Added getClosedByMergeRequests() methods. (#264) (#265)

Author: sb0210

src/main/java/org/gitlab4j/api/IssuesApi.java

@@ -34,6 +34,7 @@
 import org.gitlab4j.api.models.Duration;
 import org.gitlab4j.api.models.Issue;
 import org.gitlab4j.api.models.IssueFilter;
+import org.gitlab4j.api.models.MergeRequest;
 import org.gitlab4j.api.models.TimeStats;
 import org.gitlab4j.api.utils.DurationUtils;
 
@@ -621,4 +622,52 @@ public Optional<TimeStats> getOptionalTimeTrackingStats(Integer projectId, Integ
             return (GitLabApi.createOptionalFromException(glae));
         }
     }
+
+    /**
+     * Get list containing all the merge requests that will close issue when merged.
+     *
+     * GET /projects/:id/issues/:issue_iid/closed_by
+     *
+     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
+     * @param issueIid the internal ID of a project's issue
+     * @return a List containing all the merge requests what will close the issue when merged.
+     * @throws GitLabApiException if any exception occurs
+     */
+    public List<MergeRequest> getClosedByMergeRequests(Object projectIdOrPath, Integer issueIid) throws GitLabApiException {
+        return (getClosedByMergeRequests(projectIdOrPath, issueIid, 1, getDefaultPerPage()));
+    }
+
+    /**
+     * Get list containing all the merge requests that will close issue when merged.
+     *
+     * GET /projects/:id/issues/:issue_iid/closed_by
+     *
+     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
+     * @param issueIid the internal ID of a project's issue
+     * @param page the page to get
+     * @param perPage the number of issues per page
+     * @return a List containing all the merge requests what will close the issue when merged.
+     * @throws GitLabApiException if any exception occurs
+     */
+    public List<MergeRequest> getClosedByMergeRequests(Object projectIdOrPath, Integer issueIid, int page, int perPage) throws GitLabApiException {
+        Response response = get(Response.Status.OK, getPageQueryParams(page, perPage),
+                "projects", getProjectIdOrPath(projectIdOrPath), "issues", issueIid, "closed_by");
+        return (response.readEntity(new GenericType<List<MergeRequest>>() { }));
+    }
+
+    /**
+     * Get a Pager containing all the merge requests that will close issue when merged.
+     *
+     * GET /projects/:id/issues/:issue_iid/closed_by
+     *
+     * @param projectIdOrPath id, path of the project, or a Project instance holding the project ID or path
+     * @param issueIid the internal ID of a project's issue
+     * @param itemsPerPage the number of Issue instances that will be fetched per page
+     * @return a Pager containing all the issues that would be closed by merging the provided merge request
+     * @throws GitLabApiException if any exception occurs
+     */
+    public Pager<MergeRequest> getClosedByMergeRequests(Object projectIdOrPath, Integer issueIid, int itemsPerPage) throws GitLabApiException {
+        return new Pager<MergeRequest>(this, MergeRequest.class, itemsPerPage, null,
+                "projects", getProjectIdOrPath(projectIdOrPath), "issues", issueIid, "closed_by");
+    }
 }