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TemplateFactory.cs
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TemplateFactory.cs
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using System;
using System.Reflection;
using Cuemon.Reflection;
namespace Cuemon
{
/// <summary>
/// Provides a base-class for delegate based factories.
/// </summary>
/// <typeparam name="TTuple">The type of the n-tuple representation of a <see cref="Template"/>.</typeparam>
public abstract class TemplateFactory<TTuple> where TTuple : Template
{
/// <summary>
/// Initializes a new instance of the <see cref="TemplateFactory{T}"/> class.
/// </summary>
/// <param name="tuple">Then-tuple representation of a <see cref="Template"/>.</param>
/// <param name="hasDelegate"><c>true</c> if this instance has a valid delegate; otherwise, <c>false</c>.</param>
protected TemplateFactory(TTuple tuple, bool hasDelegate)
{
Validator.ThrowIfNull(tuple);
GenericArguments = tuple;
HasDelegate = hasDelegate;
}
/// <summary>
/// Gets a n-tuple representation of a <see cref="Template"/> that represents the generic arguments passed to this instance.
/// </summary>
/// <value>The n-tuple representation of a <see cref="Template"/> that represents the generic arguments passed to this instance.</value>
public TTuple GenericArguments { get; }
/// <summary>
/// Gets a value indicating whether this instance has an assigned delegate.
/// </summary>
/// <value><c>true</c> if this instance an assigned delegate; otherwise, <c>false</c>.</value>
public virtual bool HasDelegate { get; }
/// <summary>
/// Gets the method represented by the delegate.
/// </summary>
/// <value>A <see cref="MethodInfo"/> describing the method represented by the delegate. </value>
public virtual MethodInfo DelegateInfo { get; protected set; }
/// <summary>
/// Returns a <see cref="string" /> that represents this instance.
/// </summary>
/// <returns>A <see cref="string" /> that represents this instance.</returns>
public override string ToString()
{
if (HasDelegate)
{
var descriptor = new MethodDescriptor(DelegateInfo);
return descriptor.ToString();
}
return base.ToString();
}
/// <summary>
/// Validates and throws an <see cref="InvalidOperationException"/> if this instance has no valid delegate.
/// </summary>
/// <param name="delegateIsNull">The value of a condition that can be either <c>true</c> or <c>false</c>.</param>
/// <exception cref="InvalidOperationException">
/// No delegate was specified on the factory.
/// </exception>
protected void ThrowIfNoValidDelegate(bool delegateIsNull)
{
if (!HasDelegate) { throw new InvalidOperationException(delegateIsNull ? "There is no delegate specified on the factory." : FormattableString.Invariant($"There is a delegate specified on the factory, '{Decorator.Enclose(GetType()).ToFriendlyName(o => o.FullName = true)}', but it leads to a null referenced delegate wrapper.")); }
}
/// <summary>
/// Creates a shallow copy of the current <see cref="TemplateFactory{TTuple}"/> object.
/// </summary>
/// <returns>A new <see cref="TemplateFactory{TTuple}"/> implementation that is a copy of this instance.</returns>
/// <remarks>When thread safety is required this is the method to invoke.</remarks>
public abstract TemplateFactory<TTuple> Clone();
}
}