The Software AG IDL Compiler

The Software AG IDL Compiler generates interface objects, skeletons and wrappers. It uses a Software AG IDL file and a template file that controls the generated output.

This document covers the following topics:

Introduction
Starting the IDL Compiler
IDL Compiler Usage Examples
Writing your own Wrappers and Stubs

Introduction

The IDL Compiler is used to generate stubs, skeletons and wrappers from two specific input files:

the IDL file (extension .idl), which describes the interface between client and server.
the template file (extension .tpl), which controls the generated output files and their contents. In principle the template describes the target programming language.

The IDL Compiler first reads through the IDL file and builds tables and structures that form an internal representation of the interface. If there is a related server mapping file, it is also read implicitly (see Server Mapping Files for Natural). The IDL Compiler then loops through this internal representation and uses the template file to generate its output, the source code for the target programming language.

The following wrappers use the IDL Compiler as their generation tool:

The IDL Compiler and the template files for the target programming languages above are fully integrated in the Software AG Designer. For automation purposes, the IDL Compiler can also be started at the command prompt.

Starting the IDL Compiler

Start of instruction set To start the IDL Compiler

At a command prompt, enter

Java -classpath
                                                 "%ProgramFiles%\software
                                                 ag\entirex\classes\exxidlcompiler.jar;%ProgramFiles%\software
                                                 ag\entirex\classes\saglic.jar" "-Dsagcommon=%CommonProgramFiles%\Software AG"
                                                 com/softwareag/entirex/idlcompiler/TplParser -t template file [-Doption=value]
                                                 [-Fbasename] [-Ppreprocessor variable] [-ooutput-directory] [-Ttrace-level]
                                                 [-deprecated] -idl idlfile.idl

Parameter Description

-help Displays help using the command-line options.

-D option=value

Passes the option to the templates.

See also Using Options.

-F basename Indicates that the output file base name follows. It is used as given - thus it should be provided without a path and extension. Only relevant if supported by the template used. Default is the base name of the idl-file without path and extension. See Specifying the Name of the Output File.

-t template Name of the initial template file.

-P preprocessor variable Specifies a preprocessor variable that can be controlled in template files with #ifdef, #elif, #else, and be closed by #endif. Only relevant if supported by the template used. See Using Template #if Preprocessing Statements.

-o output-directory Specifies the directory for the output file. See Specifying the Name of the Output File.

-T trace-level

Trace level	Description
Trace information is entered as comment lines into the generated output.
0	No trace output will be created. This is the default trace level.
1	Generates only template file name and the line number in the output file. This trace level helps to identify the specific line in the template file.
2	This is the full tracing mode for the template file. Every action of the IDL Compiler will be displayed.
3	Additional traces for preparation of the output statement will be created.

-deprecated Deprecated mode allows compilation of templates for statements already deprecated. Each deprecated statement will create a warning.

-idl idl-file Name of the IDL file. Multiple IDL files can be provided.

IDL Compiler Usage Examples

Calling the IDL Compiler under UNIX

The following applies to the UNIX Bourne, Korn and C shell.

$JAVA_HOME/java
                                          -Dsagcommon=/<Install_Dir>/EntireX\common\conf -Dentirex.home=$EXXDIR -classpath
                                          $EXXDIR/classes/exxidlcompiler.jar:$EXXDIR/classes/saglic.jar
                                          com/softwareag/entirex/idlcompiler/TplParser -t $EXXDIR/template/client.tpl
                                          -idl aaclient.idl

An erxidl.bsh shell script file is provided with a preconfigured invocation of the IDL Compiler. In addition, the "-deprecated" mode is set as default in this shell script file.

erxidl.bsh -t ...\EntireX\template\client.tpl -idl aaclient.idl

Calling the IDL Compiler under Windows

java -classpath "%ProgramFiles%\software
                                          ag\entirex\classes\exxidlcompiler.jar;%ProgramFiles%\software
                                          ag\entirex\classes\saglic.jar" "-Dsagcommon=%CommonProgramFiles%\Software AG"
                                          com/softwareag/entirex/idlcompiler/TplParser -t ...\EntireX\template\client.tpl
                                          -idl aaclient.idl

An erxidl.bat batch file for the Windows command shell is provided with a preconfigured invocation of the IDL Compiler. In addition, the "-deprecated" mode is set as default in this batch file.

erxidl -t ...\EntireX\template\client.tpl -idl aaclient.idl

Writing your own Wrappers and Stubs

Additional programming languages can be adopted with user-written templates (see Writing Template Files for Software AG IDL Compiler). The syntax for IDL template files in a formal notation is presented in the section Grammar for IDL Template Files.

Integration with the IDL Editor can be accomplished using the plug-in technique provided (see Custom Wrappers).