nacx commented on this pull request.

Just a couple minor comments. Thanks @btrishkin!

> +import org.jclouds.dimensiondata.cloudcontrol.domain.Server;
+import 
org.jclouds.dimensiondata.cloudcontrol.domain.internal.ServerWithExternalIp;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+@Singleton
+public class ServerToServerWithExternalIp implements Function<Server, 
ServerWithExternalIp> {
+
+    private final DimensionDataCloudControlApi api;
+
+    @Inject
+    ServerToServerWithExternalIp(DimensionDataCloudControlApi api) {
+        this.api = checkNotNull(api, "api");

Remove the redundant null check. Injection already enforces it.

> +      server = null;
+      ServerWithExternalIp result = new 
ServerToServerWithExternalIp(dimensionDataCloudControlApi).apply(server);
+      assertNull(result);
+   }
+
+   @Test(dependsOnMethods = "testServerToServerWithExternalIpApplyNotNull")
+   public void testServerToServerWithExternalIpApplyNetworkInfoNull() {
+      server = 
Server.builder().id("serverId").name("serverName").datacenterId("NA1").networkInfo(null).cpu(cpu)
+            
.deployed(true).state(State.NORMAL).sourceImageId("imageId").started(false).createTime(new
 Date())
+            
.memoryGb(1024).guest(Guest.builder().osCustomization(false).operatingSystem(os).build()).build();
+
+      ServerWithExternalIp result = new 
ServerToServerWithExternalIp(dimensionDataCloudControlApi).apply(server);
+      assertNotNull(result);
+      assertEquals(result.server(), server);
+      assertNull(result.externalIp());
+   }

Add a test case to verify what happens when there is network info but no 
matching nat rule is found.

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