CODEWITHSUNDEEP
javagroovycollections
Loom
Loom

Reputation: 9996

Create a map from an Iterable<Map.Entry> in groovy

I need to fill map with Iterable<Map.Entry>. The following is an original java code:

Iterable<Map.Entry<String, String>> conf;
Iterator<Map.Entry<String, String>> itr = conf.iterator();
Map<String, String> map = new HashMap<String, String>();
while (itr.hasNext()) {
    Entry<String, String> kv = itr.next();
    map.put(kv.getKey(), kv.getValue());
}

I have to rewrite it in groovy. Is there a concise groovy-way to do it?

Upvotes: 1

Views: 1468

Answers (2)

Mene
Mene

Reputation: 3809

I'd use collectEntries for that. It's similar to collect, but it's purpose is to create a Map.

def sourceMap = ["key1": "value1", "key2": "value2"]
Iterable<Map.Entry<String, String>> conf = sourceMap.entrySet()

def map = conf.collectEntries {
    [(it.key): it.value]
}

Note the round braces around it.key that allow you to use a variable reference as key of the newly generated Entry.

Upvotes: 2

Nitin Dhomse
Nitin Dhomse

Reputation: 2622

In Groovy you can use the each closure instead of Iterator as follows

Map<Map.Entry<String, String>> sourceMap = ["key1" : "value1", "key2" : "value2"]
Map<Map.Entry<String, String>> targetMap = [:]
sourceMap.each{ key, value ->
targetMap[key] = value
}

println ​targetMap

Working example here : https://groovyconsole.appspot.com/script/5100319096700928

Upvotes: 1

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