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  4. Groovy Goodness: Turn a Map or List as String to Map or List

Groovy Goodness: Turn a Map or List as String to Map or List

In Groovy, you can turn a map or list into a string--but how do you change it back? Read on to find out.

By 
Hubert Klein Ikkink user avatar
Hubert Klein Ikkink
·
Jun. 24, 16 · Tutorial
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In a previous post we learned how to use the toListString or toMapString methods. With these methods we create a String representation of a List or Map object. With a bit of Groovy code we can take such a String object and turn it into a List or Map again.

In the following code snippet we turn the String value [abc, 123, Groovy rocks!] to a List with three items:

// Original List with three items.
def original = ['abc', 123, 'Groovy rocks!']

// Create a String representation:
// [abc, 123, Groovy rocks!]
def listAsString = original.toListString()

// Take the String value between
// the [ and ] brackets, then
// split on , to create a List
// with values.
def list = s2[1..-2].split(', ')

assert list.size() == 3
assert list[0] == 'abc'
assert list[1] == '123' // String value
assert list[2] == 'Groovy rocks!'

We can do something similar for a String value representing a map structure:

// Original Map structure.
def original = [name: 'mrhaki', age: 42]

// Turn map into String representation:
// [name:mrhaki, age:42]
def mapAsString = original.toMapString()

def map = 
    // Take the String value between
    // the [ and ] brackets.
    mapAsString[1..-2]
        // Split on , to get a List.
        .split(', ')
        // Each list item is transformed
        // to a Map entry with key/value.
        .collectEntries { entry -> 
            def pair = entry.split(':')
            [(pair.first()): pair.last()]
        }


assert map.size() == 2
assert map.name == 'mrhaki'
assert map.age == '42'

Written with Groovy 2.4.7.

Groovy (programming language) Strings Data Types

Published at DZone with permission of Hubert Klein Ikkink, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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