[3743] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[9456] | 3 | * Copyright (C) 2002-2013 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[3743] | 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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[3031] | 23 | using System.Reflection;
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[3913] | 24 | using System.Reflection.Emit;
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[3031] | 25 |
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| 26 | namespace HeuristicLab.Persistence.Core {
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[4068] | 27 |
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[3031] | 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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[3913] | 33 | public sealed class DataMemberAccessor {
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[3031] | 34 |
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[3913] | 35 | #region fields
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| 36 |
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[3031] | 37 | /// <summary>
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| 38 | /// The function to get the value of the data member.
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| 39 | /// </summary>
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[3913] | 40 | public readonly Func<object, object> Get;
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[3031] | 41 |
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| 42 | /// <summary>
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| 43 | /// The function to set the value of the data member.
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| 44 | /// </summary>
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[3913] | 45 | public readonly Action<object, object> Set;
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[3031] | 46 |
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| 47 | /// <summary>
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| 48 | /// The name of the data member.
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| 49 | /// </summary>
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| 50 | public readonly string Name;
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| 51 |
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| 52 | /// <summary>
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| 53 | /// The default value of the data member, can remain <c>null</c>
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| 54 | /// if no default value. If left null, this will also leave the
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| 55 | /// default value for value types (e.g. 0 for <c>int</c>).
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| 56 | /// </summary>
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| 57 | public readonly object DefaultValue;
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| 58 |
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[3913] | 59 | #endregion
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[3031] | 60 |
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[3913] | 61 | #region constructors
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| 62 |
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[3031] | 63 | /// <summary>
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| 64 | /// Create a <see cref="DataMemberAccessor"/> from a FieldInfo or
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| 65 | /// PropertyInfo for the give object.
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| 66 | /// </summary>
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| 67 | /// <param name="memberInfo">The member info.</param>
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| 68 | /// <param name="name">The name.</param>
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| 69 | /// <param name="defaultvalue">The defaultvalue.</param>
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[3913] | 70 | public DataMemberAccessor(MemberInfo memberInfo, string name, object defaultvalue) {
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| 71 | Get = GenerateGetter(memberInfo);
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| 72 | Set = GenerateSetter(memberInfo);
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[3031] | 73 | Name = name;
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| 74 | DefaultValue = defaultvalue;
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| 75 | }
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| 76 |
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| 77 | /// <summary>
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| 78 | /// Create an empty accessor that just encapsulates an object
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| 79 | /// without access.
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[3913] | 80 | /// </summary>
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| 81 | public DataMemberAccessor() {
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[3031] | 82 | Name = null;
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| 83 | DefaultValue = null;
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[3913] | 84 | Get = Id;
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[3031] | 85 | }
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| 86 |
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| 87 | /// <summary>
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| 88 | /// Create an empty accessor that just encapsulates an object
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| 89 | /// without access.
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[3913] | 90 | /// </summary>
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[3031] | 91 | /// <param name="name">The object's name.</param>
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[3913] | 92 | public DataMemberAccessor(string name) {
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[3031] | 93 | Name = name;
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| 94 | DefaultValue = null;
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[3913] | 95 | Get = Id;
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[3031] | 96 | }
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| 97 |
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| 98 | /// <summary>
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[3913] | 99 | /// Initializes a new instance of the <see cref="DataMemberAccessor"/> class using the
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| 100 | /// getter and setter from an exisiting instance but with a new name and default value.
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| 101 | /// </summary>
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| 102 | /// <param name="dma">The existing DataMemberAccessor.</param>
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| 103 | /// <param name="name">The new name.</param>
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| 104 | /// <param name="defaultValue">The new default value.</param>
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| 105 | public DataMemberAccessor(DataMemberAccessor dma, string name, object defaultValue) {
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| 106 | Get = dma.Get;
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| 107 | Set = dma.Set;
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| 108 | this.Name = name;
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| 109 | this.DefaultValue = defaultValue;
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| 110 | }
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| 111 |
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| 112 | #endregion
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| 113 |
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| 114 | #region auxiliary methods
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| 115 |
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| 116 | /// <summary>
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[3031] | 117 | /// Returns a <see cref="System.String"/> that represents this instance.
