--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/visualizer/Data/src/com/sun/hotspot/igv/data/Source.java	Tue Feb 07 22:41:09 2012 +0100
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+package com.sun.hotspot.igv.data;
+
+import java.util.*;
+
+/**
+ *
+ * @author Thomas Wuerthinger
+ */
+public class Source {
+
+    private List<InputNode> sourceNodes;
+    private Set<Integer> set;
+
+    public Source() {
+        sourceNodes = new ArrayList<>(1);
+        set = new LinkedHashSet<>(1);
+    }
+
+    public List<InputNode> getSourceNodes() {
+        return Collections.unmodifiableList(sourceNodes);
+    }
+
+    public Set<Integer> getSourceNodesAsSet() {
+        return Collections.unmodifiableSet(set);
+    }
+
+    public void addSourceNode(InputNode n) {
+        if (!set.contains(n.getId())) {
+            sourceNodes.add(n);
+            set.add(n.getId());
+        }
+    }
+
+    public interface Provider {
+
+        public Source getSource();
+    }
+
+    public void addSourceNodes(Source s) {
+        for (InputNode n : s.getSourceNodes()) {
+            addSourceNode(n);
+        }
+    }
+}