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Continued
CHAPTER 9 VALIDATION
Table 9-1. Continued
Operator
IS NULL, NULL IS NOT NULL, NOT NULL HAS TEXT
Types
Any Any Any (*)
Null Safe
Yes (true) Yes (false) Yes (false)
Description
Tests value to the left is null. Tests value to the left is not null. Tests String value to the left contains characters other than white space, has more than 0 characters and is not null. Tests String value to the left contains only white-space characters, contains no characters or is null. Tests String value to the left is not null and has more than 0 characters. Tests String value to the left is null or contains no characters. Same as HAS LENGTH. Same as HAS NO LENGTH. Tests alpha characters in String value to the left are all uppercase. Tests not all alpha characters in String value to the left are uppercase. Tests alpha characters in String value to the left are all lowercase. Tests not all alpha characters in String value to left are lowercase. Tests String value to the left contains no white-space characters. Tests String value to the left contains and least one white-space character.
HAS NO TEXT
Any (*)
Yes (true)
HAS LENGTH
Any (*)
Yes (false)
HAS NO LENGTH IS BLANK IS NOT BLANK IS UPPERCASE, IS UPPER CASE, IS UPPER IS NOT UPPERCASE, IS NOT UPPER CASE, IS NOT UPPER IS LOWERCASE, IS LOWER CASE, IS LOWER IS NOT LOWERCASE, IS NOT LOWER CASE, IS NOT LOWER IS WORD
Any (*) Any (*) Any (*) Any (*) Any (*)
Yes (true) Yes (true) Yes (false) No No
Any (*) Any (*) Any (*)
No No Yes (false)
IS NOT WORD
Any (*)
Yes (true)
N = number D = date * = takes value of the toString() method
Valang can test any value either String, number, Boolean, and date literals or property values of any type. See Listing 9-9. Listing 9-9. Examples of Literal Values in Valang 'a string example, next is a number example and after that a date example' -10.5 [2005-07-30]
CHAPTER 9 VALIDATION
Internally Valang converts property number values to java.math.BigDecimal, while BigDecimal also parses number literals. Valang s internal date parser parses date literals that allow for powerful date constructs. Valang uses org.springframework.beans.BeanWrapperImpl to read property values. The property notation constructs of this class are supported in Valang. They include simple properties, nested properties, and access to List elements and Map entries. See Listing 9-10. Listing 9-10. Example of Property Accessors in Valang name address.location customers[0].name salesParameters[seasonStartDate] When accessing Map entries keys are expected to be Strings. Since BeanWrapperImpl s notation is reused in Valang the String values that represent key values are not quoted. Valang supports mathematical expressions that can contain literal values of bean property values. Parentheses support proper mathematical prevailing. Valang considers the result of mathematical expressions like the example in Listing 9-11 as values that can be tested. Listing 9-11. Example of Mathematical Expressions in Valang ((10 - (5 + -3)) * (salesParameters[reduction] mod 3)) div 13 Supported mathematical operators are + * / or div % or mod Date literals deserve special attention when discussing Valang. They are always encapsulated in square brackets ( [ and ] ). Valang s internal date parser recognizes a limited number of date formats, but you can add your own formats. Its date operators are the real power of the Valang date parser. Suppose we want to test if a date is today. It would be fairly trivial to write this in Java code, but it becomes more challenging when you have to provide a date value to test a property value in a validation language notation. To start discovering the functionalities of the Valang date parser we introduce the T construct. T represents the current time, comparable to creating a new java.util.Date() instance. To test whether the value of the order timestamp property is earlier than the current timestamp with Valang, we use the constraint in Listing 9-12. Listing 9-12. Example of Using T As a Date Literal in Valang { order.timestamp : < [T] : '' : 'order.timestamp.in_past' }
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