Add support for link type between issues

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

@@ -16,6 +16,7 @@
 import org.gitlab4j.api.models.IssueLink;
 import org.gitlab4j.api.models.IssuesStatistics;
 import org.gitlab4j.api.models.IssuesStatisticsFilter;
+import org.gitlab4j.api.models.LinkType;
 import org.gitlab4j.api.models.MergeRequest;
 import org.gitlab4j.api.models.Participant;
 import org.gitlab4j.api.models.TimeStats;
@@ -889,10 +890,31 @@ public Stream<Issue> getIssueLinksStream(Object projectIdOrPath, Long issueIid)
      */
     public IssueLink createIssueLink(Object projectIdOrPath, Long issueIid,
             Object targetProjectIdOrPath, Long targetIssueIid) throws GitLabApiException {
+        return createIssueLink(projectIdOrPath, issueIid, targetProjectIdOrPath, targetIssueIid, null);
+    }
+
+    /**
+     * Creates a two-way relation between two issues. User must be allowed to update both issues in order to succeed.
+     *
+     * <p>NOTE: Only available in GitLab Starter, GitLab Bronze, and higher tiers.</p>
+     *
+     * <pre><code>GitLab Endpoint: POST /projects/:id/issues/:issue_iid/links</code></pre>
+     *
+     * @param projectIdOrPath the project in the form of an Long(ID), String(path), or Project instance
+     * @param issueIid the internal ID of a project's issue
+     * @param targetProjectIdOrPath the project in the form of an Long(ID), String(path), or Project instance of the target project
+     * @param targetIssueIid the internal ID of a target project’s issue
+     * @param linkType the type of the relation (optional), defaults to {@link LinkType#RELATES_TO}.
+     * @return an instance of IssueLink holding the link relationship
+     * @throws GitLabApiException if any exception occurs
+     */
+    public IssueLink createIssueLink(Object projectIdOrPath, Long issueIid,
+            Object targetProjectIdOrPath, Long targetIssueIid, LinkType linkType) throws GitLabApiException {
 
         GitLabApiForm formData = new GitLabApiForm()
                 .withParam("target_project_id", getProjectIdOrPath(targetProjectIdOrPath), true)
-                .withParam("target_issue_iid", targetIssueIid, true);
+                .withParam("target_issue_iid", targetIssueIid, true)
+                .withParam("link_type", linkType, false);
 
         Response response = post(Response.Status.OK, formData.asMap(),
                 "projects", getProjectIdOrPath(projectIdOrPath), "issues", issueIid, "links");

