init
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.SqlClient;
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using System.Linq;
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using DTS.Common.Utilities.Logging;
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// ReSharper disable InconsistentNaming
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// ReSharper disable once CheckNamespace
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namespace DTS.Common.Classes
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{
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public class Tags
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{
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/// <summary>
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/// represents a single tag, which is composed of an ID and a string of text
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/// we don't currently let you obsolete, delete, or edit tags, just add
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/// </summary>
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public class Tag: ICloneable
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{
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public Tag(string tagText, int tagId)
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{
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ID = tagId;
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Text = tagText;
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IsObsolete = false;
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}
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public const int INVALID_ID = -1;
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public int ID { get; set; }
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public string Text { get; set; }
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public bool IsObsolete { get; set; }
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public Tag(Tag copy)
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{
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ID = copy.ID;
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Text = copy.Text;
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IsObsolete = copy.IsObsolete;
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}
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public Tag(IDataRecord reader)
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{
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try
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{
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ID = Convert.ToInt32(reader["TagId"]);
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IsObsolete = Convert.ToBoolean(reader["Obsolete"]);
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Text = Convert.ToString(reader["TagText"]);
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}
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catch (Exception ex)
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{
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APILogger.Log(ex);
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}
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}
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public Tag(DataRow dr)
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{
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try
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{
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IsObsolete = Convert.ToBoolean(dr["Obsolete"]);
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ID = Convert.ToInt32(dr["TagId"]);
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Text = Convert.ToString(dr["TagFields"]);
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}
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catch (Exception ex) { APILogger.Log(ex); }
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}
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public object Clone()
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{
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return new Tag(this);
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}
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}
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private static Tags _tagsInstance;
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//public static Tags TagsInstance
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//{
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// get
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// {
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// if (null == _tagsInstance) { _tagsInstance = new Tags(); }
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// return _tagsInstance;
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// }
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//}
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public static Tags GetTagsInstance(GetSqlCommandDelegate getSqlCommand)
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{
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if( null == _tagsInstance)
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{
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_tagsInstance = new Tags(getSqlCommand);
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}
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return _tagsInstance;
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}
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private static readonly object LOCK_OBJECT = new object();
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public Tags(GetSqlCommandDelegate getSqlCommand)
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{
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_tagsLookup = new Dictionary<string, Tag>();
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UpdateList(getSqlCommand);
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}
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/// <summary>
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/// holds a cached collection of tags. This collection however is currently only populated on startup
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/// and not updated except explicitly when a user adds a tag
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/// </summary>
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// ReSharper disable once RedundantDefaultMemberInitializer
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private readonly Dictionary<string, Tag> _tagsLookup = null;
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/// <summary>
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/// Adds a tag if not present in memory cache to db
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/// </summary>
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/// <param name="tagText"></param>
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/// <returns></returns>
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public static bool AddTag(string tagText, GetSqlCommandDelegate getSqlCommand)
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{
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if (string.IsNullOrEmpty(tagText)) { return false; }
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// is it already in the dictionary?
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var tags = Tags.GetTagsInstance(getSqlCommand);
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if (tags.ContainsTag(tagText)) return false;
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tags.Commit(new Tag(tagText, Tag.INVALID_ID), getSqlCommand);
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return true;
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}
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/// <summary>
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/// Changes the ID of a tag during database migration
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/// </summary>
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/// <param name="tagText"></param>
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/// <returns></returns>
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public static bool MigrateTag(string tagText, GetSqlCommandDelegate getSqlCommand)
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{
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if (string.IsNullOrEmpty(tagText)) { return false; }
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Tags.GetTagsInstance(getSqlCommand).Commit(new Tag(tagText, Tag.INVALID_ID), getSqlCommand);
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return true;
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}
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/// <summary>
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/// commits a tag to db if doesn't already exist in db
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/// </summary>
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/// <param name="tag"></param>
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private void Commit(Tag tag, GetSqlCommandDelegate getSqlCommand)
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{
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try
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{
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if (-1 == GetIDFromTagText(tag.Text, getSqlCommand))
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{
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Insert(tag, getSqlCommand);
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}
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else { UpdateAll(tag, getSqlCommand); }
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lock (LOCK_OBJECT)
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{
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_tagsLookup[tag.Text] = tag;
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}
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}
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catch (Exception ex)
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{
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APILogger.Log(ex);
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}
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}
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private void UpdateAll(Tag tag, GetSqlCommandDelegate getSqlCommand)
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{
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//nothing to do currently? (we don't let you rename or edit, or obsolete, or delete ...)
