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203 lines
9.3 KiB
C#
203 lines
9.3 KiB
C#
using eu.railduction.netcore.dll.Database_Attribute_System.Attributes;
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Text;
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namespace eu.railduction.netcore.dll.Database_Attribute_System
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{
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public class ClassAction
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{
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private static List<Type> initiatedClassTypes = new List<Type>() { };
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/// <summary>
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/// Initiates the attribute-system and preloads all necessary information<para/>
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/// INFO: Will initiate necessary foreignObjects recursively!<para/>
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/// If an class is already initiated, it will be ignored!
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/// </summary>
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/// <param name="classType">The classType to preload</param>
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/// <returns>DbObject-attribute corresponding to the class</returns>
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public static DbObject Init(Type classType)
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{
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// Check if given class is marked as dbObject
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if (!(classType.GetCustomAttribute(typeof(DbObject), true) is DbObject dbObject)) throw new InvalidOperationException($"Cannot init '{classType.Name}'. Missing Attribute 'DbObject'");
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if (!initiatedClassTypes.Contains(classType))
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{
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dbObject.Init(classType); // Init dbObject
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initiatedClassTypes.Add(classType); // Set it to the list
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}
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return dbObject;
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}
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/// <summary>
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/// Fills an given dbObject with given data<para/>
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/// Data-attribute-names and class-fieldNames have to match! (non case-sensitive)
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="classObject">Given object (marked with Db-attributes)</param>
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/// <param name="data">The data</param>
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/// <param name="runDataLossChecks">This checks if any class-field and data-attribute does not exists in either (Slower)</param>
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public static void FillObject<T>(T classObject, Dictionary<string, object> data)
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{
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Type classType = classObject.GetType();
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// Read dbObject-attribute
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DbObject dbObject = ClassAction.Init(classType);
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// Iterate through data
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foreach (KeyValuePair<string, object> data_keySet in data)
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{
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// Interate through class-fields
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foreach (BaseAttribute baseAttribute in dbObject.baseAttributes)
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{
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// If its a match, set the value
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if (baseAttribute._attributeName.ToLower() == data_keySet.Key.ToLower())
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{
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baseAttribute.parentField.SetValue(classObject, data_keySet.Value);
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break;
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}
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}
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}
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}
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/// <summary>
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/// Gets an dbObject by primaryKey/s
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="classObject">Given object (marked with Db-attributes)</param>
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/// <param name="queryExecutor">Function to handle query-calls - Has to return Dictionary[attributeName, attributeValue]</param>
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public static T GetByPrimaryKey<T>(Type classType, object primaryKeyValue, Func<string, List<Dictionary<string, object>>> queryExecutor) where T : new()
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{
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Dictionary<string, object> primaryKeyData = new Dictionary<string, object>() { };
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primaryKeyData.Add(null, primaryKeyValue);
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return GetByPrimaryKey<T>(classType, primaryKeyData, queryExecutor);
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}
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public static T GetByPrimaryKey<T>(Type classType, string primaryKeyName, object primaryKeyValue, Func<string, List<Dictionary<string, object>>> queryExecutor) where T : new()
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{
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Dictionary<string, object> primaryKeyData = new Dictionary<string, object>() { };
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primaryKeyData.Add(primaryKeyName, primaryKeyValue);
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return GetByPrimaryKey<T>(classType, primaryKeyData, queryExecutor);
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}
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public static T GetByPrimaryKey<T>(Type classType, Dictionary<string, object> primaryKeyData, Func<string, List<Dictionary<string, object>>> queryExecutor) where T: new()
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{
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// Create new empty object
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T obj = new T();
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// Read dbObject-attribute
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DbObject dbObject = ClassAction.Init(classType);
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// iterate thru them to check and fill object
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foreach (DbPrimaryKey primaryKeyAtt in dbObject.primaryKeyAttributes)
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{
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bool dataMatchFound = false;
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// Now search the corresponding primaryKeyData
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foreach (KeyValuePair<string, object> primaryKey in primaryKeyData)
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{
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// primaryKey matches
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if(primaryKeyAtt._attributeName.ToLower() == primaryKey.Key.ToLower())
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{
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// Set data
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primaryKeyAtt.parentField.SetValue(obj, primaryKey.Value);
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dataMatchFound = true;
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break;
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}
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}
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// If no data was found matching this field
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if (!dataMatchFound) throw new InvalidOperationException($"Cannot create object with primaryKeyData. No data assigned to field '{primaryKeyAtt.parentField.Name}'");
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}
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ResolveByPrimaryKey<T>(obj, queryExecutor);
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return obj;
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}
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/// <summary>
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/// Resolves dbObject by primaryKey/s<pragma/>
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/// Object needs to have primaryKey/s set!
