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Add TryGetExtension API (with TryGetOption) #7282

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Add TryGetExtension API (with TryGetOption) #7282

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6 changes: 6 additions & 0 deletions csharp/src/Google.Protobuf.Test.TestProtos/TestMessagesProto2.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3901,6 +3901,9 @@ public enum OneofFieldOneofCase {
public TValue GetExtension<TValue>(pb::Extension<TestAllTypesProto2, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestAllTypesProto2,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestAllTypesProto2, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -4435,6 +4438,9 @@ public sealed partial class MessageSetCorrect : pb::IExtendableMessage<MessageSe
public TValue GetExtension<TValue>(pb::Extension<MessageSetCorrect, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<MessageSetCorrect,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<MessageSetCorrect, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down
32 changes: 31 additions & 1 deletion csharp/src/Google.Protobuf.Test.TestProtos/Unittest.cs
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Expand Up @@ -4314,7 +4314,7 @@ public sealed partial class RepeatedGroup : pb::IMessage<RepeatedGroup> {
}

/// <summary>
/// This proto includes a recusively nested message.
/// This proto includes a recursively nested message.
/// </summary>
public sealed partial class NestedTestAllTypes : pb::IMessage<NestedTestAllTypes> {
private static readonly pb::MessageParser<NestedTestAllTypes> _parser = new pb::MessageParser<NestedTestAllTypes>(() => new NestedTestAllTypes());
Expand Down Expand Up @@ -5255,6 +5255,9 @@ public sealed partial class TestAllExtensions : pb::IExtendableMessage<TestAllEx
public TValue GetExtension<TValue>(pb::Extension<TestAllExtensions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestAllExtensions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestAllExtensions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -6030,6 +6033,9 @@ public sealed partial class TestGroupExtension : pb::IExtendableMessage<TestGrou
public TValue GetExtension<TValue>(pb::Extension<TestGroupExtension, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestGroupExtension,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestGroupExtension, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -8601,6 +8607,9 @@ public sealed partial class TestEmptyMessageWithExtensions : pb::IExtendableMess
public TValue GetExtension<TValue>(pb::Extension<TestEmptyMessageWithExtensions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestEmptyMessageWithExtensions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestEmptyMessageWithExtensions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -8742,6 +8751,9 @@ public sealed partial class TestMultipleExtensionRanges : pb::IExtendableMessage
public TValue GetExtension<TValue>(pb::Extension<TestMultipleExtensionRanges, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestMultipleExtensionRanges,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestMultipleExtensionRanges, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -12220,6 +12232,9 @@ public sealed partial class TestFieldOrderings : pb::IExtendableMessage<TestFiel
public TValue GetExtension<TValue>(pb::Extension<TestFieldOrderings, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestFieldOrderings,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestFieldOrderings, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -19366,6 +19381,9 @@ public sealed partial class TestPackedExtensions : pb::IExtendableMessage<TestPa
public TValue GetExtension<TValue>(pb::Extension<TestPackedExtensions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestPackedExtensions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestPackedExtensions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -19507,6 +19525,9 @@ public sealed partial class TestUnpackedExtensions : pb::IExtendableMessage<Test
public TValue GetExtension<TValue>(pb::Extension<TestUnpackedExtensions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestUnpackedExtensions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestUnpackedExtensions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -20583,6 +20604,9 @@ public sealed partial class TestParsingMerge : pb::IExtendableMessage<TestParsin
public TValue GetExtension<TValue>(pb::Extension<TestParsingMerge, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestParsingMerge,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestParsingMerge, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -23248,6 +23272,9 @@ public enum OneofFieldOneofCase {
public TValue GetExtension<TValue>(pb::Extension<TestHugeFieldNumbers, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestHugeFieldNumbers,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestHugeFieldNumbers, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -23913,6 +23940,9 @@ public sealed partial class TestExtensionInsideTable : pb::IExtendableMessage<Te
public TValue GetExtension<TValue>(pb::Extension<TestExtensionInsideTable, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<TestExtensionInsideTable,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<TestExtensionInsideTable, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down
21 changes: 21 additions & 0 deletions csharp/src/Google.Protobuf.Test/GeneratedMessageTest.Proto2.cs
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Expand Up @@ -204,6 +204,27 @@ public void DefaultExtensionValues()
Assert.False(message.HasExtension(DefaultStringPieceExtension));
Assert.False(message.HasExtension(DefaultUint32Extension));
Assert.False(message.HasExtension(DefaultUint64Extension));