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| 118 | /// </summary>
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| 119 | /// <returns>
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| 120 | /// A <see cref="System.String"/> that represents this instance.
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| 121 | /// </returns>
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| 122 | public override string ToString() {
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| 123 | return String.Format("DataMemberAccessor({0}, {1}, {2}, {3})",
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| 124 | Name,
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| 125 | DefaultValue ?? "<null>",
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| 126 | Get.Method, Set.Method);
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| 127 | }
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[3913] | 128 |
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| 129 | /// <summary>
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| 130 | /// The identity function
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| 131 | /// </summary>
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| 132 | /// <param name="o">An object.</param>
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| 133 | /// <returns>its argument o unmodified.</returns>
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| 134 | public static object Id(object o) {
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| 135 | return o;
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| 136 | }
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| 137 |
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| 138 | #endregion
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| 139 |
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| 140 | #region static methods (code generators)
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| 141 |
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| 142 | /// <summary>
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| 143 | /// Generate a getter for the given field or property
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| 144 | /// </summary>
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| 145 | /// <param name="memberInfo">The member info.</param>
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| 146 | /// <returns></returns>
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| 147 | public static Func<object, object> GenerateGetter(MemberInfo memberInfo) {
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| 148 | if (memberInfo.MemberType == MemberTypes.Field) {
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| 149 | FieldInfo fieldInfo = (FieldInfo)memberInfo;
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| 150 | return GenerateFieldGetter(fieldInfo);
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| 151 | } else if (memberInfo.MemberType == MemberTypes.Property) {
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[5324] | 152 | return GeneratePropertyGetter((PropertyInfo)memberInfo);
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[3913] | 153 | } else {
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| 154 | throw new PersistenceException(
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| 155 | "The Storable attribute can only be applied to fields and properties.");
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| 156 | }
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| 157 | }
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| 158 |
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| 159 | /// <summary>
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| 160 | /// Generates a setter for the given field or property.
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| 161 | /// </summary>
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| 162 | /// <param name="memberInfo">The member info.</param>
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| 163 | /// <returns></returns>
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| 164 | public static Action<object, object> GenerateSetter(MemberInfo memberInfo) {
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| 165 | if (memberInfo.MemberType == MemberTypes.Field) {
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| 166 | FieldInfo fieldInfo = (FieldInfo)memberInfo;
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| 167 | return GenerateFieldSetter(fieldInfo);
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| 168 | } else if (memberInfo.MemberType == MemberTypes.Property) {
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[5324] | 169 | return GeneratePropertySetter((PropertyInfo)memberInfo);
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[3913] | 170 | } else {
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| 171 | throw new PersistenceException(
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| 172 | "The Storable attribute can only be applied to fields and properties.");
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| 173 | }
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| 174 | }
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| 175 |
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| 176 | /// <summary>
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| 177 | /// Generates a dynamically compiled getter to access fields (even private ones).
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| 178 | /// </summary>
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| 179 | /// <param name="fieldInfo">The field info.</param>
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| 180 | /// <returns>A Func<object, object></returns>
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| 181 | public static Func<object, object> GenerateFieldGetter(FieldInfo fieldInfo) {
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| 182 | DynamicMethod dm = new DynamicMethod("", typeof(object), new Type[] { typeof(object) }, fieldInfo.DeclaringType, true);
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| 183 | ILGenerator ilgen = dm.GetILGenerator();
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| 184 | ilgen.Emit(OpCodes.Ldarg_0);
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| 185 | ilgen.Emit(OpCodes.Castclass, fieldInfo.DeclaringType);
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| 186 | ilgen.Emit(OpCodes.Ldfld, fieldInfo);
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| 187 | ilgen.Emit(OpCodes.Box, fieldInfo.FieldType);
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| 188 | ilgen.Emit(OpCodes.Ret);
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| 189 | return (Func<object, object>)dm.CreateDelegate(typeof(Func<object, object>));
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| 190 | }
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| 191 |
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| 192 | /// <summary>
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[5324] | 193 | /// Generates a dynamically compiled setter to access fields (even private ones).
