vb.net free barcode dll Setting an Attribute Value Depending on Another Attribute in Java

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Setting an Attribute Value Depending on Another Attribute
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A simple example of a situation in which you might add code to control an entity object is where you want to programmatically set the value of one attribute depending on the value of another attribute. For example, in the application built so far, if you change the product ID of an order item to be a different product, then the unit price of that line item is unchanged. It might be better to reset the price when the product ID is changed (to prevent the user from changing the order for a $2 box of pencils to an order for an executive oak desk and still being charged only $2 for it!). To implement the resetting of the price, generate the OrderItemsImpl class from the OrderItems entity object, ensuring that you choose to generate accessors. In the OrderItemsImpl class, you will find a method setProductId(). This is the method called whenever the value in the ProductId attribute is changed. To force the unit price of the order item to be reset, add the following code:
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public void setProductId(Number value) { setAttributeInternal(PRODUCTID, value); //Now set the unit price to null final Number newUnitPrice = null; setUnitPrice(newUnitPrice); }
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Common Business Service Coding Examples
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NOTE The new unit price is set after the call to setAttributeInternal(). This ensures that the new unit price is only set if the product ID is successfully changed. Also note that the call to setUnitPrice() takes a parameter of type oracle.jbo.domain.Number. This is a simple enough example, but the concept of setting an attribute as a result of the change to another attribute is one that you may use over and over again.
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Getting an Attribute Value from a Different Entity Object
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The solution provided in the preceding section doesn t exactly fit your requirement. Although it forces the unit price to be reset, the line total will now throw an exception since it is a calculation based on the unit price, which is being set to null. A better solution is to extend this example and set the unit price to the recommended list price for the product. But how can you programmatically access the list price, which is part of the ProductInformation entity object The answer is by using an association accessor. When you created the business service, JDeveloper created associations between some of the entity objects. You can go back and check the association that links the OrderItems and ProductInformation entity objects, as shown in Figure 18-1. This shows that OrderItems can access ProductInformation via an accessor, which also is called ProductInformation.
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Name of association accessor Available in this entity object
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FIGurE 18-1. Defining accessors in an association
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If you look at the OrderItemsImpl class, you will see a method getProductInformation(). This is the method that allows to you access the ProductInformation entity object. You can now change the code to
public void setProductId(Number value) { setAttributeInternal(PRODUCTID, value); //Now set the unit price to the list price ProductInformationImpl prodInfo = (ProductInformationImpl)getProductInformation(); final Number newUnitPrice = prodInfo.getListPrice(); setUnitPrice(newUnitPrice); }
TIp By also generating the ProductInformationImpl class and choosing to expose accessor methods, you can use the type-safe method getListPrice(), rather than calling getAttribute() defined on the EntityImpl class. This is a common example of where you need to access an attribute in a different entity object. The code will use the association accessor method, getProductInformation(), to access the ProductInformation entity object. You can then call any of the accessor methods on ProductInformationImpl to read attribute values.
Overriding the Deletion of an Order
Because the entity object is responsible for updating and deleting application data, you can place in an entity object class any code you require to augment or override that behavior. A common example of this is where, rather than deleting a row from the database, you want to set a flag to mark that the row is in a deleted state but still physically in the database. For example, suppose you decide that you want to maintain the history of all orders ever placed. That means that if a user attempts to delete an order, the status of the order should be set accordingly and the DML operation to delete the record from the database should be bypassed. NOTE 6 included a similar example but coded in the view object. By coding in the entity object, you are ensuring that this behavior is enforced for all possible view objects based on this entity object. To implement this use case, generate the OrdersImpl class from the Orders entity object and choose to expose accessors, DML operations, and the remove method.
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