Issue #488. Don't deference a null characterEncoding

build.gradle

@@ -524,6 +524,7 @@ task(generateGolangCodecsWithXSD, type: JavaExec) {
             'sbe-tool/src/test/resources/issue435.xml',
             'sbe-tool/src/test/resources/issue472.xml',
             'sbe-tool/src/test/resources/issue483.xml',
+            'sbe-tool/src/test/resources/issue488.xml',
             'sbe-tool/src/test/resources/since-deprecated-test-schema.xml',
             'sbe-tool/src/test/resources/example-bigendian-test-schema.xml',
             'gocode/resources/example-composite.xml',

gocode/Makefile

@@ -68,7 +68,7 @@ test: $(DEP)
 		go install \
 		;done))
 	(export GOPATH=$(GOPATH) && \
-		(for t in baseline-bigendian mktdata group_with_data group_with_data_extension composite_elements composite since-deprecated simple issue435 issue472; do \
+		(for t in baseline-bigendian mktdata group_with_data group_with_data_extension composite_elements composite since-deprecated simple issue435 issue472 issue483 issue488; do \
 		cd $(GOPATH)/src/$$t && \
 		go build && \
 		go fmt && \

gocode/src/issue483/Issue483_test.go

@@ -7,23 +7,23 @@ import (
 func TestPresence(t *testing.T) {
 	issue483 := new(Issue483)
 
-    if issue483.UnsetMetaAttribute(4) != "required" {
-        t.Log("Unset attribute's presence should be 'required'")
-        t.Fail()
-    }
+	if issue483.UnsetMetaAttribute(4) != "required" {
+		t.Log("Unset attribute's presence should be 'required'")
+		t.Fail()
+	}
 
-    if issue483.RequiredMetaAttribute(4) != "required" {
-        t.Log("Required attribute's presence should be 'required'")
-        t.Fail()
-    }
+	if issue483.RequiredMetaAttribute(4) != "required" {
+		t.Log("Required attribute's presence should be 'required'")
+		t.Fail()
+	}
 
-    if issue483.ConstantMetaAttribute(4) != "constant" {
-        t.Log("Constant attribute's presence should be 'constant'")
-        t.Fail()
-    }
+	if issue483.ConstantMetaAttribute(4) != "constant" {
+		t.Log("Constant attribute's presence should be 'constant'")
+		t.Fail()
+	}
 
-    if issue483.OptionalMetaAttribute(4) != "optional" {
-        t.Log("Optional attribute's presence should be 'optional'")
-        t.Fail()
-    }
+	if issue483.OptionalMetaAttribute(4) != "optional" {
+		t.Log("Optional attribute's presence should be 'optional'")
+		t.Fail()
+	}
 }

gocode/src/issue488/Issue488_test.go

@@ -0,0 +1,18 @@
+package issue488
+
+import (
+	"testing"
+)
+
+func TestPresence(t *testing.T) {
+	issue488 := new(Issue488)
+	v := new(VarDataEncoding)
+	issue488.VarData = make([]uint8, 3)
+	issue488.VarData[0] = v.VarDataMinValue()
+	issue488.VarData[1] = 42
+	issue488.VarData[2] = v.VarDataMaxValue()
+	if err := issue488.RangeCheck(0, 0); err != nil {
+		t.Log("RangeCheck failed", err)
+		t.Fail()
+	}
+}

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/golang/GolangGenerator.java

@@ -210,29 +210,34 @@ private void generateCharacterEncodingRangeCheck(
         final String varName,
         final Token token)
     {
-        switch (token.encoding().characterEncoding())
+        final String characterEncoding = token.encoding().characterEncoding();
+
+        if (null != characterEncoding)
         {
-            case "ASCII":
-                this.imports.add("fmt");
-                sb.append(String.format(
-                    "\tfor idx, ch := range %1$s {\n" +
-                    "\t\tif ch > 127 {\n" +
-                    "\t\t\treturn fmt.Errorf(\"%1$s[%%d]=%%d" +
-                    " failed ASCII validation\", idx, ch)\n" +
-                    "\t\t}\n" +
-                    "\t}\n",
-                    varName));
-                break;
+            switch (token.encoding().characterEncoding())
+            {
+                case "ASCII":
+                    this.imports.add("fmt");
+                    sb.append(String.format(
+                        "\tfor idx, ch := range %1$s {\n" +
+                        "\t\tif ch > 127 {\n" +
+                        "\t\t\treturn fmt.Errorf(\"%1$s[%%d]=%%d" +
+                        " failed ASCII validation\", idx, ch)\n" +
+                        "\t\t}\n" +
+                        "\t}\n",
+                        varName));
+                    break;
 
-            case "UTF-8":
-                this.imports.add("errors");
-                this.imports.add("unicode/utf8");
-                sb.append(String.format(
-                    "\tif !utf8.Valid(%1$s[:]) {\n" +
-                    "\t\treturn errors.New(\"%1$s failed UTF-8 validation\")\n" +
-                    "\t}\n",
-                    varName));
-                break;
+                case "UTF-8":
+                    this.imports.add("errors");
+                    this.imports.add("unicode/utf8");
+                    sb.append(String.format(
+                        "\tif !utf8.Valid(%1$s[:]) {\n" +
+                        "\t\treturn errors.New(\"%1$s failed UTF-8 validation\")\n" +
+                        "\t}\n",
+                        varName));
+                    break;
+            }
         }
     }
 

sbe-tool/src/test/resources/issue488.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<sbe:messageSchema xmlns:sbe="http://fixprotocol.io/2016/sbe"
+                   package="issue488"
+                   id="488"
+                   version="0"
+                   semanticVersion="1.0"
+                   description="issue 488 test case"
+                   byteOrder="bigEndian">
+    <types>
+        <composite name="messageHeader" description="Message identifiers and length of message root">
+            <type name="blockLength" primitiveType="uint16"/>
+            <type name="templateId" primitiveType="uint16"/>
+            <type name="schemaId" primitiveType="uint16"/>
+            <type name="version" primitiveType="uint16"/>
+        </composite>
+        <composite name="varDataEncoding">
+            <type name="length" primitiveType="uint32" maxValue="1073741824"/>
+            <type name="varData" primitiveType="uint8" length="0"/>
+        </composite>
+    </types>
+    <sbe:message name="issue488" id="1" description="issue 483 test">
+        <data name="varData" type="varDataEncoding" id="2"/>
+    </sbe:message>
+</sbe:messageSchema>