Added ability to filter merge requests by project and IID (#212).

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

@@ -47,9 +47,22 @@ public class MergeRequestApi extends AbstractApi {
      * @throws GitLabApiException if any exception occurs
      */
     public List<MergeRequest> getMergeRequests(MergeRequestFilter filter, int page, int perPage) throws GitLabApiException {
+
         MultivaluedMap<String, String> queryParams = (filter != null ?
             filter.getQueryParams(page, perPage).asMap() : getPageQueryParams(page, perPage));
-        Response response = get(Response.Status.OK, queryParams, "merge_requests");
+        Response response;
+        if (filter != null && (filter.getProjectId() != null && filter.getProjectId().intValue() > 0) ||
+                (filter.getIids() != null && filter.getIids().size() > 0)) {
+
+            if (filter.getProjectId() == null || filter.getProjectId().intValue() == 0) {
+                throw new RuntimeException("project ID cannot be null or 0");
+            }
+
+            response = get(Response.Status.OK, queryParams, "projects", filter.getProjectId(), "merge_requests");
+        } else {
+            response = get(Response.Status.OK, queryParams, "merge_requests");
+        }
+
         return (response.readEntity(new GenericType<List<MergeRequest>>() {}));
     }
 
@@ -64,8 +77,19 @@ public class MergeRequestApi extends AbstractApi {
      * @throws GitLabApiException if any exception occurs
      */
     public Pager<MergeRequest> getMergeRequests(MergeRequestFilter filter, int itemsPerPage) throws GitLabApiException {
+
         MultivaluedMap<String, String> queryParams = (filter != null ? filter.getQueryParams().asMap() : null);
-        return (new Pager<MergeRequest>(this, MergeRequest.class, itemsPerPage, queryParams, "merge_requests"));
+        if (filter != null && (filter.getProjectId() != null && filter.getProjectId().intValue() > 0) ||
+                (filter.getIids() != null && filter.getIids().size() > 0)) {
+
+            if (filter.getProjectId() == null || filter.getProjectId().intValue() == 0) {
+                throw new RuntimeException("project ID cannot be null or 0");
+            }
+
+            return (new Pager<MergeRequest>(this, MergeRequest.class, itemsPerPage, queryParams, "projects", filter.getProjectId(), "merge_requests"));
+        } else {
+            return (new Pager<MergeRequest>(this, MergeRequest.class, itemsPerPage, queryParams, "merge_requests"));
+        }
     }
 
     /**

src/main/java/org/gitlab4j/api/models/MergeRequestFilter.java

@@ -17,6 +17,8 @@ import com.fasterxml.jackson.annotation.JsonIgnore;
  */
 public class MergeRequestFilter {
 
+    private Integer projectId;
+    private List<Integer> iids;
     private MergeRequestState state;
     private MergeRequestOrderBy orderBy;
     private SortOrder sort;
@@ -35,6 +37,32 @@ public class MergeRequestFilter {
     private String targetBranch;
     private String search;
 
+    public Integer getProjectId() {
+        return projectId;
+    }
+
+    public void setProjectId(Integer projectId) {
+        this.projectId = projectId;
+    }
+
+    public MergeRequestFilter withProjectId(Integer projectId) {
+        this.projectId = projectId;
+        return (this);
+    }
+
+    public List<Integer> getIids() {
+        return iids;
+    }
+
+    public void setIids(List<Integer> iids) {
+        this.iids = iids;
+    }
+
+    public MergeRequestFilter withIids(List<Integer> iids) {
+        this.iids = iids;
+        return (this);
+    }
+
     public MergeRequestState getState() {
         return state;
     }
@@ -266,6 +294,7 @@ public class MergeRequestFilter {
     @JsonIgnore 
     public GitLabApiForm getQueryParams() {
         return (new GitLabApiForm()
+            .withParam("iids", iids)
             .withParam("state", state)
             .withParam("order_by", orderBy)
             .withParam("sort", sort)