1 files changed, 86 insertions, 0 deletions
diff --git a/framework/src/onos/core/net/src/main/java/org/onosproject/net/link/impl/BasicLinkOperator.java b/framework/src/onos/core/net/src/main/java/org/onosproject/net/link/impl/BasicLinkOperator.java
new file mode 100644
index 00000000..a6b08f62
--- /dev/null
+++ b/framework/src/onos/core/net/src/main/java/org/onosproject/net/link/impl/BasicLinkOperator.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2014-2015 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.net.link.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.time.Duration;
+
+import org.onosproject.net.AnnotationKeys;
+import org.onosproject.net.config.ConfigOperator;
+import org.onosproject.net.config.basics.BasicLinkConfig;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.Link;
+import org.onosproject.net.SparseAnnotations;
+import org.onosproject.net.link.DefaultLinkDescription;
+import org.onosproject.net.link.LinkDescription;
+import org.slf4j.Logger;
+
+/**
+ * Implementations of merge policies for various sources of link configuration
+ * information. This includes applications, provides, and network configurations.
+ */
+public final class BasicLinkOperator implements ConfigOperator {
+
+    private static final long DEF_BANDWIDTH = -1L;
+    private static final Duration DEF_DURATION = Duration.ofNanos(-1L);
+    private static final Logger log = getLogger(BasicLinkOperator.class);
+
+    private BasicLinkOperator() {
+    }
+
+    /**
+     * Generates a LinkDescription containing fields from a LinkDescription and
+     * a LinkConfig.
+     *
+     * @param cfg the link config entity from network config
+     * @param descr a LinkDescription
+     * @return LinkDescription based on both sources
+     */
+    public static LinkDescription combine(BasicLinkConfig cfg, LinkDescription descr) {
+        if (cfg == null) {
+            return descr;
+        }
+
+        // cfg.type() defaults to DIRECT, so there is a risk of unwanted override.
+        // do we want this behavior?
+        Link.Type type = descr.type();
+        if (cfg.type() != type) {
+            type = cfg.type();
+        }
+
+        SparseAnnotations sa = combine(cfg, descr.annotations());
+        return new DefaultLinkDescription(descr.src(), descr.dst(), type, sa);
+    }
+
+    /**
+     * Generates an annotation from an existing annotation and LinkConfig.
+     *
+     * @param cfg the link config entity from network config
+     * @param an the annotation
+     * @return annotation combining both sources
+     */
+    public static SparseAnnotations combine(BasicLinkConfig cfg, SparseAnnotations an) {
+        DefaultAnnotations.Builder b = DefaultAnnotations.builder();
+        if (cfg.latency() != DEF_DURATION) {
+            b.set(AnnotationKeys.LATENCY, cfg.latency().toString());
+        }
+        if (cfg.bandwidth() != DEF_BANDWIDTH) {
+            b.set(AnnotationKeys.BANDWIDTH, String.valueOf(cfg.bandwidth()));
+        }
+        return DefaultAnnotations.union(an, b.build());
+    }
+}