Ant xmlproperty 任务.当有多个同名标签时会发生什么? [英] Ant xmlproperty task. What happens when there is more than one tag with the same name?
问题描述
我正在尝试遵循我得到的一个大型 ant 构建文件,但在这种情况下我无法理解 xmlproperty 的功能.考虑这个 xml 文件,example.xml.
I am trying to follow a large ant buildfile that I have been given, and I am having trouble understanding the functionality of xmlproperty in this case. Consider this xml file, example.xml.
<main>
<tagList>
<tag>
<file>file1</file>
<machine>machine1</machine>
</tag>
<tag>
<file>file2</file>
<machine>machine2</machine>
</tag>
</tagList>
</main>
在构建文件中,有一个任务可以简化为以下示例:
In the buildfile, there is a task which can be simplified to the following for this example:
<xmlproperty file="example.xml" prefix="PREFIX" />
据我所知,如果只有一个
元素,我可以使用 ${PREFIX> 获取
因为大致相当于这样写:
的内容.main.tagList.tag.file}
As I understand it, if there was only one <tag>
element, I could get the contents of <file>
with ${PREFIX.main.tagList.tag.file}
because it is roughly equivalent to writing this:
<property name="PREFIX.main.tagList.tag.file" value="file1"/>
但是由于有两个
,那么在这种情况下${PREFIX.main.tagList.tag.file}
的值是多少?如果它是某种列表,我如何遍历
两个值?
But as there are two <tag>
s, what is the value of ${PREFIX.main.tagList.tag.file}
in this case? If it is some sort of list, how do I iterate through both <file>
values?
我使用的是 ant 1.6.2.
I am using ant 1.6.2.
推荐答案
当多个元素具有相同的名称时,
创建一个以逗号分隔值的属性:
When multiple elements have the same name, <xmlproperty>
creates a property with comma-separated values:
<project name="ant-xmlproperty-with-multiple-matching-elements" default="run" basedir=".">
<target name="run">
<xmlproperty file="example.xml" prefix="PREFIX" />
<echo>${PREFIX.main.tagList.tag.file}</echo>
</target>
</project>
结果:
run:
[echo] file1,file2
要处理逗号分隔值,请考虑使用
任务来自第三方 Ant-Contrib 库:
To process the comma-separated values, consider using the <for>
task from the third-party Ant-Contrib library:
<project
name="ant-xmlproperty-with-multiple-matching-elements"
default="run"
basedir="."
xmlns:ac="antlib:net.sf.antcontrib"
>
<taskdef resource="net/sf/antcontrib/antlib.xml" />
<target name="run">
<xmlproperty file="example.xml" prefix="PREFIX" />
<ac:for list="${PREFIX.main.tagList.tag.file}" param="file">
<sequential>
<echo>@{file}</echo>
</sequential>
</ac:for>
</target>
</project>
结果:
run:
[echo] file1
[echo] file2
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