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From "Bengt Rodehav (JIRA)" <j...@apache.org>
Subject [jira] Created: (FELIX-2366) Avoiding property substitution by escaping does not remove escape character
Date Fri, 28 May 2010 08:55:36 GMT
Avoiding property substitution by escaping does not remove escape character
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                 Key: FELIX-2366
                 URL: https://issues.apache.org/jira/browse/FELIX-2366
             Project: Felix
          Issue Type: Bug
          Components: File Install
    Affects Versions: fileinstall-3.0.0
            Reporter: Bengt Rodehav


To avoid property substitution, an escape character was introduced in version 3.0.0 of File
Install. The idea is that if I want to send the configuration value

  ${propkey}

to my application without property substitution to take place, I can escape the START_DELIM
(${) and STOP_DELIM (}) with a backslash as follows:

  $\{propkey\}

However, when doing this the escape character is not removed from the string. The reason is
as follows:

The method of interest is substVars in class org.apache.felix.fileinstall.internal.Util. The
logic tries to find matching DELIM_START (${) and DELIM_STOP (}). When you escape either of
these (by specifying a backslash before "${" and/or "}"), the logic will never find matching
DELIM_START and DELIM_STOP which causes the method to immediately return without performing
property substitution. The logic at the end of the method (that removes the backslashes) is
never reached.

A workarount is to add an unnecessary property at the end of the value just to make sure some
property substitution will take place since then the logic at the end of the substVars() method
(that removes the escape character) will be reached. Thus, this works:

  $\{propkey\}${#}


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