Added more getGroupIssues() methods (#452).

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

@@ -265,6 +265,60 @@ public class IssuesApi extends AbstractApi implements Constants {
         return (getIssues(filter, getDefaultPerPage()).stream());
     }
 
+    /**
+     * Get a list of a group’s issues.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/issues</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @return a List of issues for the specified group
+     * @throws GitLabApiException if any exception occurs
+     */
+    public List<Issue> getGroupIssues(Object groupIdOrPath) throws GitLabApiException {
+	return (getGroupIssues(groupIdOrPath, null, getDefaultPerPage()).all());
+    }
+
+    /**
+     * Get a Pager of groups's issues.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/issues</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @param itemsPerPage the number of Issue instances that will be fetched per page.
+     * @return the Pager of issues for the specified group
+     * @throws GitLabApiException if any exception occurs
+     */
+    public Pager<Issue> getGroupIssues(Object groupIdOrPath, int itemsPerPage) throws GitLabApiException {
+        return (getGroupIssues(groupIdOrPath, null, itemsPerPage));
+    }
+
+    /**
+     * Get a Stream of a group’s issues.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/issues</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @return a Stream of issues for the specified group and filter
+     * @throws GitLabApiException if any exception occurs
+     */
+    public Stream<Issue> getGroupIssuesStream(Object groupIdOrPath) throws GitLabApiException {
+	return (getGroupIssues(groupIdOrPath, null, getDefaultPerPage()).stream());
+    }
+
+    /**
+     * Get a list of a group’s issues.
+     *
+     * <pre><code>GitLab Endpoint: GET /groups/:id/issues</code></pre>
+     *
+     * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
+     * @param filter {@link IssueFilter} a IssueFilter instance with the filter settings.
+     * @return a List of issues for the specified group and filter
+     * @throws GitLabApiException if any exception occurs
+     */
+    public List<Issue> getGroupIssues(Object groupIdOrPath, IssueFilter filter) throws GitLabApiException {
+	return (getGroupIssues(groupIdOrPath, filter, getDefaultPerPage()).all());
+    }
+
     /**
      * Get a list of groups's issues.
      *
@@ -272,33 +326,30 @@ public class IssuesApi extends AbstractApi implements Constants {
      *
      * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
      * @param filter {@link IssueFilter} a IssueFilter instance with the filter settings.
-     * @param itemsPerPage the number of Project instances that will be fetched per page.
-     * @return the Pager of issues in the specified range.
+     * @param itemsPerPage the number of Issue instances that will be fetched per page.
+     * @return the Pager of issues for the specified group and filter
      * @throws GitLabApiException if any exception occurs
      */
     public Pager<Issue> getGroupIssues(Object groupIdOrPath, IssueFilter filter, int itemsPerPage) throws GitLabApiException {
-        GitLabApiForm formData = filter.getQueryParams();
-        return (new Pager<Issue>(this, Issue.class, itemsPerPage, formData.asMap(), "groups", getGroupIdOrPath(groupIdOrPath), "issues"));
+        GitLabApiForm formData = (filter != null ? filter.getQueryParams() : new GitLabApiForm());
+        return (new Pager<Issue>(this, Issue.class, itemsPerPage, formData.asMap(),
+                "groups", getGroupIdOrPath(groupIdOrPath), "issues"));
     }
-    
+
     /**
-     * Get a list of project's issues.
+     * Get a Stream of a group’s issues.
      *
-     * <pre><code>GitLab Endpoint: GET /projects/:id/issues</code></pre>
+     * <pre><code>GitLab Endpoint: GET /groups/:id/issues</code></pre>
      *
      * @param groupIdOrPath the group in the form of an Integer(ID), String(path), or Group instance
      * @param filter {@link IssueFilter} a IssueFilter instance with the filter settings.
-     * @param page the page to get.
-     * @param perPage the number of projects per page.
-     * @return the list of issues in the specified range.
+     * @return a Stream of issues for the specified group and filter
      * @throws GitLabApiException if any exception occurs
      */
-    public List<Issue> getGroupIssues(Object groupIdOrPath, IssueFilter filter, int page, int perPage) throws GitLabApiException {
-        GitLabApiForm formData = filter.getQueryParams(page, perPage);
-        Response response = get(Response.Status.OK, formData.asMap(), "groups", getGroupIdOrPath(groupIdOrPath), "issues");
-        return (response.readEntity(new GenericType<List<Issue>>() {}));
+    public Stream<Issue> getGroupIssuesStream(Object groupIdOrPath, IssueFilter filter) throws GitLabApiException {
+	return (getGroupIssues(groupIdOrPath, filter, getDefaultPerPage()).stream());
     }
-    
+
     /**
      * Get a single project issue.
      *

src/test/java/org/gitlab4j/api/TestIssuesApi.java

@@ -32,12 +32,14 @@ import static org.junit.Assume.assumeNotNull;
 import java.util.Arrays;
 import java.util.Date;
 import java.util.List;
+import java.util.Optional;
 import java.util.Random;
 
 import javax.ws.rs.core.Response;
 
 import org.gitlab4j.api.Constants.IssueState;
 import org.gitlab4j.api.models.Duration;
+import org.gitlab4j.api.models.Group;
 import org.gitlab4j.api.models.Issue;
 import org.gitlab4j.api.models.IssueFilter;
 import org.gitlab4j.api.models.Project;
@@ -63,9 +65,11 @@ public class TestIssuesApi extends AbstractIntegrationTest  {
 
     private static GitLabApi gitLabApi;
     private static Project testProject;
+    private static Group testGroup;
 
     private static final String ISSUE_TITLE = "Test Issue Title";
     private static final String ISSUE_DESCRIPTION = "This is a really nice description, not.";
+    private static final String TEST_GROUP = HelperUtils.getProperty(GROUP_KEY);
     private static Random randomNumberGenerator = new Random();
 
     public TestIssuesApi() {
@@ -79,6 +83,11 @@ public class TestIssuesApi extends AbstractIntegrationTest  {
         gitLabApi = baseTestSetup();
         testProject = getTestProject();
 
+        if (gitLabApi != null) {
+            Optional<Group> group = gitLabApi.getGroupApi().getOptionalGroup(TEST_GROUP);
+            testGroup = group.get();
+        }
+
         deleteAllTestIssues();
     }
 
@@ -146,6 +155,13 @@ public class TestIssuesApi extends AbstractIntegrationTest  {
         assertTrue(found);
     }
 
+    @Test
+    public void testGetGroupIssues() throws GitLabApiException {
+        assumeNotNull(testGroup);
+        List<Issue> issues = gitLabApi.getIssuesApi().getGroupIssues(testGroup);
+        assertNotNull(issues);
+    }
+
     @Test
     public void testCreateIssue() throws GitLabApiException {