beanutils.java

应用泛型以及反射编写的单表操作框架

package org.langsin.core.utils;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.Assert;

/**
 * 扩展的BeanUtils类。提供BeanUtils没有的功能
 * 
 * @author 不落的太阳
 * 
 */
public class BeanUtils extends org.apache.commons.beanutils.BeanUtils {

	protected static final Log logger = LogFactory.getLog(BeanUtils.class);

	private BeanUtils() {
	}

	/**
	 * 循环向上转型,获取对象的DeclaredField.
	 * 
	 * @throws NoSuchFieldException
	 *             如果没有该Field时抛出.
	 */
	public static Field getDeclaredField(Object object, String propertyName)
			throws NoSuchFieldException {
		Assert.notNull(object);
		Assert.hasText(propertyName);
		return getDeclaredField(object.getClass(), propertyName);
	}

	/**
	 * 循环向上转型,获取对象的DeclaredField.
	 * 
	 * @throws NoSuchFieldException
	 *             如果没有该Field时抛出.
	 */
	public static Field getDeclaredField(Class clazz, String propertyName)
			throws NoSuchFieldException {
		Assert.notNull(clazz);
		Assert.hasText(propertyName);
		for (Class superClass = clazz; superClass != Object.class; superClass = superClass
				.getSuperclass()) {
			try {
				return superClass.getDeclaredField(propertyName);
			} catch (NoSuchFieldException e) {

			}
		}
		throw new NoSuchFieldException("No such field: " + clazz.getName()
				+ '.' + propertyName);
	}

	/**
	 * 强制获取对象变量值
	 * 
	 * @param object
	 * @param propertyName
	 * @return
	 * @throws NoSuchFieldException
	 */
	public static Object forceGetProperty(Object object, String propertyName)
			throws NoSuchFieldException {
		Assert.notNull(object);
		Assert.hasText(propertyName);

		Field field = getDeclaredField(object, propertyName);

		boolean accessible = field.isAccessible();
		field.setAccessible(true);

		Object result = null;
		try {
			result = field.get(object);
		} catch (IllegalAccessException e) {
			logger.info("error wont' happen");
		}
		field.setAccessible(accessible);
		return result;
	}

	/**
	 * 强制设置对象变量值
	 * 
	 * @param object
	 * @param propertyName
	 * @param newValue
	 * @throws NoSuchFieldException
	 */
	public static void forceSetProperty(Object object, String propertyName,
			Object newValue) throws NoSuchFieldException {
		Assert.notNull(object);
		Assert.hasText(propertyName);

		Field field = getDeclaredField(object, propertyName);
		boolean accessible = field.isAccessible();
		field.setAccessible(true);
		try {
			field.set(object, newValue);
		} catch (IllegalAccessException e) {
		
		}
		field.setAccessible(accessible);
	}

	/**
	 * 按Field类型取得Field列表
	 * 
	 * @param object
	 * @param type
	 * @return
	 */
	public static List<Field> getFieldsByType(Object object, Class type) {
		List<Field> list = new ArrayList<Field>();
		Field[] fields = object.getClass().getDeclaredFields();
		for (Field field : fields) {
			if (field.getType().isAssignableFrom(type)) {
				list.add(field);
			}
		}
		return list;
	}

	/**
	 * 按FiledName获得Field的类型.
	 */
	public static Class getPropertyType(Class type, String name)
			throws NoSuchFieldException {
		return getDeclaredField(type, name).getType();
	}

}