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tag.ID = GetTagIdFromText(tag.Text, getSqlCommand);
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}
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public delegate SqlCommand GetSqlCommandDelegate(bool bNewConnection);
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/// <summary>
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/// inserts a tag into the db
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/// </summary>
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/// <param name="tag"></param>
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private void Insert(Tag tag, GetSqlCommandDelegate getSqlCommand)
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{
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using (var cmd = getSqlCommand(true))
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{
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try
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{
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cmd.CommandType = CommandType.StoredProcedure;
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cmd.CommandText = "sp_TagsInsert";
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#region params
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cmd.Parameters.Add(new SqlParameter("@TagText", SqlDbType.NVarChar, 255) {Value = tag.Text});
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cmd.Parameters.Add(new SqlParameter("@Obsolete", SqlDbType.Bit) {Value = tag.IsObsolete});
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var newIdParam = new SqlParameter("@new_id", SqlDbType.Int) {Direction = ParameterDirection.Output};
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cmd.Parameters.Add(newIdParam);
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var errorNumberParam =
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new SqlParameter("@errorNumber", SqlDbType.Int) {Direction = ParameterDirection.Output};
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cmd.Parameters.Add(errorNumberParam);
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var errorMessageParam =
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new SqlParameter("@errorMessage", SqlDbType.NVarChar, 250)
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{
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Direction = ParameterDirection.Output
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};
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cmd.Parameters.Add(errorMessageParam);
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#endregion params
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cmd.ExecuteNonQuery();
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if (int.Parse(errorNumberParam.Value.ToString()) != 0)
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{
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//errorMessageParam.Value
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}
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tag.ID = int.Parse(newIdParam.Value.ToString());
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}
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finally
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{
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cmd.Connection.Dispose();
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}
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}
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}
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/// <summary>
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/// retrieves a string text associated with an ID FROM CACHED copies
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/// </summary>
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/// <param name="id"></param>
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/// <returns></returns>
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private string GetTagTextFromId(int id)
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{
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lock (LOCK_OBJECT)
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{
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if (_tagsLookup == null) return null;
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var e = _tagsLookup.GetEnumerator();
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while (e.MoveNext())
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{
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if (e.Current.Value.ID != id) continue;
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var returnText = e.Current.Value.Text;
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e.Dispose();
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return returnText;
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}
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}
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return null;
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}
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/// <summary>
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/// Gets an ID for a given tag text FROM DB
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/// returns InvalidID if not found
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/// </summary>
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/// <param name="text"></param>
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/// <returns></returns>
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private int GetTagIdFromText(string text, GetSqlCommandDelegate getSqlCommand)
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{
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using (var cmd = getSqlCommand(true))
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{
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try
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{
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cmd.CommandType = CommandType.StoredProcedure;
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cmd.CommandText = "sp_TagsGetId";
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#region params
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cmd.Parameters.Add(new SqlParameter("@TagText", SqlDbType.NVarChar, 255) {Value = text});
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var tagIdParam = new SqlParameter("@TagId", SqlDbType.Int) {Direction = ParameterDirection.Output};
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cmd.Parameters.Add(tagIdParam);
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#endregion params
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cmd.ExecuteNonQuery();
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if (DBNull.Value.Equals(tagIdParam.Value))
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{
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return Tag.INVALID_ID;
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}
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var tagIdtemp = int.Parse(tagIdParam.Value.ToString());
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return tagIdtemp == 0 ? Tag.INVALID_ID : tagIdtemp;
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}
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finally
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{
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cmd.Connection.Dispose();
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}
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}
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}
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/// <summary>
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/// returns true if a given tag text is contained in cached in memory tags
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/// </summary>
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/// <param name="text"></param>
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/// <returns></returns>
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public bool ContainsTag(string text)
