Move EmptyEnumeration to CollectionUtils

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274781 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/RuntimeConfigurable.java

@@ -63,8 +63,8 @@ import java.util.Hashtable;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
-import java.util.NoSuchElementException;
 
+import org.apache.tools.ant.util.CollectionUtils;
 import org.xml.sax.AttributeList;
 import org.xml.sax.helpers.AttributeListImpl;
 
@@ -236,17 +236,7 @@ public class RuntimeConfigurable implements Serializable {
         if (children != null) {
             return Collections.enumeration(children);
         } else {
-            return new EmptyEnumeration();
-        }
-    }
-
-    static final class EmptyEnumeration implements Enumeration {
-        public EmptyEnumeration() {}
-        public boolean hasMoreElements() {
-            return false;
-        }
-        public Object nextElement() throws NoSuchElementException {
-            throw new NoSuchElementException();
+            return new CollectionUtils.EmptyEnumeration();
         }
     }
 

src/main/org/apache/tools/ant/Target.java

@@ -61,6 +61,8 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.StringTokenizer;
 
+import org.apache.tools.ant.util.CollectionUtils;
+
 /**
  * Class to implement a target object with required parameters.
  *
@@ -222,7 +224,7 @@ public class Target implements TaskContainer {
         if (dependencies != null) {
             return Collections.enumeration(dependencies);
         } else {
-            return new RuntimeConfigurable.EmptyEnumeration();
+            return new CollectionUtils.EmptyEnumeration();
         }
     }
 

src/main/org/apache/tools/ant/util/CollectionUtils.java

@@ -1,7 +1,7 @@
 /*
  * The Apache Software License, Version 1.1
  *
- * Copyright (c) 2002 The Apache Software Foundation.  All rights
+ * Copyright (c) 2002-2003 The Apache Software Foundation.  All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -55,6 +55,7 @@ package org.apache.tools.ant.util;
 
 import java.util.Dictionary;
 import java.util.Enumeration;
+import java.util.NoSuchElementException;
 import java.util.Vector;
 
 /**
@@ -146,4 +147,18 @@ public class CollectionUtils {
             m1.put(key, m2.get(key));
         }
     }
+
+    /**
+     * @since Ant 1.6
+     */
+    public static final class EmptyEnumeration implements Enumeration {
+        public EmptyEnumeration() {}
+        public boolean hasMoreElements() {
+            return false;
+        }
+        public Object nextElement() throws NoSuchElementException {
+            throw new NoSuchElementException();
+        }
+    }
+
 }