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0
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Data.Services.Providers;
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4 using System.Linq;
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5 using System.Linq.Expressions;
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6
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7 namespace BLToolkit.ServiceModel
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8 {
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9 using Data.Linq;
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10 using Data.Sql;
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11 using Mapping;
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12
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13 public class DataService<T> : System.Data.Services.DataService<T>, IServiceProvider
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14 where T : IDataContext
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15 {
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16 #region Init
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17
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18 public DataService()
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19 {
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20 if (_defaultMetadata == null)
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21 _defaultMetadata = Tuple.Create(default(T), new MetadataInfo(Map.DefaultSchema));
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22
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23 _metadata = new MetadataProvider(_defaultMetadata.Item2);
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24 _query = new QueryProvider (_defaultMetadata.Item2);
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25 _update = new UpdateProvider (_defaultMetadata.Item2, _metadata, _query);
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26 }
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27
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28 static Tuple<T,MetadataInfo> _defaultMetadata;
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29
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30 public DataService(MappingSchema mappingSchema)
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31 {
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32 lock (_cache)
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33 {
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34 Tuple<T,MetadataInfo> data;
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35
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36 if (!_cache.TryGetValue(mappingSchema, out data))
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37 data = Tuple.Create(default(T), new MetadataInfo(mappingSchema));
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38
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39 _metadata = new MetadataProvider(data.Item2);
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40 _query = new QueryProvider (data.Item2);
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41 _update = new UpdateProvider (data.Item2, _metadata, _query);
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42 }
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43 }
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44
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45 readonly static Dictionary<MappingSchema,Tuple<T,MetadataInfo>> _cache =
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46 new Dictionary<MappingSchema,Tuple<T,MetadataInfo>>();
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47
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48 readonly MetadataProvider _metadata;
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49 readonly QueryProvider _query;
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50 readonly UpdateProvider _update;
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51
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52 #endregion
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53
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54 #region Public Members
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55
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56 public object GetService(Type serviceType)
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57 {
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58 if (serviceType == typeof(IDataServiceMetadataProvider)) return _metadata;
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59 if (serviceType == typeof(IDataServiceQueryProvider)) return _query;
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60 if (serviceType == typeof(IDataServiceUpdateProvider)) return _update;
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61
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62 return null;
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63 }
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64
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65 #endregion
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66
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67 #region MetadataInfo
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68
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69 class TypeInfo
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70 {
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71 public ResourceType Type;
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72 public SqlTable Table;
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73 public ObjectMapper Mapper;
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74 }
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75
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76 class MetadataInfo
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77 {
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78 public MetadataInfo(MappingSchema mappingSchema)
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79 {
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80 _mappingSchema = mappingSchema;
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81 LoadMetadata();
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82 }
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83
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84 readonly MappingSchema _mappingSchema;
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85
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86 readonly public Dictionary<Type,TypeInfo> TypeDic = new Dictionary<Type,TypeInfo>();
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87 readonly public Dictionary<string,ResourceType> Types = new Dictionary<string,ResourceType>();
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88 readonly public Dictionary<string,ResourceSet> Sets = new Dictionary<string,ResourceSet>();
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89 readonly public Dictionary<string,Func<object,IQueryable>> RootGetters = new Dictionary<string,Func<object,IQueryable>>();
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90
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91 void LoadMetadata()
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92 {
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93 var n = 0;
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94 var list =
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95 (
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96 from p in typeof(T).GetProperties()
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97 let t = p.PropertyType
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98 where t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Table<>)
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99 let tt = t.GetGenericArguments()[0]
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100 let tbl = new SqlTable(_mappingSchema, tt)
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101 where tbl.Fields.Values.Any(f => f.IsPrimaryKey)
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102 let m = _mappingSchema.GetObjectMapper(tt)
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103 select new
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104 {
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105 p.Name,
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106 ID = n++,
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107 Type = tt,
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108 Table = tbl,
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109 Mapper = m
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110 }
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111 ).ToList();
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112
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113 var baseTypes = new Dictionary<Type,Type>();
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114
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115 foreach (var item in list)
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116 foreach (var m in item.Mapper.InheritanceMapping)
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117 if (!baseTypes.ContainsKey(m.Type))
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118 baseTypes.Add(m.Type, item.Type);
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119
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120 list.Sort((x,y) =>
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121 {
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122 Type baseType;
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123
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124 if (baseTypes.TryGetValue(x.Type, out baseType))
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125 if (y.Type == baseType)
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126 return 1;
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127
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128 if (baseTypes.TryGetValue(y.Type, out baseType))
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129 if (x.Type == baseType)
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130 return -1;
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131
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132 return x.ID - y.ID;
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133 });
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134
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135 foreach (var item in list)
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136 {
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137 Type baseType;
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138 baseTypes.TryGetValue(item.Type, out baseType);
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139
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140 var type = GetTypeInfo(item.Type, baseType, item.Table, item.Mapper);
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141 var set = new ResourceSet(item.Name, type.Type);
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142
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143 set.SetReadOnly();
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144
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145 Sets.Add(set.Name, set);
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146 }
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147
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148 foreach (var item in list)
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149 {
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150 foreach (var m in item.Mapper.InheritanceMapping)
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151 {
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152 if (!TypeDic.ContainsKey(m.Type))
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153 {
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154 GetTypeInfo(
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155 m.Type,
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156 item.Type,
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157 new SqlTable(_mappingSchema, item.Type),
