[英]How to check for unexpanded Ant properties
I have a property file in which the user should be free to select any property available in the Ant environment. 我有一个属性文件,用户可以在其中自由选择Ant环境中可用的任何属性。 Eg:: 例如::
property.action=${other.property}
But at run time I would need to know that property.action
is actually expanded to a value. 但是在运行时,我需要知道property.action
实际上是扩展为一个值。 However the following prints '${other.property}' three times if the referred property is not set. 但是,如果未设置所引用的属性,则以下命令将打印“ $ {other.property}”三次。
<property name="value" prop="property.action" />
<echo>
1: ${property.action}
2: ${other.property}
3: ${value}
</echo>
Its not possible to know at run time what properties the user value contains, so I cannot simply check each one using isset, if/equals, etc. (I'm using ant-contrib). 在运行时无法知道用户值包含哪些属性,因此我不能简单地使用isset,if / equals等来检查每个属性(我正在使用ant-contrib)。
I would solve this perhaps with a regex on the resulting value, check that there are no variable placeholders there. 我可能会通过对结果值使用正则表达式来解决此问题,请检查其中是否存在变量占位符。 But is there not a better solution for Java/Ant? 但是,对于Java / Ant,没有更好的解决方案吗?
Using regex was the fasted solution, w/o. 使用正则表达式是禁食的解决方案,没有。 additional scripting:: 其他脚本:
<propertyregex property="check" select="\1" defaultValue="" input="${value}" regexp=".*(\$\{[A-Za-z0-9_\.-]+\}).*" />
<fail message="User setting failure, unexpanded variable: ${value}">
<condition>
<not><equals arg1="${check}" arg2=""/></not>
</condition>
</fail>
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