Implement getIssueNumber and getPullNumber

src/main/java/org/kohsuke/github/GHThread.java

@@ -149,6 +149,32 @@ public GHPullRequest getBoundPullRequest() throws IOException {
         return repository.getPullRequest(Integer.parseInt(subject.url.substring(subject.url.lastIndexOf('/') + 1)));
     }
 
+    /**
+     * If this thread is about an issue, return the issue number.
+     *
+     * @return -1 if this thread is not about an issue.
+     * @throws IOException
+     *             the io exception
+     */
+    public int getIssueNumber() throws IOException {
+        final GHIssue ghIssue = getBoundIssue();
+
+        return ghIssue == null ? -1 : ghIssue.getNumber();
+    }
+
+    /**
+     * If this thread is about a pull request, return the pull request number.
+     *
+     * @return -1 if this thread is not about a pull request.
+     * @throws IOException
+     *             the io exception
+     */
+    public int getPullNumber() throws IOException {
+        final GHPullRequest ghPullRequest = getBoundPullRequest();
+
+        return ghPullRequest == null ? -1 : ghPullRequest.getNumber();
+    }
+
     /**
      * If this thread is about a commit, return that commit.
      *

src/test/java/org/kohsuke/github/AppTest.java

@@ -1671,6 +1671,19 @@ public void notifications() throws Exception {
             assertThat(t.getUpdatedAt(), notNullValue());
             assertThat(t.getType(), oneOf("Issue", "PullRequest"));
 
+            // Test issue number and pull number of each GHThread.
+            if (t.getBoundIssue() == null) {
+                assertThat(t.getIssueNumber(), is(-1));
+            } else {
+                assertThat(t.getIssueNumber(), not(-1));
+            }
+
+            if (t.getBoundPullRequest() == null) {
+                assertThat(t.getPullNumber(), is(-1));
+            } else {
+                assertThat(t.getPullNumber(), not(-1));
+            }
+
             // both thread an unread are included
             // assertThat(t.getLastReadAt(), notNullValue());
             // assertThat(t.isRead(), equalTo(true));