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Implementing Business Service Validation
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You can now go into the CustomersImpl class and add the following code to the validation method:
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public boolean validateCustomers() { String job = (String)getEmployees().getAttribute("JobId"); if (getIncomeLevel().equalsIgnoreCase("L: 300,000 and above") && !job.equals("AD_PRES")) { return false; } return true; }
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The code uses the accessor to the Employees entity object to find JobId and ensure for high-income customers that the associated account manager, as identified in the Employees entity object, is a president. NOTe In the preceding code, getEmployees() returns an EntityImpl object and getAttribute() is called on that object. However, if you have generated an EmployeesImpl class, then you could cast the EntityImpl object to EmployeesImpl and then call getJobId() on that object.
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Congratulations! You ve now completed building your business services, although there is nothing to stop you from going back to fine-tune the details as you start assembling your application UI. Having completed this chapter, you should understand more about ADF Business Components validation and how: Validation rules are defined on entity objects. Validation failure can be treated as an error or as a warning. Validation messages can be parameterized. Comparison validators can compare against static values, expressions, and attribute values that are not part of the entity object. List validators can validate against static lists, queries, and view object instances. Data input can be validated to ensure it matches a specific pattern. Groovy can be used to evaluate more complex validation conditions. A Java method can be called as a validator.
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With your business service development complete, the following chapters involve changing hats and becoming the developer who has to build the page flow and lay out the pages that interface into the business service.
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ChaPter
Introduction to ADF Faces Rich Client
Quick Start Guide to Oracle Fusion Development
ow that you have built your business service, the focus of the book changes to how you can expose that business service to the end user. It can often be the aesthetic qualities and ease of use that shape a user s perceptions of an application, so it s important that the UI technologies not only are productive for the developer, but also can meet the expectations of the end user.
In this chapter you will be introduced to ADF Faces Rich Client and the library of components available for building your UI pages. NOTe The terms ADF Faces and ADF Faces Rich Client are often used interchangeably. Strictly speaking, ADF Faces is the name used to refer to the UI components in Oracle ADF 10g, with ADF Faces Rich Client being used to distinguish the visually and functionally richer components in Oracle ADF 11g; however, the term ADF Faces is now generally used for the Oracle ADF 11g component set. For the purposes of this book, when ADF Faces is mentioned, it refers to the Oracle ADF Faces Rich Client 11g components unless explicitly noted otherwise.
An Overview of ADF Faces
As you found out earlier in the book, Java Server Faces (JSF) is a standard for building web UIs. One of the advantages of JSF is that, as a developer, you are working with components, each of which compartmentalizes its behavior and how it renders itself. This means that as the developer using, for example, a JSF table component, you are protected from the implementation details of how that component handles the event processing when data is changed in the table or if a scroll bar is moved. Furthermore, how that table renders is handled by the component itself. It might generate HTML and JavaScript for rendering in a browser, but generate different markup if the component is being rendered on a handheld device like a mobile phone. NOTe There is also an element of future-proofing in using JSF components like ADF Faces. If, for example, some new markup language is invented for displaying web pages or a new browser comes on the market, the component developer would be responsible for handling the differences in the browser versions or rendering of the new markup. As the consumer of the component, you can expect the component to do the right thing when it comes to rendering. Because JSF is a standard, different vendors can develop their own JSF-compliant components, with ADF Faces being Oracle s offering of JSF components within Oracle ADF. The infrastructure supports not only the visual UI components you would expect, like buttons and input fields, but also features like drag and drop, popup dialogs, and page templates.
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