StructTest.java

package org.javolution.io;

import java.nio.ByteBuffer;

/**
 * Created by Administrator on 2017/3/10 0010.
 * 导入库
 * javolution
 */
public class StructTest {
    public static class MyStruct extends Struct {
        public final Struct.Signed32 leftAddress = new Signed32();
        public final Struct.Signed32 op = new Signed32();
        public final Struct.Signed32 rightAddress = new Signed32();
        public final Struct.Signed32 data = new Signed32();
    }


    static final int lenght = 8192;

    public static void main(String[] args) throws Exception {
        //int max = 536870912; //512mb
        MyStruct struct = new MyStruct();
        int size = struct.size();
        System.out.println("MyStruct结构体大小:" + size + "bytes");
        ByteBuffer memory = ByteBuffer.allocate(lenght);
        struct.setByteBuffer(memory, 0);
        //+:+ data:1
        //top
        int left = size - 1;
        int right = size + size - 1;
        System.out.println(left);
        System.out.println(right);
        struct.op.set('+');
        struct.leftAddress.set(size - 1);
        struct.rightAddress.set(size + size - 1);
        System.out.println(struct.getByteBufferPosition());
        System.out.println(struct);
        //left
        struct.setByteBufferPosition(size - 1);
        struct.op.set(1);
        struct.data.set(1);
        System.out.println(struct.getByteBufferPosition());
        System.out.println(struct);

        //right
        struct.setByteBufferPosition(size + size - 1);
        struct.op.set(1);
        struct.data.set(2);
        System.out.println(struct);
        System.out.println(struct.getByteBufferPosition());
        System.out.println(struct);


        //计算
        struct.setByteBufferPosition(0);
        System.out.println("结果:" + eval(struct, 0));
    }

    public static final int eval(MyStruct struct, int start) throws Exception {
        struct.setByteBufferPosition(start);
        switch (struct.op.get()) {
            case '+': {
                int leftAddress = struct.leftAddress.get();
                int left = eval(struct, leftAddress);
                
                struct.setByteBufferPosition(start);
                
                int rightAdddress = struct.rightAddress.get();
                int right = eval(struct, rightAdddress);
                return left + right;
            }
            case '-': {
                int leftAddress = struct.leftAddress.get();
                int left = eval(struct, leftAddress);
                
                struct.setByteBufferPosition(start);
                
                int rightAdddress = struct.rightAddress.get();
                int right = eval(struct, rightAdddress);
                return left - right;
            }
            case 1:
                return struct.data.get();
            default:
                break;
        }
        throw new Exception("异常");
    }
}