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

@@ -0,0 +1,340 @@
+
+package org.gitlab4j.api.models;
+
+import java.util.Date;
+import java.util.List;
+
+import org.gitlab4j.api.Constants.IssueState;
+import org.gitlab4j.api.utils.JacksonJson;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.node.IntNode;
+import com.fasterxml.jackson.databind.node.LongNode;
+import com.fasterxml.jackson.databind.node.TextNode;
+import com.fasterxml.jackson.databind.node.ValueNode;
+
+public abstract class AbstractIssue {
+
+    public static class TaskCompletionStatus {
+
+        private Integer count;
+        private Integer completedCount;
+
+        public Integer getCount() {
+            return count;
+        }
+
+        public void setCount(Integer count) {
+            this.count = count;
+        }
+
+        public Integer getCompletedCount() {
+            return completedCount;
+        }
+
+        public void setCompletedCount(Integer completedCount) {
+            this.completedCount = completedCount;
+        }
+
+        @Override
+        public String toString() {
+            return (JacksonJson.toJsonString(this));
+        }
+    }
+
+    private Assignee assignee;
+    private List<Assignee> assignees;
+    private Author author;
+    private Boolean confidential;
+    private Date createdAt;
+    private Date updatedAt;
+    private Date closedAt;
+    private User closedBy;
+    private String description;
+    private Date dueDate;
+
+    @JsonProperty("id")
+    private ValueNode actualId;
+    @JsonIgnore
+    private String externalId;
+    @JsonIgnore
+    private Long id;
+
+    private Long iid;
+    private List<String> labels;
+    private Milestone milestone;
+    private Long projectId;
+    private IssueState state;
+    private String title;
+    private Integer userNotesCount;
+    private String webUrl;
+    private Integer weight;
+    private Boolean discussionLocked;
+    private TimeStats timeStats;
+
+    private Integer upvotes;
+    private Integer downvotes;
+    private Integer mergeRequestsCount;
+    private Boolean hasTasks;
+    private String taskStatus;
+    private TaskCompletionStatus taskCompletionStatus;
+
+    public Assignee getAssignee() {
+        return assignee;
+    }
+
+    public void setAssignee(Assignee assignee) {
+        this.assignee = assignee;
+    }
+
+    public List<Assignee> getAssignees() {
+        return assignees;
+    }
+
+    public void setAssignees(List<Assignee> assignees) {
+        this.assignees = assignees;
+    }
+
+    public Author getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(Author author) {
+        this.author = author;
+    }
+
+    public Boolean getConfidential() {
+        return confidential;
+    }
+
+    public void setConfidential(Boolean confidential) {
+        this.confidential = confidential;
+    }
+
+    public Date getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(Date createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public Date getDueDate() {
+        return dueDate;
+    }
+
+    public void setDueDate(Date dueDate) {
+	this.dueDate = dueDate;
+    }
+
+    public ValueNode getActualId() {
+        return actualId;
+    }
+
+    public void setActualId(ValueNode id) {
+	actualId = id;
+        if (actualId instanceof TextNode) {
+            externalId = actualId.asText();
+        } else if (actualId instanceof IntNode || actualId instanceof LongNode) {
+            this.id = actualId.asLong();
+        }
+    }
+
+    public Long getId() {
+        return (id);
+    }
+
+    public void setId(Long id) {
+	this.id = id;
+	if (id != null) {
+	    actualId = new LongNode(id);
+	    externalId = null;
+	}
+    }
+
+    public String getExternalId() {
+        return (externalId);
+    }
+
+    public void setExternalId(String externalId) {
+        this.externalId = externalId;
+	if (externalId != null) {
+	    actualId = new TextNode(externalId);
+	    id = null;
+	}
+    }
+
+    public Long getIid() {
+        return iid;
+    }
+
+    public void setIid(Long iid) {
+        this.iid = iid;
+    }
+
+    public List<String> getLabels() {
+        return labels;
+    }
+
+    public void setLabels(List<String> labels) {
+        this.labels = labels;
+    }
+
+    public Milestone getMilestone() {
+        return milestone;
+    }
+
+    public void setMilestone(Milestone milestone) {
+        this.milestone = milestone;
+    }
+
+    public Long getProjectId() {
+        return projectId;
+    }
+
+    public void setProjectId(Long projectId) {
+        this.projectId = projectId;
+    }
+
+    public IssueState getState() {
+        return state;
+    }
+
+    public void setState(IssueState state) {
+        this.state = state;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public Date getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(Date updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    public Date getClosedAt() {
+        return closedAt;
+    }
+
+    public void setClosedAt(Date closedAt) {
+        this.closedAt = closedAt;
+    }
+
+    public User getClosedBy() {
+        return closedBy;
+    }
+
+    public void setClosedBy(User closedBy) {
+        this.closedBy = closedBy;
+    }
+
+    public Integer getUserNotesCount() {
+        return userNotesCount;
+    }
+
+    public void setUserNotesCount(Integer userNotesCount) {
+        this.userNotesCount = userNotesCount;
+    }
+
+    public String getWebUrl() {
+        return webUrl;
+    }
+
+    public void setWebUrl(String webUrl) {
+        this.webUrl = webUrl;
+    }
+
+    public Integer getWeight() {
+        return weight;
+    }
+
+    public void setWeight(Integer weight) {
+        this.weight = weight;
+    }
+
+    public Boolean getDiscussionLocked() {
+        return discussionLocked;
+    }
+
+    public void setDiscussionLocked(Boolean discussionLocked) {
+        this.discussionLocked = discussionLocked;
+    }
+
+    public TimeStats getTimeStats() {
+        return timeStats;
+    }
+
+    public void setTimeStats(TimeStats timeStats) {
+        this.timeStats = timeStats;
+    }
+
+    public Integer getUpvotes() {
+        return upvotes;
+    }
+
+    public void setUpvotes(Integer upvotes) {
+        this.upvotes = upvotes;
+    }
+
+    public Integer getDownvotes() {
+        return downvotes;
+    }
+
+    public void setDownvotes(Integer downvotes) {
+        this.downvotes = downvotes;
+    }
+
+    public Integer getMergeRequestsCount() {
+        return mergeRequestsCount;
+    }
+
+    public void setMergeRequestsCount(Integer mergeRequestsCount) {
+        this.mergeRequestsCount = mergeRequestsCount;
+    }
+
+    public Boolean getHasTasks() {
+        return hasTasks;
+    }
+
+    public void setHasTasks(Boolean hasTasks) {
+        this.hasTasks = hasTasks;
+    }
+
+    public String getTaskStatus() {
+        return taskStatus;
+    }
+
+    public void setTaskStatus(String taskStatus) {
+        this.taskStatus = taskStatus;
+    }
+
+    public TaskCompletionStatus getTaskCompletionStatus() {
+        return taskCompletionStatus;
+    }
+
+    public void setTaskCompletionStatus(TaskCompletionStatus taskCompletionStatus) {
+        this.taskCompletionStatus = taskCompletionStatus;
+    }
+
+    @Override
+    public String toString() {
+        return (JacksonJson.toJsonString(this));
+    }
+}