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158 _mappingSchema.GetObjectMapper(item.Type));
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159 }
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160 }
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161 }
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162 }
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163
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164 TypeInfo GetTypeInfo(Type type, Type baseType, SqlTable table, ObjectMapper mapper)
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165 {
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166 TypeInfo typeInfo;
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167
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168 if (!TypeDic.TryGetValue(type, out typeInfo))
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169 {
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170 var baseInfo = baseType != null ? TypeDic[baseType] : null;
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171
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172 typeInfo = new TypeInfo
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173 {
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174 Type = new ResourceType(
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175 type,
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176 ResourceTypeKind.EntityType,
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177 baseInfo != null ? baseInfo.Type : null,
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178 type.Namespace,
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179 type.Name,
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180 type.IsAbstract),
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181 Table = table,
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182 Mapper = mapper,
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183 };
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184
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185 foreach (var field in table.Fields.Values)
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186 {
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187 if (baseType != null && baseInfo.Table.Fields.ContainsKey(field.Name))
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188 continue;
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189
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190 var kind = ResourcePropertyKind.Primitive;
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191 var ptype = ResourceType.GetPrimitiveResourceType(field.SystemType);
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192
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193 if (baseType == null && field.IsPrimaryKey)
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194 kind |= ResourcePropertyKind.Key;
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195
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196 var p = new ResourceProperty(field.Name, kind, ptype);
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197
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198 typeInfo.Type.AddProperty(p);
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199 }
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200
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201 typeInfo.Type.SetReadOnly();
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202
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203 Types. Add(typeInfo.Type.FullName, typeInfo.Type);
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204 TypeDic.Add(type, typeInfo);
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205 }
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206
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207 return typeInfo;
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208 }
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209
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210 public object CreateInstance(Type type)
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211 {
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212 return TypeDic[type].Mapper.CreateInstance();
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213 }
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214 }
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215
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216 #endregion
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217
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218 #region MetadataProvider
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219
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220 class MetadataProvider : IDataServiceMetadataProvider
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221 {
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222 public MetadataProvider(MetadataInfo data)
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223 {
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224 _data = data;
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225 }
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226
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227 readonly MetadataInfo _data;
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228
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229 public bool TryResolveResourceSet(string name, out ResourceSet resourceSet)
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230 {
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231 return _data.Sets.TryGetValue(name, out resourceSet);
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232 }
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233
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234 public ResourceAssociationSet GetResourceAssociationSet(ResourceSet resourceSet, ResourceType resourceType, ResourceProperty resourceProperty)
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235 {
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236 throw new InvalidOperationException();
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237 }
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238
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239 public bool TryResolveResourceType(string name, out ResourceType resourceType)
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240 {
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241 return _data.Types.TryGetValue(name, out resourceType);
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242 }
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243
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244 public IEnumerable<ResourceType> GetDerivedTypes(ResourceType resourceType)
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245 {
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246 return _data.TypeDic[resourceType.InstanceType].Mapper.InheritanceMapping.Select(m => _data.TypeDic[m.Type].Type);
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247 }
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248
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249 public bool HasDerivedTypes(ResourceType resourceType)
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250 {
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251 return _data.TypeDic[resourceType.InstanceType].Mapper.InheritanceMapping.Count > 0;
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252 }
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253
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254 public bool TryResolveServiceOperation(string name, out ServiceOperation serviceOperation)
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255 {
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256 serviceOperation = null;
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257 return false;
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258 }
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259
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260 public string ContainerNamespace { get { return typeof(T).Namespace; } }
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261 public string ContainerName { get { return typeof(T).Name; } }
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262 public IEnumerable<ResourceSet> ResourceSets { get { return _data.Sets.Values; } }
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263 public IEnumerable<ResourceType> Types { get { return _data.Types.Values; } }
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264 public IEnumerable<ServiceOperation> ServiceOperations { get { yield break; } }
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265 }
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266
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267 #endregion
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268
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269 #region QueryProvider
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270
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271 class QueryProvider : IDataServiceQueryProvider
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272 {
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273 public QueryProvider(MetadataInfo data)
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274 {
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275 _data = data;
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276 }
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277
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278 readonly MetadataInfo _data;
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279
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280 public IQueryable GetQueryRootForResourceSet(ResourceSet resourceSet)
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281 {
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282 Func<object,IQueryable> func;
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283
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284 lock (_data.RootGetters)
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285 {
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286 if (!_data.RootGetters.TryGetValue(resourceSet.Name, out func))
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287 {
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288 var p = Expression.Parameter(typeof(object), "p");
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289 var l = Expression.Lambda<Func<object,IQueryable>>(
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290 Expression.PropertyOrField(
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291 Expression.Convert(p, typeof(T)),
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292 resourceSet.Name),
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293 p);
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294
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295 func = l.Compile();
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296
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297 _data.RootGetters.Add(resourceSet.Name, func);
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298 }
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299 }
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300
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301 return func(CurrentDataSource);
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302 }
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303
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304 public ResourceType GetResourceType(object target)
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305 {
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306 return _data.TypeDic[target.GetType()].Type;
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307 }
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308
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309 public object GetPropertyValue(object target, ResourceProperty resourceProperty)
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310 {
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311 throw new InvalidOperationException();
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312 }
