Implement IntentCompilers

For the following Intent types

- PointToPointIntent
- PathIntent
- MultiPointToSinglePointIntent

This resolves ONOS-1657, ONOS-1659, and ONOS-1660.

Change-Id: I7c68cec4b025a59f9c97bae4488801bea2716baf
diff --git a/src/main/java/net/onrc/onos/core/newintent/PathNotFoundException.java b/src/main/java/net/onrc/onos/core/newintent/PathNotFoundException.java
new file mode 100644
index 0000000..f08636e
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/newintent/PathNotFoundException.java
@@ -0,0 +1,22 @@
+package net.onrc.onos.core.newintent;
+
+import net.onrc.onos.api.newintent.IntentException;
+
+/**
+ * An exception thrown when a path is not found.
+ */
+public class PathNotFoundException extends IntentException {
+    private static final long serialVersionUID = -2087045731049914733L;
+
+    public PathNotFoundException() {
+        super();
+    }
+
+    public PathNotFoundException(String message) {
+        super(message);
+    }
+
+    public PathNotFoundException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}