286 lines
10 KiB
C#
286 lines
10 KiB
C#
//
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// Class: IDatabaseEntity
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// Current CLR: 4.0.30319.34209
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// System: Microsoft Visual Studio 10.0
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// Author: dani
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// Created: 3/2/2015 9:08:47 PM
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//
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// Copyright (c) 2015 Informatikbüro Daniel Schick. All rights reserved.
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using System;
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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 System.Collections.Generic;
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using System.Reflection;
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using System.Text.RegularExpressions;
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namespace bsmd.database
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{
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public abstract class DatabaseEntity : IMessageParagraph, IEquatable<DatabaseEntity>
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{
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protected Guid? id;
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protected string tablename;
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private Guid instance_id = Guid.NewGuid(); // Comparison id in case entity has not been saved
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#region enum ValidationBlock
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public enum ValidationBlock
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{
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BLOCK1,
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BLOCK2
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}
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#endregion
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#region Properties
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/// <summary>
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/// Nachrichtentyp der abgeleiteten Meldeklassen
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/// </summary>
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public Message.NotificationClass MessageNotificationClass { get; set; }
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public string MessageNotificationClassDisplay
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{
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get
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{
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return this.MessageNotificationClass.ToString();
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}
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}
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/// <summary>
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/// Referenz zur eigentlichen Schiffankunft
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/// </summary>
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public MessageCore MessageCore { get; set; }
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/// <summary>
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/// gemeinschaftliche Daten
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/// </summary>
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public Message MessageHeader { get; set; }
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/// <summary>
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/// SQL Table name to construct queries
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/// </summary>
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public virtual string Tablename { get { return this.tablename; } }
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/// <summary>
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/// primary key
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/// </summary>
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public Guid? Id { get { return this.id; } }
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/// <summary>
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/// IsNew Flag
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/// </summary>
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public bool IsNew { get { return !this.id.HasValue; } }
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#endregion
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#region public funcs
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/// <summary>
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/// when it's time (during save), create id
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/// </summary>
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public void CreateId() { this.id = Guid.NewGuid(); }
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public abstract void PrepareSave(IDbCommand cmd);
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public virtual void PrepareDelete(IDbCommand cmd)
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{
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SqlCommand scmd = cmd as SqlCommand;
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scmd.CommandText = string.Format("DELETE FROM {0} WHERE Id = @ID", Tablename);
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scmd.Parameters.AddWithValue("@ID", this.Id);
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}
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/// <summary>
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/// Ergebnismenge begrenzen: NULL = kein Limit. Abgeleitete Klassen *können* diesen Parameter berücksichtigen
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/// </summary>
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public int? ResultLimit { get; set; }
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public abstract void PrepareLoadCommand(IDbCommand cmd, Message.LoadFilter filter, params object[] criteria);
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public abstract List<DatabaseEntity> LoadList(IDataReader reader);
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public virtual void PrepareCountCmd(IDbCommand cmd, Message.LoadFilter filter, params object[] criteria)
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{
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SqlCommand scmd = cmd as SqlCommand;
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scmd.CommandText = string.Format("SELECT COUNT(*) FROM {0}", Tablename);
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}
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/// <summary>
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/// Überprüft eingegangene Meldeklassen auf Fehlerkonditionen
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/// </summary>
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/// <param name="errors"></param>
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/// <param name="violations"></param>
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public virtual void Validate(List<MessageError> errors, List<MessageViolation> violations)
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{
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errors = new List<MessageError>();
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violations = new List<MessageViolation>();
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}
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/// <summary>
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/// Diese Methode sollte eigentlich nie einen Effekt haben und dient nur dazu, dass keine Situation
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/// auftreten kann in der ein Insert/Update an fehlender Datenvalidierung kracht
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/// </summary>
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/// <param name="truncated"></param>
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public virtual void TruncateFields(List<string> truncated)
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{
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List<PropertyInfo> props = new List<PropertyInfo>();
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// add flagged properties to check list
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props.AddRange(this.GetType().GetProperties().Where(prop => Attribute.IsDefined(prop, typeof(MaxLengthAttribute))));
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foreach (PropertyInfo property in props)
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{
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object propValue = property.GetValue(this, null);
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string value = (propValue == null) ? string.Empty : propValue.ToString();
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MaxLengthAttribute maxLengthAttribute = Attribute.GetCustomAttribute(property, typeof(MaxLengthAttribute))
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as MaxLengthAttribute;
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if(value.Length > maxLengthAttribute.MaxLength) // truncate situation
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{
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string maxLengthValue = value.Substring(0, maxLengthAttribute.MaxLength);
