蚂蚁检查存在于一组文件 [英] Ant check existence for a set of files

问题描述

在蚂蚁，我怎么能检查是否存在或不是一组文件（路径逗号分隔的列表）的？

In ant, how can i check if a set of files (comma-separated list of paths) exist or not?

例如我需要检查是否存在 myprop 中列出的所有路径，如果是的话我想设置一个属性 pathExist ：

For example I need to check if all paths listed in myprop exist and if so i want to set a property pathExist:

<property name="myprop" value="path1,path2,path3"/>

因此​​在本例中所有的路径1 路径2 path3时必须存在设置 pathExist 到真正，否则假

So in the example all of path1 path2 path3 must exist to set pathExist to true, otherwise false.

我发现了一个单一的资源，我可以使用 resourceexist 的任务，但我无法弄清楚如何使用用逗号分隔的路径列表。

I discovered that for a single resource I can use the resourceexist task, but i can't figure out how to use that with a comma-separated list of paths.

我如何检查是否存在一组路径？谢谢！

How can I check the existence for a set of paths? Thanks!

推荐答案

您可以使用的组合文件清单： ， 限制 和条件任务这一点。

You can use a combination of a filelist, restrict and condition task for this.

在下面的示例文件列表是从文件的逗号分隔的列表中的属性创建。使用限制不存在的文件的列表中找到。这被放置在如果所有的文件中找到，这将是一空的属性

In the below example a filelist is created from the property with the comma-separated list of files. Using restrict a list of the files that don't exist is found. This is placed in a property which will be empty if all the files are found.

<property name="myprop" value="path1,path2,path3"/>
<filelist id="my.files" dir="." files="${myprop}" />

<restrict id="missing.files">
  <filelist refid="my.files"/>
  <not>
    <exists/>
  </not>
</restrict>

<property name="missing.files" refid="missing.files" />
<condition property="pathExist" value="true" else="false">
    <length string="${missing.files}" length="0" />
</condition>
<echo message="Files all found: ${pathExist}" />

您可以使用像这样生成一个失败消息，列出丢失的文件：

You could use something like this to generate a failure message listing the missing files:

<fail message="Missing files: ${missing.files}">
    <condition>
        <length string="${missing.files}" when="greater" length="0" />
    </condition>
</fail>

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