ERXToManyQualifier Class Reference

Inherits er::extensions::qualifiers::ERXKeyValueQualifier.

Inherited by ERXEOToManyQualifier.

Collaboration diagram for ERXToManyQualifier:

[legend]

List of all members.

Classes
class	ToManyQualifierSQLGenerationSupport
Public Member Functions
void	addQualifierKeysToSet (NSMutableSet arg0)
Object	clone ()
NSArray	elements ()
	ERXToManyQualifier (String toManyKey, NSArray elements, int minCount)
	ERXToManyQualifier (String toManyKey, NSArray elements)
boolean	evaluateWithObject (Object object)
String	key ()
int	minCount ()
EOQualifier	qualifierWithBindings (NSDictionary arg0, boolean arg1)
String	toString ()
void	validateKeysWithRootClassDescription (EOClassDescription arg0)
Static Public Attributes
static final Logger	log = Logger.getLogger(ERXToManyQualifier.class)
static final String	MatchesAllInArraySelectorName = "matchesAllInArray"
Static Package Functions
	[static initializer]
Private Attributes
NSArray	_elements
int	_minCount = 0
String	_toManyKey

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Detailed Description

Optimized toMany qualifier, much, much better SQL than the Apple provided qualifier. Really nice when you want to find all the eos that have say five of the ten eos in their toMany relationship. This qualifier will always only generate three joins no matter how many eos you are trying to find. Example usage:

 NSArray employees; // given, can be null
 // Find all of the departments that have all of those employees
 ERXToManyQualifier q = new ERXToManyQualifier("toEmployees", employees);
 EOFetchSpecification fs = new EOFetchSpecification("Department", q, null);
 NSArray departments = ec.objectsWithFetchSpecification(fs);
 

If you want to find say departments that have 5 or more of the given employees (imagine you have a list of 10 or so), then you could construct the qualifier like:
ERXToManyQualifier q = new ERXToManyQualifier("toEmployees", employees, 5);
or to find any department that has at least one of the given employees
ERXToManyQualifier q = new ERXToManyQualifier("toEmployees", employees, 1);

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Constructor & Destructor Documentation

ERXToManyQualifier	(	String	toManyKey,
		NSArray	elements
	)

ERXToManyQualifier	(	String	toManyKey,
		NSArray	elements,
		int	minCount
	)

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Member Function Documentation

[static initializer]

(

)

[static, package]

register SQL generation support for the qualifier

void addQualifierKeysToSet

(

NSMutableSet

arg0

)

Object clone

(

)

Implementation of the Cloneable interface.

Returns:

clone of the qualifier.

NSArray elements

(

)

boolean evaluateWithObject

(

Object

object

)

String key

(

)

int minCount

(

)

EOQualifier qualifierWithBindings	(	NSDictionary	arg0,
		boolean	arg1
	)

String toString

(

)

Description of the qualfier.

Returns:

description of the key and which elements it should contain.

void validateKeysWithRootClassDescription

(

EOClassDescription

arg0

)

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Member Data Documentation

NSArray _elements [private]

holds the array of elements

int _minCount = 0 [private]

holds the min count to match against, defaults to 0

String _toManyKey [private]

holds the to many key

final Logger log = Logger.getLogger(ERXToManyQualifier.class) [static]

logging support

final String MatchesAllInArraySelectorName = "matchesAllInArray" [static]

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

• /opt/source/Wonder/Frameworks/Core/ERExtensions/Sources/er/extensions/eof/qualifiers/ERXToManyQualifier.java