Review Request JDK-8171323: generate dot file for java.se and java.se.ee with only API dependences

[Mandy Chung]

A small fix to the GenGraphs tool:

diff --git a/make/src/classes/build/tools/jigsaw/GenGraphs.java b/make/src/classes/build/tools/jigsaw/GenGraphs.java
--- a/make/src/classes/build/tools/jigsaw/GenGraphs.java
+++ b/make/src/classes/build/tools/jigsaw/GenGraphs.java
@@ -214,13 +214,13 @@
 
             // same ranks
             ranks.stream()
-                .forEach(group -> out.format("{rank=same %s}%n",
-                    descriptors.stream()
+                .map(group -> descriptors.stream()
                         .map(ModuleDescriptor::name)
                         .filter(group::contains)
                         .map(mn -> "\"" + mn + "\"")
-                        .collect(joining(","))
-                ));
+                                         .collect(joining(",")))
+                .filter(group -> group.length() > 0)
+                .forEach(group -> out.format("{rank=same %s}%n", group));
 
             descriptors.stream()
                 .filter(jdkGroup::contains)

Mandy

> On Dec 15, 2016, at 10:53 AM, Mandy Chung <mandy.chung at oracle.com> wrote:
> 
> This updates the GenGraphs build tool to generate a dot file for
> `java.se` and `java.se.ee` modules including API dependences only
> that can be used to display Java SE module graph.
> 
> http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8171323/webrev.00/
> 
> Mandy