/// <summary>
/// Clones this <see cref="QueryModel"/>, returning a new <see cref="QueryModel"/> equivalent to this instance, but with its clauses being
/// clones of this instance's clauses. Any <see cref="QuerySourceReferenceExpression"/> in the cloned clauses that points back to another clause
/// in this <see cref="QueryModel"/> (including its subqueries) is adjusted to point to the respective clones in the cloned
/// <see cref="QueryModel"/>. Any subquery nested in the <see cref="QueryModel"/> is also cloned.
/// </summary>
/// <param name="querySourceMapping">The <see cref="QuerySourceMapping"/> defining how to adjust instances of
/// <see cref="QuerySourceReferenceExpression"/> in the cloned <see cref="QueryModel"/>. If there is a <see cref="QuerySourceReferenceExpression"/>
/// that points out of the <see cref="QueryModel"/> being cloned, specify its replacement via this parameter. At the end of the cloning process,
/// this object maps all the clauses in this original <see cref="QueryModel"/> to the clones created in the process.
/// </param>
public QueryModel Clone(QuerySourceMapping querySourceMapping)
{
ArgumentUtility.CheckNotNull("querySourceMapping", querySourceMapping);
var cloneContext = new CloneContext(querySourceMapping);
var queryModelBuilder = new QueryModelBuilder();
queryModelBuilder.AddClause(MainFromClause.Clone(cloneContext));
foreach (var bodyClause in BodyClauses)
{
queryModelBuilder.AddClause(bodyClause.Clone(cloneContext));
}
queryModelBuilder.AddClause(SelectClause.Clone(cloneContext));
foreach (var resultOperator in ResultOperators)
{
var resultOperatorClone = resultOperator.Clone(cloneContext);
queryModelBuilder.AddResultOperator(resultOperatorClone);
}
var clone = queryModelBuilder.Build();
clone.TransformExpressions(ex => CloningExpressionTreeVisitor.AdjustExpressionAfterCloning(ex, cloneContext.QuerySourceMapping));
clone.ResultTypeOverride = ResultTypeOverride;
return(clone);
}
public void Replaces_SubQueryExpressions()
{
var expression = new SubQueryExpression(ExpressionHelper.CreateQueryModel <Cook> ());
var result = CloningExpressionTreeVisitor.AdjustExpressionAfterCloning(expression, _querySourceMapping);
Assert.That(((SubQueryExpression)result).QueryModel, Is.Not.SameAs(expression.QueryModel));
}
public void Replaces_SubQueryExpressions_WithCorrectCloneContext()
{
var subQueryModel = ExpressionHelper.CreateQueryModel <Cook> ();
var referencedClause = ExpressionHelper.CreateMainFromClause_Int();
subQueryModel.SelectClause.Selector = new QuerySourceReferenceExpression(referencedClause);
var expression = new SubQueryExpression(subQueryModel);
var newReferenceExpression = new QuerySourceReferenceExpression(ExpressionHelper.CreateMainFromClause_Int());
_querySourceMapping.AddMapping(referencedClause, newReferenceExpression);
var result = CloningExpressionTreeVisitor.AdjustExpressionAfterCloning(expression, _querySourceMapping);
var newSubQuerySelectClause = ((SubQueryExpression)result).QueryModel.SelectClause;
Assert.That(newSubQuerySelectClause.Selector, Is.SameAs(newReferenceExpression));
}
