Improvement of getMergedRequest methods and new cherryPick method (#209)

* New methods to retrieve Merge Requests with a given status

* improvement of the API to retrieve the Merge Requests

* new method to cherry-pick a commit

* new cherryPick method with a GitlabProject and javadoc

* fixed cherryPick method url and method

* moves MergeRequest status constants

src/main/java/org/gitlab/api/GitlabAPI.java

@@ -937,34 +937,119 @@ public class GitlabAPI {
     }
 
     public List<GitlabMergeRequest> getOpenMergeRequests(Serializable projectId) throws IOException {
-        Query query = new Pagination().withPerPage(Pagination.MAX_ITEMS_PER_PAGE).asQuery();
-        query.append("state", "opened");
-        String tailUrl = GitlabProject.URL + "/" + sanitizeProjectId(projectId) + GitlabMergeRequest.URL + query;
-        return retrieve().getAll(tailUrl, GitlabMergeRequest[].class);
+        return getMergeRequestsWithStatus(projectId, GitlabMergeRequest.STATUS_OPENED);
+    }
+    
+    public List<GitlabMergeRequest> getOpenMergeRequests(Serializable projectId, Pagination pagination) throws IOException {
+        return getMergeRequestsWithStatus(projectId, GitlabMergeRequest.STATUS_OPENED, pagination);
     }
 
     public List<GitlabMergeRequest> getOpenMergeRequests(GitlabProject project) throws IOException {
-        Query query = new Pagination().withPerPage(Pagination.MAX_ITEMS_PER_PAGE).asQuery();
-        query.append("state", "opened");
+        return getMergeRequestsWithStatus(project, GitlabMergeRequest.STATUS_OPENED);
+    }
+    
+    public List<GitlabMergeRequest> getOpenMergeRequests(GitlabProject project, Pagination pagination) throws IOException {
+        return getMergeRequestsWithStatus(project, GitlabMergeRequest.STATUS_OPENED, pagination);
+    }
+    
+    public List<GitlabMergeRequest> getMergedMergeRequests(Serializable projectId) throws IOException {
+        return getMergeRequestsWithStatus(projectId, GitlabMergeRequest.STATUS_MERGED);
+    }
+    
+    public List<GitlabMergeRequest> getMergedMergeRequests(Serializable projectId, Pagination pagination) throws IOException {
+        return getMergeRequestsWithStatus(projectId, GitlabMergeRequest.STATUS_MERGED, pagination);
+    }
+
+    public List<GitlabMergeRequest> getMergedMergeRequests(GitlabProject project) throws IOException {
+        return getMergeRequestsWithStatus(project, GitlabMergeRequest.STATUS_MERGED);
+    }
+    
+    public List<GitlabMergeRequest> getMergedMergeRequests(GitlabProject project, Pagination pagination) throws IOException {
+        return getMergeRequestsWithStatus(project, GitlabMergeRequest.STATUS_MERGED, pagination);
+    }
+    
+    public List<GitlabMergeRequest> getClosedMergeRequests(Serializable projectId) throws IOException {
+        return getMergeRequestsWithStatus(projectId, GitlabMergeRequest.STATUS_CLOSED);
+    }
+    
+    public List<GitlabMergeRequest> getClosedMergeRequests(Serializable projectId, Pagination pagination) throws IOException {
+        return getMergeRequestsWithStatus(projectId, GitlabMergeRequest.STATUS_CLOSED, pagination);
+    }
+
+    public List<GitlabMergeRequest> getClosedMergeRequests(GitlabProject project) throws IOException {
+        return getMergeRequestsWithStatus(project, GitlabMergeRequest.STATUS_CLOSED);
+    }
+    
+    public List<GitlabMergeRequest> getClosedMergeRequests(GitlabProject project, Pagination pagination) throws IOException {
+        return getMergeRequestsWithStatus(project, GitlabMergeRequest.STATUS_CLOSED, pagination);
+    }
+
+    public List<GitlabMergeRequest> getMergeRequestsWithStatus(Serializable projectId, String status) throws IOException {
+        return getMergeRequestsWithStatus(projectId, status, new Pagination().withPerPage(Pagination.MAX_ITEMS_PER_PAGE));
+    }
+    
+    public List<GitlabMergeRequest> getMergeRequestsWithStatus(Serializable projectId, String state, Pagination pagination) throws IOException {
+        Query query = pagination.asQuery();
+        query.append("state", state);
+        String tailUrl = GitlabProject.URL + "/" + sanitizeProjectId(projectId) + GitlabMergeRequest.URL + query;
+        return retrieve().getAll(tailUrl, GitlabMergeRequest[].class);
+    }
+    
+    public List<GitlabMergeRequest> getMergeRequestsWithStatus(GitlabProject project, String status) throws IOException {
+        return getMergeRequestsWithStatus(project, status, new Pagination().withPerPage(Pagination.MAX_ITEMS_PER_PAGE));
+    }
+    
+    public List<GitlabMergeRequest> getMergeRequestsWithStatus(GitlabProject project, String state, Pagination pagination) throws IOException {
+        Query query = pagination.asQuery();
+        query.append("state", state);
         String tailUrl = GitlabProject.URL + "/" + project.getId() + GitlabMergeRequest.URL + query;
         return retrieve().getAll(tailUrl, GitlabMergeRequest[].class);
     }
-
+    
     public List<GitlabMergeRequest> getMergeRequests(Serializable projectId) throws IOException {
         String tailUrl = GitlabProject.URL + "/" + sanitizeProjectId(projectId) + GitlabMergeRequest.URL + PARAM_MAX_ITEMS_PER_PAGE;
         return retrieve().getAll(tailUrl, GitlabMergeRequest[].class);
     }
+    
+    public List<GitlabMergeRequest> getMergeRequests(Serializable projectId, Pagination pagination) throws IOException {
+        String tailUrl = GitlabProject.URL + "/" + sanitizeProjectId(projectId) + GitlabMergeRequest.URL + pagination.toString();
+        return retrieve().getAll(tailUrl, GitlabMergeRequest[].class);
+    }
 
