[995] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2008 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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[1131] | 23 | using System.Data;
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[925] | 24 | using System.Collections.Generic;
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| 25 | using System.Linq;
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| 26 | using System.Text;
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[995] | 27 | using HeuristicLab.Hive.Contracts.BusinessObjects;
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| 28 | using System.Runtime.CompilerServices;
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[925] | 29 |
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| 30 | namespace HeuristicLab.Hive.Server.ADODataAccess {
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[995] | 31 | abstract class DataAdapterBase<AdapterT, ObjT, RowT>
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[1128] | 32 | where AdapterT : new()
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| 33 | where RowT : System.Data.DataRow
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| 34 | where ObjT : IHiveObject, new() {
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[1131] | 35 | protected AdapterT Adapter {
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| 36 | get {
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| 37 | return new AdapterT();
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| 38 | }
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| 39 | }
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[925] | 40 |
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[995] | 41 | #region Abstract methods
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[1131] | 42 | protected abstract RowT ConvertObj(ObjT obj, RowT row);
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[995] | 43 |
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[1131] | 44 | protected abstract ObjT ConvertRow(RowT row, ObjT obj);
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[995] | 45 |
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[1093] | 46 | [MethodImpl(MethodImplOptions.Synchronized)]
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[995] | 47 | protected abstract RowT InsertNewRow(ObjT obj);
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| 48 |
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[1093] | 49 | [MethodImpl(MethodImplOptions.Synchronized)]
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[995] | 50 | protected abstract void UpdateRow(RowT row);
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| 51 |
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| 52 | protected abstract IEnumerable<RowT> FindById(long id);
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| 53 |
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| 54 | protected abstract IEnumerable<RowT> FindAll();
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| 55 | #endregion
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| 56 |
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| 57 | protected delegate IEnumerable<RowT> Selector();
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| 58 |
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[1131] | 59 | protected ObjT Convert(RowT row, ObjT obj) {
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| 60 | try {
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| 61 | obj = ConvertRow(row, obj);
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| 62 | return obj;
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| 63 | }
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| 64 | catch (DeletedRowInaccessibleException) {
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| 65 | return default(ObjT);
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| 66 | }
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| 67 | catch (RowNotInTableException) {
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| 68 | return default(ObjT);
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| 69 | }
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| 70 | }
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| 71 |
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[995] | 72 | protected virtual RowT FindSingleRow(Selector selector) {
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| 73 | RowT row = default(RowT);
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| 74 |
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| 75 | IEnumerable<RowT> found =
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| 76 | selector();
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| 77 |
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| 78 | if (found.Count<RowT>() == 1)
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| 79 | row = found.First<RowT>();
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| 80 |
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| 81 | return row;
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[925] | 82 | }
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| 83 |
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[995] | 84 | protected virtual ObjT FindSingle(Selector selector) {
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| 85 | RowT row = FindSingleRow(selector);
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| 86 |
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| 87 | if (row != null) {
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| 88 | ObjT obj = new ObjT();
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[1131] | 89 | obj = Convert(row, obj);
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[995] | 90 |
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| 91 | return obj;
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| 92 | } else {
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| 93 | return default(ObjT);
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| 94 | }
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[925] | 95 | }
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[995] | 96 |
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| 97 | protected virtual ICollection<ObjT> FindMultiple(Selector selector) {
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| 98 | IEnumerable<RowT> found =
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| 99 | selector();
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| 100 |
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| 101 | IList<ObjT> result =
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| 102 | new List<ObjT>();
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| 103 |
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| 104 | foreach (RowT row in found) {
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| 105 | ObjT obj = new ObjT();
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[1131] | 106 | obj = Convert(row, obj);
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| 107 | if(obj != null)
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| 108 | result.Add(obj);
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[995] | 109 | }
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| 110 |
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| 111 | return result;
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| 112 | }
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| 113 |
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| 114 | protected virtual RowT GetRowById(long id) {
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| 115 | return FindSingleRow(
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| 116 | delegate() {
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| 117 | return FindById(id);
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| 118 | });
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| 119 | }
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| 120 |
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| 121 | [MethodImpl(MethodImplOptions.Synchronized)]
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| 122 | public virtual void Update(ObjT obj) {
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| 123 | if (obj != null) {
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| 124 | RowT row =
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| 125 | GetRowById(obj.Id);
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| 126 |
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| 127 | if (row == null) {
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| 128 | row = InsertNewRow(obj);
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| 129 | }
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| 130 |
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[1131] | 131 | ConvertObj(obj, row);
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[995] | 132 |
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| 133 | UpdateRow(row);
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| 134 |
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| 135 | obj.Id = (long)row[row.Table.PrimaryKey[0]];
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| 136 | }
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| 137 | }
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| 138 |
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| 139 | public virtual ObjT GetById(long id) {
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| 140 | return FindSingle(delegate() {
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| 141 | return FindById(id);
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| 142 | });
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| 143 | }
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| 144 |
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| 145 | public virtual ICollection<ObjT> GetAll() {
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| 146 | return new List<ObjT>(
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| 147 | FindMultiple(
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| 148 | new Selector(FindAll)));
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| 149 | }
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| 150 |
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| 151 | [MethodImpl(MethodImplOptions.Synchronized)]
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| 152 | public virtual bool Delete(ObjT obj) {
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| 153 | if (obj != null) {
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| 154 | RowT row =
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| 155 | GetRowById(obj.Id);
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| 156 |
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| 157 | if (row != null) {
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| 158 | row.Delete();
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| 159 | UpdateRow(row);
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[1025] | 160 |
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| 161 | return true;
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[995] | 162 | }
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| 163 | }
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| 164 |
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| 165 | return false;
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| 166 | }
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[925] | 167 | }
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| 168 | }
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[1128] | 169 |
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