CODEWITHSUNDEEP
groovy
lapots
lapots

Reputation: 13415

list matching in groovy switch statement

Is there a way to achieve something like this in groovy? 

def list1 = ['trs', 'file.xlsx', 'xxx']
def list2 = ['rls', 'file.xml', 'yyy']

def switchCheck(list) {
    switch (list) {
        case ['trs',  /* matches pattern *.xlsx */ , /* any value */]:
            println "trs message"
            break
        case ['rls', /* matches pattern *.xml */ , /* any value */]:
            println "rls message"
            break
        default: 
            println "no match"
            break
    }
}

switchCheck(list1)
switchCheck(list2)

I want to check list data in the switch statement where some of its fields do not matter, while others should match a certain pattern (like ends with *.xlsx or .xml)

Upvotes: 0

Views: 541

Answers (1)

aristotll
aristotll

Reputation: 9175

I just create a demonstration example because monkey patch is evil. You can modify isCase at runtime.

isCase is the method, when groovy calls in switch statement.(Different from Java)

Just call like this:

    ... // You don't need to modify switchCheck method.
    def list2 = ['rls', 'file.xml', 'yyy']
List.metaClass.isCase = { Object switchValue ->
    if (!switchValue in List && switchValue.size() == 3) {
        false
    } else {
        switchValue.first() == delegate.first() && (switchValue[1]) in ~(createRegexFromGlob(delegate[1]))
    }

}
switchCheck(list1)

The createRegexFromGlob is copied from here.

Upvotes: 2

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