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namespace Marina.Infrastructure {
public class SpecificationBuilder< T > : ISpecificationBuilder< T > {
public SpecificationBuilder() : this( new BlankSpecification( ) ) {}
public SpecificationBuilder( ISpecification< T > criteria ) {
_criteria = criteria;
}
public bool IsSatisfiedBy( T item ) {
return _criteria.IsSatisfiedBy( item );
}
public ISpecificationBuilder< T > And( ISpecification< T > specification ) {
_criteria = new AndSpecification< T >( _criteria, specification );
return this;
}
public ISpecification< T > Build() {
return _criteria;
}
public class BlankSpecification : ISpecification< T > {
public bool IsSatisfiedBy( T item ) {
return true;
}
}
private ISpecification< T > _criteria;
private class AndSpecification< K > : ISpecification< K > {
public AndSpecification( ISpecification< K > leftCriteria, ISpecification< K > rightCriteria ) {
this.leftCriteria = leftCriteria;
this.rightCriteria = rightCriteria;
}
public bool IsSatisfiedBy( K item ) {
return leftCriteria.IsSatisfiedBy( item ) && rightCriteria.IsSatisfiedBy( item );
}
private readonly ISpecification< K > leftCriteria;
private readonly ISpecification< K > rightCriteria;
}
}
}
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