error handle: EncoderException

src/main/java/encoding/Encoder.java

@@ -36,9 +36,9 @@ public class Encoder {
      *  @param reserveFromBack	默认情况下，左右指针都指向数组的最右侧，表示totalReserve指定的所有空间都是预留给 Prepend* 操作的
      * 							reserveFromBack 可以指定需要预留多少空间给 Append*操作
      */
-    public boolean encoderReset(SizeT totalReserve,SizeT reserveFromBack){
+    public boolean encoderReset(SizeT totalReserve,SizeT reserveFromBack) throws EncoderException{
         if(reserveFromBack.compareTo(totalReserve)>0){
-            return false;
+            throw new EncoderException("encoderReset: reserveFromBack > totalReserve");
         }
         this.isInitial=true;
         this.isEstimator=false;
@@ -47,7 +47,7 @@ public class Encoder {
         try {
             len=totalReserve.getVlIntValue2Int();
         } catch (VlIntException e) {
-            throw new Error("Encoder.encoderReset: "+e.getMessage());
+            throw new EncoderException("encoderReset: "+e.getMessage());
         }
         this.buffer=new byte[len]; //todo: 特殊情况下，可能越界。
         this.left= (int) (totalReserve.subtract(reserveFromBack)-1);//todo: 特殊情况下，可能越界。
@@ -106,7 +106,7 @@ public class Encoder {
             this.left--;
             return 1;
         }else{
-            return 0;
+            return -1;
         }
     }
 
@@ -124,7 +124,7 @@ public class Encoder {
             this.right++;
             return 1;
         }else{
-            return 0;
+            return -1;
         }
     }
 
@@ -153,7 +153,7 @@ public class Encoder {
      * @param uint64_value
      * @return
      */
-    public int prependNonNegativeInteger(long uint64_value){
+    public int prependNonNegativeInteger(long uint64_value) throws EncoderException {
         byte[] bytes=buildNonNegativeIntegerArr(uint64_value);
         return this.prependByteArray(bytes,new SizeT(bytes.length));
     }
@@ -164,7 +164,7 @@ public class Encoder {
      * @param uint64_value
      * @return
      */
-    public int appendNonNegativeInteger(long uint64_value){
+    public int appendNonNegativeInteger(long uint64_value) throws EncoderException {
         byte[] bytes=buildNonNegativeIntegerArr(uint64_value);
         return this.appendByteArray(bytes,new SizeT(bytes.length));
     }
@@ -174,31 +174,31 @@ public class Encoder {
      * @param size
      * @return 返回插入成功的字节数
      */
-    public int prependByteArray(byte[] array,SizeT size){
+    public int prependByteArray(byte[] array,SizeT size) throws EncoderException {
         if(check(size)&&(size.compareTo(array.length)<=0)){
             if(this.isEstimator){
                 this.left-=array.length;
                 try {
                     return size.getVlIntValue2Int();
                 } catch (VlIntException e) {
-                    throw new Error("Encoder.prependByteArray: "+e.getMessage());
+                    throw new EncoderException("prependByteArray: "+e.getMessage());
                 }
             }else{
                 try {
                     System.arraycopy(array,0,this.buffer,
                             this.left-size.getVlIntValue2Int()+1,size.getVlIntValue2Int());
                 } catch (VlIntException e) {
-                    throw new Error("Encoder.prependByteArray: "+e.getMessage());
+                    throw new EncoderException("prependByteArray: "+e.getMessage());
                 }
                 this.left-=array.length;
                 try {
                     return size.getVlIntValue2Int();
                 } catch (VlIntException e) {
-                    throw new Error("Encoder.prependByteArray: "+e.getMessage());
+                    throw new EncoderException("prependByteArray: "+e.getMessage());
                 }
             }
         }
-        return 0;
+        return -1;
     }
 
