JdkSerializer.java

package com.jarvis.cache.serializer;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Calendar;
import java.util.Date;

import com.jarvis.lib.util.BeanUtil;

public class JdkSerializer implements ISerializer<Object> {

    @Override
    public Object deserialize(byte[] bytes, Type returnType) throws Exception {
        if(null == bytes || bytes.length == 0) {
            return null;
        }
        ByteArrayInputStream inputStream=new ByteArrayInputStream(bytes);
        ObjectInputStream input=new ObjectInputStream(inputStream);
        return input.readObject();
    }

    @Override
    public byte[] serialize(Object obj) throws Exception {
        if(obj == null) {
            return new byte[0];
        }
        // 将对象写到流里
        ByteArrayOutputStream outputStream=new ByteArrayOutputStream();
        ObjectOutputStream output=new ObjectOutputStream(outputStream);
        output.writeObject(obj);
        output.flush();
        return outputStream.toByteArray();
    }

    @Override
    public Object deepClone(Object obj, final Type type) throws Exception {
        if(null == obj) {
            return obj;
        }
        Class<?> clazz=obj.getClass();
        if(BeanUtil.isPrimitive(obj) || clazz.isEnum() || obj instanceof Class || clazz.isAnnotation() || clazz.isSynthetic()) {// 常见不会被修改的数据类型
            return obj;
        }
        if(obj instanceof Date) {
            return ((Date)obj).clone();
        } else if(obj instanceof Calendar) {
            Calendar cal=Calendar.getInstance();
            cal.setTimeInMillis(((Calendar)obj).getTime().getTime());
            return cal;
        }
        return deserialize(serialize(obj), null);
    }

    @Override
    public Object[] deepCloneMethodArgs(Method method, Object[] args) throws Exception {
        if(null == args || args.length == 0) {
            return args;
        }
        Type[] genericParameterTypes=method.getGenericParameterTypes();
        if(args.length != genericParameterTypes.length) {
            throw new Exception("the length of " + method.getDeclaringClass().getName() + "." + method.getName() + " must " + genericParameterTypes.length);
        }
        Object[] res=new Object[args.length];
        int len=genericParameterTypes.length;
        for(int i=0; i < len; i++) {
            res[i]=deepClone(args[i], null);
        }
        return res;
    }
}