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Add new countMatches method 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@130883 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne 2002-12-08 15:29:59 +00:00
parent 92d67a604d
commit 35041694f4
1 changed files with 23 additions and 4 deletions
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27
src/java/org/apache/commons/collections/CollectionUtils.java
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@ -1,7 +1,7 @@
/* /*
* $Id: CollectionUtils.java,v 1.21 2002/11/24 21:11:27 scolebourne Exp $ * $Id: CollectionUtils.java,v 1.22 2002/12/08 15:29:59 scolebourne Exp $
* $Revision: 1.21 $ * $Revision: 1.22 $
* $Date: 2002/11/24 21:11:27 $ * $Date: 2002/12/08 15:29:59 $
* *
* ==================================================================== * ====================================================================
* *
@ -84,7 +84,7 @@ import org.apache.commons.collections.iterators.EnumerationIterator;
* @author Steve Downey * @author Steve Downey
* @author <a href="herve.quiroz@esil.univ-mrs.fr">Herve Quiroz</a> * @author <a href="herve.quiroz@esil.univ-mrs.fr">Herve Quiroz</a>
* @author BluePhelix@web.de (Peter) * @author BluePhelix@web.de (Peter)
* @version $Revision: 1.21 $ $Date: 2002/11/24 21:11:27 $ * @version $Revision: 1.22 $ $Date: 2002/12/08 15:29:59 $
*/ */
public class CollectionUtils { public class CollectionUtils {
@ -425,9 +425,25 @@ public class CollectionUtils {
} }
} }
/**
* Counts the number of elements in the input collection that match the predicate.
* <p>
* A <code>null</code> predicate matches no elements.
*
* @param inputCollection the collection to get the input from, may not be null
* @param predicate the predicate to use, may be null
* @return the number of matches for the predicate in the collection
* @throws NullPointerException if the input collection is null
*/
public static int countMatches(Collection inputCollection, Predicate predicate) {
return select(inputCollection, predicate).size();
}
/** /**
* Selects all elements from input collection which match the given predicate * Selects all elements from input collection which match the given predicate
* into an output collection. * into an output collection.
* <p>
* A <code>null</code> predicate matches no elements.
* *
* @param inputCollection the collection to get the input from, may not be null * @param inputCollection the collection to get the input from, may not be null
* @param predicate the predicate to use, may be null * @param predicate the predicate to use, may be null
@ -467,6 +483,8 @@ public class CollectionUtils {
/** /**
* Selects all elements from inputCollection which don't match the given predicate * Selects all elements from inputCollection which don't match the given predicate
* into an output collection * into an output collection
* <p>
* A <code>null</code> predicate matches no elements.
* *
* @param inputCollection the collection to get the input from, may not be null * @param inputCollection the collection to get the input from, may not be null
* @param predicate the predicate to use, may be null * @param predicate the predicate to use, may be null
@ -499,6 +517,7 @@ public class CollectionUtils {
} }
} }
} }
/** /**
* Transforms all elements from inputCollection with the given transformer * Transforms all elements from inputCollection with the given transformer
* and adds them to the outputCollection. * and adds them to the outputCollection.