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truncated.Add(string.Format("[{0} ({1})]: {2}", property.Name, maxLengthAttribute.MaxLength, value));
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property.SetValue(this, maxLengthValue);
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}
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}
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}
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/// <summary>
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/// Kann überschrieben werden, wenn abhängig von den Daten (einem Flag) andere Regeln gelten (Bsp. wenn schon eine
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/// MDH Meldung abgegeben wurde)
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/// </summary>
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/// <returns></returns>
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public virtual ValidationBlock GetValidationBlock()
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{
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return ValidationBlock.BLOCK1;
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}
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#endregion
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#region public static funcs
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/// <summary>
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/// Wenn Positionen manuell (ENI-2) angelegt werden, kann mit dieser Funktion der neue "Identifier"
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/// festgelegt werden
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/// </summary>
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/// <param name="sublist">Vorhandene Position</param>
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/// <returns>Name des neuen Identifiers, der so nicht in der Liste vorkommt</returns>
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public static string GetNewIdentifier(IEnumerable<DatabaseEntity> sublist)
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{
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int maxVal = -1;
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string maxString = null;
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// das sieht riskanter aus als es ist, diese Funktion wird aber nur für Elemente angewendet, die
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// ISublistElement implementieren
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foreach(ISublistElement element in sublist)
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{
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if (element.Identifier.IsNullOrEmpty()) continue;
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int elementIdent;
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// TODO: Beim Parsen auch Text- und allerlei bunte Erweiterungen tolerieren
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// (z.B. MARPOL-000001)
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Regex re = new Regex(@"\d+");
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Match m = re.Match(element.Identifier);
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if (m.Success)
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{
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elementIdent = Int32.Parse(m.Value);
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if (elementIdent > maxVal)
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{
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maxVal = elementIdent;
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maxString = element.Identifier.Replace(m.Value, (maxVal + 1).ToString());
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}
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}
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}
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if (maxVal == -1) return 1.ToString();
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return maxString;
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}
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#endregion
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#region IEquatable<T> implementation
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public bool Equals(DatabaseEntity other)
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{
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if (other == null) return false;
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if (this.Id.HasValue && other.Id.HasValue && (this.Id.Value != Guid.Empty) && (other.Id.Value != Guid.Empty))
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return this.Id == other.Id;
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return this.GetHashCode() == other.GetHashCode();
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}
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public override bool Equals(object obj)
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{
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return this.Equals(obj as DatabaseEntity);
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}
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public override int GetHashCode()
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{
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if (!this.Id.HasValue || this.Id.Value == Guid.Empty)
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return this.instance_id.GetHashCode();
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return this.Id.GetHashCode();
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}
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#endregion
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#region IMessageParagraph implementation
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public virtual string Title
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{
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get
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{
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string name = this.GetType().Name;
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return name;
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}
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}
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public virtual string Subtitle
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{
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get { return string.Empty; }
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}
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public virtual bool ShowChildrenAsTable
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{
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get { return false; }
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}
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/// <summary>
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/// must be overridden if it must make sense
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/// </summary>
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public virtual List<KeyValuePair<string, string>> MessageText
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{
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get {
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List<KeyValuePair<string, string>> result = new List<KeyValuePair<string, string>>();
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Type objType = this.GetType();
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var props = objType.GetProperties().Where(
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prop => Attribute.IsDefined(prop, typeof(ShowReportAttribute)));
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foreach (PropertyInfo property in props)
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{
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bool isDouble = (property.PropertyType == typeof(Nullable<double>));
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object propValue = property.GetValue(this, null);
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string value = (propValue == null) ? string.Empty : (isDouble ? ((double) propValue).ToString("N2") : propValue.ToString());
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string displayName = property.Name;
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if(Attribute.IsDefined(property, typeof(ReportDisplayNameAttribute))) {
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ReportDisplayNameAttribute reportDisplayNameAttribute = Attribute.GetCustomAttribute(property, typeof(ReportDisplayNameAttribute))
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as ReportDisplayNameAttribute;
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displayName = reportDisplayNameAttribute.DisplayName;
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}
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result.Add(new KeyValuePair<string, string>(displayName, value));
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}
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return result;
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}
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}
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public virtual List<IMessageParagraph> ChildParagraphs { get { return null; } }
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#endregion
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}
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}
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