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[3913] | 194 | /// </summary>
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| 195 | /// <param name="fieldInfo">The field info.</param>
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| 196 | /// <returns>An Action<object, object%gt;</returns>
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| 197 | public static Action<object, object> GenerateFieldSetter(FieldInfo fieldInfo) {
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| 198 | DynamicMethod dm = new DynamicMethod("", null, new Type[] { typeof(object), typeof(object) }, fieldInfo.DeclaringType, true);
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| 199 | ILGenerator ilgen = dm.GetILGenerator();
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| 200 | ilgen.Emit(OpCodes.Ldarg_0);
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| 201 | ilgen.Emit(OpCodes.Castclass, fieldInfo.DeclaringType);
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| 202 | ilgen.Emit(OpCodes.Ldarg_1);
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| 203 | ilgen.Emit(OpCodes.Unbox_Any, fieldInfo.FieldType);
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| 204 | ilgen.Emit(OpCodes.Stfld, fieldInfo);
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| 205 | ilgen.Emit(OpCodes.Ret);
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| 206 | return (Action<object, object>)dm.CreateDelegate(typeof(Action<object, object>));
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| 207 | }
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| 208 |
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| 209 | /// <summary>
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| 210 | /// Generates a dynamically compiled getter to access properties (even private ones).
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| 211 | /// </summary>
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| 212 | /// <param name="propertyInfo">The property info.</param>
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| 213 | /// <returns>A Func<object, object></returns>
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| 214 | public static Func<object, object> GeneratePropertyGetter(PropertyInfo propertyInfo) {
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[5324] | 215 | MethodInfo getter = propertyInfo.GetGetMethod(true);
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| 216 | if (getter == null)
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| 217 | return null;
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[3913] | 218 | DynamicMethod dm = new DynamicMethod("", typeof(object), new Type[] { typeof(object) }, propertyInfo.DeclaringType, true);
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| 219 | ILGenerator ilgen = dm.GetILGenerator();
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| 220 | ilgen.Emit(OpCodes.Ldarg_0);
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| 221 | ilgen.Emit(OpCodes.Castclass, propertyInfo.DeclaringType);
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[5324] | 222 | ilgen.Emit(OpCodes.Callvirt, getter);
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[3913] | 223 | ilgen.Emit(OpCodes.Box, propertyInfo.PropertyType);
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| 224 | ilgen.Emit(OpCodes.Ret);
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| 225 | return (Func<object, object>)dm.CreateDelegate(typeof(Func<object, object>));
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| 226 | }
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| 227 |
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| 228 | /// <summary>
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| 229 | /// Generates a dynamically compiled setter to access properties (even private ones).
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| 230 | /// </summary>
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| 231 | /// <param name="propertyInfo">The property info.</param>
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| 232 | /// <returns>An Action<object, object%gt;</returns>
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| 233 | public static Action<object, object> GeneratePropertySetter(PropertyInfo propertyInfo) {
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[5324] | 234 | MethodInfo setter = propertyInfo.GetSetMethod(true);
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| 235 | if (setter == null)
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| 236 | return null;
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[3913] | 237 | DynamicMethod dm = new DynamicMethod("", null, new Type[] { typeof(object), typeof(object) }, propertyInfo.DeclaringType, true);
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| 238 | ILGenerator ilgen = dm.GetILGenerator();
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| 239 | ilgen.Emit(OpCodes.Ldarg_0);
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| 240 | ilgen.Emit(OpCodes.Castclass, propertyInfo.DeclaringType);
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| 241 | ilgen.Emit(OpCodes.Ldarg_1);
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| 242 | ilgen.Emit(OpCodes.Unbox_Any, propertyInfo.PropertyType);
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[5324] | 243 | ilgen.Emit(OpCodes.Callvirt, setter);
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[3913] | 244 | ilgen.Emit(OpCodes.Ret);
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| 245 | return (Action<object, object>)dm.CreateDelegate(typeof(Action<object, object>));
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| 246 | }
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| 247 |
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| 248 | #endregion
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[3031] | 249 | }
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| 250 |
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| 251 | } |
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