From a1e25eefc2a2aaf2046fb20a4f26eb366e0e630a Mon Sep 17 00:00:00 2001
From: free will <2647778488@qq.com>
Date: Tue, 9 Mar 2021 17:27:10 +0800
Subject: [PATCH] finished component: Nonce

---
 src/main/java/component/FreshnessPeriod.java |   2 +-
 src/main/java/component/Nonce.java           | 104 +++++++++++++++++++
 2 files changed, 105 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/component/Nonce.java

diff --git a/src/main/java/component/FreshnessPeriod.java b/src/main/java/component/FreshnessPeriod.java
index 4156b86..bb07c1c 100644
--- a/src/main/java/component/FreshnessPeriod.java
+++ b/src/main/java/component/FreshnessPeriod.java
@@ -82,7 +82,7 @@ public class FreshnessPeriod implements TlvComponentBase,InitialAble, IEncodingA
             return false;
         }
 
-        // 读取 FreshnessPeriod
+        // 读取 value
         long value=TLV.readNonNegativeInteger(block.getValue(),0,block.getLength().getVlIntValue2Int());
         if(value<0){
             return false;
diff --git a/src/main/java/component/Nonce.java b/src/main/java/component/Nonce.java
new file mode 100644
index 0000000..1a88535
--- /dev/null
+++ b/src/main/java/component/Nonce.java
@@ -0,0 +1,104 @@
+package component;
+
+import encoding.*;
+
+import java.util.Random;
+
+/*
+ * @Author: Wang Feng
+ * @Description: 表示一个随机数 TLV 组件
+ * @Version: 1.0.0
+ * @Date: 17:13 2021/3/9
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class Nonce implements TlvComponentBase,InitialAble, IEncodingAble {
+    // 成员变量
+    private long nonce;
+
+    // 成员函数
+    public long getNonce() {
+        return this.nonce;
+    }
+
+    public void setNonce(long nonce) {
+        this.nonce = nonce;
+        this.doInitial();
+    }
+
+    /**
+     * 刷新Nonce，随机生成一个数值传递给Nonce
+     */
+    public void refreshNonce(){
+        long randomLong=Math.abs(new Random().nextLong());
+        this.setNonce(randomLong);
+    }
+
+    // 接口实现-变量区
+    private boolean initial=false;
+
+    // 接口实现-方法区
+    @Override
+    public void doInitial() {
+        initial=true;
+    }
+
+    @Override
+    public boolean isInitial() {
+        return initial;
+    }
+
+    /**
+     * 将 Nonce 线速编码为一个 TLV
+     * @param encoder
+     * @return
+     */
+    @Override
+    public int wireEncode(Encoder encoder) {
+        int totalLength=0;
+
+        // 编码 TLV-VALUE
+        int tmplen=encoder.prependNonNegativeInteger(this.nonce);
+        if(tmplen==0){
+            return 0;
+        }
+        totalLength+=tmplen;
+
+        // 编码 TLV-LENGTH
+        tmplen+=encoder.prependVarNumber(new VlInt(totalLength));
+        if(tmplen==0){
+            return 0;
+        }
+        totalLength+=tmplen;
+
+        // 编码 TLV-TYPE
+        tmplen+=encoder.prependVarNumber(new VlInt(TLV.TlvNonce));
+        if(tmplen==0){
+            return 0;
+        }
+        totalLength+=tmplen;
+
+        return totalLength;
+    }
+
+    /**
+     * 从 TLV Block 中解码出一个 Nonce
+     * @param block
+     * @return
+     */
+    @Override
+    public boolean wireDecode(Block block) {
+        // 检查 Type 是否正确
+        if(!TLV.expectType(block.getTlvType(),new VlInt(TLV.TlvNonce))){
+            return false;
+        }
+
+        // 读取 value
+        long value=TLV.readNonNegativeInteger(block.getValue(),0,block.getLength().getVlIntValue2Int());
+        if(value<0){
+            return false;
+        }
+        this.setNonce(value);
+
+        return true;
+    }
+}