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

This is an index that has a nested index (I.E. an index on two or more fields).

Inheritance: AbstractMemoryIndex

Public Methods

Method	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.
MultiPropertyMemoryIndex ( MemoryDaLayer layer, string property, List nextProperties, IEnumerable objects ) : System	This is an index that has a nested index (I.E. an index on two or more fields).
Rebuild ( IEnumerable objects ) : void	This method rebuilds the index given a new list of data objects.

Private Methods

Method	Description
AddObjectsToSubIndexes ( IEnumerable objects ) : void

Method Details

GetCardinality() public method

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.
return	int

GetPossibleMatches() public method

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.
return	IList

MultiPropertyMemoryIndex() public method

This is an index that has a nested index (I.E. an index on two or more fields).

public MultiPropertyMemoryIndex ( MemoryDaLayer layer, string property, List nextProperties, IEnumerable objects ) : System
layer	MemoryDaLayer	Data access layer in use.
property	string	Property for this index.
nextProperties	List	Properties for the child indexes. Must have at least one.
objects	IEnumerable	All objects that will be in this index and its children.
return	System

Rebuild() public method

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.
return	void