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313
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314 public object GetOpenPropertyValue(object target, string propertyName)
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315 {
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316 throw new InvalidOperationException();
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317 }
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318
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319 public IEnumerable<KeyValuePair<string,object>> GetOpenPropertyValues(object target)
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320 {
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321 throw new InvalidOperationException();
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322 }
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323
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324 public object InvokeServiceOperation(ServiceOperation serviceOperation, object[] parameters)
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325 {
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326 throw new InvalidOperationException();
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327 }
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328
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329 public object CurrentDataSource { get; set; }
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330 public bool IsNullPropagationRequired { get { return true; } }
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331 }
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332
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333 #endregion
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334
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335 #region UpdateProvider
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336
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337 abstract class ResourceAction
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338 {
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339 public object Resource;
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340
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341 public class Create : ResourceAction {}
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342 public class Delete : ResourceAction {}
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343 public class Reset : ResourceAction {}
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344
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345 public class Update : ResourceAction
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346 {
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347 public string Property;
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348 public object Value;
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349 }
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350
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351 }
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352
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353 class UpdateProvider : IDataServiceUpdateProvider
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354 {
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355 #region Init
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356
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357 public UpdateProvider(MetadataInfo data, MetadataProvider metadata, QueryProvider query)
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358 {
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359 _data = data;
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360 _metadata = metadata;
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361 _query = query;
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362 }
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363
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364 readonly MetadataInfo _data;
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365 readonly MetadataProvider _metadata;
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366 readonly QueryProvider _query;
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367 readonly List<ResourceAction> _actions = new List<ResourceAction>();
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368
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369 #endregion
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370
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371 #region IDataServiceUpdateProvider
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372
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373 public void SetConcurrencyValues(object resourceCookie, bool? checkForEquality, IEnumerable<KeyValuePair<string,object>> concurrencyValues)
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374 {
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375 throw new InvalidOperationException();
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376 }
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377
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378 public void AddReferenceToCollection(object targetResource, string propertyName, object resourceToBeAdded)
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379 {
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380 throw new InvalidOperationException();
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381 }
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382
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383 public void ClearChanges()
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384 {
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385 _actions.Clear();
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386 }
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387
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388 public object CreateResource(string containerName, string fullTypeName)
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389 {
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390 ResourceType type;
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391
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392 if (_metadata.TryResolveResourceType(fullTypeName, out type))
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393 {
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394 var resource = _data.CreateInstance(type.InstanceType);
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395 _actions.Add(new ResourceAction.Create { Resource = resource });
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396 return resource;
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397 }
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398
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399 throw new Exception(string.Format("Type '{0}' not found", fullTypeName));
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400 }
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401
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402 public void DeleteResource(object targetResource)
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403 {
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404 _actions.Add(new ResourceAction.Delete { Resource = targetResource });
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405 }
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406
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407 public object GetResource(IQueryable query, string fullTypeName)
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408 {
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409 object resource = null;
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410
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411 foreach (var item in query)
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412 {
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413 if (resource != null)
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414 throw new LinqException("Resource not uniquely identified");
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415 resource = item;
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416 }
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417
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418 return resource;
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419 }
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420
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421 public object GetValue(object targetResource, string propertyName)
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422 {
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423 var m = _data.TypeDic[targetResource.GetType()].Mapper;
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424 return m[propertyName, true].GetValue(targetResource);
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425 }
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426
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427 public void RemoveReferenceFromCollection(object targetResource, string propertyName, object resourceToBeRemoved)
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428 {
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429 throw new InvalidOperationException();
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430 }
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431
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432 public object ResetResource(object resource)
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433 {
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434 _actions.Add(new ResourceAction.Reset { Resource = resource });
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435 return resource;
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436 }
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437
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438 public object ResolveResource(object resource)
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439 {
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440 return resource;
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441 }
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442
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443 public void SaveChanges()
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444 {
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445 throw new InvalidOperationException();
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446 }
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447
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448 public void SetReference(object targetResource, string propertyName, object propertyValue)
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449 {
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450 throw new InvalidOperationException();
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451 }
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452
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453 public void SetValue(object targetResource, string propertyName, object propertyValue)
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454 {
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455 var m = _data.TypeDic[targetResource.GetType()].Mapper;
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456
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457 m[propertyName, true].SetValue(targetResource, propertyValue);
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458
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459 _actions.Add(new ResourceAction.Update { Resource = targetResource, Property = propertyName, Value = propertyValue });
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460 }
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461
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462 #endregion
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463 }
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464
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465 #endregion
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466 }
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467 }
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