/src/main/java/com/alibaba/fastjson/serializer/ObjectArraySerializer.java

/*
 * 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;

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

    public static final ObjectArraySerializer instance = new ObjectArraySerializer();

    public ObjectArraySerializer(){
    }

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

        Object[] array = (Object[]) object;
        
        if (object == null) {
            if (out.isEnabled(SerializerFeature.WriteNullListAsEmpty)) {
                out.write("[]");
            } else {
                out.writeNull();
            }
            return;
        }
        
        int size = array.length;

        int end = size - 1;

        if (end == -1) {
            out.append("[]");
            return;
        }

        SerialContext context = serializer.getContext();
        serializer.setContext(context, object, fieldName);
        
        try {
            Class<?> preClazz = null;
            ObjectSerializer preWriter = null;
            out.append('[');
            
            if (out.isEnabled(SerializerFeature.PrettyFormat)) {
                serializer.incrementIndent();
                serializer.println();
                for (int i = 0; i < size; ++i) {
                    if (i != 0) {
                        out.write(',');
                        serializer.println();
                    }
                    serializer.write(array[i]);
                }
                serializer.decrementIdent();
                serializer.println();
                out.write(']');
                return;
            }
            
            for (int i = 0; i < end; ++i) {
                Object item = array[i];
    
                if (item == null) {
                    out.append("null,");
                } else {
                    Class<?> clazz = item.getClass();
    
                    if (clazz == preClazz) {
                        preWriter.write(serializer, item, null, null);
                    } else {
                        preClazz = clazz;
                        preWriter = serializer.getObjectWriter(clazz);
    
                        preWriter.write(serializer, item, null, null);
                    }
    
                    out.append(',');
                }
            }
    
            Object item = array[end];
    
            if (item == null) {
                out.append("null]");
            } else {
                serializer.write(item);
                out.append(']');
            }
        } finally {
            serializer.setContext(context);
        }
    }
}