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Getter methods for Boolean properties may begin with is instead of get You can choose how the state of an instance of your persistent classes should be persisted by Hibernate, either through direct access to its fields or through accessor methods Your class design isn t disturbed by these considerations You can make some accessor methods nonpublic or completely remove them Some getter and setter methods do something more sophisticated than access instance variables (validation, for example), but trivial accessor methods are common Their primary advantage is providing an additional buffer between the internal representation and the public interface of the class, allowing independent refactoring of both The example in listing 31 also defines a business method that calculates the cost of shipping an item to a particular user (we left out the implementation of this method)..

Two views are left to create for the Tasks list: Completed Issues and High Priority Issues. These views will be accessed from the Tasks list, not the home page. After creating the views, there are two more tasks to complete before launch: have Brian add an announcement about the purpose of the site, and add the stakeholders as read-only users. The completed SharePoint site shown in Figure 7-10 provides a complete issue tracking solution for Brian and the COS team.

C:\>net user jan User name Full Name Comment User s comment Country code Account active Account expires

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<day id="5" optional="true">XML Interoperability</day> </days> </class> As you can see, the file describes a class through its modules and topics covered The general information about the class (title, author, training company) are written using attributes Each module spans a full day, and its description is implemented using plain text Any XML document that must be validated against a given DTD file includes a DOCTYPE tag through which it simply links to the DTD of choice, as shown here: <!DOCTYPE class SYSTEM "classdtd"> The word following DOCTYPE identifies the metalanguage described by the DTD This information is extremely important for the validation process If that word the document type name does not match the root element of the DTD, a validation error is raised The text following the SYSTEM attribute is the URL from which the DTD will actually be downloaded.

interval. A single-action timer expires once, and an interval timer expires many times, at specified intervals. When a timer expires, the Timer Service calls the bean s ejbTime out() method or a callback method with @javax.ejb.Timeout. At this point, we are discussing only the expiration and duration parameters and their uses. The Serializable info parameter is discussed later in this chapter. When a timer is created, the Timer Service makes it persistent in some type of secondary storage, so it will survive system failures. If the server goes down, the timers are still active when the server comes back up. Although the specification isn t clear, it s assumed that any timers that expire while the system is down will go off when it comes back up again. If an interval timer expires many times while the server is down, it may go off multiple times when the system comes up again. Consult your vendor s documentation to learn how they handle expired timers following a system failure. The TimerService.getTimers() method returns all the timers that have been set for a particular enterprise bean. The getTimers() method returns a java.util.Collection, an unordered collection of zero or more javax.ejb.Timer objects. Each Timer object represents a different timed event that has been scheduled for the bean using the Timer Service. The getTimers() method is often used to manage existing timers. A bean can look through the Collection of Timer objects and cancel any timers that are no longer valid or need to be rescheduled.

The following listing demonstrates a DTD that is tailor-made for the preceding XML document: <!ELEMENT class (days)> <!ATTLIST class title CDATA #REQUIRED author CDATA #IMPLIED company CDATA #IMPLIED> <!ENTITY % Boolean "true | false"> <!ELEMENT days (day*)> <!ATTLIST days total CDATA #REQUIRED expandable (%Boolean;) #REQUIRED> <!ELEMENT day (#PCDATA)> <!ATTLIST day id CDATA #REQUIRED optional (%Boolean;) #IMPLIED> The ELEMENT tag identifies a node element, whereas ATTLIST is the tag that groups all attributes of a given node Attributes are normally expressed through CDATA sections that contain unparsed data In some cases, however, they can be allowed to take only the values defined by the specified entity This is the case for the expandable attribute, whose only permitted values are true and false In the section "Further Reading," on page 133, you'll find references for learning more about the DTD syntax.

What first catches the eye about DTDs is that they are written in a proprietary language that only mimics the typical markup of XML Validating Against a DTD The following code snippet creates an XmlValidatingReader object that works on the sample XML file data_dtdxml discussed in the section "Developing a DTD Grammar," on page 97 The document is bound to a DTD file and is validated using the DTD validation type 79.

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