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From Aloizio Pereira da Silva <aloi...@dcc.ufmg.br>
Subject RE: Changing the properties value.
Date Thu, 16 Oct 2003 10:31:39 GMT
Thanks. I will search about <variable> to solve my problem.

            *****************************************************
            *         Federal University of Minas Gerais        *
            *          Department of Computer Science          *
            *         Master Degree in Computer Science         *
            *                                                   *
            *                 Aloizio Silva                     *
            *         http://www.dcc.ufmg.br/~aloizio          *
            *                                                   *
            *      Mobile Computer and Network Optimization     *
            *****************************************************

On Wed, 15 Oct 2003, Matt Benson wrote:

> All:  Don't forget the other option that exists;
> Antelope has a <variable> task that behaves as a
> mutable property, taking advantage of the fact that
> the immutabiility of properties is only enforced by
> code.
>
> -Matt
>
> --- "Thomas, Lee E" <Lee.E.Thomas@erac.com> wrote:
> > Here is what I came up with.
> >
> > The following example supports what Jack wrote.
> >
> > If you set a property to a certain value in a task
> > the property keeps
> > that value for the life of the task. The value is
> > seen by all other
> > tasks that the original task calls (the invocation
> > stack). On the other
> > hand if the property is originally declared in one
> > of the called tasks
> > then the property losses its definition (value) when
> > it returns to the
> > calling task.
> >
> > Thanks.
> >
> > - Lee
> >
> >
> > Ant script
> >
> ********************************************************************
> >
> > <?xml version="1.0" encoding="UTF-8"?>
> >
> >
> > <project name="leetest" default="test" basedir=".">
> >
> >
> > 	<target name="setup" description="set up property">
> >
> > 	<echo message="start of test"/>
> >
> > 	<property name="var1" value="first value"/>
> > 		<echo message="value of var1 in setup is:
> > ${var1}"/>
> >
> > 	</target>
> >
> >
> > 	<target name="test" description="test parm setting"
> > depends="setup">
> >
> > 		<echo message="value of var1 in test is:
> > ${var1}"/>
> >
> > 		<property name="var1" value="second value"/>
> > 			<echo message="value of var1 in test after
> > change is: ${var1}"/>
> >
> > 		<antcall target="test2"/>
> >
> > 		<property name="var2" value="var2 second value"/>
> >
> > 		<echo message="value of var2 in test after change
> > is:
> > ${var2}"/>
> >
> > 		<echo message="end of test"/>
> >
> > 	</target>
> >
> > 	<target name="test2" description="" >
> >
> > 	<echo message="value of var1 in test2 is:
> > ${var1}"/>
> >
> > 			<property name="var1" value="second value"/>
> > 				<echo message="value of var1 in test2
> > after change is: ${var1}"/>
> >
> > 			<property name="var2" value="var2 first value"/>
> > 				<echo message="value of var2 in test2
> > after change is: ${var2}"/>
> >
> >
> **************************************************************
> > Output of the script
> >
> > Buildfile: leetest2.xml
> >
> > setup:
> >      [echo] start of test
> >      [echo] value of var1 in setup is: first value
> >
> > test:
> >      [echo] value of var1 in test is: first value
> >      [echo] value of var1 in test after change is:
> > first value
> >
> > test2:
> >      [echo] value of var1 in test2 is: first value
> >      [echo] value of var1 in test2 after change is:
> > first value
> >      [echo] value of var2 in test2 after change is:
> > var2 first value
> >      [echo] value of var2 in test after change is:
> > var2 second value
> >      [echo] end of test
> >
> > BUILD SUCCESSFUL
> >
> >
> > 	</target>
> >
> > -----Original Message-----
> > From: Jack Woehr [mailto:jax@purematrix.com]
> > Sent: Wednesday, October 15, 2003 12:20 PM
> > To: Ant Users List
> > Subject: Re: Changing the properties value.
> >
> >
> > "Shatzer, Larry" wrote:
> >
> > > From the manual on the task <property>
> > >
> > http://ant.apache.org/manual/CoreTasks/property.html
> > >
> > > Properties are immutable: whoever sets a property
> > first freezes it for
> >
> > > the rest of the build; they are most definately
> > not variable.
> >
> > That's true but a little misleading, in view of the
> > fact that an <ant>
> > or <antcall> caller can set a property for the
> > called target and the
> > setting doesn't propagate back to the caller's
> > environment. So you can
> > have a target algorithmically setting a property
> > multiple times; these
> > are just not really the "same property".
> >
> >
> > --
> > Jack J. Woehr            # "[F]ar in the empty sky a
> > solitary esophagus
> > slept
> > http://www.well.com/~jax #  upon motionless wing;
> > everywhere brooded
> > stillness, http://www.softwoehr.com #  serenity, and
> > the peace of God."
> > - Mark Twain
> >
> >
> >
> >
> >
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> >
> >
> >
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