1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 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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23 | using System.Reflection;
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24 | using HeuristicLab.Persistence.Core;
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25 |
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26 | namespace HeuristicLab.Persistence.Core {
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27 |
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28 | /// <summary>
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29 | /// Encapsulation and abstraction for access a data member of an object
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30 | /// regardless of it being a property or field. Additionally a
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31 | /// default value and an alternate name can be specified.
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32 | /// </summary>
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33 | public class DataMemberAccessor {
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34 |
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35 | /// <summary>
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36 | /// The function to get the value of the data member.
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37 | /// </summary>
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38 | public readonly Func<object> Get;
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39 |
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40 | /// <summary>
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41 | /// The function to set the value of the data member.
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42 | /// </summary>
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43 | public readonly Action<object> Set;
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44 |
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45 | /// <summary>
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46 | /// The name of the data member.
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47 | /// </summary>
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48 | public readonly string Name;
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49 |
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50 | /// <summary>
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51 | /// The default value of the data member, can remain <c>null</c>
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52 | /// if no default value. If left null, this will also leave the
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53 | /// default value for value types (e.g. 0 for <c>int</c>).
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54 | /// </summary>
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55 | public readonly object DefaultValue;
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56 |
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57 |
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58 | /// <summary>
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59 | /// Create a <see cref="DataMemberAccessor"/> from a FieldInfo or
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60 | /// PropertyInfo for the give object.
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61 | /// </summary>
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62 | /// <param name="memberInfo">The member info.</param>
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63 | /// <param name="name">The name.</param>
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64 | /// <param name="defaultvalue">The defaultvalue.</param>
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65 | /// <param name="obj">The object.</param>
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66 | public DataMemberAccessor(MemberInfo memberInfo, string name, object defaultvalue, object obj) {
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67 | Name = name;
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68 | DefaultValue = defaultvalue;
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69 | if (memberInfo.MemberType == MemberTypes.Field) {
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70 | FieldInfo fieldInfo = (FieldInfo)memberInfo;
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71 | Get = () => fieldInfo.GetValue(obj);
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72 | Set = value => fieldInfo.SetValue(obj, value);
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73 | } else if (memberInfo.MemberType == MemberTypes.Property) {
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74 | PropertyInfo propertyInfo = (PropertyInfo)memberInfo;
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75 | if (!propertyInfo.CanRead || !propertyInfo.CanWrite) {
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76 | throw new PersistenceException(
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77 | "Storable properties must implement both a Get and a Set Accessor. ");
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78 | }
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79 | Get = () => propertyInfo.GetValue(obj, null);
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80 | Set = value => propertyInfo.SetValue(obj, value, null);
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81 | } else {
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82 | throw new PersistenceException(
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83 | "The Storable attribute can only be applied to fields and properties.");
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84 | }
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85 | }
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86 |
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87 | /// <summary>
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88 | /// Wrap existing getter and setter functions.
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89 | /// </summary>
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90 | /// <param name="name">The name.</param>
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91 | /// <param name="defaultValue">The default value.</param>
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92 | /// <param name="getter">The getter.</param>
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93 | /// <param name="setter">The setter.</param>
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94 | public DataMemberAccessor(string name, object defaultValue,
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95 | Func<object> getter, Action<object> setter) {
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96 | Name = name;
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97 | DefaultValue = defaultValue;
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98 | Get = getter;
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99 | Set = setter;
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100 | }
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101 |
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102 | /// <summary>
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103 | /// Create an empty accessor that just encapsulates an object
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104 | /// without access.
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105 | /// </summary>
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106 | /// <param name="o">The object</param>
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107 | public DataMemberAccessor(object o) {
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108 | Name = null;
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109 | DefaultValue = null;
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110 | Get = () => o;
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111 | Set = null;
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112 | }
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113 |
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114 | /// <summary>
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115 | /// Create an empty accessor that just encapsulates an object
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116 | /// without access.
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117 | /// </summary>
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118 | /// <param name="o">The object</param>
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119 | /// <param name="name">The object's name.</param>
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120 | public DataMemberAccessor(object o, string name) {
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121 | Name = name;
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122 | DefaultValue = null;
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123 | Get = () => o;
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124 | Set = null;
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125 | }
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126 |
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127 | /// <summary>
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128 | /// Returns a <see cref="System.String"/> that represents this instance.
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129 | /// </summary>
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130 | /// <returns>
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131 | /// A <see cref="System.String"/> that represents this instance.
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132 | /// </returns>
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133 | public override string ToString() {
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134 | return String.Format("DataMemberAccessor({0}, {1}, {2}, {3})",
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135 | Name,
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136 | DefaultValue ?? "<null>",
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137 | Get.Method, Set.Method);
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138 | }
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139 | }
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140 |
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141 | } |
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