63 lines
3.1 KiB
C#
63 lines
3.1 KiB
C#
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using System;
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using System.Linq.Expressions;
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namespace MyCode.Project.Infrastructure
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{
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/// <summary>
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/// Represents that the implemented classes are specifications. For more
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/// information about the specification pattern, please refer to
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/// http://martinfowler.com/apsupp/spec.pdf.
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/// </summary>
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/// <typeparam name="T">The type of the object to which the specification
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/// is applied.</typeparam>
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public interface ISpecification<T>
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{
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/// <summary>
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/// Returns a <see cref="System.Boolean"/> value which indicates whether the specification
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/// is satisfied by the given object.
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/// </summary>
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/// <param name="obj">The object to which the specification is applied.</param>
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/// <returns>True if the specification is satisfied, otherwise false.</returns>
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bool IsSatisfiedBy(T obj);
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/// <summary>
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/// Combines the current specification instance with another specification instance
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/// and returns the combined specification which represents that both the current and
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/// the given specification must be satisfied by the given object.
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/// </summary>
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/// <param name="other">The specification instance with which the current specification
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/// is combined.</param>
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/// <returns>The combined specification instance.</returns>
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ISpecification<T> And(ISpecification<T> other);
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/// <summary>
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/// Combines the current specification instance with another specification instance
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/// and returns the combined specification which represents that either the current or
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/// the given specification should be satisfied by the given object.
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/// </summary>
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/// <param name="other">The specification instance with which the current specification
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/// is combined.</param>
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/// <returns>The combined specification instance.</returns>
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ISpecification<T> Or(ISpecification<T> other);
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/// <summary>
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/// Combines the current specification instance with another specification instance
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/// and returns the combined specification which represents that the current specification
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/// should be satisfied by the given object but the specified specification should not.
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/// </summary>
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/// <param name="other">The specification instance with which the current specification
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/// is combined.</param>
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/// <returns>The combined specification instance.</returns>
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ISpecification<T> AndNot(ISpecification<T> other);
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/// <summary>
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/// Reverses the current specification instance and returns a specification which represents
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/// the semantics opposite to the current specification.
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/// </summary>
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/// <returns>The reversed specification instance.</returns>
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ISpecification<T> Not();
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/// <summary>
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/// Gets the LINQ expression which represents the current specification.
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/// </summary>
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/// <returns>The LINQ expression.</returns>
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Expression<Func<T, bool>> GetExpression();
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}
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}
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