals(that.realAccessor);
  }

  @Override
  public int hashCode() {
    return realAccessor.hashCode();
  }
}