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    1   /*
    2    * Copyright 2004-2009 the Seasar Foundation and the Others.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
    13   * either express or implied. See the License for the specific language
    14   * governing permissions and limitations under the License.
    15   */
    16  package org.seasar.cubby.converter.impl;
    17
    18  import org.seasar.cubby.action.MessageInfo;
    19  import org.seasar.cubby.converter.ConversionException;
    20  import org.seasar.cubby.converter.ConversionHelper;
    21
    22  /**
    23   * 列挙定数へ変換するコンバータです。
    24   *
    25   * @author baba
    26   */
    27  public class EnumConverter extends AbstractConverter {
    28
    29  	/**
    30  	 * {@inheritDoc}
    31  	 */
    32  	public Class<?> getObjectType() {
    33  		return Enum.class;
    34  	}
    35
    36  	/**
    37  	 * {@inheritDoc}
    38  	 */
    39  	@SuppressWarnings("unchecked")
    40  	public Object convertToObject(final Object value,
    41  			final Class<?> objectType, final ConversionHelper helper)
    42  			throws ConversionException {
    43  		if (value == null) {
    44  			return null;
    45  		}
    46  		final String name = value.toString();
    47  		try {
    48  			return Enum.valueOf((Class<? extends Enum>) objectType, name);
    49  		} catch (final IllegalArgumentException e) {
    50  			final MessageInfo messageInfo = new MessageInfo();
    51  			messageInfo.setKey("valid.enum");
    52  			throw new ConversionException(messageInfo, e);
    53  		}
    54  	}
    55
    56  	/**
    57  	 * {@inheritDoc}
    58  	 */
    59  	public String convertToString(final Object value,
    60  			final ConversionHelper helper) {
    61  		if (value == null) {
    62  			return null;
    63  		}
    64  		return Enum.class.cast(value).name();
    65  	}
    66
    67  }