If you need to get the first X elements, presumably there will be occasions where you'll need to get the last X elements. Anyway, I've been playing with Haskell recently and it's affected my thinking :)

Kev
Index: 
D:/java_projects/ant-core-trunk/src/main/org/apache/tools/ant/types/resources/Last.java
===================================================================
--- 
D:/java_projects/ant-core-trunk/src/main/org/apache/tools/ant/types/resources/Last.java
     (revision 0)
+++ 
D:/java_projects/ant-core-trunk/src/main/org/apache/tools/ant/types/resources/Last.java
     (revision 0)
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2005 The Apache Software Foundation
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+package org.apache.tools.ant.types.resources;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+
+import org.apache.tools.ant.BuildException;
+
+/**
+ * ResourceCollection that contains the last <code>count</code> elements of
+ * another ResourceCollection.
+ * @since Ant 1.7
+ */
+public class Last extends BaseResourceCollectionWrapper {
+       private static final String BAD_COUNT
+    = "count of first resources should be set to an int >= 0";
+       
+       private int count = 1;
+       
+       /**
+     * Set the number of resources to be included.
+     * @param i the count as <code>int</count>.
+     */
+    public synchronized void setCount(int i) {
+        count = i;
+    }
+
+    /**
+     * Get the number of resources to be included. Default is 1.
+     * @return the count as <code>int</count>.
+     */
+    public synchronized int getCount() {
+        return count;
+    }
+
+       protected Collection getCollection() {
+               int ct = getCount();
+        if (ct < 0) {
+            throw new BuildException(BAD_COUNT);
+        }
+        Iterator iter = getResourceCollection().iterator();
+        ArrayList al = new ArrayList(ct);
+        // note logic here reverses the order, so we have
+        // to add each element at it's original position
+        // so first element selected will be the last
+        // element from the resorce collection, and should
+        // be placed in the last position of the resulting
+        // ArrayList
+        for (int i = ct; i > 0 && iter.hasNext(); i--) {
+            al.add(i, iter.next());
+        }
+        return al;
+       }
+}

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