[ONOS-5916] Add various MappingAddress impl classes with unit tests

Change-Id: Ie373601d1406d161e8071e78cd584e5cc8b8f5af
diff --git a/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/addresses/ASMappingAddress.java b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/addresses/ASMappingAddress.java
new file mode 100644
index 0000000..b98d790
--- /dev/null
+++ b/apps/mappingmanagement/api/src/main/java/org/onosproject/mapping/addresses/ASMappingAddress.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2017-present 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.mapping.addresses;
+
+import java.util.Objects;
+
+/**
+ * Implementation of AS mapping address.
+ */
+public final class ASMappingAddress implements MappingAddress {
+
+    private final String asNumber;
+
+    /**
+     * Default constructor of ASMappingAddress.
+     *
+     * @param asNumber AS number
+     */
+    ASMappingAddress(String asNumber) {
+        this.asNumber = asNumber;
+    }
+
+    @Override
+    public Type type() {
+        return Type.AS;
+    }
+
+    /**
+     * Obtains AS number.
+     *
+     * @return AS number
+     */
+    public String asNumber() {
+        return this.asNumber;
+    }
+
+    @Override
+    public String toString() {
+        return type().toString() + TYPE_SEPARATOR + asNumber;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(type().ordinal(), asNumber);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof ASMappingAddress) {
+            ASMappingAddress that = (ASMappingAddress) obj;
+            return Objects.equals(asNumber, that.asNumber);
+        }
+        return false;
+    }
+}