/// <summary>
/// Notifies interceptor about QueryCreating stage in query execution.
/// </summary>
/// <param name="e">
/// The <see cref="LogicSoftware.DataAccess.Repository.Extended.Events.QueryCreatingEventArgs"/> instance containing the event data.
/// </param>
/// <param name="context">
/// The context.
/// </param>
/// <returns>
/// <c>true</c>, if at least one interceptor has been executed, <c>false</c> otherwise.
/// </returns>
public bool OnQueryCreating(QueryCreatingEventArgs e, QueryContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
// no suitable interceptors found
if (context.Interceptors.Count == 0)
{
return(false);
}
// intercept
context.Interceptors.ForEach(pair => pair.Value.OnQueryCreating(e));
return(true);
}
public TResult Execute <TResult>(QueryContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
this.ExtensionsProvider.InitializeQueryContext(context);
// first pass. processing all extension-specific method calls only
Expression firstPassOutputExpression = this.Visit(context.Expression, context);
// QueryCreating stage
var queryCreating = new QueryCreatingEventArgs(firstPassOutputExpression);
this.ExtensionsProvider.OnQueryCreating(queryCreating, context);
// LoadOptionsCreating stage
var loadOptionsCreating = new LoadOptionsCreatingEventArgs(queryCreating.Expression, new LoadOptions());
this.ExtensionsProvider.OnLoadOptionsCreating(loadOptionsCreating, context);
// getting original query from repository
var originalQuery = this.Repository.All(context.ElementType, loadOptionsCreating.LoadOptions);
// QueryCreated stage
var queryCreated = new QueryCreatedEventArgs(originalQuery);
this.ExtensionsProvider.OnQueryCreated(queryCreated, context);
// concatenating expression after load options creating event with expression after query created event
Expression readyToExecuteExpression = new ExpressionConstantReplacer(context.RootQuery, queryCreated.Query.Expression).Visit(loadOptionsCreating.Expression);
// PreExecute stage
var preExecute = new PreExecuteEventArgs(readyToExecuteExpression);
this.ExtensionsProvider.OnPreExecute(preExecute, context);
return(this.ExecuteCore <TResult>(originalQuery, context, preExecute.Expression));
}
/// <summary>
/// The QueryCreating stage handler.
/// </summary>
/// <param name="e">
/// The <see cref="LogicSoftware.DataAccess.Repository.Extended.Events.QueryCreatingEventArgs"/> instance containing the event data.
/// </param>
/// <remarks>
/// Base implementation is empty.
/// </remarks>
public virtual void OnQueryCreating(QueryCreatingEventArgs e)
{
}
