EOQualifierVariable

Inherits from:

(com.apple.client.eocontrol) Object
(com.apple.yellow.eocontrol) NSObject

Implements:

(com.apple.client.eocontrol only) NSCoding

Package:

com.apple.client.eocontrol

com.apple.yellow.eocontrol

Class Description

EOQualifierVariable defines objects that serve as placeholders in the qualifier. When you create a qualifier programmatically, you typically do something like this:

aQual = [EOQualifier qualifierWithQualifierFormat:"dateReleased = %@", aDate];

where aDate is a variable that contains the actual date you want to query upon. When you store the qualifier in an EOModel, there is no way to know the actual value to query upon or the variable that will contain that value. The EOQualifierVariable object acts as a placeholder for the actual variable that will represent the right side of the expression. You specify an EOQualifierVariable by using a $, as in the following:

dateReleased = $aDate

Variable values must be substituted for using qualifierWithBindings.

Constants

(com.apple.yellow.eocontrol only) EOQualifierVariable defines the following String constant as the type of exception that's raised when an EOQualifierVariable object requires bindings for all its variables and one or more variable is missing from the bindings (see qualifierWithBindings in the EOQualifier class specification):

• QualifierVariableSubstitutionException

Interfaces Implemented

NSCoding

classForCoder

encodeWithCoder

Constructors

EOQualifierVariable

public EOQualifierVariable(String key)

Static Methods

variableWithKey

public static Object variableWithKey(String key)

Instance Methods

key

public String key()