com.feilong.excel.util.CloneUtil Maven / Gradle / Ivy

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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.

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/*
 * Copyright (C) 2008 feilong
 *
 * 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.feilong.excel.util;

import java.util.Map;

/**
 * The Class CloneUtil.
 *
 * @author feilong
 * @since 3.0.0
 */
public class CloneUtil{

    /** Don't let anyone instantiate this class. */
    private CloneUtil(){
        //AssertionError不是必须的. 但它可以避免不小心在类的内部调用构造器. 保证该类在任何情况下都不会被实例化.
        //see 《Effective Java》 2nd
        throw new AssertionError("No " + getClass().getName() + " instances for you!");
    }

    //---------------------------------------------------------------

    /**
     * Clone map.
     *
     * @param map
     *            the map
     * @return the map
     * @throws InstantiationException
     *             the instantiation exception
     * @throws IllegalAccessException
     *             the illegal access exception
     * @deprecated 为什么要clone?
     */
    @SuppressWarnings("unchecked")
    @Deprecated
    public static Map cloneMap(Map map) throws InstantiationException,IllegalAccessException{
        Map resultMap = map.getClass().newInstance();

        for (Map.Entry entry : map.entrySet()){
            String key = entry.getKey();
            Object value = entry.getValue();

            //---------------------------------------------------------------
            if (value == null){
                continue;
            }
            if (value instanceof Map){
                resultMap.put(key, cloneMap((Map) value));
            }else{
                resultMap.put(key, value.getClass().newInstance());
            }
        }
        return resultMap;
    }

}