/// <summary>
/// Executes a query. Calls the generic method Execute{{T}} to actually execute the query.
/// </summary>
/// <param name="expression">The query expression.</param>
/// <returns>The result of the query.</returns>
public object Execute(Expression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
var translatedQuery = MongoQueryTranslator.Translate(this, expression);
return(translatedQuery.Execute());
}
/// <summary>
/// Gets an enumerator by executing the query.
/// </summary>
/// <typeparam name="T">Type element type.</typeparam>
/// <param name="expression">The LINQ expression.</param>
/// <returns>An enumerator for the results of the query.</returns>
public IEnumerator <T> GetEnumerator <T>(Expression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
if (!typeof(IEnumerable <T>).IsAssignableFrom(expression.Type))
{
throw new ArgumentException("Argument expression is not valid.");
}
var translatedQuery = MongoQueryTranslator.Translate(_collection, expression);
return(translatedQuery.GetEnumerator <T>());
}
/// <summary>
/// Executes a query.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="expression">The query expression.</param>
/// <returns>The result of the query.</returns>
public TResult Execute <TResult>(Expression expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression");
}
if (!typeof(TResult).IsAssignableFrom(expression.Type))
{
throw new ArgumentException("Argument expression is not valid.");
}
var translatedQuery = MongoQueryTranslator.Translate(_collection, expression);
return((TResult)translatedQuery.Execute());
}
// public methods
/// <summary>
/// Builds the MongoDB query that will be sent to the server when the LINQ query is executed.
/// </summary>
/// <typeparam name="T">The type of the documents being queried.</typeparam>
/// <param name="query">The LINQ query.</param>
/// <returns>The MongoDB query.</returns>
public IMongoQuery BuildMongoQuery <T>(MongoQueryable <T> query)
{
var translatedQuery = MongoQueryTranslator.Translate(this, ((IQueryable)query).Expression);
return(((SelectQuery)translatedQuery).BuildQuery());
}
/// <summary>
/// Gets a string representation of the LINQ expression translated to a MongoDB query.
/// </summary>
/// <param name="expression">The LINQ expression.</param>
/// <returns>A string.</returns>
public string GetQueryText(Expression expression)
{
var translatedQuery = MongoQueryTranslator.Translate(_collection, expression);
return(translatedQuery.ToString());
}
