1 files changed, 84 insertions, 0 deletions
diff --git a/framework/src/onos/core/net/src/main/java/org/onosproject/net/host/impl/BasicHostOperator.java b/framework/src/onos/core/net/src/main/java/org/onosproject/net/host/impl/BasicHostOperator.java
new file mode 100644
index 00000000..68aa27f0
--- /dev/null
+++ b/framework/src/onos/core/net/src/main/java/org/onosproject/net/host/impl/BasicHostOperator.java
@@ -0,0 +1,84 @@
+/*
+ * 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.host.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import org.slf4j.Logger;
+import org.onosproject.net.config.ConfigOperator;
+import org.onosproject.net.config.basics.BasicHostConfig;
+import org.onosproject.net.AnnotationKeys;
+import org.onosproject.net.DefaultAnnotations;
+import org.onosproject.net.SparseAnnotations;
+import org.onosproject.net.host.DefaultHostDescription;
+import org.onosproject.net.host.HostDescription;
+
+/**
+ * Implementations of merge policies for various sources of host configuration
+ * information. This includes applications, provides, and network configurations.
+ */
+public final class BasicHostOperator implements ConfigOperator {
+
+    protected static final double DEFAULT_COORD = -1.0;
+    private static final Logger log = getLogger(BasicHostOperator.class);
+
+    private BasicHostOperator() {
+    }
+
+    /**
+     * Generates a HostDescription containing fields from a HostDescription and
+     * a HostConfig.
+     *
+     * @param cfg the host config entity from network config
+     * @param descr a HostDescription
+     * @return HostDescription based on both sources
+     */
+    public static HostDescription combine(BasicHostConfig cfg, HostDescription descr) {
+        if (cfg == null) {
+            return descr;
+        }
+        SparseAnnotations sa = combine(cfg, descr.annotations());
+        return new DefaultHostDescription(descr.hwAddress(), descr.vlan(), descr.location(),
+                descr.ipAddress(), sa);
+    }
+
+    /**
+     * Generates an annotation from an existing annotation and HostConfig.
+     *
+     * @param cfg the device config entity from network config
+     * @param an the annotation
+     * @return annotation combining both sources
+     */
+    public static SparseAnnotations combine(BasicHostConfig cfg, SparseAnnotations an) {
+        DefaultAnnotations.Builder newBuilder = DefaultAnnotations.builder();
+        if (cfg.name() != null) {
+            newBuilder.set(AnnotationKeys.NAME, cfg.name());
+        }
+        if (cfg.latitude() != DEFAULT_COORD) {
+            newBuilder.set(AnnotationKeys.LATITUDE, Double.toString(cfg.latitude()));
+        }
+        if (cfg.longitude() != DEFAULT_COORD) {
+            newBuilder.set(AnnotationKeys.LONGITUDE, Double.toString(cfg.longitude()));
+        }
+        if (cfg.rackAddress() != null) {
+            newBuilder.set(AnnotationKeys.RACK_ADDRESS, cfg.rackAddress());
+        }
+        if (cfg.owner() != null) {
+            newBuilder.set(AnnotationKeys.OWNER, cfg.owner());
+        }
+        return DefaultAnnotations.union(an, newBuilder.build());
+    }
+}