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Generally the first step of any large project, data modeling, consists of deciding what data the system will need to maintain, how this data will be represented, and how it interrelates Traditionally, such modeling takes place in the context of a database, discussed in 6 For current purposes, however, it is reasonable to model everything in terms of beans As there is not yet anywhere to store all the data, the examples in this chapter use beans in which the data has been hard-coded, although this is never a good idea in real-world projects Even when prototyping a system, it is better to use a small, simple database However, this little cheat will not significantly change the way the pages work, so it will suffice for now Java News Today has already identified a few beans it will need In 3, JNT developed the QuizBean, which holds the question, options, and correct answer for the daily quiz, and created a UserInfoBean to hold users' preferences for colors, as well as a name At this time, JNT is ready to consider allowing users to register on the site, in order to store their preferences permanently This will necessitate adding some logic to the UserInfoBean in order to handle logging users on the system The fields added will be username, password, and isLoggedIn, a flag that will be true if the user is currently logged in and false otherwise In addition to users and quizzes, the other major entities behind the JNT site are articles An ArticleBean will hold the text of the story, a headline, and a date and time of publication Each ArticleBean will also have a unique numeric identifier to identify and load that story As with a physical newspaper, articles will be grouped into major sections covering broad categories, such as J2EE, the Java community, related technologies, and so on Each.

public void setIncreasingAlphaDuration(long increasingAlphaDuration) public long getIncreasingAlphaDuration()

All control point coordinates are expressed in the shading s target coordinate space These are followed by the color values for the four corners of the patch, in the same order as the corners themselves If the patch s edge ag f is 0, all 16 control points and four corner colors must be explicitly speci ed in the data stream; if f is 1, 2, or 3, the control points and colors for the patch s shared edge are implicitly understood to be the same as those along the speci ed edge of the previous patch, and are not repeated in the data stream Table 433 summarizes the data values for various values of the edge ag f, expressed in terms of the row and column indices used in Figure 424 above

public void setIncreasingAlphaRampDuration(long increasingAlphaRampDuration) public long getIncreasingAlphaRampDuration()

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Instead of simply jumping to a destination in the document, an annotation or outline item can specify an action (PDF 11) for the viewer application to perform, such as launching an application, playing a sound, or changing an annotation s appearance state The optional A entry in the annotation or outline item dictionary (see Tables 810 on page 490 and 84 on page 478) speci es an action to be performed when the annotation or outline item is activated; in PDF 12, a variety of other circumstances may trigger an action as well (see Section 852, Trigger Events ) In addition, the optional OpenAction entry in a document s catalog (Section 361, Document Catalog ) may specify an action to be performed when the document is opened PDF includes a wide variety of standard action types, described in detail in Section 853, Action Types

section will have a name and a description and will also keep track of all the articles it contains This containment will be managed by creating a SectionBean and giving each instance of SectionBean an array of ArticleBean instances This should immediately suggest the use of the jsp:forEach tag to display all the stories in a section, and indeed such a page will be on the site This illustrates how the data-modeling phase of a project can inspire and affect the page-designing phase Similarly, sections will be grouped into an edition At the moment, an edition will have only an array of sections; later, its role will be expanded to manage many of the personalization options Java News Today will offer Finally, in order to make this a community site, the staff at Java News Today would like to allow users to add comments to stories Some sites, notably http://wwwslashdotorg, provide very sophisticated commenting systems that can include threaded discussions, moderation of comments, and a whole host of other features For the moment, JNT will allow only a simple "flat" commenting system, whereby comments simply appear in the reverse order they were added This suggests the need for a CommentBean and an array of such beans held by each ArticleBean Figure 51 shows a sample of beans as they might exist in memory and their relationships to one another Figure 51 The JNT beans

By default, Java 3D coordinate systems are right-handed, with the orientation semantics being that +Y is the local gravitational up, +X is horizontal to the right, and +Z is directly toward the viewer The default units are meters

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