5 // Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
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7 // Permission is hereby granted, free of charge, to any person obtaining a copy
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8 // of this software and associated documentation files (the "Software"), to deal
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9 // in the Software without restriction, including without limitation the rights
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10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 // copies of the Software, and to permit persons to whom the Software is
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12 // furnished to do so, subject to the following conditions:
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14 // The above copyright notice and this permission notice shall be included in
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15 // all copies or substantial portions of the Software.
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17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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28 using System.Reflection;
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29 using System.Collections.Generic;
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30 using DbLinq.Data.Linq.Identity;
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34 using System.Data.Linq;
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36 using DbLinq.Data.Linq;
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39 namespace DbLinq.Data.Linq.Identity.Implementation
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42 /// IIdentityReader default implementation
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43 /// Currently uses reflection
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44 /// TODO: use compilation
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46 internal class IdentityReader : IIdentityReader
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48 private readonly Type type;
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49 private readonly IList<MemberInfo> keyMembers = new List<MemberInfo>();
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52 /// Gets an object identity
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54 /// <param name="entity"></param>
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55 /// <returns></returns>
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56 public IdentityKey GetIdentityKey(object entity)
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58 // no PK? --> null as identity (==we can not collect it)
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59 if (keyMembers.Count == 0)
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61 var keys = new List<object>();
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62 foreach (var keyMember in keyMembers)
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64 var key = keyMember.GetMemberValue(entity);
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68 return new IdentityKey(type, keys);
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72 /// Initializes a new instance of the <see cref="IdentityReader"/> class.
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74 /// <param name="t">The t.</param>
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75 /// <param name="dataContext">The data context.</param>
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76 public IdentityReader(Type t, DataContext dataContext)
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78 foreach (var member in dataContext.Mapping.GetTable(t).RowType.IdentityMembers)
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79 keyMembers.Add(member.Member);
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