[英]Groovy - expanding list into closure arguments
Is it possible to have a list and use it as an argument for a closure signature that instead several variables? 是否有可能有一个列表并将其用作闭包签名的参数,而不是几个变量? The reason is that I have to call a closure from java code, and the java code won't know what variables the groovy closure needs.
原因是我必须从java代码调用一个闭包,而java代码不知道groovy闭包需要什么变量。
This is better served with an example. 用一个例子可以更好地服务。
Say I have a 'closure repository', where each closure might have different signatures. 假设我有一个'闭包存储库',每个闭包可能有不同的签名。 EG:
例如:
closures = [
closureA: { int a, String b ->
a.times {
System.err.println(b);
}
},
closureB: { int a, int b, String c ->
(a+b).times {
System.err.println(c);
}
}
]
Then I've got a method that I'm exposing to my java code to call these closures: 然后我有一个方法,我正在暴露于我的java代码来调用这些闭包:
def tryClosureExpansion(String whichClosure, Object ... args) {
def c = closures[whichClosure]
c.call(args) // DOESNT COMPILE !
}
And it Java I'd call this method like this: 而Java我会像这样调用这个方法:
// these calls will happen from Java, not from Groovy
tryClosureExpansion("closureA", 1, "Hello");
tryClosureExpansion("closureB", 1, 5, "Hello more");
See above on the line that doesn't compile. 请参见上面未编译的行。 I feel like groovy is 'groovy' enough to handle something like this.
我觉得groovy是'groovy'足以处理这样的事情。 Any alternative that might fly?
任何可能会飞的替代品?
Does: 请问:
c.call( *args )
Work? 工作? Not at a computer atm to test it
不是在计算机上测试它
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