Intent domain for multiple domains (incubation)

Added new fields to IntentResource.

Note: The multi-domain work will be reverted after this commit
for simiplicity in Emu.

Change-Id: Ia642ba14e138b15dd6c8a1c74eb34fa8293931aa
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/DomainTunnelId.java b/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/DomainTunnelId.java
new file mode 100644
index 0000000..430823c
--- /dev/null
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/tunnel/DomainTunnelId.java
@@ -0,0 +1,92 @@
+/*
+ * 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.incubator.net.tunnel;
+
+/**
+ * A wrapper class for a long used to identify domain level tunnels.
+ */
+public final class DomainTunnelId {
+
+    private final long value;
+
+    /**
+     * Creates a tunnel identifier from the specified tunnel.
+     *
+     * @param value long value
+     * @return domain tunnel identifier
+     */
+    public static DomainTunnelId valueOf(long value) {
+        return new DomainTunnelId(value);
+    }
+
+    /**
+     * Creates a tunnel identifier from the specified tunnel.
+     *
+     * @param value long value as a string
+     * @return domain tunnel identifier
+     */
+    public static DomainTunnelId valueOf(String value) {
+        return new DomainTunnelId(Long.parseLong(value));
+    }
+
+    /**
+     * Constructor for serializer.
+     */
+    protected DomainTunnelId() {
+        this.value = 0;
+    }
+
+    /**
+     * Constructs the Domain ID corresponding to a given long value.
+     *
+     * @param value the underlying value of this domain ID
+     */
+    public DomainTunnelId(long value) {
+        this.value = value;
+    }
+
+    /**
+     * Returns the backing value of this domain ID.
+     *
+     * @return the long value
+     */
+    public long id() {
+        return value;
+    }
+
+    @Override
+    public int hashCode() {
+        return Long.hashCode(value);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof DomainTunnelId)) {
+            return false;
+        }
+        DomainTunnelId that = (DomainTunnelId) obj;
+        return this.value == that.value;
+    }
+
+    @Override
+    public String toString() {
+        return "0x" + Long.toHexString(value);
+    }
+}