Assert.False(message.TryGetExtension(DefaultBoolExtension, out _));
Assert.False(message.TryGetExtension(DefaultBytesExtension, out _));
Assert.False(message.TryGetExtension(DefaultCordExtension, out _));
Assert.False(message.TryGetExtension(DefaultDoubleExtension, out _));
Assert.False(message.TryGetExtension(DefaultFixed32Extension, out _));
Assert.False(message.TryGetExtension(DefaultFixed64Extension, out _));
Assert.False(message.TryGetExtension(DefaultFloatExtension, out _));
Assert.False(message.TryGetExtension(DefaultForeignEnumExtension, out _));
Assert.False(message.TryGetExtension(DefaultImportEnumExtension, out _));
Assert.False(message.TryGetExtension(DefaultInt32Extension, out _));
Assert.False(message.TryGetExtension(DefaultInt64Extension, out _));
Assert.False(message.TryGetExtension(DefaultNestedEnumExtension, out _));
Assert.False(message.TryGetExtension(DefaultSfixed32Extension, out _));
Assert.False(message.TryGetExtension(DefaultSfixed64Extension, out _));
Assert.False(message.TryGetExtension(DefaultSint32Extension, out _));
Assert.False(message.TryGetExtension(DefaultSint64Extension, out _));
Assert.False(message.TryGetExtension(DefaultStringExtension, out _));
Assert.False(message.TryGetExtension(DefaultStringPieceExtension, out _));
Assert.False(message.TryGetExtension(DefaultUint32Extension, out _));
Assert.False(message.TryGetExtension(DefaultUint64Extension, out _));
}

[Test]
Expand Down
Binary file modified csharp/src/Google.Protobuf.Test/testprotos.pb
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16 changes: 16 additions & 0 deletions csharp/src/Google.Protobuf/ExtensionSet.cs
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Expand Up @@ -70,6 +70,22 @@ public static class ExtensionSet
}
}

/// Gets the value of the specified extension if it's set.
public static bool TryGet<TTarget, TValue>(ref ExtensionSet<TTarget> set, Extension<TTarget, TValue> extension, out TValue value) where TTarget : IExtendableMessage<TTarget>
{
IExtensionValue extensionValue;
if (TryGetValue(ref set, extension, out extensionValue))
{
value = ((ExtensionValue<TValue>)extensionValue).GetValue();
return true;
}
else
{
value = default(TValue);
return false;
}
}

/// <summary>
/// Gets the value of the specified repeated extension or null if it doesn't exist in this set
/// </summary>
Expand Down
6 changes: 6 additions & 0 deletions csharp/src/Google.Protobuf/IExtendableMessage.cs
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Expand Up @@ -45,6 +45,12 @@ public interface IExtendableMessage<T> : IMessage<T> where T : IExtendableMessag
/// </summary>
TValue GetExtension<TValue>(Extension<T, TValue> extension);

/// <summary>
/// Gets the value of the specified extension.
/// Unlike <see cref="IExtendableMessage{T}.GetExtension{TValue}(Extension{T, TValue})"/>, this doesn't return the default value for the extension if it's not set.
/// </summary>
bool TryGetExtension<TValue>(Extension<T, TValue> extension, out TValue value);
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It looks like the GetExtension method was a mistake from the very beginning, since it doesn't allow simple handling of the case where the extension is not present (which is a very common case in practice).

The problem seems to be that ExtensionSet.Get returns default(T) if the value is not found, which makes it impossible to distinguish the case where extension is not present at all vs where extension is present, but is set to the default value. (e.g for int, bool, float, etc..)

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The problem seems to be that ExtensionSet.Get returns default(T) if the value is not found,

It returns the default value of the field which I believe matches up with get methods in other implementations.

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Can you provide and example how this is handled e.g. in java?
How can I distinguish between the extension value not being present at all from extension value being present, but set to its default value? Unless I'm missing something, it really feels that the API should allow you to do that. (does e.g. java allow that?).

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// in file scope
optional int32 bar = 99999 [default = 3];
// default
int value = msg.getExtension(FooFile.Bar); // 3

msg.setExtension(FooFile.Bar, 3);
if (msg.hasExtension(FooFile.Bar)) { // true
    value = msg.getExtension(FooFile.Bar); // 3
}

Custom options don't work the same way for us since java has builders and readers so they can just return the descriptor options reader and get the same API. We could add a HasOption API, but TryGet fixes the need for that.

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Thanks. Ok so to me it looks like we basically have two ways of handling this:

  • introduce TryGetExtension method, at which point GetOption becomes pretty much useless (because it can return default value for an extension that isn't present, which seems semantically wrong), but the issue is we already have introduced GetExtension, so getting rid of it shortly after introducing is odd.

  • we can keep GetExtension (because it already exists) and introduce a new HasExtension method which allows checking whether the value is present or not. If GetExtension() is called for a value that is not present, we can throw / return the default value (what the is getExtension method's behavior in java?).

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getExtension returns the default value.

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Ok, I didn't notice that we already have a "HasExtension" method so my last comment is partially wrong.
Because we already have the HasExtension/GetExtension pair, I don't think we need TryGetExtension at all (why increase the API surface if all the necessary functionality is already there?).

