Implement point to point intent compiler and cli commands to create them
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/PointToPointIntentCompiler.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/PointToPointIntentCompiler.java
new file mode 100644
index 0000000..0bd1703
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/PointToPointIntentCompiler.java
@@ -0,0 +1,105 @@
+package org.onlab.onos.net.intent.impl;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+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.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DefaultEdgeLink;
+import org.onlab.onos.net.DefaultPath;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.Path;
+import org.onlab.onos.net.host.HostService;
+import org.onlab.onos.net.intent.IdGenerator;
+import org.onlab.onos.net.intent.Intent;
+import org.onlab.onos.net.intent.IntentCompiler;
+import org.onlab.onos.net.intent.IntentExtensionService;
+import org.onlab.onos.net.intent.IntentId;
+import org.onlab.onos.net.intent.PathIntent;
+import org.onlab.onos.net.intent.PointToPointIntent;
+import org.onlab.onos.net.provider.ProviderId;
+import org.onlab.onos.net.topology.PathService;
+
+/**
+ * A intent compiler for {@link org.onlab.onos.net.intent.HostToHostIntent}.
+ */
+@Component(immediate = true)
+public class PointToPointIntentCompiler
+ implements IntentCompiler<PointToPointIntent> {
+
+ private static final ProviderId PID = new ProviderId("core", "org.onlab.onos.core", true);
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected IntentExtensionService intentManager;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected PathService pathService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected HostService hostService;
+
+ private IdGenerator<IntentId> intentIdGenerator;
+
+ @Activate
+ public void activate() {
+ IdBlockAllocator idBlockAllocator = new DummyIdBlockAllocator();
+ intentIdGenerator = new IdBlockAllocatorBasedIntentIdGenerator(idBlockAllocator);
+ intentManager.registerCompiler(PointToPointIntent.class, this);
+ }
+
+ @Deactivate
+ public void deactivate() {
+ intentManager.unregisterCompiler(PointToPointIntent.class);
+ }
+
+ @Override
+ public List<Intent> compile(PointToPointIntent intent) {
+ Path path = getPath(intent.ingressPoint(), intent.egressPoint());
+
+ List<Link> links = new ArrayList<>();
+ links.add(DefaultEdgeLink.createEdgeLink(intent.ingressPoint(), true));
+ links.addAll(path.links());
+ links.add(DefaultEdgeLink.createEdgeLink(intent.egressPoint(), false));
+
+ return Arrays.asList(createPathIntent(new DefaultPath(PID, links, path.cost() + 2,
+ path.annotations()),
+ intent));
+ }
+
+ /**
+ * Creates a path intent from the specified path and original
+ * connectivity intent.
+ *
+ * @param path path to create an intent for
+ * @param intent original intent
+ */
+ private Intent createPathIntent(Path path,
+ PointToPointIntent intent) {
+
+ return new PathIntent(intentIdGenerator.getNewId(),
+ intent.selector(), intent.treatment(),
+ path.src(), path.dst(), path);
+ }
+
+ /**
+ * Computes a path between two ConnectPoints.
+ *
+ * @param one start of the path
+ * @param two end of the path
+ * @return Path between the two
+ * @throws PathNotFoundException if a path cannot be found
+ */
+ private Path getPath(ConnectPoint one, ConnectPoint two) {
+ Set<Path> paths = pathService.getPaths(one.deviceId(), two.deviceId());
+ if (paths.isEmpty()) {
+ throw new PathNotFoundException("No path from " + one + " to " + two);
+ }
+ // TODO: let's be more intelligent about this eventually
+ return paths.iterator().next();
+ }
+}