activemq-protobuf/src/main/java/org/apache/activemq/protobuf/compiler/AltJavaGenerator.java [579:639]:
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    private void generateMethodVisitor(MessageDescriptor m) {
        String javaVisitor = getOption(m.getOptions(), "java_visitor", null);        
        if( javaVisitor!=null ) {
            String returns = "void";
            String throwsException = null;
            
            StringTokenizer st = new StringTokenizer(javaVisitor, ":");
            String vistorClass = st.nextToken();
            if( st.hasMoreTokens() ) {
                returns = st.nextToken();
            }
            if( st.hasMoreTokens() ) {
                throwsException = st.nextToken();
            }
            
            String throwsClause = "";
            if( throwsException!=null ) {
                throwsClause = "throws "+throwsException+" ";
            }
            
            p("public "+returns+" visit("+vistorClass+" visitor) "+throwsClause+ "{");
            indent();
            if( "void".equals(returns) ) {
                p("visitor.visit(this);");
            } else {
                p("return visitor.visit(this);");
            }
            unindent();
            p("}");
            p();
        }
    }
    
    private void generateMethodType(MessageDescriptor m, String className) {
        String typeEnum = getOption(m.getOptions(), "java_type_method", null);        
        if( typeEnum!=null ) {
            
            TypeDescriptor typeDescriptor = m.getType(typeEnum);
            if( typeDescriptor == null ) {
                typeDescriptor = m.getProtoDescriptor().getType(typeEnum);
            }
            if( typeDescriptor == null || !typeDescriptor.isEnum() ) {
                errors.add("The java_type_method option on the "+m.getName()+" message does not point to valid enum type");
                return;
            }
            
            
            String constant = constantCase(className);
            EnumDescriptor enumDescriptor = (EnumDescriptor)typeDescriptor;
            if( enumDescriptor.getFields().get(constant) == null ) {
                errors.add("The java_type_method option on the "+m.getName()+" message does not points to the "+typeEnum+" enum but it does not have an entry for "+constant);
            }
            
            String type = javaType(typeDescriptor);
            
            p("public "+type+" type() {");
            indent();
                p("return "+type+"."+constant+";");
            unindent();
            p("}");
            p();
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activemq-protobuf/src/main/java/org/apache/activemq/protobuf/compiler/JavaGenerator.java [366:426]:
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    private void generateMethodVisitor(MessageDescriptor m) {
        String javaVisitor = getOption(m.getOptions(), "java_visitor", null);        
        if( javaVisitor!=null ) {
            String returns = "void";
            String throwsException = null;
            
            StringTokenizer st = new StringTokenizer(javaVisitor, ":");
            String vistorClass = st.nextToken();
            if( st.hasMoreTokens() ) {
                returns = st.nextToken();
            }
            if( st.hasMoreTokens() ) {
                throwsException = st.nextToken();
            }
            
            String throwsClause = "";
            if( throwsException!=null ) {
                throwsClause = "throws "+throwsException+" ";
            }
            
            p("public "+returns+" visit("+vistorClass+" visitor) "+throwsClause+ "{");
            indent();
            if( "void".equals(returns) ) {
                p("visitor.visit(this);");
            } else {
                p("return visitor.visit(this);");
            }
            unindent();
            p("}");
            p();
        }
    }
    
    private void generateMethodType(MessageDescriptor m, String className) {
        String typeEnum = getOption(m.getOptions(), "java_type_method", null);        
        if( typeEnum!=null ) {
            
            TypeDescriptor typeDescriptor = m.getType(typeEnum);
            if( typeDescriptor == null ) {
                typeDescriptor = m.getProtoDescriptor().getType(typeEnum);
            }
            if( typeDescriptor == null || !typeDescriptor.isEnum() ) {
                errors.add("The java_type_method option on the "+m.getName()+" message does not point to valid enum type");
                return;
            }
            
            
            String constant = constantCase(className);
            EnumDescriptor enumDescriptor = (EnumDescriptor)typeDescriptor;
            if( enumDescriptor.getFields().get(constant) == null ) {
                errors.add("The java_type_method option on the "+m.getName()+" message does not points to the "+typeEnum+" enum but it does not have an entry for "+constant);
            }
            
            String type = javaType(typeDescriptor);
            
            p("public "+type+" type() {");
            indent();
                p("return "+type+"."+constant+";");
            unindent();
            p("}");
            p();
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