QueryText Class Reference

#include "lib/query-text.hpp"

Description

Syntactical query representation.

Used as a backbone to allow for generic queries and to enable programmatically rebuilding and remolding of queries.

Todo:

this is placeholder code and just embeds a string with the raw query definition, instead of parsing the definition and transforming it into an AST

See also

Query

Definition at line 70 of file query-text.hpp.

Public Member Functions
	QueryText (string const &syntacticRepr)
uint	degree_of_constriction () const
	synthetic total order to classify query definitions. More...
bool	empty () const
bool	hasAtom (string const &predSymbol)
	operator string () const

Friends
HashVal	hash_value (QueryText const &entry)
	support using queries in hashtables. More...
bool	operator< (QueryText const &q1, QueryText const &q2)
bool	operator== (QueryText const &q1, QueryText const &q2)

Private Member Functions
string	normalise (string const &rawDefinition)
	Parse, verify and normalise the raw query definition. More...

Private Attributes
string	definition_

Member Function Documentation

degree_of_constriction()

uint degree_of_constriction ( ) const

inline

synthetic total order to classify query definitions.

Queries with more specific conditions should yield larger values.

Warning

this is rather a design idea and it's not clear if this metric can be made to work in practice

Todo:

using a rather deaf placeholder implementation based just on counting the top level predicates.

Definition at line 110 of file query-text.hpp.

References steam::mobject::session::query::anonymous_namespace{fake-configrules.cpp}::entry(), QueryText::hash_value, and QueryText::normalise().

Referenced by QueryKey::QueryKey().

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normalise()

string normalise ( string const &  rawDefinition )

private

Parse, verify and normalise the raw query definition.

Warning

right now (2012) we don't normalise at all

Todo:

when integrating a real resolution engine, we need to parse and verify the given string.

Definition at line 46 of file query-text.cpp.

Referenced by QueryText::degree_of_constriction().

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Friends And Related Function Documentation

hash_value

HashVal hash_value ( QueryText const &  entry )

friend

support using queries in hashtables.

Warning

right now (2012) the dummy implementation of QueryText doesn't normalise the query in any way, which makes the generated hash value dependent on the actual textual form used to build the QueryText. This is not how it's intended to work, it should rely on a normalised form after parsing the query definition.

Definition at line 61 of file query-text.cpp.

Referenced by QueryText::degree_of_constriction().

Collaboration diagram for QueryText:

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The documentation for this class was generated from the following files:

• query-text.hpp
• query-text.cpp