Ant if else condition

Question

Is there an if else condition that I can use for an Ant task   This is what i have written so far    lt target name  prepare-copy  description  copy file based on condition  gt           lt echo gt Get file based on condition lt  echo gt       lt copy file    some dir  true  todir      if  true   gt   lt  target gt    The script above will copy the file if a condition is true  What if the condition is false and I wish to copy another file  Is that possible in Ant   I could pass a param to the above task and make sure the param that s passed is

User · Answer

You can also do this with ant contrib s if task    lt if gt       lt equals arg1    condition   arg2  true   gt       lt then gt           lt copy file    some dir  file  todir    another dir    gt       lt  then gt       lt elseif gt           lt equals arg1    condition   arg2  false   gt           lt then gt               lt copy file    some dir  differentFile  todir    another dir    gt           lt  then gt       lt  elseif gt       lt else gt           lt echo message  Condition was neither true nor false   gt       lt  else gt   lt  if gt

User · Answer

The quirky syntax using conditions on the target  described by Mads  is the only supported way to perform conditional execution in core ANT    ANT is not a programming language and when things get complicated I choose to embed a script within my build as follows    lt target name  prepare-copy  description  copy file based on condition  gt       lt groovy gt          if  properties  some condition       true                 ant copy file    properties  some dir    true   todir                     lt  groovy gt   lt  target gt    ANT supports several languages  See script task   my preference is Groovy because of it s terse syntax and because it plays so well with the build    Apologies  David I am not a fan of ant-contrib

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lt project name  Build  basedir     default  clean  gt       lt property name  default build type  value   Release   gt        lt target name  clean  gt       lt echo gt Value Buld is now    PARAM BUILD TYPE  is set lt  echo gt           lt condition property  build type  value    PARAM BUILD TYPE   else    default build type   gt               lt isset property  PARAM BUILD TYPE   gt           lt  condition gt           lt echo gt Value Buld is now    PARAM BUILD TYPE  is set lt  echo gt          lt echo gt Value Buld is now    build type  is set lt  echo gt       lt  target gt   lt  project gt    In my Case DPARAM BUILD TYPE Debug if it is supplied than  I need to build for for Debug otherwise i need to go for building Release build   I write like above condition it worked and i have tested as below it is working fine for me   And property   build type  we can pass this to other target or macrodef for processing which i am doing in my other ant macrodef   D   gt ant -DPARAM BUILD TYPE Debug Buildfile  D  build xml clean        echo  Value Buld is now  Debug is set       echo  Value Buld is now  Debug is set       echo  Value Buld is now  Debug is set main  BUILD SUCCESSFUL Total time  0 seconds D   gt ant Buildfile  D  build xml clean        echo  Value Buld is now    PARAM BUILD TYPE  is set       echo  Value Buld is now    PARAM BUILD TYPE  is set       echo  Value Buld is now  Release is set main  BUILD SUCCESSFUL Total time  0 seconds   It work for me to implement condition so posted hope it will helpful

User · Answer

Since ant 1 9 1 you can use a if set condition   https   ant apache org manual ifunless html

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The if attribute does not exist for  lt copy gt   It should be applied to the  lt target gt    Below is an example of how you can use the depends attribute of a target and the if and unless attributes to control execution of dependent targets  Only one of the two should execute    lt target name  prepare-copy  description  copy file based on condition      depends  prepare-copy-true  prepare-copy-false  gt   lt  target gt    lt target name  prepare-copy-true  description  copy file based on condition      if  copy-condition  gt       lt echo gt Get file based on condition being true lt  echo gt       lt copy file    some dir  true  todir       gt   lt  target gt    lt target name  prepare-copy-false  description  copy file based on false condition       unless  copy-condition  gt       lt echo gt Get file based on condition being false lt  echo gt       lt copy file    some dir  false  todir       gt   lt  target gt    If you are using ANT 1 8   then you can use property expansion and it will evaluate the value of the property to determine the boolean value  So  you could use if    copy-condition   instead of if  copy-condition    In ANT 1 7 1 and earlier  you specify the name of the property  If the property is defined and has any value  even an empty string   then it will evaluate to true

[ant] Ant if else condition?

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