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Quick Start Guide to Oracle Fusion Development
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Rather than having validation messages that are static strings, ADF Business Components allows you to parameterize these messages using tokens that can refer to attribute values and properties that are resolved at runtime. For example, instead of defining a static error message That credit limit is too high, you could define the message You cannot set a credit limit of {x} for {first} {last}, which at runtime gets resolved to the more helpful You cannot set a credit limit of 5000 for Constantine Welles. In this case {x}, {first}, and {last} are simply tokens in the message, each of which can refer to an attribute name or a Groovy expression.
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In this case, newValue refers to the new value of CreditLimit rather than the value the user was trying to change, while CustFirstName and CustLastName are attribute values.
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The term Groovy has appeared a number of times in the book so far. So, what is Groovy Well, Groovy is a Java-like scripting notation that runs inside a JVM and has access to all the Java APIs, any custom classes and methods you write, as well as a few APIs of its own. Also, because it is interpreted at runtime, rather than being compiled, it can be customized on an application-to-application basis. But hold on, aren t we supposed to be coding in Java Yes, you are and yes, you will be. Nevertheless, ADF Business Components has a number of hooks into which you add Groovy expressions that give you the flexibility to write code without dropping into full-blown Java. This works particularly well with numerous features of ADF Business Components, including validation and default values where Groovy expressions can be used to provide conditional processing or values derived from expressions. For more information, search online for the Oracle White Paper Introduction to Groovy Support in JDeveloper and Oracle ADF 11g written by Grant Ronald.
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Probably the most common validation rule you will choose to implement is one that compares a new attribute value to a specific value. The compare validator allows you to define that the value you are comparing against is a literal value or one that is derived at runtime from an expression, query, or another attribute.
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Quick Start Guide to Oracle Fusion Development
Comparing an Attribute Against a Literal Value
The simplest case is comparing an attribute to a literal value. Create a new validation rule on the Salary attribute of the Employees entity object. Set Rule Type to Compare, Operator to LessThan, and Compare With to Literal Value. For Enter Literal Value, enter 25000.
You have just defined that the salary for an employee must be less than the literal value 25000. You can also define a message to be displayed. TIp For each validation rule that you define, make sure you test it in the ADF Business Component Browser to ensure that it works as expected.
Comparing an Attribute Against an expression
Rather than validating against a static value, you could validate against an expression. For example, a date of birth or an order date can t be in the future, but you can t hard-code the current date into your validation rule. In this case, you can define a validation rule to compare against an expression.
9:
Implementing Business Service Validation
On the Customers entity object, add a new validation rule to DateOfBirth. Set Rule Type to Compare, Operator to LessThan, and Compare With to Expression. Enter adf.currentDate into Expression. The value adf.currentDate is a built-in Groovy expression that returns the current date.
Comparing an Attribute Against an Attribute Value
But what if you want to compare against an attribute value defined somewhere else in your business service For example, the selling price for an order item should never be less than the minimum price for that item. That requires you to look up the minimum price for the item and use that as part of the validation rule. You could select the minimum price for an item via a database query, but that involves a trip to the database and you wouldn t find any changes that are still a part of the current transaction.
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