Setting default values in OpenInstaller

I've been playing with openinstaller.  In particular I was trying to understand how the 'eval' and 'eval-engine' attributes worked.  With some effort I was disappointed to find that the functionality for eval-engine is not currently implemented nor is there is no way to pass the classpath of my class to the engine.

I was able to get 'eval' to work.  I discovered that there is a strict format for it.  The word 'target' is a keyword and MUST be used in conjunction with any of the predefined variables (see below).  The format MUST be ":[target:<predefined varable>]"  If this format is not used there are 3 possible results.  One, the text itself is considered the default value and displayed.  Two, the text resolves to "".  Three, the text causes a silent error and the default value '/tmp/x' is used.

  example
        <prop oor:name="TRG_DOMAIN" oor:type="xs:string">
            <value if:eval=":[target:sys.homeDir]"  >/tmp/x</value>
                :
                :
        </prop>


  Another keyword is 'component'  it is used when identifying a component name.

  example
        <prop oor:name="TRG_DOMAIN" oor:type="xs:string">
            <value if:eval=":[component:SomeComponent.group.username]"  >/tmp/x</value>
        </prop>


  There is also a keyword 'engine'.  It is unclear how this is to be used.



NOTE:

     I found some out of date JavaDoc information in TargetToken about the supported predefined variables.  Two variables are incorrectly stated.  Here is the correct information.

correct  incorrect
        sys.homeDir       sys.raHomeDir       displays the system property user.dir
        sys.tmpDir          sys.raHomeDir       displays the system property java.io.tmpdir


correct as listed
        sys.hostName                                    Host name of host
        sys.ipAddress                                    IP Address of host
        sys.OSName                                     OS name
        sys.OSVersion                                  OS version
        sys.OSArch                                      OS architecture
        sys.userName                                   Current user's login account name
       *sys.userDir                                      The current directory from which the engine was invoked
(sys.userDir always returns '/'.  This may because the engine is invoked from a shell script)

Posted at 05:44PM Feb 24, 2009 by rsearls in Sun  |  Comments[0]