[ONOS-2408]Data model and utility class about RFC 7047 (ovsdb protocol).
The whole lib of ovsdb provides the function of encode to jasonRPC and
decode to Pojo to consumer, the bussiness of coordination of
communication is implemented by adapter.

Change-Id: I4c35426273394c1699207e5a4f2e98cead59f1e1
diff --git a/ovsdb/rfc/src/main/java/org/onosproject/ovsdb/rfc/schema/type/UuidBaseType.java b/ovsdb/rfc/src/main/java/org/onosproject/ovsdb/rfc/schema/type/UuidBaseType.java
new file mode 100644
index 0000000..9824966
--- /dev/null
+++ b/ovsdb/rfc/src/main/java/org/onosproject/ovsdb/rfc/schema/type/UuidBaseType.java
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed 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.onosproject.ovsdb.rfc.schema.type;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+import java.util.Objects;
+
+/**
+ * One of the strings "integer", "real", "boolean", "string", or "uuid",
+ * representing the specified scalar type. Refer to RFC 7047 Section 3.2.
+ */
+public final class UuidBaseType implements BaseType {
+    /**
+     * RefType is strong or weak. refer to base-type of RFC 7047 Section 3.2.
+     */
+    public enum RefType {
+        STRONG("strong"), WEAK("weak");
+
+        private String refType;
+
+        private RefType(String refType) {
+            this.refType = refType;
+        }
+
+        /**
+         * Returns the refType for RefType.
+         * @return the refType
+         */
+        public String refType() {
+            return refType;
+        }
+    }
+
+    private final String refTable;
+    private final String refType;
+
+    /**
+     * Constructs a UuidBaseType object.
+     */
+    public UuidBaseType() {
+        this.refTable = null;
+        this.refType = RefType.STRONG.refType();
+    }
+
+    /**
+     * Constructs a UuidBaseType object.
+     * @param refTable refTable constraint
+     * @param refType refType constraint
+     */
+    public UuidBaseType(String refTable, String refType) {
+        this.refTable = refTable;
+        this.refType = refType;
+    }
+
+    /**
+     * Get refTable.
+     * @return refTable
+     */
+    public String getRefTable() {
+        return refTable;
+    }
+
+    /**
+     * Get refType.
+     * @return refType
+     */
+    public String getRefType() {
+        return refType;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(refTable, refType);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof UuidBaseType) {
+            final UuidBaseType other = (UuidBaseType) obj;
+            return Objects.equals(this.refTable, other.refTable)
+                    && Objects.equals(this.refType, other.refType);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this).add("refTable", refTable)
+                .add("refType", refType).toString();
+    }
+}