SMWConjunction Class Reference
[SMWQuery]

Description of a collection of many descriptions, all of which must be satisfied (AND, conjunction). More...

Inherits SMWDescription.

List of all members.

Public Member Functions
	__construct ($descriptions=array())
	getDescriptions ()
	addDescription (SMWDescription $description)
	getQueryString ($asvalue=false)
	Return a string expressing this query.
	isSingleton ()
	Return true if the description is required to encompass at most a single result, independently of the knowledge base.
	getSize ()
	Compute the size of the decription.
	getDepth ()
	Compute the depth of the decription.
	getQueryFeatures ()
	Report on query features used in description.
	prune (&$maxsize, &$maxdepth, &$log)
	Recursively restrict query to a maximal size and depth as given.
Protected Attributes
	$m_descriptions

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Detailed Description

Description of a collection of many descriptions, all of which must be satisfied (AND, conjunction).

Corresponds to conjunction in OWL and SPARQL. Not available in RDFS.

Definition at line 453 of file SMW_Description.php.

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Constructor & Destructor Documentation

SMWConjunction::__construct

(

$

descriptions = array()

)

Definition at line 457 of file SMW_Description.php.

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Member Function Documentation

SMWConjunction::getDescriptions

(

)

Definition at line 461 of file SMW_Description.php.

Referenced by addDescription(), SMWSparqlStoreQueryEngine::buildConjunctionCondition(), and prune().

SMWConjunction::addDescription

(

SMWDescription $

description

)

TODO: This may not be a good solution, since it does modify $description and since it does not react to future changes

Definition at line 465 of file SMW_Description.php.

References getDescriptions(), SMWDescription::getPrintRequests(), and SMWDescription::setPrintRequests().

SMWConjunction::getQueryString

(

$

asvalue = false

)

Return a string expressing this query.

Some descriptions have different syntax in property value positions. The parameter $asvalue specifies whether the serialisation should take that into account.

Example: The SMWValueDescription [[Paris]] returns the single result "Paris" but can also be used as value in [[has location::Paris]] which is preferred over the canonical [[has location::<q>[[Paris]]</q>]].

Parameters:

boolean

$asvalue

Returns:

string

Reimplemented from SMWDescription.

Definition at line 482 of file SMW_Description.php.

Referenced by prune().

SMWConjunction::isSingleton

(

)

Return true if the description is required to encompass at most a single result, independently of the knowledge base.

Returns:

boolean

Reimplemented from SMWDescription.

Definition at line 496 of file SMW_Description.php.

SMWConjunction::getSize

(

)

Compute the size of the decription.

Default is 1.

Returns:

integer

Reimplemented from SMWDescription.

Definition at line 505 of file SMW_Description.php.

SMWConjunction::getDepth

(

)

Compute the depth of the decription.

Default is 0.

Returns:

integer

Reimplemented from SMWDescription.

Definition at line 515 of file SMW_Description.php.

SMWConjunction::getQueryFeatures

(

)

Report on query features used in description.

Return values are (sums of) query feature constants such as SMW_PROPERTY_QUERY.

Reimplemented from SMWDescription.

Definition at line 525 of file SMW_Description.php.

SMWConjunction::prune	(	&$	maxsize,
		&$	maxdepth,
		&$	log
	)

Recursively restrict query to a maximal size and depth as given.

Returns a possibly changed description that should be used as a replacement. Reduce values of parameters to account for the returned descriptions size. Default implementation for non-nested descriptions of size 1. The parameter $log contains a list of all pruned conditions, updated when some description was reduced.

Note:

Objects must not do changes on $this during pruning, since $this can be reused in multiple places of one or many queries. Make new objects to reflect changes!

Reimplemented from SMWDescription.

Definition at line 535 of file SMW_Description.php.

References getDescriptions(), SMWDescription::getPrintRequests(), and getQueryString().

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Member Data Documentation

SMWConjunction::$m_descriptions [protected]

Definition at line 455 of file SMW_Description.php.

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

• SemanticMediaWiki/includes/storage/SMW_Description.php