In terms of options, I think both GetOption and TryGetOption are unnecessary and we should get rid of them. See my PR: #7434


/// <summary>
/// Gets the value of the specified repeated extension or null if the extension isn't registered in this set.
/// For a version of this method that never returns null, use <see cref="IExtendableMessage{T}.GetOrInitializeExtension{TValue}(RepeatedExtension{T, TValue})"/>
Expand Down
27 changes: 27 additions & 0 deletions csharp/src/Google.Protobuf/Reflection/Descriptor.cs
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Expand Up @@ -1730,6 +1730,9 @@ public sealed partial class ExtensionRangeOptions : pb::IExtendableMessage<Exten
public TValue GetExtension<TValue>(pb::Extension<ExtensionRangeOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<ExtensionRangeOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<ExtensionRangeOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -4868,6 +4871,9 @@ public sealed partial class FileOptions : pb::IExtendableMessage<FileOptions> {
public TValue GetExtension<TValue>(pb::Extension<FileOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<FileOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<FileOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -5277,6 +5283,9 @@ public sealed partial class MessageOptions : pb::IExtendableMessage<MessageOptio
public TValue GetExtension<TValue>(pb::Extension<MessageOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<MessageOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<MessageOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -5753,6 +5762,9 @@ public sealed partial class FieldOptions : pb::IExtendableMessage<FieldOptions>
public TValue GetExtension<TValue>(pb::Extension<FieldOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<FieldOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<FieldOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -5948,6 +5960,9 @@ public sealed partial class OneofOptions : pb::IExtendableMessage<OneofOptions>
public TValue GetExtension<TValue>(pb::Extension<OneofOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<OneofOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<OneofOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -6206,6 +6221,9 @@ public sealed partial class EnumOptions : pb::IExtendableMessage<EnumOptions> {
public TValue GetExtension<TValue>(pb::Extension<EnumOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<EnumOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<EnumOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -6419,6 +6437,9 @@ public sealed partial class EnumValueOptions : pb::IExtendableMessage<EnumValueO
public TValue GetExtension<TValue>(pb::Extension<EnumValueOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<EnumValueOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<EnumValueOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -6632,6 +6653,9 @@ public sealed partial class ServiceOptions : pb::IExtendableMessage<ServiceOptio
public TValue GetExtension<TValue>(pb::Extension<ServiceOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<ServiceOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<ServiceOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down Expand Up @@ -6886,6 +6910,9 @@ public sealed partial class MethodOptions : pb::IExtendableMessage<MethodOptions
public TValue GetExtension<TValue>(pb::Extension<MethodOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
public bool TryGetExtension<TValue>(pb::Extension<MethodOptions,TValue> extension, out TValue value) {
return pb::ExtensionSet.TryGet(ref _extensions, extension, out value);
}
public pbc::RepeatedField<TValue> GetExtension<TValue>(pb::RepeatedExtension<MethodOptions, TValue> extension) {
return pb::ExtensionSet.Get(ref _extensions, extension);
}
Expand Down
18 changes: 18 additions & 0 deletions csharp/src/Google.Protobuf/Reflection/EnumDescriptor.cs
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Expand Up @@ -140,6 +140,24 @@ public T GetOption<T>(Extension<EnumOptions, T> extension)
return value is IDeepCloneable<T> ? (value as IDeepCloneable<T>).Clone() : value;
}

/// <summary>
/// Gets a single value enum option for this descriptor
/// </summary>
public bool TryGetOption<T>(Extension<EnumOptions, T> extension, out T value)
{
T temp;
if (Proto.HasOptions && Proto.Options.TryGetExtension(extension, out temp))
{
value = temp is IDeepCloneable<T> ? (temp as IDeepCloneable<T>).Clone() : temp;
return true;
}
else
{
value = default(T);
return false;
}
}

/// <summary>
/// Gets a repeated value enum option for this descriptor
/// </summary>
Expand Down
18 changes: 18 additions & 0 deletions csharp/src/Google.Protobuf/Reflection/EnumValueDescriptor.cs
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Expand Up @@ -85,6 +85,24 @@ public T GetOption<T>(Extension<EnumValueOptions, T> extension)
return value is IDeepCloneable<T> ? (value as IDeepCloneable<T>).Clone() : value;
}

/// <summary>
/// Gets a single value enum value option for this descriptor
/// </summary>
public bool TryGetOption<T>(Extension<EnumValueOptions, T> extension, out T value)
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Adding this method is basically just duplicating the Extension API and we should avoid that.
See #7434 and let me know what you think.

{
T temp;
if (Proto.HasOptions && Proto.Options.TryGetExtension(extension, out temp))
{
value = temp is IDeepCloneable<T> ? (temp as IDeepCloneable<T>).Clone() : temp;
return true;
}
else
{
value = default(T);
return false;
}
}

/// <summary>
/// Gets a repeated value enum value option for this descriptor
/// </summary>
Expand Down