ONOS-2161 Add OVSDB adapter api in south bound.

Change-Id: I01e2976769b225444ab6fb94cb2fe9d26921ba1f
diff --git a/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbBridge.java b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbBridge.java
new file mode 100644
index 0000000..1ee0a36
--- /dev/null
+++ b/ovsdb/api/src/main/java/org/onosproject/ovsdb/controller/OvsdbBridge.java
@@ -0,0 +1,87 @@
+/*
+ * 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.controller;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.Objects;
+
+/**
+ * The class representing a ovsdb bridge. This class is immutable.
+ */
+public final class OvsdbBridge {
+
+    private final OvsdbBridgeName bridgeName;
+    private final OvsdbDatapathId datapathId;
+
+    /**
+     * Constructor from a OvsdbBridgeName bridgeName and a OvsdbDatapathId
+     * datapathId.
+     *
+     * @param bridgeName the bridgeName to use
+     * @param datapathId the datapathId to use
+     */
+    public OvsdbBridge(OvsdbBridgeName bridgeName, OvsdbDatapathId datapathId) {
+        checkNotNull(bridgeName, "bridgeName is not null");
+        checkNotNull(datapathId, "datapathId is not null");
+        this.bridgeName = bridgeName;
+        this.datapathId = datapathId;
+    }
+
+    /**
+     * Gets the bridge name of the bridge.
+     *
+     * @return the bridge name of the bridge
+     */
+    public OvsdbBridgeName bridgeName() {
+        return bridgeName;
+    }
+
+    /**
+     * Gets the datapathId of the bridge.
+     *
+     * @return datapathId the datapathId to use
+     */
+    public OvsdbDatapathId datapathId() {
+        return datapathId;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(bridgeName, datapathId);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof OvsdbBridge) {
+            final OvsdbBridge otherOvsdbBridge = (OvsdbBridge) obj;
+            return Objects.equals(this.bridgeName, otherOvsdbBridge.bridgeName)
+                    && Objects.equals(this.datapathId,
+                                      otherOvsdbBridge.datapathId);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this).add("bridgeName", bridgeName.value())
+                .add("datapathId", datapathId.value()).toString();
+    }
+}