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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.lib.json.processors;

import com.feilong.lib.json.JSONArray;
import com.feilong.lib.json.JSONNull;
import com.feilong.lib.json.util.JSONUtils;

/**
 * 通用的默认值处理.
 * 
 * 和 {@link DefaultDefaultValueProcessor} 相比:
 * 
 * 
 * 
 * {@link DefaultDefaultValueProcessor} 是json-lib的默认实现
 * 
 * 
 * {@link DefaultDefaultValueProcessor} 把所有的数字类型默认值设置为0,但是实际场景中, 0和null是有区别的
 * {@link DefaultDefaultValueProcessor} 把 Boolean 默认值设置为了 false,但是实际场景中, false和null是有区别的
 * 
 * 
 * 
 * 支持输出为null
 * 
 * 
 * 
 *
 * @author feilong
 * @see com.feilong.lib.json.processors.DefaultDefaultValueProcessor
 * @since 1.11.5
 * 
 * @author Andres Almiray
 */
public class DefaultDefaultValueProcessor implements DefaultValueProcessor{

    /** Static instance. */
    // the static instance works for all types
    public static final DefaultDefaultValueProcessor INSTANCE = new DefaultDefaultValueProcessor();

    /**
     * Gets the default value.
     *
     * @param type
     *            the type
     * @return the default value
     */
    @Override
    public Object getDefaultValue(Class type){
        if (JSONUtils.isArray(type)){
            return new JSONArray();
        }
        return JSONNull.getInstance();
    }
    //  jsonConfig.registerDefaultValueProcessor(Boolean.class, CommonDefaultValueProcessor.INSTANCE);
    //    //注册 包装类型的数字 默认的值
    //    Class[] wrapperNumberClasses = ConvertUtil
    //                    .toArray(Byte.class, Short.class, Integer.class, Long.class, Float.class, Double.class);
    //    //---------------------------------------------------------------
    //    for (Class klass : wrapperNumberClasses){
    //        jsonConfig.registerDefaultValueProcessor(klass, CommonDefaultValueProcessor.INSTANCE);
    //    }
}