private void printSingleField(final FieldDescriptor field, final Object value, final TextGenerator generator) throws IOException { if (field.isExtension()) { generator.print("["); // We special-case MessageSet elements for compatibility with proto1. if (field.getContainingType().getOptions().getMessageSetWireFormat() && (field.getType() == FieldDescriptor.Type.MESSAGE) && (field.isOptional()) // object equality && (field.getExtensionScope() == field.getMessageType())) { generator.print(field.getMessageType().getFullName()); } else { generator.print(field.getFullName()); } generator.print("]"); } else { if (field.getType() == FieldDescriptor.Type.GROUP) { // Groups must be serialized with their original capitalization. generator.print(field.getMessageType().getName()); } else { generator.print(field.getName()); } } if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) { if (singleLineMode) { generator.print(" { "); } else { generator.print(" {\n"); generator.indent(); } } else { generator.print(": "); } printFieldValue(field, value, generator); if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) { if (singleLineMode) { generator.print("} "); } else { generator.outdent(); generator.print("}\n"); } } else { if (singleLineMode) { generator.print(" "); } else { generator.print("\n"); } } }