reflectionutils.java

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package com.szhelper.pay.sql.util;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
/**
 * 
 * @author fangxiang 
 * @date 2007-5-3
 * @version 1.0
 */
public class ReflectionUtils {
	private static String GET = "get";

	public static void setFieldVlaue(Object obj, String fieldName, Object value) {
		setFieldVlaue(obj,obj.getClass(),fieldName,value);
	}
	
	private static void setFieldVlaue(Object obj,Class c, String fieldName, Object value) {	
		try {
			Field field;
			try {
				field = c.getDeclaredField(fieldName);
				field.setAccessible(true);
			} catch (NoSuchFieldException e) {
				Class superC = c.getSuperclass();
				if(!superC.getName().equals(Object.class.getName())){
					setFieldVlaue(obj,superC,fieldName,value);
				}
				return;
			}
			field.set(obj, value);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	public static Object getFieldVlaue(Object obj, String fieldName,
			Object value) {
		return getFieldVlaue(obj,obj.getClass(),fieldName,value);
	}
	
	private static Object getFieldVlaue(Object obj,Class c, String fieldName,
			Object value) {
		try {
			Field field;
			field = c.getDeclaredField(fieldName);
			field.setAccessible(true);
			String methodName = GET
					+ field.getName().substring(0, 1).toUpperCase()
					+ field.getName().substring(1);
			return obj.getClass().getMethod(methodName).invoke(obj);
		} catch (NoSuchFieldException e) {
			Class superC = c.getSuperclass();
			if(!superC.getName().equals(Object.class.getName())){
				return getFieldVlaue(obj,superC,fieldName,value);
			}
			throw new RuntimeException(e);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	public static List findNotNullField(Object obj) {
		return findNotNullField(obj,obj.getClass());
	}
	
	private static List findNotNullField(Object obj,Class c) {
		List list = new ArrayList(10);
		try {
			Field[] fields = c.getDeclaredFields();
			for (int i = 0; i < fields.length; i++) {
				fields[i].setAccessible(true);
				if (fields[i].get(obj) != null) {
					list.add(fields[i]);
				}
			}
			
			Class superC = c.getSuperclass();
			if(!superC.getName().equals(Object.class.getName())){
				list.addAll(findNotNullField(obj,superC));
			}			
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		return list;
	}
}