starting the trie utility that can contruct trie from paths

src/main/java/com/redhat/trie/Util.java

@@ -0,0 +1,65 @@
+/**
+ * Copyright (c) 2009 - 2012 Red Hat, Inc.
+ *
+ * This software is licensed to you under the GNU General Public License,
+ * version 2 (GPLv2). There is NO WARRANTY for this software, express or
+ * implied, including the implied warranties of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
+ * along with this software; if not, see
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
+ *
+ * Red Hat trademarks are not licensed under GPLv2. No permission is
+ * granted to use or replicate Red Hat trademarks that are incorporated
+ * in this software or its documentation.
+ */
+
+package com.redhat.trie;
+
+import java.util.List;
+import java.util.ArrayList;
+import java.util.StringTokenizer;
+
+public class Util {
+    public static PathNode makePathTree(List<String> contents, PathNode parent) {
+        PathNode endMarker = new PathNode();
+        for (String path : contents) {
+            StringTokenizer st = new StringTokenizer(path, "/");
+            makePathForURL(st, parent, endMarker);
+        }
+        //condenseSubTreeNodes(endMarker);
+        return parent;
+    }
+
+    private static void makePathForURL(StringTokenizer st, PathNode parent, PathNode endMarker) {
+        if (st.hasMoreTokens()) {
+            String childVal = st.nextToken();
+            if (childVal.equals("")) {
+                return;
+            }
+
+            boolean isNew = true;
+            for (NodePair child : parent.getChildren()) {
+                if (child.getName().equals(childVal) &&
+                        !child.getConnection().equals(endMarker)) {
+                    makePathForURL(st, child.getConnection(), endMarker);
+                    isNew = false;
+                }
+            }
+            if (isNew) {
+                PathNode next = null;
+                if (st.hasMoreTokens()) {
+                    next = new PathNode();
+                    parent.addChild(new NodePair(childVal, next));
+                    next.addParent(parent);
+                    makePathForURL(st, next, endMarker);
+                } else {
+                    parent.addChild(new NodePair(childVal, endMarker));
+                    if (!endMarker.getParents().contains(parent)) {
+                        endMarker.addParent(parent);
+                    }
+                }
+            }
+        }
+    }
+}
+