1 | // Protocol Buffers - Google's data interchange format
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2 | // Copyright 2008 Google Inc. All rights reserved.
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3 | // http://github.com/jskeet/dotnet-protobufs/
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4 | // Original C++/Java/Python code:
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5 | // http://code.google.com/p/protobuf/
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6 | //
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7 | // Redistribution and use in source and binary forms, with or without
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8 | // modification, are permitted provided that the following conditions are
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9 | // met:
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10 | //
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11 | // * Redistributions of source code must retain the above copyright
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12 | // notice, this list of conditions and the following disclaimer.
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13 | // * Redistributions in binary form must reproduce the above
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14 | // copyright notice, this list of conditions and the following disclaimer
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15 | // in the documentation and/or other materials provided with the
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16 | // distribution.
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17 | // * Neither the name of Google Inc. nor the names of its
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18 | // contributors may be used to endorse or promote products derived from
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19 | // this software without specific prior written permission.
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20 | //
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21 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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22 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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23 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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24 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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25 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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26 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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27 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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28 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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29 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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30 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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31 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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32 | using System;
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33 | using Google.ProtocolBuffers.Descriptors;
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34 |
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35 | namespace Google.ProtocolBuffers.FieldAccess
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36 | {
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37 | /// <summary>
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38 | /// Provides access to fields in generated messages via reflection.
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39 | /// This type is public to allow it to be used by generated messages, which
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40 | /// create appropriate instances in the .proto file description class.
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41 | /// TODO(jonskeet): See if we can hide it somewhere...
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42 | /// </summary>
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43 | public sealed class FieldAccessorTable<TMessage, TBuilder>
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44 | where TMessage : IMessage<TMessage, TBuilder>
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45 | where TBuilder : IBuilder<TMessage, TBuilder>
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46 | {
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47 | private readonly IFieldAccessor<TMessage, TBuilder>[] accessors;
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48 |
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49 | private readonly MessageDescriptor descriptor;
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50 |
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51 | public MessageDescriptor Descriptor
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52 | {
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53 | get { return descriptor; }
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54 | }
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55 |
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56 | /// <summary>
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57 | /// Constructs a FieldAccessorTable for a particular message class.
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58 | /// Only one FieldAccessorTable should be constructed per class.
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59 | /// The property names should all actually correspond with the field descriptor's
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60 | /// CSharpOptions.PropertyName property, but bootstrapping issues currently
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61 | /// prevent us from using that. This may be addressed at a future time, in which case
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62 | /// we can keep this constructor for backwards compatibility, just ignoring the parameter.
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63 | /// TODO(jonskeet): Make it so.
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64 | /// </summary>
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65 | /// <param name="descriptor">The type's descriptor</param>
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66 | /// <param name="propertyNames">The Pascal-case names of all the field-based properties in the message.</param>
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67 | public FieldAccessorTable(MessageDescriptor descriptor, String[] propertyNames)
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68 | {
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69 | this.descriptor = descriptor;
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70 | accessors = new IFieldAccessor<TMessage, TBuilder>[descriptor.Fields.Count];
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71 | for (int i = 0; i < accessors.Length; i++)
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72 | {
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73 | accessors[i] = CreateAccessor(descriptor.Fields[i], propertyNames[i]);
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74 | }
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75 | }
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76 |
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77 | /// <summary>
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78 | /// Creates an accessor for a single field
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79 | /// </summary>
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80 | private static IFieldAccessor<TMessage, TBuilder> CreateAccessor(FieldDescriptor field, string name)
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81 | {
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82 | if (field.IsRepeated)
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83 | {
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84 | switch (field.MappedType)
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85 | {
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86 | case MappedType.Message:
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87 | return new RepeatedMessageAccessor<TMessage, TBuilder>(name);
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88 | case MappedType.Enum:
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89 | return new RepeatedEnumAccessor<TMessage, TBuilder>(field, name);
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90 | default:
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91 | return new RepeatedPrimitiveAccessor<TMessage, TBuilder>(name);
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92 | }
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93 | }
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94 | else
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95 | {
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96 | switch (field.MappedType)
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97 | {
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98 | case MappedType.Message:
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99 | return new SingleMessageAccessor<TMessage, TBuilder>(name);
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100 | case MappedType.Enum:
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101 | return new SingleEnumAccessor<TMessage, TBuilder>(field, name);
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102 | default:
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103 | return new SinglePrimitiveAccessor<TMessage, TBuilder>(name);
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104 | }
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105 | }
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106 | }
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107 |
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108 | internal IFieldAccessor<TMessage, TBuilder> this[FieldDescriptor field]
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109 | {
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110 | get
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111 | {
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112 | if (field.ContainingType != descriptor)
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113 | {
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114 | throw new ArgumentException("FieldDescriptor does not match message type.");
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115 | }
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116 | else if (field.IsExtension)
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117 | {
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118 | // If this type had extensions, it would subclass ExtendableMessage,
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119 | // which overrides the reflection interface to handle extensions.
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120 | throw new ArgumentException("This type does not have extensions.");
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121 | }
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122 | return accessors[field.Index];
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123 | }
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124 | }
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125 | }
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126 | } |
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