     public List<GitlabMergeRequest> getMergeRequests(GitlabProject project) throws IOException {
         String tailUrl = GitlabProject.URL + "/" + project.getId() + GitlabMergeRequest.URL + PARAM_MAX_ITEMS_PER_PAGE;
         return retrieve().getAll(tailUrl, GitlabMergeRequest[].class);
     }
+    
+    public List<GitlabMergeRequest> getMergeRequests(GitlabProject project, Pagination pagination) throws IOException {
+        String tailUrl = GitlabProject.URL + "/" + project.getId() + GitlabMergeRequest.URL + pagination.toString();
+        return retrieve().getAll(tailUrl, GitlabMergeRequest[].class);
+    }
 
     public List<GitlabMergeRequest> getAllMergeRequests(GitlabProject project) throws IOException {
-        String tailUrl = GitlabProject.URL + "/" + project.getId() + GitlabMergeRequest.URL + PARAM_MAX_ITEMS_PER_PAGE;
+        String tailUrl = GitlabProject.URL + "/" + project.getId() + GitlabMergeRequest.URL;
         return retrieve().getAll(tailUrl, GitlabMergeRequest[].class);
     }
 
+    /**
+     * Cherry picks a commit.
+     * 
+     * @param projectId         The id of the project
+     * @param sha               The sha of the commit
+     * @param targetBranchName  The branch on which the commit must be cherry-picked
+     * @return the commit of the cherry-pick.
+     * @throws IOException on gitlab api call error
+     */
+    public GitlabCommit cherryPick(Serializable projectId, String sha, String targetBranchName) throws IOException {
+        String tailUrl = GitlabProject.URL + "/" + sanitizeProjectId(projectId) + "/repository/commits/" + sha + "/cherry_pick";
+        return retrieve().with("branch", targetBranchName).to(tailUrl, GitlabCommit.class);
+    }
+    
+    public GitlabCommit cherryPick(GitlabProject project, String sha, String targetBranchName) throws IOException {
+        String tailUrl = GitlabProject.URL + "/" + project.getId() + "/repository/commits/" + sha + "/cherry_pick";
+        return dispatch().with("branch", targetBranchName).to(tailUrl, GitlabCommit.class);
+    }
+    
     /**
      * Return Merge Request.
      *

src/main/java/org/gitlab/api/models/GitlabMergeRequest.java

@@ -7,7 +7,10 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 
 public class GitlabMergeRequest {
     public static final String URL = "/merge_requests";
-
+    public static final String STATUS_OPENED = "opened";
+    public static final String STATUS_MERGED = "merged";
+    public static final String STATUS_CLOSED = "closed";
+    
     private Integer id;
     private Integer iid;
     private String title;