Ant 条件 if 在宏定义中 [英] Ant conditional if within a macrodef

问题描述

在 ant 中，我有一个宏定义.

Within ant, I have a macrodef.

假设我必须使用这个宏定义，并且如果属性 special.property 存在并且为真，那么我想在该宏定义中运行一个项目，我该怎么办?

Assuming I have to use this macrodef, and there is a item inside said macrodef that I want to run if the property special.property exists and is true, what do I do?

我现在有

<macrodef name="someName">
    <sequential>
        <someMacroDefThatSetsTheProerty  />
        <some:thingHereThatDependsOn if="special.property" />
    <sequential>
</macrodef>

哪个不起作用 - some:thingHereThatDependsOn 没有if"属性，我不能向它添加一个.

Which doesn't work - the some:thingHereThatDependsOn doesnt have an "if" attribute, and I cannot add one to it.

antcontrib 不可用.

antcontrib is not available.

有了目标，我可以给目标一个如果"，我可以用宏定义做什么?

With a target I can give the target an "if", what can I do with a macrodef?

推荐答案

在 Ant 1.9.1 及更高版本中，现在有 if 和 unless 的新实现 属性.这可能就是你的想法.

In Ant 1.9.1 and higher, there is now a new implementation of if and unless attributes. This might be what you're thinking of.

首先，您需要将它们放入您的命名空间.将它们添加到您的 标头:

First, you need to put them into your namespace. Add them to your <project> header:

<project name="myproject" basedir="." default="package"
    xmlns:if="ant:if"
    xmlns:unless="ant:unless">

现在，您几乎可以将它们添加到任何 Ant 任务或子实体中:

Now, you can add them to almost any Ant task or sub entity:

<!-- Copy over files from special directory, but only if it exists -->
<available property="special.dir.available"
    file="${special.dir} type="dir"/>

<copy todir="${target.dir}>
    <fileset dir="${special.dir}" if:true="special.dir.available"/>
    <fileset dir="${other.dir}"/>
</copy>

<!-- FTP files over to host, but only if it's on line-->
<condition property="ftp.available">
    <isreachable host="${ftp.host}"/>
</condition>

<ftp server="${ftp.host}" 
    userid="${userid}"
    passowrd="${password}"
    if:true="ftp.available">
    <fileset dir=".../>
</ftp>

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