vb.net free barcode dll Implementing Business Service Validation in Java

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Implementing Business Service Validation
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Another useful feature of the validation framework is the ability to validate input against a particular pattern; for example, a membership number should always be two alphabetical characters followed by ten numeric digits. ADF Business Components allows you to define a validation rule that uses something called a Java regular expression to define the data pattern. This is simply a string that defines what characters and symbols are allowed for a specific piece of data. For example, a Java regular expression [A-Z][a-z]{0,10} defines that a piece of data should have an initial uppercase letter followed by up to ten lowercase alphabetical characters. JDeveloper already provides some prebuilt expressions that handle U.S. telephone numbers and e-mail addresses, and there are numerous other examples of expressions posted online. TIp Searching the Web for java.util.regex.Pattern is probably a good place to start to find out more information about regular expressions.
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Creating a Regular expression Validator
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Open the entity object editor for Customers and create a new validation rule for CustEmail. Set Rule Type to Regular Expression, Operator to Matches, and Predefined Expressions to Email Address. Click Use Pattern, and JDeveloper displays a predefined pattern for an e-mail address. This prevents, for example, an e-mail address that does not contain the @ symbol.
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Script expression Validation
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You ve now seen that ADF Business Components provides some powerful declarative validation features, but what if you require a little more flexibility Script expression validation allows you to write a Groovy expression that returns either true or false to indicate whether the validation passed or failed. This gives you much more conditional control over your validation expression. For example, rather than validating credit limit against a single value, you might decide that the credit limit is based on the customer s income, and so if they have a higher income, then their credit limit is higher.
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Creating a Script expression Validator
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Given that this expression is going to be checking both credit limit and income, then it makes sense to place it at the entity level.
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Implementing Business Service Validation
Create a new entity-level validation rule and set Rule Type to Script Expression. For the Expression enter the following Groovy code:
// Debug lines to check values println(IncomeLevel) println(CreditLimit) //End of debug lines if (IncomeLevel == "A: Below 30,000") {return CreditLimit < 1000} else {if (IncomeLevel == "B: 30,000 - 49,999") {return CreditLimit < 2000} else return CreditLimit < 3000}
In this case the first two lines print out the values of the attributes that are being used in this validation rule. This is a useful technique to aid debugging, and you can view the values in the JDeveloper console window. The code then checks the value of IncomeLevel, and if the value is "A: Below 30,000" it evaluates whether CreditLimit is less than 1000. If the value of IncomeLevel is "B: 30,000 - 49,999" then CreditLimit must be less than 2000; otherwise CreditLimit must be less than 3000.
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Method Validation
Of course, not all validation requirements can be achieved by using only the declarative features of the framework. In such cases, Java gives you the power and flexibility in code to access and manipulate data structures to do pretty much anything you want. JDeveloper lets you write a validation rule in Java and indicate that that method should be called as part of the validation cycle. When creating a method validator, JDeveloper will automatically create an empty method in the appropriate Java class. So, for the Customers entity object the method will be created in the CustomersImpl class. The method should return either true, to indicate that the validation passed, or false, to indicate that the validation failed.
Creating a Method Validator
Let s assume that you want to define a more complex validation rule that high-income customers should have an account manager of an appropriately senior position. Create a new entity level validation rule and set Rule Type to Method. JDeveloper automatically suggests a method name, in this case validateCustomers().
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