/*
* Copyright 2010 Alibaba Group Holding Limited.
* 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.alibaba.toolkit.util.enumeration;
import com.alibaba.toolkit.util.typeconvert.ConvertChain;
import com.alibaba.toolkit.util.typeconvert.ConvertFailedException;
import com.alibaba.toolkit.util.typeconvert.Converter;
/**
* ������ת����<code>FlagSet</code>.
*
* <ul>
* <li>
* ��������Ѿ���<code>targetType</code>��, ֱ�ӷ���.
* </li>
* <li>
* ���Ž�����ת����<code>FlagSet.getUnderlyingType</code>����, ����ɹ�, �ض�Ӧ��<code>FlagSet</code>.
* </li>
* <li>
* �����Ĭ��ֵ, ���׳���Ĭ��ֵ��<code>ConvertFailedException</code>
* </li>
* <li>
* ����, �Ѷ��ݸ���һ��<code>Converter</code>����.
* </li>
* </ul>
*
*
* @version $Id: FlagSetConverter.java,v 1.1 2003/07/03 07:26:20 baobao Exp $
* @author Michael Zhou
*/
public class FlagSetConverter implements Converter {
public Object convert(Object value, ConvertChain chain) {
Class targetType = chain.getTargetType();
if (targetType.isInstance(value)) {
return value;
}
if (!FlagSet.class.isAssignableFrom(targetType)) {
return chain.convert(value);
}
FlagSet flagSet = null;
try {
flagSet = (FlagSet) targetType.newInstance();
} catch (Exception e) {
return new ConvertFailedException();
}
try {
Object flagSetValue = chain.getConvertManager()
.asTypeWithoutDefaultValue(flagSet.getUnderlyingClass(),
value);
flagSet.setValue(flagSetValue);
} catch (ConvertFailedException e) {
if (e.isDefaultValueSet()) {
flagSet.setValue(e.getDefaultValue());
throw new ConvertFailedException(e).setDefaultValue(flagSet);
}
return chain.convert(value);
}
return flagSet;
}
}