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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;
import com.rapiddweller.common.StringUtil;

/**
 * Parses a {@link String} as a {@link Boolean}.
 * Created: 27.02.2010 11:44:57
 *
 * @author Volker Bergmann
 * @since 0.5.0
 */
public class String2BooleanConverter extends ThreadSafeConverter {

  private static final String DEFAULT_FALSE_STRING = "false";
  private static final String DEFAULT_TRUE_STRING = "true";
  private static final boolean DEFAULT_CASE_SENSITIVE = false;

  private final String trueString;
  private final String falseString;
  private final boolean caseSensitive;

  /**
   * Instantiates a new String 2 boolean converter.
   */
  public String2BooleanConverter() {
    this(DEFAULT_TRUE_STRING, DEFAULT_FALSE_STRING, DEFAULT_CASE_SENSITIVE);
  }

  /**
   * Instantiates a new String 2 boolean converter.
   *
   * @param trueString    the true string
   * @param falseString   the false string
   * @param caseSensitive the case sensitive
   */
  public String2BooleanConverter(String trueString, String falseString, boolean caseSensitive) {
    super(String.class, Boolean.class);
    this.falseString = falseString;
    this.trueString = trueString;
    this.caseSensitive = caseSensitive;
  }

  @Override
  public Boolean convert(String sourceValue) throws ConversionException {
    if (StringUtil.isEmpty(sourceValue)) {
      return null;
    }
    sourceValue = sourceValue.trim();
    if (caseSensitive) {
      if (trueString.equals(sourceValue)) {
        return true;
      } else if (falseString.equals(sourceValue)) {
        return false;
      }
    } else {
      if (trueString.equalsIgnoreCase(sourceValue)) {
        return true;
      } else if (falseString.equalsIgnoreCase(sourceValue)) {
        return false;
      }
    }
    if (StringUtil.isEmpty(sourceValue)) {
      return null;
    }
    throw new IllegalArgumentException("Not a boolean value: " + sourceValue);
  }

}