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="classObject">Given object (marked with Db-attributes)</param>
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/// <param name="queryExecutor">Function to handle query-calls - Has to return Dictionary[attributeName, attributeValue]</param>
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public static void ResolveByPrimaryKey<T>(T classObject, Func<string, List<Dictionary<string, object>>> queryExecutor)
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{
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string query = QueryBuilder.SelectByPrimaryKey(classObject); // Generate query
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List<Dictionary<string, object>> dataSet = queryExecutor(query); // Execute
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FillObject(classObject, dataSet[0]); // Fill the object
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}
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/// <summary>
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/// Gets a list of dbObjects by attribute/s
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="classType">Type of class</param>
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/// <param name="fields">class-fields for select</param>
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/// <param name="queryExecutor">Function to handle query-calls - Has to return Dictionary[attributeName, attributeValue]</param>
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/// <param name="runDataLossChecks">This checks if any class-field and data-attribute does not exists in either (Slower)</param>
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/// <returns>List of dbObjects</returns>
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public static List<T> GetListByAttribute<T>(Type classType, Dictionary<string, object> fields, Func<string, List<Dictionary<string, object>>> queryExecutor) where T : new()
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{
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// Read dbObject-attribute
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DbObject dbObject = ClassAction.Init(classType);
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Function.ConvertAttributeToDbAttributes(classType, fields);
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string query = QueryBuilder.SelectByAttribute(dbObject._tableName, fields); // Generate query
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List<Dictionary<string, object>> dataSet = queryExecutor(query); // Execute
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List<T> objs = new List<T>() { };
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foreach(Dictionary<string, object> data in dataSet)
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{
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T obj = new T(); // New object
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FillObject(obj, data); // Fill it
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objs.Add(obj); // Add to list
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}
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return objs; // Return list
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}
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/// <summary>
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/// Resolves all foreignKeys with the database<pragma/>
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/// Only works if the foreignKey is single (not assembled)!
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="classObject">Given object (marked with Db-attributes)</param>
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/// <param name="queryExecutor">Function to handle query-calls - Has to return Dictionary[attributeName, attributeValue]</param>
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/// <param name="max_depth">Determents how deep resolving will be executed</param>
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/// <param name="runDataLossChecks">This checks if any class-field and data-attribute does not exists in either (Slower)</param>
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public static void ResolveForeignKeys<T>(T classObject, Func<string, List<Dictionary<string, object>>> queryExecutor, int max_depth = 1) where T: new()
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{
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Type classType = classObject.GetType();
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// Read dbObject-attribute
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DbObject dbObject = ClassAction.Init(classType);
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foreach (DbForeignObject foreignObjectAtt in dbObject.foreignObjectAttributes)
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{
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object foreignObject_value = foreignObjectAtt.parentField.GetValue(classObject);
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// When its empty, get it
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if(foreignObject_value == null)
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{
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foreignObject_value = GetByPrimaryKey<T>(classType, foreignObjectAtt.foreignKeyAttribute.parentField.GetValue(classObject), queryExecutor); ;
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}
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// Recursive resolving
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if (max_depth - 1 > 0)
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{
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ResolveForeignKeys(foreignObject_value, queryExecutor, max_depth - 1);
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}
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}
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}
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}
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}
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