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Posted to dev@commons.apache.org by sc...@apache.org on 2002/11/24 22:11:28 UTC
cvs commit: jakarta-commons/collections/src/java/org/apache/commons/collections CollectionUtils.java
scolebourne 2002/11/24 13:11:27
Modified: collections/src/java/org/apache/commons/collections
CollectionUtils.java
Log:
Add selectRejected methods, from BluePhelix@web.de (Peter)
Revision Changes Path
1.21 +40 -4 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 1.20
retrieving revision 1.21
diff -u -r1.20 -r1.21
--- CollectionUtils.java 24 Nov 2002 16:23:21 -0000 1.20
+++ CollectionUtils.java 24 Nov 2002 21:11:27 -0000 1.21
@@ -83,6 +83,7 @@
* @author Stephen Colebourne
* @author Steve Downey
* @author <a href="herve.quiroz@esil.univ-mrs.fr">Herve Quiroz</a>
+ * @author BluePhelix@web.de (Peter)
* @version $Revision$ $Date$
*/
public class CollectionUtils {
@@ -463,6 +464,41 @@
}
}
+ /**
+ * Selects all elements from inputCollection which don't match the given predicate
+ * into an output collection
+ *
+ * @param inputCollection the collection to get the input from, may not be null
+ * @param predicate the predicate to use, may be null
+ * @return the elements <b>not</b> matching the predicate (new list)
+ * @throws NullPointerException if the input collection is null
+ */
+ public static Collection selectRejected(Collection inputCollection, Predicate predicate) {
+ ArrayList answer = new ArrayList(inputCollection.size());
+ selectRejected(inputCollection, predicate, answer);
+ return answer;
+ }
+
+ /**
+ * Selects all elements from inputCollection which don't match the given predicate
+ * and adds them to outputCollection
+ *
+ * @param inputCollection the collection to get the input from, may be null
+ * @param predicate the predicate to use, may be null
+ * @param outputCollection the collection to output into, may not be null
+ * @return the outputCollection with the the elements <b>not</b> matching the predicate added
+ * @throws NullPointerException if the input collection is null
+ */
+ public static void selectRejected(Collection inputCollection, Predicate predicate, Collection outputCollection) {
+ if (inputCollection != null && predicate != null) {
+ for (Iterator iter = inputCollection.iterator(); iter.hasNext();) {
+ Object item = iter.next();
+ if (predicate.evaluate(item) == false) {
+ outputCollection.add(item);
+ }
+ }
+ }
+ }
/**
* Transforms all elements from inputCollection with the given transformer
* and adds them to the outputCollection.
--
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