/// <summary>
/// Bind a filter option
/// </summary>
/// <param name="syntax">a syntactic tree containing the filter option</param>
/// <param name="rangeVariable">the range variable that iterates over the top level collection.</param>
/// <returns>A filter clause representing this filter option</returns>
public FilterClause BindFilter(SyntacticTree syntax, RangeVariable rangeVariable)
{
if (syntax.Filter != null)
{
if (rangeVariable == null)
{
throw new ODataException(ODataErrorStrings.MetadataBinder_QueryOptionNotApplicable("$filter"));
}
FilterBinder filterBinder = new FilterBinder(this.bindMethod, this.bindingState);
return(filterBinder.BindFilter(syntax.Filter));
}
return(null);
}
/// <summary>
/// Parses a <paramref name="filter"/> clause on the given <paramref name="elementType"/>, binding
/// the text into semantic nodes using the provided.
/// </summary>
/// <param name="filter">String representation of the filter expression.</param>
/// <param name="elementType">Type that the filter clause refers to.</param>
/// <param name="entitySet">EntitySet that the elements beign filtered are from.</param>
/// <returns>A <see cref="FilterClause"/> representing the metadata bound filter expression.</returns>
private FilterClause ParseFilterImplementation(string filter, IEdmType elementType, IEdmEntitySet entitySet)
{
ExceptionUtils.CheckArgumentNotNull(this.configuration, "this.configuration");
ExceptionUtils.CheckArgumentNotNull(elementType, "elementType");
ExceptionUtils.CheckArgumentNotNull(filter, "filter");
// Get the syntactic representation of the filter expression
UriQueryExpressionParser expressionParser = new UriQueryExpressionParser(this.Settings.FilterLimit);
QueryToken filterToken = expressionParser.ParseFilter(filter);
// Bind it to metadata
BindingState state = new BindingState(this.configuration);
state.ImplicitRangeVariable = NodeFactory.CreateImplicitRangeVariable(elementType.ToTypeReference(), entitySet);
state.RangeVariables.Push(state.ImplicitRangeVariable);
MetadataBinder binder = new MetadataBinder(state);
FilterBinder filterBinder = new FilterBinder(binder.Bind, state);
FilterClause boundNode = filterBinder.BindFilter(filterToken);
return(boundNode);
}