/// <summary>
/// Add order expressed as a lambda expression
/// </summary>
/// <param name="criteria">criteria instance</param>
/// <param name="expression">Lambda expression</param>
/// <param name="orderDelegate">Order delegate (direction)</param>
/// <returns>criteria instance</returns>
public static ICriteria AddOrder(this ICriteria criteria,
Expression <Func <object> > expression,
Func <string, Order> orderDelegate)
{
Order order = ExpressionProcessor.ProcessOrder(expression, orderDelegate);
criteria.AddOrder(order);
return(criteria);
}
/// <summary>
/// Join an association, assigning an alias to the joined entity
/// </summary>
/// <param name="criteria">criteria instance</param>
/// <param name="expression">Lambda expression returning association path</param>
/// <param name="alias">Lambda expression returning alias reference</param>
/// <returns>criteria instance</returns>
public static ICriteria CreateAlias(this ICriteria criteria,
Expression <Func <object> > expression,
Expression <Func <object> > alias)
{
string path = ExpressionProcessor.FindMemberExpression(expression.Body);
string aliasContainer = ExpressionProcessor.FindMemberExpression(alias.Body);
return(criteria.CreateAlias(path, aliasContainer));
}
/// <summary>
/// Join an association, assigning an alias to the joined entity
/// </summary>
/// <param name="criteria">criteria instance</param>
/// <param name="expression">Lambda expression returning association path</param>
/// <param name="alias">Lambda expression returning alias reference</param>
/// <param name="joinType">The type of join to use</param>
/// <returns>criteria instance</returns>
public static DetachedCriteria CreateAlias(this DetachedCriteria criteria,
Expression <Func <object> > expression,
Expression <Func <object> > alias,
JoinType joinType)
{
string path = ExpressionProcessor.FindMemberExpression(expression.Body);
string aliasContainer = ExpressionProcessor.FindMemberExpression(alias.Body);
return(criteria.CreateAlias(path, aliasContainer, joinType));
}
/// <summary>
/// Create a DetachedCriteria with a strongly typed alias
/// </summary>
/// <param name="alias">Lambda expression returning alias reference</param>
/// <returns>Newly created DetachedCriteria</returns>
public static DetachedCriteria Create(Expression <Func <object> > alias)
{
string aliasContainer = ExpressionProcessor.FindMemberExpression(alias.Body);
return(DetachedCriteria.For <T>(aliasContainer));
}
/// <summary>
/// Return the negation of an expression
/// </summary>
/// <param name="expression">Lambda expression</param>
/// <returns>A NHibernate.Criterion.NotExpression.</returns>
public static ICriterion Not(Expression <Func <bool> > expression)
{
ICriterion criterion = ExpressionProcessor.ProcessExpression(expression);
return(Restrictions.Not(criterion));
}
/// <summary>
/// Create an ICriterion for the supplied LambdaExpression
/// </summary>
/// <param name="expression">lambda expression</param>
/// <returns>return NHibernate.Criterion.ICriterion</returns>
public static ICriterion CriterionFor(Expression <Func <bool> > expression)
{
ICriterion criterion = ExpressionProcessor.ProcessExpression(expression);
return(criterion);
}
/// <summary>
/// Apply an "is not empty" constraint to the named property
/// </summary>
/// <param name="expression">lambda expression returning type's property</param>
/// <returns>A NHibernate.Criterion.IsNotEmptyExpression.</returns>
public static ICriterion IsNotEmpty(Expression <Func <IEnumerable> > expression)
{
string property = ExpressionProcessor.FindMemberExpression(expression.Body);
return(Restrictions.IsNotEmpty(property));
}
/// <summary>
/// Apply an "is not null" constraint to the named property
/// </summary>
/// <param name="expression">lambda expression returning type's property</param>
/// <returns>A NHibernate.Criterion.NotNullExpression.</returns>
public static ICriterion IsNotNull(Expression <Func <object> > expression)
{
string property = ExpressionProcessor.FindMemberExpression(expression.Body);
return(Restrictions.IsNotNull(property));
}
/// <summary>
/// Create ICriterion for (all) subquery expression using lambda syntax
/// </summary>
/// <param name="expression">lambda expression</param>
/// <returns>NHibernate.ICriterion.AbstractCriterion</returns>
public static AbstractCriterion WhereAll(Expression <Func <bool> > expression)
{
AbstractCriterion criterion = ExpressionProcessor.ProcessSubquery(LambdaSubqueryType.All, expression);
return(criterion);
}
/// <summary>
/// Create ICriterion for subquery expression using lambda syntax
/// </summary>
/// <typeparam name="T">type of property</typeparam>
/// <param name="expression">lambda expression</param>
/// <returns>NHibernate.ICriterion.AbstractCriterion</returns>
public static AbstractCriterion Where <T>(Expression <Func <T, bool> > expression)
{
AbstractCriterion criterion = ExpressionProcessor.ProcessSubquery <T>(LambdaSubqueryType.Exact, expression);
return(criterion);
}
/// <summary>
/// Create a ICriterion for the specified property subquery expression
/// </summary>
/// <param name="expression">lambda expression</param>
/// <returns>returns LambdaSubqueryBuilder</returns>
public static LambdaSubqueryBuilder Property(Expression <Func <object> > expression)
{
string property = ExpressionProcessor.FindMemberExpression(expression.Body);
return(new LambdaSubqueryBuilder(property));
}
/// <summary>
/// Count projection
/// </summary>
/// <typeparam name="T">generic type</typeparam>
/// <param name="expression">lambda expression</param>
/// <returns>return NHibernate.Criterion.CountProjection</returns>
public static CountProjection Count <T>(Expression <Func <T, object> > expression)
{
string property = ExpressionProcessor.FindMemberExpression(expression.Body);
return(Projections.Count(property));
}
/// <summary>
/// Average projection
/// </summary>
/// <param name="expression">lambda expression</param>
/// <returns>return NHibernate.Criterion.AggregateProjection</returns>
public static AggregateProjection Avg(Expression <Func <object> > expression)
{
string property = ExpressionProcessor.FindMemberExpression(expression.Body);
return(Projections.Avg(property));
}
/// <summary>
/// Create an IProjection for the specified property expression
/// </summary>
/// <param name="expression">lambda expression</param>
/// <returns>return NHibernate.Criterion.PropertyProjection</returns>
public static PropertyProjection Property(Expression <Func <object> > expression)
{
string property = ExpressionProcessor.FindMemberExpression(expression.Body);
return(Projections.Property(property));
}
