DDS::TopicQuerySelection Class Reference

<<extension>> Specifies the data query that defines a DDS::TopicQuery More...

#include <managed_subscription.h>

Public Attributes
System::String ^	filter_class_name
	The name of the filter to use. More...
System::String ^	filter_expression
	The filter expression. More...
StringSeq ^	filter_parameters
	The query parameters. More...
TopicQuerySelectionKind	kind
	Indicates whether the sample selection is limited to cached samples or not. More...

Detailed Description

<<extension>> Specifies the data query that defines a DDS::TopicQuery

The query format is similar to the expression and parameters of a DDS::QueryCondition or a DDS::ContentFilteredTopic, as described in DDS::DomainParticipant::create_contentfilteredtopic_with_filter.

There are two special queries:

• DDS::DataReader::TOPIC_QUERY_SELECTION_SELECT_ALL
• DDS::DataReader::TOPIC_QUERY_SELECTION_USE_READER_CONTENT_FILTER

See also

Queries and Filters Syntax

Member Data Documentation

filter_class_name

System::String ^ DDS::TopicQuerySelection::filter_class_name

The name of the filter to use.

Name of content filter to use. Must be one of the built-in filter names or previously registered with DDS::DomainParticipant::register_contentfilter on the same DDS::DomainParticipant.

Built-in filter names are DDS::DomainParticipant::SQLFILTER_NAME and DDS::DomainParticipant::STRINGMATCHFILTER_NAME.

[default] See DDS::DataReader::TOPIC_QUERY_SELECTION_USE_READER_CONTENT_FILTER

filter_expression

System::String ^ DDS::TopicQuerySelection::filter_expression

The filter expression.

The expression to filter samples in the DataWriters. It follows the format described in Queries and Filters Syntax.

[default] See DDS::DataReader::TOPIC_QUERY_SELECTION_USE_READER_CONTENT_FILTER

See also

Queries and Filters Syntax

filter_parameters

StringSeq ^ DDS::TopicQuerySelection::filter_parameters

The query parameters.

[default] See DDS::DataReader::TOPIC_QUERY_SELECTION_USE_READER_CONTENT_FILTER

See also

DDS::DomainParticipant::create_contentfilteredtopic_with_filter.

kind

TopicQuerySelectionKind DDS::TopicQuerySelection::kind

Indicates whether the sample selection is limited to cached samples or not.

[default] DDS::TopicQuerySelectionKind::HISTORY_SNAPSHOT