public static Expression GetSparqlExpression(Expression expression, SparqlQueryBuilder queryBuilder)
{
var visitor = new SparqlGeneratorWhereExpressionTreeVisitor(queryBuilder);
var returnedExpression = visitor.VisitExpression(expression);
if (returnedExpression is SelectVariableNameExpression && expression.Type.Equals(typeof(bool)))
{
var svn = (SelectVariableNameExpression)returnedExpression;
// Single boolean member expression requires a special case addition to the filter
queryBuilder.AddFilterExpression("(?" + svn.Name + " = true)");
}
queryBuilder.AddFilterExpression(visitor.FilterExpression);
return(returnedExpression);
}
public static Expression GetSparqlExpression(Expression expression, SparqlQueryBuilder queryBuilder, bool filterOptimizationEnabled)
{
var canOptimizeFilter = filterOptimizationEnabled && CanOptimizeFilter(expression, queryBuilder);
var visitor = new SparqlGeneratorWhereExpressionTreeVisitor(queryBuilder, canOptimizeFilter, expression.Type == typeof(bool));
var returnedExpression = visitor.VisitExpression(expression);
var svn = returnedExpression as SelectVariableNameExpression;
if (svn != null && expression.Type == typeof(bool))
{
// Single boolean member expression requires a special case addition to the filter
queryBuilder.AddFilterExpression("(?" + svn.Name + " = true)");
}
queryBuilder.AddFilterExpression(visitor.FilterExpression);
return(returnedExpression);
}
protected override Expression VisitBinaryExpression(BinaryExpression expression)
{
return(_parent.VisitExpression(expression, this.InBooleanExpression));
}