1 files changed, 73 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Last.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Last.java
new file mode 100644
index 00000000..312271b2
--- /dev/null
+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Last.java
@@ -0,0 +1,73 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You 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 java.util.List;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Project;
+import org.apache.tools.ant.types.Resource;
+import org.apache.tools.ant.types.ResourceCollection;
+
+/**
+ * ResourceCollection that contains the last <code>count</code> elements of
+ * another ResourceCollection, a la the UNIX tail command.
+ * @since Ant 1.7.1
+ */
+public class Last extends SizeLimitCollection {
+
+    /**
+     * Take the last <code>count</code> elements.
+     * @return a Collection of Resources.
+     */
+    protected Collection<Resource> getCollection() {
+        int count = getValidCount();
+        ResourceCollection rc = getResourceCollection();
+        int i = count;
+        Iterator<Resource> iter = rc.iterator();
+        int size = rc.size();
+        for (; i < size; i++) {
+            iter.next();
+        }
+
+        List<Resource> al = new ArrayList<Resource>(count);
+        for (; iter.hasNext(); i++) {
+            al.add(iter.next());
+        }
+        int found = al.size();
+        if (found == count || (size < count && found == size)) {
+            return al;
+        }
+
+        //mismatch:
+        String msg = "Resource collection " + rc + " reports size " + size
+            + " but returns " + i + " elements.";
+
+        //size was understated -> too many results; warn and continue:
+        if (found > count) {
+            log(msg, Project.MSG_WARN);
+            return al.subList(found - count, found);
+        }
+        //size was overstated; we missed some and are now in error-land:
+        throw new BuildException(msg);
+    }
+
+}