Add Epic and Epic Issues API support

README.md

@@ -11,7 +11,7 @@ To utilize the GitLab API for Java in your project, simply add the following dep
 ```java
 dependencies {
     ...
-    compile group: 'org.gitlab4j', name: 'gitlab4j-api', version: '4.8.29'
+    compile group: 'org.gitlab4j', name: 'gitlab4j-api', version: '4.8.30'
 }
 ```
 
@@ -20,7 +20,7 @@ dependencies {
 <dependency>
     <groupId>org.gitlab4j</groupId>
     <artifactId>gitlab4j-api</artifactId>
-    <version>4.8.29</version>
+    <version>4.8.30</version>
 </dependency>
 ```
 
@@ -137,6 +137,7 @@ The API has been broken up into sub APIs classes to make it easier to learn and
 ------------------
 &nbsp;&nbsp;[CommitsApi](#commitsapi)<br/>
 &nbsp;&nbsp;[DeployKeysApi](#deploykeysapi)<br/>
+&nbsp;&nbsp;[EpicsApi](#epicsapi)<br/>
 &nbsp;&nbsp;[EventsApi](#eventsapi)<br/>
 &nbsp;&nbsp;[GroupApi](#groupapi)<br/>
 &nbsp;&nbsp;[HealthCheckApi](#healthcheckapi)<br/>
@@ -179,10 +180,16 @@ List<Commit> commits = gitLabApi.getCommitsApi().getCommits(1234, "new-feature",
 List<DeployKey> deployKeys = gitLabApi.getDeployKeysApi().getDeployKeys();
 ```
 
+#### EpicsApi
+```java
+// Get a list epics of the requested group and its subgroups.
+List<Epic> epics = gitLabApi.getEpicsApi().getEpics(1);
+```
+
 #### EventsApi
 ```java
 // Get a list of Events for the authenticated user
-Date after = new Date(0); // After Eposc
+Date after = new Date(0); // After Epoch
 Date before = new Date(); // Before now
 List<Event> events = gitLabApi.getEventsApi().getAuthenticatedUserEvents(null, null, before, after, DESC);
 ```

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

@@ -59,6 +59,30 @@ public String toString() {
         }
     }
 
+
+    /** Enum to use for ordering the results of getEpics(). */
+    public enum EpicOrderBy {
+
+        CREATED_AT, UPDATED_AT;
+
+        private static JacksonJsonEnumHelper<EpicOrderBy> enumHelper = new JacksonJsonEnumHelper<>(EpicOrderBy.class);
+
+        @JsonCreator
+        public static EpicOrderBy forValue(String value) {
+            return enumHelper.forValue(value);
+        }
+
+        @JsonValue
+        public String toValue() {
+            return (enumHelper.toString(this));
+        }
+
+        @Override
+        public String toString() {
+            return (enumHelper.toString(this));
+        }
+    }
+
     /** Enum to use for ordering the results of getProjects(). */
     public enum ProjectOrderBy {
 

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

@@ -50,6 +50,7 @@ public String getApiNamespace() {
 
     private CommitsApi commitsApi;
     private DeployKeysApi deployKeysApi;
+    private EpicsApi epicsApi;
     private EventsApi eventsApi;
     private GroupApi groupApi;
     private HealthCheckApi healthCheckApi;
@@ -846,6 +847,25 @@ public DeployKeysApi getDeployKeysApi() {
         return (deployKeysApi);
     }
 
+    /**
+     * Gets the EpicsApi instance owned by this GitLabApi instance. The EpicsApi is used
+     * to perform all Epics and Epic Issues related API calls.
+     *
+     * @return the EpicsApi instance owned by this GitLabApi instance
+     */
+    public EpicsApi getEpicsApi() {
+
+        if (epicsApi == null) {
+            synchronized (this) {
+                if (epicsApi == null) {
+                    epicsApi = new EpicsApi(this);
+                }
+            }
+        }
+
+        return (epicsApi);
+    }
+
     /**
      * Gets the EventsApi instance owned by this GitLabApi instance. The EventsApi is used
      * to perform all events related API calls.

