LSUpdateInfo Class Reference

The LSUpdateInfo class provides information about an update for a subscribed item. More...

#import <LSUpdateInfo.h>

List of all members.

Public Member Functions
(id)	- initWithItemPosition:itemName:fieldNames:oldValues:newValues:isSnapshot:
	Initializes an LSUpdateInfo object with the specified parameters.
(BOOL)	- isChangedValueOfFieldPosition:
	Tells if the value for a field has changed after the reception of this update.
(BOOL)	- isChangedValueOfFieldName:
	Tells if the value for a field has changed after the reception of this update.
(NSString *)	- currentValueOfFieldPosition:
	Gets the value for a field as it is after the reception of this update.
(NSString *)	- currentValueOfFieldName:
	Gets the value for a field as it is after the reception of this update.
(NSString *)	- previousValueOfFieldPosition:
	Gets the value for a field as it was before the reception of this update.
(NSString *)	- previousValueOfFieldName:
	Gets the value for a field as it was before the reception of this update.
Static Public Member Functions
(LSUpdateInfo *)	+ updateInfoForItemPosition:itemName:fieldNames:oldValues:newValues:isSnapshot:
	Creates and returns an LSUpdateInfo object with the specified parameters.
Properties
int	itemPosition
	The 1-based position of the item in the Group of items in the related table.
NSString *	itemName
	The item name, or nil if an LSTableInfo was used to describe the related table.
int	numberOfFields
	The number of fields of the Schema used to subscribe the table.
BOOL	isSnapshot
	Tells if the update is part of the initial snapshot.

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Detailed Description

The LSUpdateInfo class provides information about an update for a subscribed item.

The new and previous values for the subscribed fields are reported.
NOTE: If the table subscription configuration enables the "COMMAND logic", then the old field values are referred to the same key.
Both names and positional information can be used to identify the specific fields, unless an LSTableInfo was used to describe the related table: in that case, only positional information can be used.

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Member Function Documentation

- (NSString *) currentValueOfFieldName:

(NSString *)

fieldName

Gets the value for a field as it is after the reception of this update.

Parameters:

fieldName

A field name.

Returns:

The field value (nil is legal value too).

Exceptions:

NSInvalidArgumentException	Thrown in case the specified field name does not represent a subscribed field.
LSException	Thron in case an LSTableInfo was used to describe the related table.

- (NSString *) currentValueOfFieldPosition:

(int)

fieldPosition

Gets the value for a field as it is after the reception of this update.

Parameters:

fieldPosition

The 1-based field position within the Schema of fields in the related table.

Returns:

The field value (nil is legal value too).

Exceptions:

NSInvalidArgumentException

Thrown in case the specified field position does not represent a subscribed field.

- (id) initWithItemPosition:		(int)	itemPosition
itemName:		(NSString *)	itemName
fieldNames:		(NSArray *)	fieldNames
oldValues:		(NSArray *)	oldValues
newValues:		(NSArray *)	newValues
isSnapshot:		(BOOL)	isSnapshot

Initializes an LSUpdateInfo object with the specified parameters.

Parameters:

itemPosition	The 1-based position of the item in the Group of items in the related table.
itemName	The item name, or nil if an LSTableInfo was used to describe the related table.
fieldNames	An array of strings containing the names of fields of the Schema used to subscribe the table, or nil if an LSTableInfo was used to describe the related table.
oldValues	An array of strings containing the previous values of fields of the Schema.
newValues	An array of strings containing the current values of fields of the Schema.
isSnapshot	Tells if the update is part of the initial snapshot.

Returns:

The LSUpdateInfo object.

- (BOOL) isChangedValueOfFieldName:

(NSString *)

fieldName

Tells if the value for a field has changed after the reception of this update.

For the first update for the item, it always returns YES.

Parameters:

fieldName

A field name.

Returns:

YES if the updated value is different than the previous one.

Exceptions:

NSInvalidArgumentException	Thrown in case the specified field name does not represent a subscribed field.
LSException	Thron in case an LSTableInfo was used to describe the related table.

- (BOOL) isChangedValueOfFieldPosition:

(int)

fieldPosition

Tells if the value for a field has changed after the reception of this update.

For the first update for the item, it always returns YES.

Parameters:

fieldPosition

The 1-based field position within the Schema of fields in the related table.

Returns:

YES if the updated value is different than the previous one.

Exceptions:

NSInvalidArgumentException

Thrown in case the specified field position does not represent a subscribed field.

- (NSString *) previousValueOfFieldName:

(NSString *)

fieldName

Gets the value for a field as it was before the reception of this update.

Parameters:

fieldName

A field name.

Returns:

The previous field value (nil is a legal value too).

Exceptions:

NSInvalidArgumentException	Thrown in case the specified field name does not represent a subscribed field.
LSException	Thron in case an LSTableInfo was used to describe the related table.

- (NSString *) previousValueOfFieldPosition:

(int)

fieldPosition

Gets the value for a field as it was before the reception of this update.

Parameters:

fieldPosition

The 1-based field position within the Schema of fields in the related table.

Returns:

The previous field value (nil is a legal value too).

Exceptions:

NSInvalidArgumentException

Thrown in case the specified field position does not represent a subscribed field.

+ (LSUpdateInfo *) updateInfoForItemPosition:		(int)	itemPosition
itemName:		(NSString *)	itemName
fieldNames:		(NSArray *)	fieldNames
oldValues:		(NSArray *)	oldValues
newValues:		(NSArray *)	newValues
isSnapshot:		(BOOL)	isSnapshot

Creates and returns an LSUpdateInfo object with the specified parameters.

Parameters:

itemPosition	The 1-based position of the item in the Group of items in the related table.
itemName	The item name, or nil if an LSTableInfo was used to describe the related table.
fieldNames	An array of strings containing the names of fields of the Schema used to subscribe the table, or nil if an LSTableInfo was used to describe the related table.
oldValues	An array of strings containing the previous values of fields of the Schema.
newValues	An array of strings containing the current values of fields of the Schema.
isSnapshot	Tells if the update is part of the initial snapshot.

Returns:

The LSUpdateInfo object.

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Property Documentation

- (BOOL) isSnapshot [read, assign]

Tells if the update is part of the initial snapshot.

- (NSString*) itemName [read, assign]

The item name, or nil if an LSTableInfo was used to describe the related table.

- (int) itemPosition [read, assign]

The 1-based position of the item in the Group of items in the related table.

- (int) numberOfFields [read, assign]

The number of fields of the Schema used to subscribe the table.

In case an LSTableInfo was used to describe the related table, this number might not be known at subscription time.

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

• LSUpdateInfo.h