I have the following macro definition in Ant and I would like to pass the "cmdStatus" value outside this macro def:
<macrodef name="execEtlBinScript">
<attribute name="script" />
<sequential>
<exec executable="#{script}" resultproperty="cmdStatus"/>
</sequential>
</macrodef>
Do you have any idea if it is possible or not ?
Thank you for any help.
Kind regards,
foxrafi
In your exemple, the property cmdStatus is set and is then available outside the macrodef. But I guess that your issue is that if your call several times your macro, you don't get the next status values as properties in Ant are immutable.
The way to handle it properly is to make the result property an attribute of the macro:
<macrodef name="execEtlBinScript">
<attribute name="script" />
<attribute name="resultproperty" />
<sequential>
<exec executable="#{script}" resultproperty="#{resultproperty}"/>
</sequential>
</macrodef>
Then each call to the macrodef will get its value via a different property:
<execEtlBinScript script="somescript" resultproperty="status1" />
<echo message="Result of the first call: ${status1}" />
<execEtlBinScript script="somescript" resultproperty="status2" />
<echo message="Result of the second call: ${status2}" />
Related
How to pass multiple parameters to a target in Ant?
A macrodef is defined as shown below:
<macrodef name="execEtlBinScript">
<attribute name="script" />
<attribute name="resultproperty" />
<sequential>
<exec executable="#{script}" resultproperty="#{resultproperty}" />
</sequential>
</macrodef>
We will be passing the values like this to the above macrodef:
<execEtlBinScript script="somescript" resultproperty="status1" />
But, can I pass like this?
<execEtlBinScript script="somescript, other script" resultproperty="status1, status2" />
I need to extract a substring from property value by length, f.e. :
<property name="prop1" value="nameBLABLABLA" />
I want get the value
name
Is it possible without using javascript code ?
Not with vanilla ant, you would need to add some Ant addon like Antcontrib (latest release 2006 !) or Ant Flaka - means you'll need additional jars/libraries.
With using the jdk builtin Javascript engine it's as easy as :
<project>
<!-- create a macrodef for reuse -->
<macrodef name="getsubstring">
<attribute name="src"/>
<attribute name="from"/>
<attribute name="to"/>
<attribute name="result"/>
<sequential>
<script language="javascript">
project.setProperty(
"#{result}", "#{src}".substring(#{from},#{to})
);
</script>
</sequential>
</macrodef>
<property name="foo" value="nameBLABLABLA"/>
<getsubstring src="${foo}" from="0" to="4" result="foobar"/>
<echo> $${foobar} => ${foobar}</echo>
</project>
No additional libraries needed.
Created a macrodef that works for properties respectively for strings in general.
The JavaScript engine understands Javascript and Java and you'll get full access to Ant api.
I'd use JavaScript as in Rebse's answer, but there is a way to do this without it using <loadresource> and a <tokenfilter>. This uses start/length rather than from/to for the substring:
<macrodef name="getsubstring">
<attribute name="src"/>
<attribute name="start"/>
<attribute name="length"/>
<attribute name="result"/>
<sequential>
<loadresource property="#{result}">
<string value="#{src}}" />
<filterchain>
<tokenfilter>
<replaceregex pattern="^.{#{start}}(.{#{length}}).*" replace="\1" />
</tokenfilter>
</filterchain>
</loadresource>
</sequential>
</macrodef>
<property name="prop1" value="nameBLABLABLA" />
<getsubstring src="${prop1}" start="0" length="4" result="p"/>
<echo message="${p}" />
I have a bug in the following ant macrodef definition:
<macrodef name="xxx" description="does xxx">
<attribute name="attr1" default=""/>
<sequential>
<echo message="doing yyy"/>
<echo message="#{attr1}" file="${builddir}/zzz.xml"/>
<taskdef name="xmltask" classname="com.oopsconsultancy.xmltask.ant.XmlTask"/>
<xmltask report="true" source="${builddir}/zzz.xml">
<call path="spuds" target="process-spuds">
<param name="spud-kicker" path="#count"/>
</call>
</xmltask>
</sequential>
</macrodef>
When it tries to call the target of the call inside the xmltask, i get a null pointer exception.
What am I doing wrong?
The file zzz.xml contains (supposedly) well formed xml. It contains a top level tag called "spuds" with an attribute named count. I want to invoke the spud-kicker ant target on the spuds tag and pass the value of the count attribute to that task.
Hi all this is my code for target calling.
<target name="abc">
<var name="x" value="10"/>
<antcall target="def"/>
<!--Again Access The value of x here and also change it here-->
</target>
<target name="def">
<!--Access The value of x here and also change it here-->
</target>
and also i want to access this X in other build file,is there any way
This is not possible with ant. In an properties are immutable and cannot be reset. The var task from ant contrib can be used to override values, but should be used sparingly.
You could use a temporary file to achieve what you want. But probably you are trying something weird, which can be solved in a different way.
This would also work across buildfiles if they have access to the property file.
<target name="abc">
<var name="x" value="10"/>
<antcall target="def"/>
<!--Again Access The value of x here and also change it here-->
<var unset="true" file="myproperty.properties" /> <!-- read variable from property file-->
</target>
<target name="def">
<echo file="myproperty.properties" append="false">x=12</echo> <!-- create a new propertyfile-->
</target>
For the sake of justice, there is a hack that allows to alter ant's immutable properties without any additional libs (since java 6):
<scriptdef name="propertyreset" language="javascript"
description="Allows to assing #{property} new value">
<attribute name="name"/>
<attribute name="value"/>
project.setProperty(attributes.get("name"), attributes.get("value"));
</scriptdef>
Usage:
<target name="abc">
<property name="x" value="10"/>
<antcall target="def"/>
</target>
<target name="def">
<propertyreset name="x" value="11"/>
</target>
As #oers mentioned, this should be used with care after all canonical approaches proved not to fit.
It is difficult to suggest further without knowing the goal behind the question.
I am trying to move a file (specified by a pattern) to a given location in an Ant macrodef:
<macrodef name="extract">
<attribute name="package"/>
<sequential>
<!-- the path will contain the unique file in extracted regardless of the name -->
<path id="source_refid">
<dirset dir="${dep}/lib/#{package}/extracted/">
<include name="#{package}-*"/>
</dirset>
</path>
<!-- this is not working: properties are immutable -->
<property name="source_name" refid="source_refid"/>
<move
file="${source_name}"
tofile="${dep}/#{package}/"
overwrite="true"
/>
</sequential>
</macrodef>
This will work just once as ${source_name} is immutable.
An option would be to use the variable task but I didn't find a way to assign a refid to a var.
Is there a way to have something similar to local variable in a macrodef? Or (XY problem) is there a better way to solve my problem?
Since Ant 1.8 you can use the local task for this. For example:
<local name="source_name"/>
<property name="source_name" refid="source_refid"/>
Your example is just the sort of thing local is for!