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

@@ -21,6 +21,18 @@ public GitLabApiForm(MultivaluedHashMap<String, String> map) {
         super(map);
     }
 
+    /**
+     * Create a GitLabApiForm instance with the "page", and "per_page" parameters preset.
+     *
+     * @param page the value for the "page" parameter
+     * @param perPage the value for the "per_page" parameter
+     */
+    public GitLabApiForm(int page, int perPage) {
+        super();
+        withParam(AbstractApi.PAGE_PARAM,  page);
+        withParam(AbstractApi.PER_PAGE_PARAM, (Integer)perPage);
+    }
+
     /**
      * Fluent method for adding query and form parameters to a get() or post() call.
      * 

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

@@ -0,0 +1,143 @@
+package org.gitlab4j.api.models;
+
+import java.util.Date;
+import java.util.List;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlRootElement;
+
+@XmlRootElement
+@XmlAccessorType(XmlAccessType.FIELD)
+public class Epic {
+
+    private Integer id;
+    private Integer iid;
+    private Integer groupId;
+    private String title;
+    private String description;
+    private Author author;
+    private List<String> labels;
+    private Date startDate;
+    private Date endDate;
+    private Date createdAt;
+    private Date updatedAt;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getIid() {
+        return iid;
+    }
+
+    public void setIid(Integer iid) {
+        this.iid = iid;
+    }
+
+    public Integer getGroupId() {
+        return groupId;
+    }
+
+    public void setGroupId(Integer groupId) {
+        this.groupId = groupId;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public Epic withTitle(String title) {
+        this.title = title;
+        return (this);
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public Epic withDescription(String description) {
+        this.description = description;
+        return (this);
+    }
+
+    public Author getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(Author author) {
+        this.author = author;
+    }
+
+    public Epic withAuthor(Author author) {
+        this.author = author;
+        return (this);
+    }
+
+    public List<String> getLabels() {
+        return labels;
+    }
+
+    public void setLabels(List<String> labels) {
+        this.labels = labels;
+    }
+
+    public Epic withLabels(List<String> labels) {
+        this.labels = labels;
+        return (this);
+    }
+
+    public Date getStartDate() {
+        return startDate;
+    }
+
+    public void setStartDate(Date startDate) {
+        this.startDate = startDate;
+    }
+
+    public Epic withStartDate(Date startDate) {
+        this.startDate = startDate;
+        return (this);
+    }
+
+    public Date getEndDate() {
+        return endDate;
+    }
+
+    public void setEndDate(Date endDate) {
+        this.endDate = endDate;
+    }
+
+    public Epic withEndDate(Date endDate) {
+        this.endDate = endDate;
+        return (this);
+    }
+
+    public Date getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(Date createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public Date getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(Date updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+}

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

@@ -0,0 +1,81 @@
+
+package org.gitlab4j.api.models;
+
+import java.util.Map;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class EpicIssue extends Issue {
+
+    private Integer downvotes;
+    private Integer upvotes;
+
+    @JsonProperty("_links")
+    private Map<String, String> links;
+
+    private Boolean subscribed;
+    private Integer epicIssueId;
+    private Integer relativePosition;
+
+    public Integer getDownvotes() {
+        return downvotes;
+    }
+
+    public void setDownvotes(Integer downvotes) {
+        this.downvotes = downvotes;
+    }
+
+    public Integer getUpvotes() {
+        return upvotes;
+    }
+
+    public void setUpvotes(Integer upvotes) {
+        this.upvotes = upvotes;
+    }
+
+    public Map<String, String> getLinks() {
+        return links;
+    }
+
+    public void setLinks(Map<String, String> links) {
+        this.links = links;
+    }
+
+    @JsonIgnore
+    public String getLinkByName(String name) {
+        if (links == null || links.isEmpty()) {
+            return (null);
+        }
+
+        return (links.get(name));
+    }
+
+    public Boolean getSubscribed() {
+        return subscribed;
+    }
+
+    public void setSubscribed(Boolean subscribed) {
+        this.subscribed = subscribed;
+    }
+
+    public Integer getEpicIssueId() {
+        return epicIssueId;
+    }
+
+    public void setEpicIssueId(Integer epicIssueId) {
+        this.epicIssueId = epicIssueId;
+    }
+
+    public Integer getRelativePosition() {
+        return relativePosition;
+    }
+
+    public void setRelativePosition(Integer relativePosition) {
+        this.relativePosition = relativePosition;
+    }
+}