StashBuildListener: Add pipeline support

Implement in terms of Job and Run. Use ParameterizedJobMixIn.getTrigger()
to get the trigger.

Remove StashBuildTrigger.getTrigger(), it's not used anymore.

Author: rhencke

src/main/java/stashpullrequestbuilder/stashpullrequestbuilder/StashBuildListener.java

@@ -1,35 +1,38 @@
 package stashpullrequestbuilder.stashpullrequestbuilder;
 
 import hudson.Extension;
-import hudson.model.AbstractBuild;
+import hudson.model.Run;
 import hudson.model.TaskListener;
 import hudson.model.listeners.RunListener;
 import java.lang.invoke.MethodHandles;
 import java.util.logging.Logger;
 import javax.annotation.Nonnull;
+import jenkins.model.ParameterizedJobMixIn;
 
 /** Created by Nathan McCarthy */
 @Extension
-public class StashBuildListener extends RunListener<AbstractBuild> {
+public class StashBuildListener extends RunListener<Run<?, ?>> {
   private static final Logger logger =
       Logger.getLogger(MethodHandles.lookup().lookupClass().getName());
 
   @Override
-  public void onStarted(AbstractBuild abstractBuild, TaskListener listener) {
+  public void onStarted(Run<?, ?> run, TaskListener listener) {
     logger.info("BuildListener onStarted called.");
-    StashBuildTrigger trigger = StashBuildTrigger.getTrigger(abstractBuild.getProject());
+    StashBuildTrigger trigger =
+        ParameterizedJobMixIn.getTrigger(run.getParent(), StashBuildTrigger.class);
     if (trigger == null) {
       return;
     }
-    trigger.getBuilder().getBuilds().onStarted(abstractBuild);
+    trigger.getBuilder().getBuilds().onStarted(run);
   }
 
   @Override
-  public void onCompleted(AbstractBuild abstractBuild, @Nonnull TaskListener listener) {
-    StashBuildTrigger trigger = StashBuildTrigger.getTrigger(abstractBuild.getProject());
+  public void onCompleted(Run<?, ?> run, @Nonnull TaskListener listener) {
+    StashBuildTrigger trigger =
+        ParameterizedJobMixIn.getTrigger(run.getParent(), StashBuildTrigger.class);
     if (trigger == null) {
       return;
     }
-    trigger.getBuilder().getBuilds().onCompleted(abstractBuild, listener);
+    trigger.getBuilder().getBuilds().onCompleted(run, listener);
   }
 }

src/main/java/stashpullrequestbuilder/stashpullrequestbuilder/StashBuildTrigger.java

@@ -207,11 +207,6 @@ public void start(AbstractProject<?, ?> project, boolean newInstance) {
     super.start(project, newInstance);
   }
 
-  public static StashBuildTrigger getTrigger(AbstractProject project) {
-    Trigger trigger = project.getTrigger(StashBuildTrigger.class);
-    return (StashBuildTrigger) trigger;
-  }
-
   public StashPullRequestsBuilder getBuilder() {
     return this.stashPullRequestsBuilder;
   }