Adding a shared library for common classes

aurora-shared/.gitignore

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+start*.sh

aurora-shared/Cursor/Cursor.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Aurora.Cursor
+{
+    public enum SortDirection
+    {
+        Asc,
+        Desc,
+    }
+
+    public class Cursor<T> where T : ICursorObject
+    {
+        private CursorList<T> _list;
+
+        private string _previousPageToken;
+        private string _nextPageToken;
+        private int _pageSize;
+        private Func<KeyValuePair<string, T>, string> _sortDelgate;
+        private SortDirection _direction;
+        public Cursor(ref CursorList<T> list)
+        {
+            this._list = list;
+            this._previousPageToken = string.Empty;
+            this._nextPageToken = string.Empty;
+            this._pageSize = 10;
+            this._sortDelgate = delegate (KeyValuePair<string, T> item)
+            {
+                return item.Key;
+            };
+        }
+
+        public CursorResult<T> GetNextPage()
+        {
+            if (this._pageSize < 0)
+            {
+                throw new InvalidOperationException("Page Size must be greater than zero");
+            }
+            List<KeyValuePair<string, T>> tmpList;
+
+            // Sort reference list
+            if (this._direction == SortDirection.Desc)
+            {
+                tmpList = this._list.OrderByDescending(this._sortDelgate).ToList();
+
+            }
+            else
+            {
+                tmpList = this._list.OrderBy(this._sortDelgate).ToList();
+            }
+
+            if (tmpList == null)
+            {
+                throw new System.NullReferenceException();
+            }
+
+            int startIdx = 0;
+            if (!string.IsNullOrEmpty(this._nextPageToken))
+            {
+                // TODO find another way to index into the list that's not a regular array search
+                startIdx = tmpList.FindIndex(item => item.Key == this._nextPageToken) + 1;
+            }
+
+            int adjustedSize = this._pageSize;
+            if (startIdx + this._pageSize > tmpList.Count)
+            {
+                adjustedSize = this._pageSize - ((startIdx + _pageSize) - tmpList.Count);
+            }
+
+
+            List<KeyValuePair<string, T>> selection = new List<KeyValuePair<string, T>>();
+            if (adjustedSize != 0)
+            {
+                selection = tmpList.GetRange(startIdx, adjustedSize);
+            }
+
+            return new CursorResult<T>
+            {
+                NextPageToken = this._pageSize == selection.Count ? selection[selection.Count - 1].Key : string.Empty,
+                PrevPageToken = string.Empty,
+                Count = this._list.Count,
+                Result = selection.ConvertAll(item => item.Value)
+            };
+        }
+
+        public CursorResult<T> GetPreviousPage()
+        {
+            throw new NotImplementedException();
+        }
+
+        public Cursor<T> WithNextPageToken(string nextPageToken)
+        {
+            this._nextPageToken = nextPageToken;
+            return this;
+        }
+
+        public Cursor<T> WithPreviousPageToken(string prevPageToken)
+        {
+            this._previousPageToken = prevPageToken;
+            return this;
+        }
+
+        public Cursor<T> WithSort(Func<KeyValuePair<string, T>, string> sortDelegate, SortDirection direction)
+        {
+            this._sortDelgate = sortDelegate;
+            this._direction = direction;
+            return this;
+        }
+
+        public Cursor<T> WithSort(string key, SortDirection direction)
+        {
+            this._sortDelgate = (item) => key;
+            this._direction = direction;
+            return this;
+        }
+
+        public Cursor<T> WithSize(int size)
+        {
+            this._pageSize = size;
+            return this;
+        }
+    }
+
+}

aurora-shared/Cursor/CursorList.cs

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+using System.Collections.Generic;
+using System.Collections;
+using System;
+using System.Linq;
+using Aurora.Utils;
+
+namespace Aurora.Cursor
+{
+
+    public class CursorList<T> : SortedList<string, T> where T : ICursorObject
+    {
+
+        public CursorList()
+        {
+        }
+
+        public CursorList<T> Add(T item)
+        {
+            string id = item.Id;
+            if (item.Id == null)
+            {
+                id = HashUtil.GetHash(new string[] { item.GetHashCode().ToString() }).ToString();
+                item.Id = id;
+            }
+            this.Add(id, item);
+
+            return this;
+        }
+
+
+    }
+}

aurora-shared/Cursor/CursorObject.cs

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+using System.Collections.Generic;
+
+namespace Aurora.Cursor
+{
+    public interface ICursorObject
+    {
+        string Id { get; set; }
+    }
+}

aurora-shared/Cursor/CursorResult.cs

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+using System.Collections.Generic;
+
+namespace Aurora.Cursor
+{
+    public class CursorResult<T>
+    {
+        public CursorResult()
+        {
+            Result = new List<T>();
+        }
+
+        public CursorResult(CursorResult<T> cpy)
+        {
+            NextPageToken = cpy.NextPageToken;
+            PrevPageToken = cpy.PrevPageToken;
+            Result = cpy.Result;
+            Count = cpy.Count;
+        }
+
+        public string NextPageToken { get; set; }
+        public string PrevPageToken { get; set; }
+        public List<T> Result { get; set; }
+        public int Count { get; set; }
+    }
+}

aurora-shared/Utils/HashUtil.cs

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+using System.Security.Cryptography;
+using System.Text;
+using System;
+
+namespace Aurora.Utils
+{
+    public class HashUtil
+    {
+        public static Guid GetHash(string[] inputs)
+        {
+            string input = "";
+            foreach (string str in inputs)
+            {
+                input += str;
+            }
+
+            byte[] stringbytes = Encoding.UTF8.GetBytes(input);
+            byte[] hashedBytes = new System.Security.Cryptography
+                .SHA1CryptoServiceProvider()
+                .ComputeHash(stringbytes);
+            Array.Resize(ref hashedBytes, 16);
+            return new Guid(hashedBytes);
+        }
+    }
+}

aurora-shared/aurora-shared.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <RootNamespace>aurora_shared</RootNamespace>
+  </PropertyGroup>
+
+</Project>