org.zkybase.cmdb.util.ReflectionUtils.java Source code

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Here is the source code for org.zkybase.cmdb.util.ReflectionUtils.java

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/* 
 * Copyright 2011-2012 the original author or authors.
 * 
 * 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 org.zkybase.cmdb.util;

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

import org.springframework.beans.BeanUtils;

/**
 * @author Willie Wheeler (willie.wheeler@gmail.com)
 */
public class ReflectionUtils {

    public static <T> T newInstance(Class<T> clazz) {
        try {
            return clazz.newInstance();
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T, U> U copySimpleProperties(T from, U to) {
        try {
            PropertyDescriptor[] fromDescs = BeanUtils.getPropertyDescriptors(from.getClass());
            for (PropertyDescriptor fromDesc : fromDescs) {
                String propName = fromDesc.getName();
                PropertyDescriptor toDesc = BeanUtils.getPropertyDescriptor(to.getClass(), propName);
                if (toDesc != null) {
                    Method readMethod = fromDesc.getReadMethod();
                    Object value = readMethod.invoke(from);
                    boolean write = (value instanceof Long || value instanceof String);
                    if (write) {
                        Method writeMethod = toDesc.getWriteMethod();
                        writeMethod.invoke(to, value);
                    }
                }
            }
            return to;
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }
}