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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;

/**
 * Instantiates enum instances by their name.
 * Created: 20.08.2007 07:11:16
 *
 * @param  the enumeration type to convert to
 * @author Volker Bergmann
 */
@SuppressWarnings("rawtypes")
public class String2EnumConverter extends ThreadSafeConverter {

  /**
   * Instantiates a new String 2 enum converter.
   *
   * @param enumClass the enum class
   */
  public String2EnumConverter(Class enumClass) {
    super(String.class, enumClass);
  }

  @Override
  public E convert(String sourceValue) throws ConversionException {
    return convert(sourceValue, targetType);
  }

  /**
   * Convert t.
   *
   * @param          the type parameter
   * @param sourceValue the source value
   * @param enumClass   the enum class
   * @return the t
   * @throws ConversionException the conversion exception
   */
  public static  T convert(String sourceValue, Class enumClass) throws ConversionException {
    if (sourceValue == null) {
      return null;
    }
    T[] enumConstants = enumClass.getEnumConstants();
    for (T enumConstant : enumConstants) {
      if (enumConstant.name().equals(sourceValue)) {
        return enumConstant;
      }
    }
    throw new ConversionException(enumClass + " does not have an instance of name " + sourceValue);
  }

}