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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.converter;

import com.rapiddweller.common.ConversionException;

/**
 * Maps true, false and null to configured aliases, e.g. '1', '0' and '?'.
 * By default booleans are converted to the strings 'true', 'false' and null.
 * Created at 11.03.2009 19:40:33
 *
 * @param  the object type to convert to
 * @author Volker Bergmann
 * @since 0.5.8
 */
public class BooleanMapper extends ThreadSafeConverter {

  private final T trueValue;
  private final T falseValue;
  private final T nullValue;

  /**
   * Instantiates a new Boolean mapper.
   */
  @SuppressWarnings("unchecked")
  public BooleanMapper() {
    this((T) "true", (T) "false", null);
  }

  /**
   * Instantiates a new Boolean mapper.
   *
   * @param trueValue  the true value
   * @param falseValue the false value
   * @param nullValue  the null value
   */
  @SuppressWarnings("unchecked")
  public BooleanMapper(T trueValue, T falseValue, T nullValue) {
    super(Boolean.class, (Class) trueValue.getClass());
    this.trueValue = trueValue;
    this.falseValue = falseValue;
    this.nullValue = nullValue;
  }

  @Override
  public T convert(Boolean sourceValue) throws ConversionException {
    return (sourceValue != null ? (sourceValue ? trueValue : falseValue) : nullValue);
  }

}