add test: ReadOnlyFieldTest

src/main/java/component/MutableDangerousField.java

@@ -12,6 +12,10 @@ import encoding.*;
 public class MutableDangerousField implements TlvComponentBase, IEncodingAble {
     private ElementContainer blocks;
 
+    public MutableDangerousField(){
+        blocks=new ElementContainer();
+    }
+
     /**
      * 往可变非受保护区添加一个Block
      * @param block
@@ -24,8 +28,12 @@ public class MutableDangerousField implements TlvComponentBase, IEncodingAble {
      * 获取可变非受保护区指定位置的 Block
      * @return
      */
-    public Block getBlock(int index){
-        return this.blocks.getBlock(index);
+    public Block getBlock(int index) throws ComponentException {
+        try {
+            return this.blocks.getBlock(index);
+        } catch (BlockException e) {
+            throw new ComponentException("MutableDangerousField.getBlock: "+e.getMessage());
+        }
     }
 
     /**
@@ -47,8 +55,12 @@ public class MutableDangerousField implements TlvComponentBase, IEncodingAble {
      * 获取可变非受保护区中，第一个指定TLV-TYPE的子 TLV Block
      * @return
      */
-    public Block getBlockByType(VlInt tlvType){
-        return this.blocks.getElement(tlvType);
+    public Block getBlockByType(VlInt tlvType) throws ComponentException {
+        try {
+            return this.blocks.getElement(tlvType);
+        } catch (BlockException e) {
+            throw new ComponentException("MutableDangerousField.getBlockByType: "+e.getMessage());
+        }
     }
 
     /**
@@ -58,6 +70,7 @@ public class MutableDangerousField implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public int wireEncode(Encoder encoder) throws ComponentException {
+        try{
         // 如果可变非受保护区没有任何子 TLV，则可以去掉可变非受保护区 TLV
         if(this.blocks.length()==0){
             return -1;
@@ -68,11 +81,7 @@ public class MutableDangerousField implements TlvComponentBase, IEncodingAble {
         // 反向遍历，可以保证解码的时候正向输出
         for(int i=this.blocks.length()-1;i>=0;i++){
             int tmplen= 0;
-            try {
                 tmplen = encoder.prependBlock(this.blocks.getBlock(i));
-            } catch (EncoderException e) {
-                throw new ComponentException("MutableDangerousField.wireEncode: "+e.getMessage());
-            }
             if(tmplen<=0){
                 return -1;
             }
@@ -81,11 +90,7 @@ public class MutableDangerousField implements TlvComponentBase, IEncodingAble {
 
         // 编码 TLV-LENGTH
         int tmplen= 0;
-        try {
             tmplen = encoder.prependVarNumber(new VlInt(totalLength));
-        } catch (EncoderException e) {
-            throw new ComponentException("MutableDangerousField.wireEncode: "+e.getMessage());
-        }
         if(tmplen<=0){
             return -1;
         }
@@ -103,6 +108,9 @@ public class MutableDangerousField implements TlvComponentBase, IEncodingAble {
         totalLength+=tmplen;
 
         return totalLength;
+        } catch (EncoderException | BlockException e) {
+            throw new ComponentException("MutableDangerousField.wireEncode: "+e.getMessage());
+        }
     }
 
     /**