Initial commit (#424).

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

+package org.gitlab4j.api.models;
+
+import org.gitlab4j.api.utils.JacksonJson;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+public class IssuesStatistics {
+
+    private Statistics statistics;
+
+    public Statistics getStatistics() {
+        return statistics;
+    }
+
+    public void setStatistics(Statistics statistics) {
+        this.statistics = statistics;
+    }
+
+    @JsonIgnore
+    public Counts getCounts() {
+        return (statistics != null ? statistics.counts : null);
+    }
+
+    public static class Statistics {
+        private Counts counts;
+
+        public Counts getCounts() {
+            return counts;
+        }
+
+        public void setCounts(Counts counts) {
+            this.counts = counts;
+        }
+    }
+
+    public static class Counts {
+
+        private Integer all;
+        private Integer closed;
+        private Integer opened;
+
+        public Integer getAll() {
+            return all;
+        }
+
+        public void setAll(Integer all) {
+            this.all = all;
+        }
+
+        public Integer getClosed() {
+            return closed;
+        }
+
+        public void setClosed(Integer closed) {
+            this.closed = closed;
+        }
+
+        public Integer getOpened() {
+            return opened;
+        }
+
+        public void setOpened(Integer opened) {
+            this.opened = opened;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return (JacksonJson.toJsonString(this));
+    }
+}

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

+package org.gitlab4j.api.models;
+
+import java.util.Date;
+import java.util.List;
+
+import org.gitlab4j.api.Constants.IssueScope;
+import org.gitlab4j.api.GitLabApiException;
+import org.gitlab4j.api.GitLabApiForm;
+import org.gitlab4j.api.utils.ISO8601;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+/**
+ *  This class is used to filter issues when getting issue statistics. of them.
+ */
+public class IssuesStatisticsFilter {
+
+    private List<String> labels;
+    private String milestone;
+    private IssueScope scope;
+    private Integer authorId;
+    private Integer assigneeId;
+    private String myReactionEmoji;
+    private List<Integer> iids;
+    private String search;
+    private String in;
+    private Date createdAfter;
+    private Date createdBefore;
+    private Date updatedAfter;
+    private Date updatedBefore;   
+    private Boolean confidential;
+
+    public IssuesStatisticsFilter withLabels(List<String> labels) {
+        this.labels = labels;
+        return (this);
+    }
+    
+    public IssuesStatisticsFilter withIids(List<Integer> iids) {
+        this.iids = iids;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withMilestone(String milestone) {
+        this.milestone = milestone;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withScope(IssueScope scope) {
+        this.scope = scope;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withAuthorId(Integer authorId) {
+        this.authorId = authorId;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withAssigneeId(Integer assigneeId) {
+        this.assigneeId = assigneeId;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withMyReactionEmoji(String myReactionEmoji) {
+        this.myReactionEmoji = myReactionEmoji;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withSearch(String search) {
+        this.search = search;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withIn(String in) {
+        this.in = in;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withCreatedAfter(Date createdAfter) {
+        this.createdAfter = createdAfter;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withCreatedBefore(Date createdBefore) {
+        this.createdBefore = createdBefore;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withUpdatedAfter(Date updatedAfter) {
+        this.updatedAfter = updatedAfter;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withUpdatedBefore(Date updatedBefore) {
+        this.updatedBefore = updatedBefore;
+        return (this);
+    }
+
+    public IssuesStatisticsFilter withConfidential(Boolean confidential) {
+        this.confidential = confidential;
+        return (this);
+    }
+
+    @JsonIgnore
+    public GitLabApiForm getQueryParams() throws GitLabApiException  {
+
+        return (new GitLabApiForm()
+                .withParam("labels", (labels != null ? String.join(",", labels) : null))
+                .withParam("iids", iids)
+                .withParam("milestone", milestone)
+                .withParam("scope", scope)
+                .withParam("author_id", authorId)
+                .withParam("assignee_id", assigneeId)
+                .withParam("my_reaction_emoji", myReactionEmoji)
+                .withParam("search", search)
+                .withParam("in", in)
+                .withParam("created_after", ISO8601.toString(createdAfter, false))
+                .withParam("created_before", ISO8601.toString(createdBefore, false))
+                .withParam("updated_after", ISO8601.toString(updatedAfter, false))
+                .withParam("updated_before", ISO8601.toString(updatedBefore, false))
+                .withParam("confidential", confidential));
+    }
+}

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

+package org.gitlab4j.api.models;
+
+import java.util.Date;
+import java.util.List;
+
+import org.gitlab4j.api.utils.JacksonJson;
+
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+public class ProjectFetches {
+
+    public static class DateCount {
+
+        private Integer count;
+
+        @JsonSerialize(using = JacksonJson.DateOnlySerializer.class)
+        private Date date;
+
+        public Integer getCount() {
+            return count;
+        }
+
+        public void setCount(Integer count) {
+            this.count = count;
+        }
+
+        public Date getDate() {
+            return date;
+        }
+
+        public void setDate(Date date) {
+            this.date = date;
+        }
+    }
+
+    public static class Fetches {
+
+        private Integer total;
+        private List<DateCount> days;
+
+        public Integer getTotal() {
+            return total;
+        }
+
+        public void setTotal(Integer total) {
+            this.total = total;
+        }
+
+        public List<DateCount> getDays() {
+            return days;
+        }
+
+        public void setDays(List<DateCount> days) {
+            this.days = days;
+        }
+    }
+
+    private Fetches fetches;
+
+    public Fetches getFetches() {
+        return fetches;
+    }
+
+    public void setFetches(Fetches fetches) {
+        this.fetches = fetches;
+    }
+
+    @Override
+    public String toString() {
+        return (JacksonJson.toJsonString(this));
+    }
+}

src/test/resources/org/gitlab4j/api/issues-statistics.json

+{
+  "statistics": {
+    "counts": {
+      "all": 20,
+      "closed": 5,
+      "opened": 15
+    }
+  }
+}
\ No newline at end of file

src/test/resources/org/gitlab4j/api/project-fetches.json

+{
+  "fetches": {
+    "total": 50,
+    "days": [
+      {
+        "count": 10,
+        "date": "2018-01-10"
+      },
+      {
+        "count": 10,
+        "date": "2018-01-09"
+      },
+      {
+        "count": 10,
+        "date": "2018-01-08"
+      },
+      {
+        "count": 10,
+        "date": "2018-01-07"
+      },
+      {
+        "count": 10,
+        "date": "2018-01-06"
+      }
+    ]
+  }
+}
\ No newline at end of file