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new bf8b83772a GROOVY-11808: create a DGM#groupByMany extension method
(minor refactor)
bf8b83772a is described below
commit bf8b83772aa842b00d3e6f43ea189a6753cdb08a
Author: Paul King <[email protected]>
AuthorDate: Mon Dec 1 17:12:22 2025 +1000
GROOVY-11808: create a DGM#groupByMany extension method (minor refactor)
---
.../groovy/runtime/ArrayGroovyMethods.java | 24 ++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/src/main/java/org/codehaus/groovy/runtime/ArrayGroovyMethods.java
b/src/main/java/org/codehaus/groovy/runtime/ArrayGroovyMethods.java
index 8185baddc6..5fb9754270 100644
--- a/src/main/java/org/codehaus/groovy/runtime/ArrayGroovyMethods.java
+++ b/src/main/java/org/codehaus/groovy/runtime/ArrayGroovyMethods.java
@@ -68,6 +68,7 @@ import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
+import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
@@ -4389,14 +4390,14 @@ public class ArrayGroovyMethods extends
DefaultGroovyMethodsSupport {
* Example usage finding the words with capital letters:
* <pre class="groovyTestCase">
* String[] words = ['TO', 'be', 'Or', 'nOT', 'To', 'be']
- * assert words.groupByMany(w -> w.toSet().grep(~'[A-Z]')) == [T:['TO',
'nOT', 'To'], O:['TO', 'Or', 'nOT']]
+ * assert words.groupByMany(w -> w.toSet().grep(~'[A-Z]')) == [T:['TO',
'nOT', 'To'], O:['TO', 'Or', 'nOT']]
* </pre>
*
* If the lists of generated keys are all of size 1, the result will be
the same as
* {@code groupBy} with a closure returning the value in the key list:
* <pre class="groovyTestCase">
* String[] animals = ['cat', 'dog', 'bird', 'pony']
- * assert animals.groupByMany(a -> [a.size()]) ==
animals.groupBy(String::size)
+ * assert animals.groupByMany(a -> [a.size()]) ==
animals.groupBy(String::size)
* </pre>
*
* @param self an array to group
@@ -4411,6 +4412,25 @@ public class ArrayGroovyMethods extends
DefaultGroovyMethodsSupport {
return DefaultGroovyMethods.groupByMany(Arrays.asList(self), keyFn);
}
+ /**
+ * Groups all members from the array into (sub)groups determined by the
supplied key mapping closure.
+ * The key mapping closure should return a list of keys applicable to a
member.
+ * The value returned by mapping the member with the value mapping closure
will be grouped under each key from the list.
+ *
+ * @param self an array to group
+ * @param valueFn a closure which can transform each member before
collecting
+ * @param keyFn a closure returning an Iterable of keys for each member
+ * @return a new Map from keys to lists of elements
+ * @since 6.0.0
+ */
+ public static <T, U, K> Map<K, List<U>> groupByMany(
+ T[] self,
+ @ClosureParams(FirstParam.Component.class) Closure<? extends U>
valueFn,
+ @ClosureParams(FirstParam.Component.class) Closure<? extends
Iterable<? extends K>> keyFn
+ ) {
+ return DefaultGroovyMethods.groupByMany(Arrays.asList(self), valueFn,
keyFn);
+ }
+
//--------------------------------------------------------------------------
// head
