SinglePoint to MultiPoint Intent initial implementation

Change-Id: I1010997ce4ea993ae34afb8dab4b6c0ae112448d
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/SinglePointToMultiPointIntentCompiler.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/SinglePointToMultiPointIntentCompiler.java
new file mode 100644
index 0000000..46689ec
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/SinglePointToMultiPointIntentCompiler.java
@@ -0,0 +1,58 @@
+package org.onlab.onos.net.intent.impl;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.Path;
+import org.onlab.onos.net.intent.Intent;
+import org.onlab.onos.net.intent.LinkCollectionIntent;
+import org.onlab.onos.net.intent.SinglePointToMultiPointIntent;
+import org.onlab.onos.net.provider.ProviderId;
+import org.onlab.onos.net.resource.LinkResourceAllocations;
+
+@Component(immediate = true)
+public class SinglePointToMultiPointIntentCompiler
+        extends ConnectivityIntentCompiler<SinglePointToMultiPointIntent> {
+
+    // TODO: use off-the-shell core provider ID
+    private static final ProviderId PID =
+            new ProviderId("core", "org.onlab.onos.core", true);
+
+    @Activate
+    public void activate() {
+        intentManager.registerCompiler(SinglePointToMultiPointIntent.class,
+                                       this);
+    }
+
+    @Deactivate
+    public void deactivate() {
+        intentManager.unregisterCompiler(SinglePointToMultiPointIntent.class);
+    }
+
+
+    @Override
+    public List<Intent> compile(SinglePointToMultiPointIntent intent,
+                                List<Intent> installable,
+                                Set<LinkResourceAllocations> resources) {
+        Set<Link> links = new HashSet<>();
+        //FIXME: need to handle the case where ingress/egress points are on same switch
+        for (ConnectPoint egressPoint : intent.egressPoints()) {
+            Path path = getPath(intent, intent.ingressPoint().deviceId(), egressPoint.deviceId());
+            links.addAll(path.links());
+        }
+
+        Intent result = new LinkCollectionIntent(intent.appId(),
+                                                 intent.selector(),
+                                                 intent.treatment(), links,
+                                                 intent.egressPoints(), null);
+
+        return Arrays.asList(result);
+    }
+}