Property Precedence

["Grinvald, Edward" <ED...@ca.com>]

Hello,
	could somebody please explain to me what is the precedence of
properties in a project:
+ set in build.xml
+ specified with -D at prompt
+ from the properties file
+ is there a difference between setting a property in the xml, or calling
.setProperty() from a <script>.

Thank You,
 
Edward Grinvald
Computer Associates International
Programmer, Storage Development
Edward.Grinvald@ca.com
1-631-342-6000 x76350


-----Original Message-----
From: Marc Logemann [mailto:devlists@logemann.info] 
Sent: Wednesday, June 12, 2002 11:36 AM
To: ant-user@jakarta.apache.org
Subject: Re: parsing a task output for further processing


> If you're running Ant1.5, and assuming <tclist> has an option to write 
> its output to a file (which, if it doesn't, would definitely be bad, 
> but I suppose you could work around it in the meantime by bracketing 
> your <tclist> in a <record>):

>   <property name="app" value="maxbahr"/>

>   <target name="stopApp" depends="chkAppStatus" if="app.running">
>     <echo>Stopping ${app}...</echo>
>     <tcstop  url="${catalina.url}" username="${catalina.username}"
>              password="${catalina.password}" path="/${app}"/>
>   </target>

>   <target name="chkAppStatus">
>     <loadfile property="app.running" srcFile="tclist.out">
>       <filterchain>
>         <linecontains>
>           <contains value="/${app}:running"/>
>         </linecontains>
>       </filterchain>
>     </loadfile>
>   </target>

Diane, thx for this great solution. It seems i ve missed some important
commands in Ant like <loadfile> or <filterchain>.

Cause tclist cant output to file (IMO) i will also look up your mentioned
<record> command.




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Re: Property Precedence

[Stefan Bodewig <bo...@apache.org>]

On Wed, 12 Jun 2002, Edward Grinvald <ED...@ca.com> wrote:

> Hello, could somebody please explain to me what is the precedence of
> properties in a project: 

> + set in build.xml 
> + specified with -D at prompt 

-D wins over <property>.

The first <property> wins over a second one setting a property of the
same name.

> + from the properties file 

Not sure what you mean here.  <property file="..." />?  This has the
same precedence as <property name="..." /> repeated for all properties
in that file.

> + is there a difference between setting a property in the xml, or
> calling .setProperty() from a <script>.

Yes.  <property> will not overwrite existing properties.  setProperty
will.  Use setNewProperty to get the same behavior in scripts anf
<property>.

Stefan

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