1 files changed, 70 insertions, 0 deletions
diff --git a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsLabelReader.java b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsLabelReader.java
new file mode 100644
index 000000000..0644cc869
--- /dev/null
+++ b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsLabelReader.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.hc2vpp.mpls;
+
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.EntropyLabelIndicator;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.ExtensionLabel;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.GalLabel;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.ImplicitNullLabel;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.Ipv4ExplicitNullLabel;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.Ipv6ExplicitNullLabel;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.MplsLabel;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.MplsLabelSpecialPurposeValue;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.OamAlertLabel;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.routing.types.rev171204.RouterAlertLabel;
+
+/**
+ * Mixin that reads integer value of {@link MplsLabel}.
+ */
+interface MplsLabelReader {
+
+    default int getLabelValue(final MplsLabel label) {
+        if (label.getMplsLabelGeneralUse() != null) {
+            return label.getMplsLabelGeneralUse().getValue().intValue();
+        } else if (label.getMplsLabelSpecialPurpose() != null ) {
+            final Class<? extends MplsLabelSpecialPurposeValue> specialLabel =
+                label.getMplsLabelSpecialPurpose();
+            // Encoding of labels 0-3
+            // https://tools.ietf.org/html/rfc3032#section-2.1
+            if (Ipv4ExplicitNullLabel.class.equals(specialLabel)) {
+                return 0;
+            } else if (RouterAlertLabel.class.equals(specialLabel)) {
+                return 1;
+            } else if (Ipv6ExplicitNullLabel.class.equals(specialLabel)) {
+                return 2;
+            } else if (ImplicitNullLabel.class.equals(specialLabel)) {
+                return 3;
+            } else if (EntropyLabelIndicator.class.equals(specialLabel)) {
+                // https://tools.ietf.org/html/rfc6790#section-3
+                return 7;
+            } else if (GalLabel.class.equals(specialLabel)) {
+                // https://tools.ietf.org/html/rfc5586#section-4
+                return 13;
+            } else if (OamAlertLabel.class.equals(specialLabel)) {
+                // https://tools.ietf.org/html/rfc3429#section-3
+                return 14;
+            } else if (ExtensionLabel.class.equals(specialLabel)) {
+                // https://tools.ietf.org/html/rfc7274#section-3.1
+                return 15;
+            } else {
+                throw new IllegalArgumentException("Unsupported special purpose MPLS label: " + specialLabel);
+            }
+        } else {
+            throw new IllegalArgumentException("Unsupported MPLS label: " + label);
+        }
+    }
+}