消息构造器

最新推荐文章于 2025-06-01 13:42:10 发布

name_feng_yun

最新推荐文章于 2025-06-01 13:42:10 发布

阅读量130

点赞数

CC 4.0 BY-SA版权

分类专栏： Java

本文链接：https://blog.youkuaiyun.com/name_feng_yun/article/details/84292572

Java 专栏收录该内容

12 篇文章

订阅专栏

本文深入探讨了消息数组构建器的实现细节，包括容量设置、元素追加、字节操作等核心功能，提供了全面的使用指南。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

public class MessageArrayBuilder {
    private int capacity = 20;

    private int length = 0;

    public void setCapacity(int capacity) {
        if (capacity > 0) {
            this.capacity = capacity;
        }
    }

    public MessageArrayBuilder() {}

    public MessageArrayBuilder(int capacity) {
        setCapacity(capacity);
    }

    private byte[] array = new byte[capacity];
    private int index = 0 ;

    public MessageArrayBuilder append(byte b) {
        if (index >= array.length) {
            byte[] newArray = new byte[array.length + capacity];
            System.arraycopy(array, 0, newArray, 0, array.length);
            array = newArray;
        }
        array[index] = b;
        index++;
        return this;
    }

    public MessageArrayBuilder append(byte[] array) {
        for (byte b : array) {
            append(b);
        }
        return this;
    }

    public MessageArrayBuilder append(String string) {
        return append(string.getBytes(Charset.forName("GBK")));
    }

    public void addByte(int i){
        append(intToByte(i)[0]);
    }

    public void addDWORD(int i){
        append(intToDWORD(i));
    }
    public int addDWORDLength(int i){
        return intToDWORD(i).length;
    }
    public void addWORD(int i){
        append(intToWORD(i));
    }
    public void addBCD(String string){
        append(hexStringToByte(string));
    }
    public int addBCDLength(String string){
        return hexStringToByte(string).length;
    }

    public void append(int paramId, String string){
        append(paramId, string , true);
    }
    public void appendBCD(int paramId, String string){
        length++;
        addWORD(paramId);
        addByte(addBCDLength(string));
        addBCD(string);
    }

    public void append(int paramId, String string, boolean fillLength){
        length++;
        addWORD(paramId);
        if(StringUtils.isBlank(string)){
            if(fillLength){
                addByte(0);
            }
            return;
        }
        addByte(string.getBytes().length);
        append(string);
    }
    public void append(int paramId, int latlng){
        length++;
        addWORD(paramId);
        addByte(addDWORDLength(latlng));
        addDWORD(latlng);
    }

    public void insertFirst(byte b){
        byte[] array = getBytes();
        byte[] newArray = new byte[array.length + capacity];
        System.arraycopy(array, 0, newArray, 1, array.length);
        newArray[0] = b;
        this.array = newArray;
        index++;
    }

    public byte[] getBytes() {
        byte[] newArray = new byte[index];
        System.arraycopy(array, 0, newArray, 0, index);
        return newArray;
    }

    public int getLength() {
        return length;
    }
}