scolebourne 2003/01/25 03:40:26
Modified: collections/src/test/org/apache/commons/collections
TestCollectionUtils.java
collections/src/java/org/apache/commons/collections
CollectionUtils.java
Log:
Add exists() to test if any one element in the collection matches the predicate
from Peter KoBek
Revision Changes Path
1.12 +19 -4
jakarta-commons/collections/src/test/org/apache/commons/collections/TestCollectionUtils.java
Index: TestCollectionUtils.java
===================================================================
RCS file:
/home/cvs/jakarta-commons/collections/src/test/org/apache/commons/collections/TestCollectionUtils.java,v
retrieving revision 1.11
retrieving revision 1.12
diff -u -r1.11 -r1.12
--- TestCollectionUtils.java 25 Jan 2003 11:31:12 -0000 1.11
+++ TestCollectionUtils.java 25 Jan 2003 11:40:26 -0000 1.12
@@ -459,6 +459,21 @@
assertEquals(0, CollectionUtils.countMatches(null, null));
}
+ public void testExists() {
+ List list = new ArrayList();
+ assertEquals(false, CollectionUtils.exists(null, null));
+ assertEquals(false, CollectionUtils.exists(list, null));
+ assertEquals(false, CollectionUtils.exists(null, EQUALS_TWO));
+ assertEquals(false, CollectionUtils.exists(list, EQUALS_TWO));
+ list.add("One");
+ list.add("Three");
+ list.add("Four");
+ assertEquals(false, CollectionUtils.exists(list, EQUALS_TWO));
+
+ list.add("Two");
+ assertEquals(true, CollectionUtils.exists(list, EQUALS_TWO));
+ }
+
public void testSelect() {
List list = new ArrayList();
list.add("One");
1.28 +22 -2
jakarta-commons/collections/src/java/org/apache/commons/collections/CollectionUtils.java
Index: CollectionUtils.java
===================================================================
RCS file:
/home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/CollectionUtils.java,v
retrieving revision 1.27
retrieving revision 1.28
diff -u -r1.27 -r1.28
--- CollectionUtils.java 25 Jan 2003 11:29:37 -0000 1.27
+++ CollectionUtils.java 25 Jan 2003 11:40:26 -0000 1.28
@@ -450,6 +450,26 @@
}
/**
+ * Answers true if a predicate is true for at least one element of a collection.
+ * <p>
+ * A <code>null</code> collection or predicate returns false.
+ *
+ * @param collection the collection to get the input from, may be null
+ * @param predicate the predicate to use, may be null
+ * @return true if at least one element of the collection matches the predicate
+ */
+ public static boolean exists(Collection collection, Predicate predicate) {
+ if (collection != null && predicate != null) {
+ for (Iterator it = collection.iterator(); it.hasNext();) {
+ if (predicate.evaluate(it.next())) {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ /**
* Selects all elements from input collection which match the given predicate
* into an output collection.
* <p>
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