Mods to support EventsApi (#60).

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

@@ -45,12 +45,12 @@ public interface Constants {
 
         @JsonValue
         public String toValue() {
-            return (name().toLowerCase());
+            return (enumHelper.toString(this));
         }
 
         @Override
         public String toString() {
-            return (name().toLowerCase());
+            return (enumHelper.toString(this));
         }
     }
 
@@ -67,12 +67,12 @@ public interface Constants {
 
         @JsonValue
         public String toValue() {
-            return (name().toLowerCase());
+            return (enumHelper.toString(this));
         }
 
         @Override
         public String toString() {
-            return (name().toLowerCase());
+            return (enumHelper.toString(this));
         }
     }
 
@@ -90,12 +90,12 @@ public interface Constants {
 
         @JsonValue
         public String toValue() {
-            return (name().toLowerCase());
+            return (enumHelper.toString(this));
         }
 
         @Override
         public String toString() {
-            return (name().toLowerCase());
+            return (enumHelper.toString(this));
         }
     }
 
@@ -113,12 +113,12 @@ public interface Constants {
 
         @JsonValue
         public String toValue() {
-            return (name().toLowerCase());
+            return (enumHelper.toString(this));
         }
 
         @Override
         public String toString() {
-            return (name().toLowerCase());
+            return (enumHelper.toString(this));
         }
     }
 
@@ -133,10 +133,14 @@ public interface Constants {
         public static JobScope forValue(String value) { return enumHelper.forValue(value); }
 
         @JsonValue
-        public String toValue() { return (name().toLowerCase()); }
+        public String toValue() {
+            return (enumHelper.toString(this));
+        }
 
         @Override
-        public String toString() { return (name().toLowerCase()); }
+        public String toString() {
+            return (enumHelper.toString(this));
+        }
     }
 
     /** Enum to use for specifying the state of a merge request update. */
@@ -149,10 +153,61 @@ public interface Constants {
         @JsonCreator
         public static StateEvent forValue(String value) { return enumHelper.forValue(value); }
 
+
         @JsonValue
-        public String toValue() { return (name().toLowerCase()); }
+        public String toValue() {
+            return (enumHelper.toString(this));
+        }
 
         @Override
-        public String toString() { return (name().toLowerCase()); }
+        public String toString() {
+            return (enumHelper.toString(this));
+        }
+    }
+
+    /** Enum to use for specifying the event action_type. */
+    public enum ActionType {
+
+        CREATED, UPDATED, CLOSED, REOPENED, PUSHED, COMMENTED, MERGED, JOINED, LEFT, DESTROYED, EXPIRED;
+
+        private static JacksonJsonEnumHelper<ActionType> enumHelper = new JacksonJsonEnumHelper<>(ActionType.class);
+
+        @JsonCreator
+        public static ActionType 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 specifying the event target_type. */
+    public enum TargetType {
+
+        ISSUE, MILESTONE, MERGE_REQUEST, NOTE, PROJECT, SNIPPET, USER;
+
+        private static JacksonJsonEnumHelper<TargetType> enumHelper = new JacksonJsonEnumHelper<>(TargetType.class, true);
+
+        @JsonCreator
+        public static TargetType forValue(String value) {
+            return enumHelper.forValue(value);
+        }
+
+        @JsonValue
+        public String toValue() {
+            return (enumHelper.toString(this));
+        }
+
+        @Override
+        public String toString() {
+            return (enumHelper.toString(this));
+        }
     }
 }

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

@@ -41,6 +41,7 @@ public class GitLabApi {
     private UserApi userApi;
     private JobApi jobApi;
     private NotesApi notesApi;
+    private EventsApi eventsApi;
 
     private Session session;
 
@@ -192,6 +193,7 @@ public class GitLabApi {
         repositoryFileApi = new RepositoryFileApi(this);
         jobApi = new JobApi(this);
         notesApi = new NotesApi(this);
+        eventsApi = new EventsApi(this);
     }
 
     /**
@@ -401,7 +403,9 @@ public class GitLabApi {
      *
      * @return the JobsApi instance owned by this GitLabApi instance
      */
-    public JobApi getJobApi() { return (jobApi); }
+    public JobApi getJobApi() {
+        return (jobApi);
+    }
 
     /**
      * Gets the NotesApi instance owned by this GitLabApi instance. The NotesApi is used
@@ -413,4 +417,13 @@ public class GitLabApi {
         return (notesApi);
     }
 
+    /**
+     * Gets the EventsApi instance owned by this GitLabApi instance. The EventsApi is used
+     * to perform all events related API calls.
+     *
+     * @return the EventsApi instance owned by this GitLabApi instance
+     */
+    public EventsApi getEventsApi() {
+        return (eventsApi);
+    }
 }

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

@@ -5,6 +5,8 @@ import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlRootElement;
 
+import org.gitlab4j.api.Constants.TargetType;
+
 @XmlRootElement
 @XmlAccessorType(XmlAccessType.FIELD)
 public class Event {
@@ -17,7 +19,7 @@ public class Event {
     private Integer projectId;
     private Integer targetId;
     private String targetTitle;
-    private String targetType;
+    private TargetType targetType;
     private String title;
 
     public String getActionName() {
@@ -84,11 +86,11 @@ public class Event {
         this.targetTitle = targetTitle;
     }
 
-    public String getTargetType() {
+    public TargetType getTargetType() {
         return targetType;
     }
 
-    public void setTargetType(String targetType) {
+    public void setTargetType(TargetType targetType) {
         this.targetType = targetType;
     }
 

src/main/java/org/gitlab4j/api/utils/JacksonJsonEnumHelper.java

@@ -8,15 +8,41 @@ import com.fasterxml.jackson.annotation.JsonCreator;
 public class JacksonJsonEnumHelper<E extends Enum<E>> {
 
     private Map<String, E> valuesMap;
+    private Map<E, String> namesMap;
 
     public JacksonJsonEnumHelper(Class<E> enumType) {
+        this(enumType, false);
+    }
+
+    public JacksonJsonEnumHelper(Class<E> enumType, boolean firstLetterCapitalized) {
+
         valuesMap = new HashMap<>();
-        for (E e : enumType.getEnumConstants())
-            valuesMap.put(e.name().toLowerCase(), e);
+        namesMap = new HashMap<>();
+
+        for (E e : enumType.getEnumConstants()) {
+
+            String name = e.name().toLowerCase();
+            if (firstLetterCapitalized) {
+                name = name.substring(0, 1).toUpperCase() + name.substring(1);
+            }
+
+            valuesMap.put(name, e);
+            namesMap.put(e, name);
+        }
     }
 
     @JsonCreator
     public E forValue(String value) {
         return valuesMap.get(value);
     }
+
+    /**
+     * Get the string used by the API for this enum.
+     *
+     * @param e the enum value to get the API string for
+     * @return the string used by the API for this enum
+     */
+    public String toString(E e) {
+        return (namesMap.get(e));
+    }
 }
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