java Ant 中的目标覆盖
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Target overriding in Ant
提问by shaman.sir
Is there a possibility to literally override a target or emulate this somehow?
是否有可能从字面上覆盖目标或以某种方式模拟它？
So, when I call
所以，当我打电话
<target perform-after="release">
<do-something />
</target>
It will act like this:
它会像这样：
<target name="release">
<antcall target="release" /> <!-- call previous version, not recursion -->
<do-something />
</target>
I think it has a meaning, I'll describe on Android example:
我认为它有一个含义，我将在Android示例中描述：
We have an .xmltemplates for every build.xmlin SDK folder ({$SDK}/tools/ant/*.xml), these files are included in every generated build.xmlfor each project. There are only -pre-compile, -pre-buildand -post-compiletargets that empty and easy to override. But there is no empty -post-releasetarget, for example. Google recommends in generated build.xmlcomments just to copy-paste a target to my own build.xmland then tune it. But I think it is not ok, because if Google will change something in this target inside a template, I will never know about I am using outdated version.
我们.xml为每个build.xmlSDK 文件夹 ( {$SDK}/tools/ant/*.xml) 中的每个都有一个模板，这些文件包含在build.xml为每个项目生成的每个文件中。只有-pre-compile,-pre-build和-post-compile目标为空且易于覆盖。但是没有空的-post-release目标，例如。Google 建议在生成的build.xml评论中只是将目标复制粘贴到我自己的目标build.xml，然后对其进行调整。但我认为这是不行的，因为如果 Google 会在模板中更改此目标中的某些内容，我将永远不会知道我使用的是过时的版本。
回答by Brett Kail
See the "Target overriding" section of the importtask or the "Target rewriting" section of the includetask. In short, give the common build.xml a project name like "common", and then use "common.release" in the antcall.
请参阅导入任务的“目标覆盖”部分或包含任务的“目标重写”部分。总之，给common build.xml一个像“common”这样的项目名，然后在antcall中使用“common.release”。
I'll note that antcall isn't quite the same since it starts a new project at runtime, which means variables set by the target won't be visible later. I don't have Ant available on this machine to test, but you might try something like this to avoid the antcall:
我会注意到 antcall 并不完全相同，因为它在运行时启动一个新项目，这意味着目标设置的变量稍后将不可见。我在这台机器上没有可用的 Ant 来测试，但你可以尝试这样的事情来避免 antcall：
<target name="release" depends="common.release, -post-release"/>
