CODEWITHSUNDEEP
grailsgroovy
EdgeCase
EdgeCase

Reputation: 4827

Grails Search Map

I am a Java programmer trying to write some Groovy code.

I want to iterate through the map called loginAttributevalues, and for each key (e.g. username) find the cross-reference attribute value and print this:

john : display_name

However, I am having trouble getting my Java brain around the Groovy syntax. Can someone point me in the right direction? Thanks.

loginAttributeValues = [username: 'john', email: '[email protected]']

def mapXref = [username: 'display_name',
               firstname: 'first_name',
               lastname: 'last_name',
               email: 'email'}



for (String x : loginAttributeValues) {
    if (mapXref[x])
        println(mapXref.get(x))
}

Upvotes: 0

Views: 168

Answers (2)

dmahapatro
dmahapatro

Reputation: 50245

loginAttributeValues = [username: 'john', email: '[email protected]']

def mapXref = [username: 'display_name',
               firstname: 'first_name',
               lastname: 'last_name',
               email: 'email']


def newMap = [:]
loginAttributeValues.each {k, v ->
     newMap << (k in mapXref.keySet() ? [(v): mapXref[k]] : [:])
}

assert newMap.'john' == 'display_name'
assert newMap.'[email protected]' == 'email'

I hope you need a map like

[john:display_name, [email protected]:email]

but why do you need a value john as a key and display_name as value. should not it be otherwise. In that case, you would need

newMap << (k in mapXref.keySet() ? [mapXref[k] : v] : [:])

which would assert as 

assert newMap.display_name == 'john'
assert newMap.email == '[email protected]'

Note:-
If it is guaranteed that loginAttributeValues will have keys subset of the keys in mapXref, then the logic can be optimized as below 

def newMap = loginAttributeValues.collectEntries{k, v ->
    [v, mapXref[k]]
}

Upvotes: 0

Andrew Eisenberg
Andrew Eisenberg

Reputation: 28737

This should work for you:

loginAttributeValues.each {
    if (mapXref[it])
        println(mapXref.get(it))
}

The Java for : each syntax is not valid in groovy. You are best of using an each closure.

Or, if you really want to keep the for loop syntax, then substitute in for :.

Upvotes: 1

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