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diff --git a/opendaylight/adsal/northbound/commons/src/main/java/org/opendaylight/controller/northbound/commons/query/CompareExpression.java b/opendaylight/adsal/northbound/commons/src/main/java/org/opendaylight/controller/northbound/commons/query/CompareExpression.java
new file mode 100644
index 0000000000..6b972e641c
--- /dev/null
+++ b/opendaylight/adsal/northbound/commons/src/main/java/org/opendaylight/controller/northbound/commons/query/CompareExpression.java
@@ -0,0 +1,56 @@
+/**
+ * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.northbound.commons.query;
+
+/*package*/ class CompareExpression implements Expression {
+
+    public static enum OP { RE, EQ, NE, GT, GE, LT, LE };
+
+    private final OP _operation;
+    private final String _selector;
+    private final String _arg;
+
+    public CompareExpression(OP op, String selector, String arg) {
+        _operation = op;
+        _selector = selector;
+        _arg = unQuote(arg);
+    }
+
+
+    public OP getOperator() {
+        return _operation;
+    }
+
+    public String getSelector() {
+        return _selector;
+    }
+
+    public String getArgument() {
+        return _arg;
+    }
+
+    @Override
+    public boolean accept(Visitor visitor) throws QueryException {
+        return visitor.visit(this);
+    }
+
+    @Override
+    public String toString() {
+        return "[" + _selector + " " + _operation + " " + _arg + "]";
+    }
+
+    private static String unQuote(String s) {
+        if (s.startsWith("\"") && s.endsWith("\"")) {
+            s = s.substring(1, s.length()-1);
+        } else if (s.startsWith("\'") && s.endsWith("\'")) {
+            s = s.substring(1, s.length()-1);
+        }
+        return s;
+    }
+
+}