Mark classes of deprecated messages with @deprecated. (#876)

* Mark classes of deprecated messages with @deprecated

* Revert breaking changes

* Create a dedicated xml for java test

Author: ratcashdev

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

@@ -1657,6 +1657,10 @@ private static CharSequence generateDeclaration(
         final StringBuilder sb = new StringBuilder();
 
         generateTypeJavadoc(sb, BASE_INDENT, typeToken);
+        if (typeToken.deprecated() > 0)
+        {
+            sb.append("@Deprecated\n");
+        }
         sb.append("@SuppressWarnings(\"all\")\n")
             .append("public final class ").append(className).append(implementsString).append('\n')
             .append("{\n");

sbe-tool/src/test/java/uk/co/real_logic/sbe/generation/java/JavaGeneratorTest.java

@@ -458,6 +458,29 @@ public void shouldGenerateRepeatingGroupCountLimits() throws Exception
         assertEquals(65534, maxValue.invoke(null));
     }
 
+    @Test
+    public void shouldMarkDeprecatedClasses() throws Exception
+    {
+        final ParserOptions options = ParserOptions.builder().stopOnError(true).build();
+        final MessageSchema schema = parse(Tests.getLocalResource("deprecated-msg-test-schema.xml"), options);
+        final IrGenerator irg = new IrGenerator();
+        ir = irg.generate(schema);
+
+        outputManager.clear();
+        outputManager.setPackageName(ir.applicableNamespace());
+
+        generator().generate();
+        final String encoderFqcn = ir.applicableNamespace() + ".DeprecatedMessageEncoder";
+        final Class<?> encoderClazz = compile(encoderFqcn);
+        assertNotNull(encoderClazz);
+        assertTrue(encoderClazz.isAnnotationPresent(Deprecated.class));
+
+        final String decoderFqcn = ir.applicableNamespace() + ".DeprecatedMessageDecoder";
+        final Class<?> decoderClazz = compile(decoderFqcn);
+        assertNotNull(decoderClazz);
+        assertTrue(decoderClazz.isAnnotationPresent(Deprecated.class));
+    }
+
     private Class<?> getModelClass(final Object encoder) throws ClassNotFoundException
     {
         final String className = "Model";

sbe-tool/src/test/resources/deprecated-msg-test-schema.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<sbe:messageSchema xmlns:sbe="http://fixprotocol.io/2016/sbe"
+                   package="since.deprecated"
+                   id="876"
+                   version="4"
+                   semanticVersion="5.2"
+                   description="Issue 876 - Test case for Deprecated messages for Java"
+                   byteOrder="littleEndian">
+    <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>
+    </types>
+    <sbe:message name="DeprecatedMessage" id="1" semanticType="n/a" description="Message deprecated since version 3" deprecated="3">
+        <field name="v1" id="1" type="uint64" />
+    </sbe:message>
+</sbe:messageSchema>