1 files changed, 63 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Difference.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Difference.java
new file mode 100644
index 00000000..3f3c983c
--- /dev/null
+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/types/resources/Difference.java
@@ -0,0 +1,63 @@
+/*
+ *  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.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.types.Resource;
+import org.apache.tools.ant.types.ResourceCollection;
+
+/**
+ * ResourceCollection representing the difference between
+ * two or more nested ResourceCollections.
+ * @since Ant 1.7
+ */
+public class Difference extends BaseResourceCollectionContainer {
+
+    /**
+     * Calculate the difference of the nested ResourceCollections.
+     * @return a Collection of Resources.
+     */
+    protected Collection<Resource> getCollection() {
+        List<ResourceCollection> rcs = getResourceCollections();
+        int size = rcs.size();
+        if (size < 2) {
+            throw new BuildException("The difference of " + size
+                + " resource collection" + ((size == 1) ? "" : "s")
+                + " is undefined.");
+        }
+        Set<Resource> hs = new HashSet<Resource>();
+        List<Resource> al = new ArrayList<Resource>();
+        for (ResourceCollection rc : rcs) {
+            for (Resource r : rc) {
+                if (hs.add(r)) {
+                    al.add(r);
+                } else {
+                    al.remove(r);
+                }
+            }
+        }
+        return al;
+    }
+
+}