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Common and utility library for the Service Grid Server Software and java web services.

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/*
 * $Id: BeanToPropertyTransformer.java 182 2010-10-02 03:16:36Z t-nakaguchi $
 *
 * This is a program for Language Grid Core Node. This combines multiple language resources and provides composite language services.
 * Copyright (C) 2005-2008 NICT Language Grid Project.
 *
 * This program is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation, either version 2.1 of the License, or (at 
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this program. If not, see .
 */
package jp.go.nict.langrid.commons.transformer;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * 
 * 
 * @author Takao Nakaguchi
 * @author $Author: t-nakaguchi $
 * @version $Revision: 182 $
 */
public class BeanToPropertyTransformer
implements Transformer{
	/**
	 * 
	 * 
	 */
	public BeanToPropertyTransformer(
			Class beanClass, String propName, Class propClass)
	throws NoSuchMethodException
	{
		getter = beanClass.getMethod(
				"get" + propName.substring(0, 1).toUpperCase()
				+ propName.substring(1)
				);
		if(!propClass.isAssignableFrom(getter.getReturnType())){
			throw new ClassCastException("cannot cast " + getter.getReturnType()
					+ " to " + propClass);
		}
	}

	@SuppressWarnings("unchecked")
	public U transform(T value) throws TransformationException {
		try{
			return (U)getter.invoke(value);
		} catch(IllegalAccessException e){
			throw new TransformationException(e);
		} catch(InvocationTargetException e){
			throw new TransformationException(e);
		}
	}

	private Method getter;
}