     /**
@@ -206,31 +206,31 @@ public class Encoder {
      * @param size
      * @return 返回插入成功的字节数
      */
-    public int appendByteArray(byte[] array,SizeT size){
+    public int appendByteArray(byte[] array,SizeT size) throws EncoderException {
         if(check(size)&&(size.compareTo(array.length)<=0)){
             if(this.isEstimator){
                 this.right+=array.length;
                 try {
                     return size.getVlIntValue2Int();
                 } catch (VlIntException e) {
-                    throw new Error("Encoder.appendByteArray: "+e.getMessage());
+                    throw new EncoderException("appendByteArray: "+e.getMessage());
                 }
             }else{
                 try {
                     System.arraycopy(array,0,this.buffer,
                             this.right,size.getVlIntValue2Int());
                 } catch (VlIntException e) {
-                    throw new Error("Encoder.appendByteArray: "+e.getMessage());
+                    throw new EncoderException("appendByteArray: "+e.getMessage());
                 }
                 this.right+=array.length;
                 try {
                     return size.getVlIntValue2Int();
                 } catch (VlIntException e) {
-                    throw new Error("Encoder.appendByteArray: "+e.getMessage());
+                    throw new EncoderException("appendByteArray: "+e.getMessage());
                 }
             }
         }
-        return 0;
+        return -1;
     }
 
     /**
@@ -238,7 +238,7 @@ public class Encoder {
      * @param varNumber
      * @return
      */
-    public int prependVarNumber(VlInt varNumber){
+    public int prependVarNumber(VlInt varNumber) throws EncoderException {
          return this.prependByteArray(varNumber.getVlIntBytes(),new SizeT(varNumber.size()));
     }
 
@@ -247,7 +247,7 @@ public class Encoder {
      * @param varNumber
      * @return
      */
-    public int appendVarNumber(VlInt varNumber){
+    public int appendVarNumber(VlInt varNumber) throws EncoderException {
         return this.appendByteArray(varNumber.getVlIntBytes(),new SizeT(varNumber.size()));
     }
 
@@ -260,7 +260,7 @@ public class Encoder {
      * @param size
      * @return
      */
-    public int prependByteArrayBlock(VlInt tlvType,byte[] array,SizeT size){
+    public int prependByteArrayBlock(VlInt tlvType,byte[] array,SizeT size) throws EncoderException {
         int totalLength=this.prependByteArray(array,size);
         totalLength+=this.prependVarNumber(new VlInt(size));
         totalLength+=this.prependVarNumber(tlvType);
@@ -274,12 +274,12 @@ public class Encoder {
      * @param size
      * @return
      */
-    public int appendByteArrayBlock(VlInt tlvType,byte[] array,SizeT size){
+    public int appendByteArrayBlock(VlInt tlvType,byte[] array,SizeT size) throws EncoderException {
         int totalLength=this.appendByteArray(array,size);
         try {
             totalLength+=this.appendVarNumber(new VlInt(size.getVlIntValue2Long()));
         } catch (VlIntException e) {
-            throw new Error("Encoder.appendByteArrayBlock: "+e.getMessage());
+            throw new EncoderException("appendByteArrayBlock: "+e.getMessage());
         }
         totalLength+=this.appendVarNumber(tlvType);
         return totalLength;
@@ -290,7 +290,7 @@ public class Encoder {
      * @param block
      * @return
      */
-    public int prependBlock(Block block){
+    public int prependBlock(Block block) throws EncoderException {
         return this.prependByteArrayBlock(block.getType(),block.getValue(),new SizeT(block.getLength()));
     }
 
@@ -299,7 +299,7 @@ public class Encoder {
      * @param block
      * @return
      */
-    public int appendBlock(Block block){
+    public int appendBlock(Block block) throws EncoderException {
         return this.appendByteArrayBlock(block.getType(),block.getValue(),new SizeT(block.getLength()));
     }
 

src/main/java/encoding/EncoderException.java

@@ -0,0 +1,14 @@
+package encoding;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 9:46 2021/3/18
+ * @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 EncoderException extends Exception{
+    public EncoderException(String msg){
+        super("Encoder."+msg);
+    }
+}

src/main/java/encoding/VlInt.java

@@ -198,7 +198,7 @@ public class VlInt {
         if(this.size()<4){
             return VlIntValue.intValue();
         }
-        throw new VlIntException("value大于int能表示的范围");
+        throw new VlIntException("getVlIntValue2Int: out of int bound.");
     }
 
     /**
@@ -210,7 +210,7 @@ public class VlInt {
         if(this.size()<= 9){
             return VlIntValue.longValue();
         }
-        throw new VlIntException("value大于long能表示的范围");
+        throw new VlIntException("getVlIntValue2Long: out of long bound.");
     }
 
     /**

src/main/java/encoding/VlIntException.java

@@ -9,6 +9,6 @@ package encoding;
  */
 public class VlIntException extends Exception{
     public VlIntException(String msg){
-        super(msg);
+        super("VlInt."+msg);
     }
 }