C# Class Azavea.Open.DAO.Memory.SinglePropertyMemoryIndex

An index on a single field, keeps groups of the memory objects in a dictionary keyed by the values of the field.

Inheritance: AbstractMemoryIndex

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Méthodes publiques

Méthode	Description
GetCardinality ( DaoCriteria crit ) : int	Returns a number indicating how many breaks this index has for the properties used in the criteria. Roughly speaking, higher is better (though the number is an estimate, it is possible to have data that makes the index inefficient). If there are multiple indexes, the one that returns the highest number from this method will be used. An index should return 1 to indicate that it offers no value for this criteria.
GetPossibleMatches ( DaoCriteria crit ) : IList	Uses the index to return the smallest number of possible matches for this criteria.
Rebuild ( IEnumerable objects ) : void	This method rebuilds the index given a new list of data objects.
SinglePropertyMemoryIndex ( MemoryDaLayer layer, string property, IEnumerable objects ) : System	An index on a single field, keeps groups of the memory objects in a dictionary keyed by the values of the field.

Method Details

GetCardinality() public méthode

Returns a number indicating how many breaks this index has for the properties used in the criteria. Roughly speaking, higher is better (though the number is an estimate, it is possible to have data that makes the index inefficient). If there are multiple indexes, the one that returns the highest number from this method will be used. An index should return 1 to indicate that it offers no value for this criteria.

public GetCardinality ( DaoCriteria crit ) : int
crit	Azavea.Open.DAO.Criteria.DaoCriteria	The query being run.
Résultat	int

GetPossibleMatches() public méthode

Uses the index to return the smallest number of possible matches for this criteria.

public GetPossibleMatches ( DaoCriteria crit ) : IList
crit	Azavea.Open.DAO.Criteria.DaoCriteria	The query being run.
Résultat	IList

Rebuild() public méthode

This method rebuilds the index given a new list of data objects.

public Rebuild ( IEnumerable objects ) : void
objects	IEnumerable	All the objects in the data store.
Résultat	void

SinglePropertyMemoryIndex() public méthode

An index on a single field, keeps groups of the memory objects in a dictionary keyed by the values of the field.

public SinglePropertyMemoryIndex ( MemoryDaLayer layer, string property, IEnumerable objects ) : System
layer	MemoryDaLayer	The data access layer in use.
property	string	The property to index on.
objects	IEnumerable	All the objects in this index.
Résultat	System