public Task <bool> ExistsQueryAsync(BigInteger id, BlockParameter blockParameter = null)
{
var existsFunction = new ExistsFunction();
existsFunction.Id = id;
return(ContractHandler.QueryAsync <ExistsFunction, bool>(existsFunction, blockParameter));
}
/// <summary>
/// Creates a call of the EXISTS function
/// </summary>
/// <param name="eb"></param>
/// <param name="buildExistsPattern">a function, which will create the graph pattern parameter</param>
public static BooleanExpression Exists(this ExpressionBuilder eb, Action <IGraphPatternBuilder> buildExistsPattern)
{
GraphPatternBuilder builder = new GraphPatternBuilder();
buildExistsPattern(builder);
var existsFunction = new ExistsFunction(builder.BuildGraphPattern(eb.Prefixes), true);
return(new BooleanExpression(existsFunction));
}
public void FilterInsideNotExists()
{
// given
var b = QueryBuilder.SelectAll()
.Where(tpb => tpb.Subject("x").PredicateUri(":p").Object("n"))
.Filter(fb => !fb.Exists(ex => ex.Where(tpb => tpb.Subject("x").PredicateUri(":q").Object("m"))
.Filter(inner => inner.Variable("n") != inner.Variable("m"))));
b.Prefixes.AddNamespace("", new Uri("http://example.com/"));
// when
var q = b.BuildQuery();
// then
ExistsFunction exists = (ExistsFunction)q.RootGraphPattern.Filter.Expression.Arguments.First();
Assert.True(exists.Arguments.Single() is GraphPatternTerm);
Assert.True(((GraphPatternTerm)exists.Arguments.Single()).Pattern.IsFiltered);
}
public Task <bool> ExistsQueryAsync(ExistsFunction existsFunction, BlockParameter blockParameter = null)
{
return(ContractHandler.QueryAsync <ExistsFunction, bool>(existsFunction, blockParameter));
}
