DDD Specification with AND Operator

using System.Linq.Expressions;

namespace ExpenseService.Domain.Shared.Interfaces;

/// <summary>
/// Represents a specification that defines a condition that an entity must satisfy.
/// </summary>
/// <typeparam name="T">The type of entity.</typeparam>
public interface ISpecification<T> where T: class
{
    bool IsSatisfiedBy(T entity);

    Expression<Func<T, bool>> ToExpression();
    
    ISpecification<T> And(ISpecification<T> other);
}

using System.Linq.Expressions;
using ExpenseService.Domain.Shared.Interfaces;

namespace ExpenseService.Domain.Specifications;


public abstract class Specification<T> : ISpecification<T> where T : class
{
    
    public abstract Expression<Func<T, bool>> ToExpression();


    public virtual bool IsSatisfiedBy(T entity)
    {
        var predicate = ToExpression().Compile();
        return predicate(entity);
    }
    
    
    public ISpecification<T> And(ISpecification<T> other)
    {

    }
}