1 files changed, 49 insertions, 0 deletions
diff --git a/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/util/CollectionsUtil.java b/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/util/CollectionsUtil.java
new file mode 100644
index 0000000000..64e8826f76
--- /dev/null
+++ b/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/util/CollectionsUtil.java
@@ -0,0 +1,49 @@
+/*
+ * 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.tuscany.das.rdb.util;
+
+import java.util.Collection;
+import java.util.Iterator;
+
+/**
+ */
+public final class CollectionsUtil {
+
+    private CollectionsUtil() {
+        
+    }
+    
+    // Utilities
+    public static boolean disjoint(Collection c1, Collection c2) {
+      
+        if (c1.size() > c2.size()) {
+          Collection c = c1;
+          c1 = c2;
+          c2 = c;
+        }
+        for (Iterator iterator = c2.iterator(); iterator.hasNext();) {
+          Object o = (Object)iterator.next();
+          if (c1.contains(o)) {
+            return false;
+          }
+        }
+        return true;
+    }
+
+}