仅当源文件被修改时，如何执行Ant任务？

问题描述

必须有一个简单的方法来做到这一点。我使用蚂蚁构建一个依赖于SWC库的Flex应用程序，该库可以正常工作，除了重建库，无论是否需要。如果库中的任何源文件（* .as，* .mxml）比SWC更新，我该如何告诉蚂蚁才能运行该任务？

我查看了< dependet>，但它似乎只是删除文件，而不是确定是否应该运行任务。 < depend>似乎期望源文件和目标文件之间的一对一关系，而不是一对多关系 - 我有很多输入文件和一个输出文件，但没有中间目标文件。

非常感谢
Alex

解决方案

您可以使用Ant 创建属性，只有在该属性执行时才执行其他目标设置。

我不太了解flex，但你可能想要这样的东西：

 <？xml version =1.0encoding =UTF-8？> 
< project name =testdefault =compile> 
 
< target name =checkforchanges> 
< uptodate property =nochanges> 
< srcfiles dir =。包括= ** / *为/> 
< srcfiles dir =。包括= ** / * MXML/> 
< mapper to =applaton.flex/> 
< / uptodate> 
< / target> 
 
< target name =compiledepends =checkforchangesunless =nochanges> 
 ... 
< / target> 
 
< / project> 
  

There must be an easy way to do this. I build a Flex app using ant that depends on a SWC library, which works fine except that it rebuilds the library whether it needs to or not. How do I tell ant to only run the task if any of the sources files of the library (*.as, *.mxml) are newer than the SWC?

I've looked at <dependset> but it only seems to delete files, not determine whether a task should be run or not. <depend> seems to expect a one-to-one relationship between the source and target files rather than a one-to-many relationship -- I have many input files and one output file, but no intermediate object files.

Thanks a lot,Alex

解决方案

You may use the Ant uptodate task to create a property, and execute your other target only if that property is set.

I don't know much about flex, but you probably want something like this:

<?xml version="1.0" encoding="UTF-8"?>
<project name="test" default="compile">

   <target name="checkforchanges">
      <uptodate property="nochanges">
         <srcfiles dir="." includes="**/*.as"/>
         <srcfiles dir="." includes="**/*.mxml"/>
         <mapper to="applicaton.flex"/>
      </uptodate>
   </target>

   <target name="compile" depends="checkforchanges" unless="nochanges">
      ...
   </target>

</project>

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