/*
 * Copyright 1999-2101 Alibaba Group.
 *
 * 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.alibaba.fastjson.serializer;

import java.io.IOException;
import java.lang.reflect.Type;
import java.text.SimpleDateFormat;

import com.alibaba.fastjson.JSON;

/**
 * @author wenshao<szujobs@hotmail.com>
 */
public class DateFormatSerializer implements ObjectSerializer {

    public final static DateFormatSerializer instance = new DateFormatSerializer();

    public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType) throws IOException {
        SerializeWriter out = serializer.getWriter();

        if (object == null) {
            out.writeNull();
            return;
        }
        
        String pattern = ((SimpleDateFormat) object).toPattern();

        if (out.isEnabled(SerializerFeature.WriteClassName)) {
            if (object.getClass() != fieldType) {
                out.write('{');
                out.writeFieldName(JSON.DEFAULT_TYPE_KEY);
                serializer.write(object.getClass().getName());
                out.write(',');
                out.writeFieldName("val");
                out.writeString(pattern);
                out.write('}');
                return;
            }
        }
        
        out.writeString(pattern);
    }
}
