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;
+ }
+}
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
