EventDefinition.cs

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using System.Collections.Immutable;
 
namespace System.Reflection.Metadata;
 
public readonly struct EventDefinition
{
    private readonly MetadataReader _reader;
 
    private readonly int _rowId;
 
    private EventDefinitionHandle Handle => EventDefinitionHandle.FromRowId(_rowId);
 
    public StringHandle Name => _reader.EventTable.GetName(Handle);
 
    public EventAttributes Attributes => _reader.EventTable.GetFlags(Handle);
 
    public EntityHandle Type => _reader.EventTable.GetEventType(Handle);
 
    internal EventDefinition(MetadataReader reader, EventDefinitionHandle handle)
    {
        _reader = reader;
        _rowId = handle.RowId;
    }
 
    public CustomAttributeHandleCollection GetCustomAttributes()
    {
        return new CustomAttributeHandleCollection(_reader, Handle);
    }
 
    public EventAccessors GetAccessors()
    {
        int adderRowId = 0;
        int removerRowId = 0;
        int raiserRowId = 0;
        ImmutableArray<MethodDefinitionHandle>.Builder builder = null;
        ushort methodCount;
        int num = _reader.MethodSemanticsTable.FindSemanticMethodsForEvent(Handle, out methodCount);
        for (ushort num2 = 0; num2 < methodCount; num2++)
        {
            int rowId = num + num2;
            switch (_reader.MethodSemanticsTable.GetSemantics(rowId))
            {
            case MethodSemanticsAttributes.Adder:
                adderRowId = _reader.MethodSemanticsTable.GetMethod(rowId).RowId;
                break;
            case MethodSemanticsAttributes.Remover:
                removerRowId = _reader.MethodSemanticsTable.GetMethod(rowId).RowId;
                break;
            case MethodSemanticsAttributes.Raiser:
                raiserRowId = _reader.MethodSemanticsTable.GetMethod(rowId).RowId;
                break;
            case MethodSemanticsAttributes.Other:
                if (builder == null)
                {
                    builder = ImmutableArray.CreateBuilder<MethodDefinitionHandle>();
                }
                builder.Add(_reader.MethodSemanticsTable.GetMethod(rowId));
                break;
            }
        }
        ImmutableArray<MethodDefinitionHandle> others = builder?.ToImmutable() ?? ImmutableArray<MethodDefinitionHandle>.Empty;
        return new EventAccessors(adderRowId, removerRowId, raiserRowId, others);
    }
}