Initial commit (#325).

src/main/java/org/gitlab4j/api/webhook/EventChanges.java

+package org.gitlab4j.api.webhook;
+
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+
+import org.gitlab4j.api.utils.JacksonJson;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class EventChanges {
+
+    private List<Integer> updatedById;
+    private List<Date> updatedAt;
+    private Map<String, List<EventLabel>> labels;
+
+    public List<Integer> getUpdatedById() {
+        return updatedById;
+    }
+
+    public void setUpdatedById(List<Integer> updatedById) {
+        this.updatedById = updatedById;
+    }
+
+    public List<Date> getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(List<Date> updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    public Map<String, List<EventLabel>> getLabels() {
+        return labels;
+    }
+
+    public void setLabels(Map<String, List<EventLabel>> labels) {
+        this.labels = labels;
+    }
+
+    @Override
+    public String toString() {
+        return (JacksonJson.toJsonString(this));
+    }
+}

src/main/java/org/gitlab4j/api/webhook/EventLabel.java

+package org.gitlab4j.api.webhook;
+
+import java.util.Date;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlRootElement;
+
+import org.gitlab4j.api.utils.JacksonJson;
+import org.gitlab4j.api.utils.JacksonJsonEnumHelper;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonValue;
+
+@XmlRootElement
+@XmlAccessorType(XmlAccessType.FIELD)
+public class EventLabel {
+
+    public enum LabelType {
+    
+        PROJECT_LABEL;
+    
+        private static JacksonJsonEnumHelper<LabelType> enumHelper = new JacksonJsonEnumHelper<>(LabelType.class, true, true);
+    
+        @JsonCreator
+        public static LabelType forValue(String value) {
+            return enumHelper.forValue(value);
+        }
+    
+        @JsonValue
+        public String toValue() {
+            return (enumHelper.toString(this));
+        }
+    
+        @Override
+        public String toString() {
+            return (enumHelper.toString(this));
+        }
+    }
+
+    private Integer id;
+    private String title;
+    private String color;
+    private Integer projectId;
+    private Date createdAt;
+    private Date updatedAt;
+    private Boolean template;
+    private String description;
+    private LabelType type;
+    private Integer groupId;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public Integer getProjectId() {
+        return projectId;
+    }
+
+    public void setProjectId(Integer projectId) {
+        this.projectId = projectId;
+    }
+
+    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;
+    }
+
+    public Boolean getTemplate() {
+        return template;
+    }
+
+    public void setTemplate(Boolean template) {
+        this.template = template;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public LabelType getType() {
+        return type;
+    }
+
+    public void setType(LabelType type) {
+        this.type = type;
+    }
+
+    public Integer getGroupId() {
+        return groupId;
+    }
+
+    public void setGroupId(Integer groupId) {
+        this.groupId = groupId;
+    }
+
+    @Override
+    public String toString() {
+        return (JacksonJson.toJsonString(this));
+    }
+}