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{
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lock (LOCK_OBJECT)
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{
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return _tagsLookup.ContainsKey(text);
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}
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}
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/// <summary>
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/// adds multiple tags at once
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/// note that tags will have their start trimmed before commiting
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/// </summary>
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/// <param name="tagText"></param>
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/// <returns></returns>
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public static bool[] AddRange(string[] tagText, GetSqlCommandDelegate getSqlCommand)
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{
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List<bool> rv = new List<bool>();
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if (null == tagText || 0 == tagText.Length) { return null; }
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foreach (string s in tagText)
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{
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var tag = s.TrimStart();
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rv.Add(AddTag(tag, getSqlCommand));
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}
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return rv.ToArray();
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}
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/// <summary>
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/// gets an ID for a given tag text FROM DB
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/// </summary>
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/// <param name="tagText"></param>
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/// <returns></returns>
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public static int GetIDFromTagText(string tagText, GetSqlCommandDelegate getSqlCommand)
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{
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return GetTagsInstance(getSqlCommand).GetTagIdFromText(tagText, getSqlCommand);
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}
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/// <summary>
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/// gets an array of ids given an array of tag texts
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/// </summary>
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/// <param name="tagText"></param>
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/// <returns></returns>
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public static int[] GetIDsFromTagText(string[] tagText, GetSqlCommandDelegate getSqlCommand)
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{
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if (null == tagText || 0 == tagText.Length) { return null; }
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return tagText.Select(s => s.TrimStart()).Select(text => GetIDFromTagText(text, getSqlCommand)).Where(id => id != Tag.INVALID_ID).ToArray();
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}
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/// <summary>
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/// returns a string for a given id from memory cache
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/// returns null if it doesn't exist or is an invalid id
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/// </summary>
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/// <param name="tagID"></param>
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/// <returns></returns>
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public static string GetTagTextFromID(int tagID, GetSqlCommandDelegate getSqlCommand)
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{
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if (0 > tagID || tagID == Tag.INVALID_ID)
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{
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// Not a valid ID
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return null;
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}
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return GetTagsInstance(getSqlCommand).GetTagTextFromId(tagID);
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}
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/// <summary>
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/// returns an array of tag text given an array of tag ids.
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/// skips invalid tags or tag text
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/// </summary>
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/// <param name="tagId"></param>
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/// <returns></returns>
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public static string[] GetTagTextFromIDs(int[] tagId, GetSqlCommandDelegate getSqlCommand)
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{
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if (null == tagId || 0 == tagId.Length) { return new string [0]; }
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return tagId.Where(i => i != Tag.INVALID_ID).Select(i => GetTagTextFromID(i,getSqlCommand)).Where(tag => !string.IsNullOrWhiteSpace(tag)).ToArray();
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}
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/// <summary>
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/// retrieves all tags and updates the cached dictionary of tags
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/// </summary>
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public void UpdateList(GetSqlCommandDelegate getSqlCommand)
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{
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lock (LOCK_OBJECT)
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{
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_tagsLookup.Clear();
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using (var cmd = getSqlCommand(true))
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{
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try
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{
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cmd.CommandType = CommandType.StoredProcedure;
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cmd.CommandText = "sp_TagsGet";
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cmd.Parameters.Add(new SqlParameter("@TagId", SqlDbType.Int) {Value = null});
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var reader = cmd.ExecuteReader();
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while (reader.Read())
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{
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var t = new Tag(reader);
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if (t.ID == 0) continue;
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_tagsLookup[t.Text] = t;
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}
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reader.Close();
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}
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finally
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{
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cmd.Connection.Dispose();
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}
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}
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}
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}
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}
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}
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