Method updateSideAction

lists.go:163–185

(side LSide, newAddress string, c Client)

}

func (ln listNode) updateSideAction(side LSide, newAddress string, c Client) dynamodb.TransactWriteItem {
	updater := newExpresionBuilder()
	updater.addConditionEquality(ln.prevAttr(side), StringValue{ln.prev(side)})
	updater.addConditionEquality(ln.nextAttr(side), StringValue{ln.next(side)})
	updater.updateSET(ln.prevAttr(side), StringValue{newAddress})

	if newAddress == listNull || ln.next(side) == listNull {
		updater.updateSET(c.skN, IntValue{1})
	} else {
		updater.updateSET(c.skN, IntValue{0})
	}

	return dynamodb.TransactWriteItem{
		Update: &dynamodb.Update{
			ConditionExpression:       updater.conditionExpression(),
			ExpressionAttributeNames:  updater.expressionAttributeNames(),
			ExpressionAttributeValues: updater.expressionAttributeValues(),
			Key:                       ln.keyAV(c),
			TableName:                 aws.String(c.table),
			UpdateExpression:          updater.updateExpression(),
		},
	}
}

func (ln listNode) isTail() bool {
	return ln.right == listNull