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partial shared state that should not be accessed on its own without the additional state that its entity subclasses add to it. If you are not sure whether to make a class an entity or a mapped superclass, then you need only ask yourself if you will ever need to query across or access an instance that is only exposed as an instance of that mapped class. This also includes relationships, since a mapped superclass can t be used as the target of a relationship. If you answer yes to any variant of that question, then you should probably make it a first-class entity. If we look back at Figure 10-10, we could conceivably treat the CompanyEmployee class as a mapped superclass instead of an entity. It defines shared state, but perhaps we have no reason to query over it. A class is indicated as being a mapped superclass by annotating it with the @MappedSuperclass annotation. The class fragments from Listing 10-27 show how the hierarchy would be mapped with CompanyEmployee as a mapped superclass. Listing 10-27. Entities Inheriting from a Mapped Superclass @Entity public class Employee { @Id private int id; private String name; @Temporal(TemporalType.DATE) @Column(name="S_DATE") private Date startDate; // ... } @Entity public class ContractEmployee extends Employee { @Column(name="D_RATE") private int dailyRate; private int term; // ... } @MappedSuperclass public abstract class CompanyEmployee extends Employee { private int vacation; // ... } @Entity public class FullTimeEmployee extends CompanyEmployee { private long salary; private long pension; // ... } @Entity public class PartTimeEmployee extends CompanyEmployee { @Column(name="H_RATE") private float hourlyRate; // ... }

The J2ME Polish GUI can use the complete screen on MIDP 2.0 devices as well as on MIDP 1.0 devices that provide proprietary methods for using a full-screen mode. You can activate the full-screen mode with the fullscreen attribute of the <build> element, as shown in Listing 12-3. The attribute can have the values yes/true, no/false, or menu. When the application uses commands, you must use the menu mode. In that case, the menu bar will be rendered by J2ME Polish, and the menu can be designed with CSS (for example, by setting the menubar-color attribute or using the menu style). Alternatively, you can set the polish.FullScreen preprocessing variable, which accepts the same values as the fullscreen attribute. With this mechanism, you can fine-tune the setting for different devices. Siemens devices, for example, accept commands even in the normal full-screen mode, so there is no need to use the menu mode for such devices. Listing 12-3 demonstrates this. Listing 12-3. Enabling the Full-Screen Mode <j2mepolish> <info license="GPL" name="Roadrunner" vendorName="A reader." version="0.0.1" jarName="${polish.vendor}-${polish.name}-roadrunner.jar" /> <deviceRequirements> <requirement name="Identifier" value="Generic/midp1" /> </deviceRequirements> <build usePolishGui="true" fullscreen="menu" > <midlet class="com.apress.roadrunner.Roadrunner" /> <variables> <!-- Use the normal fullscreen for Siemens devices --> <variable name="polish.FullScreen" value="true" if="polish.vendor == Siemens" /> </variables> </build> <emulator /> </j2mepolish> Some MIDP 2.0 devices do not support the menu mode, since they do not forward key events when a soft key is pressed. J2ME Polish determines whether a device supports the menu mode by evaluating the device database. When the hasCommandKeyEvents feature is set, the device supports the pure MIDP 2.0 menu mode. Additionally, you can set the capabilities

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