Velocity代码生成：检查是否输入了$foreach？
我尝试修改用于代码生成的 vsl 文件，以检查是否实际进入了 foreach 循环以及是否要执行初始化代码。我尝试了类似java的.length> 0 但这不起作用：
myMethod() {
#if (${reference.attributes}.length > 0)
[some init code]
#foreach ($attribute in ${reference.attributes})
#some_macro($attribute)
#end
[some other code related to stuff created in the
#end
}
正确的方法是什么？
谢谢。
I try to modify a vsl file for code generation to check whether a foreach loop is actually entered and the initialization code is to be performed at all. I tried java-like .length > 0 but that does not work:
myMethod() {
#if (${reference.attributes}.length > 0)
[some init code]
#foreach ($attribute in ${reference.attributes})
#some_macro($attribute)
#end
[some other code related to stuff created in the
#end
}
What's the correct way?
Thanks.
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调用
size()方法。这适用于集合和数组（从 Velocity 1.6+ 开始）。Call the
size()method. This will work on both collections and arrays (as of Velocity 1.6+).#foreach ($foo in $bar) $foo #end Or if you want to iterate over a number range: #foreach ($number in [1..34]) $number #end#foreach ($foo in $bar) $foo #end Or if you want to iterate over a number range: #foreach ($number in [1..34]) $number #end