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public abstract class Summary extends ActiveConferencePage implements IExternalPage { private static final int BLOG_ENTRIES = 2; private static final int FEATURED_PRESENTERS = 3; /** * This method is used when being activated from an external page. * This will load up the conference based on the conference id passed * setting it on the state object. */ public void activateExternalPage(java.lang.Object[] parameters, IRequestCycle cycle) { // get the id of the requested conference Integer conferenceId = (Integer)parameters[0]; // retrieve the conference Summary and stores it to the user information ConferenceSummary summary = retrieveConferenceSummary(conferenceId); // set the summary object on the user object LoggedInUser user = getUserInformation(); user.setConferenceSummary(summary); } private ConferenceSummary retrieveConferenceSummary(Integer id) { // Get the summary for a particular conference ConferenceSummary summary = getConferenceService().getConferenceSummary(id); // Get the featured speakers summary.setFeaturedSpeakers( getConferenceService(). getFeaturedPresenters(id, FEATURED_PRESENTERS) ); // get the news summary.setNews(getConferenceService().getNews(id));

A basic conversion specifier (as opposed to a full conversion specifier, which may contain a mapping key as well; see 4 for more information) consists of the items that follow. Note here that the order is crucial. The % character. This marks the beginning of the conversion specifier. Conversion flags (optional). These may be either -, indicating left alignment; +, indicating that a sign should precede the converted value; (a space character), indicating that a space should precede positive numbers; or 0, indicating that the conversion should be zero-padded. The minimum field width (optional). The converted string will be at least this wide. If this is an * (asterisk), the width will be read from the value tuple. A . (dot) followed by the precision (optional). If a real number is converted, this many decimals should be shown. If a string is converted, this number is that maximum field width. If this is an * (asterisk), the precision will be read from the value tuple. The conversion type (see Table 3-1).

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CH APT ER 6 JUST LI KE IT IS I N T HE REAL WO RLD !

Impedance Mismatch My Foot!

// also retrieve the blogs try { List<BlogEntry> blogEntries = getConferenceService() .getBlogEntries(id, BLOG_ENTRIES); setBlogEntries(blogEntries); } catch(Exception e) { // do nothing, this allows for development in // a machine without internet access } return summary; } /** * Return the relative URL for the image for the speaker using the presenter id. * @return String a relative URL to the speaker image */ public String getSpeakerImage() { return "../speakerImages/" + getSpeaker() .getPresenterId().toString() + ".jpg"; } public abstract PresenterSummary getSpeaker(); public abstract void setBlogEntries(List<BlogEntry> blogs); } The page definition file for the Summary page is responsible for declaring and formatting the components used in the HTML template. It uses For, Insert, and If components. It also uses the Any component. The Any component is a very versatile component that can emulate any HTML element. In the following example, the value of the OGNL expression speakerImage is bound to the attribute src of the surrounding tag. <component id="speakerPicture" type="Any"> <binding name="src" value="ognl:speakerImage"/> </component> The HTML snippet shown next uses an img tag with the speakerPicture component. At runtime, the src attribute will be replaced with the value of the speakerImage expression. <img jwcid="speakerPicture" border="0" src="../speakerImages/1.jpg"/> Figure 7-20 shows the Conference Summary page on the running application showing the conference with id equals to 1, which corresponds to the URL localhost:8080/TechConf/ app page=conference%2FSummary&service=external&sp=1.

The simple conversion, with only a conversion type, is really easy to use: >>> 'Price of eggs: $%d' % 42 'Price of eggs: $42' >>> 'Hexadecimal price of eggs: %x' % 42 'Hexadecimal price of eggs: 2a' >>> from math import pi >>> 'Pi: %f...' % pi 'Pi: 3.141593...' >>> 'Very inexact estimate of pi: %i' % pi 'Very inexact estimate of pi: 3' >>> 'Using str: %s' % 42L 'Using str: 42' >>> 'Using repr: %r' % 42L 'Using repr: 42L' For a list of all conversion types, see Table 3-1.

I argue that if done properly, there is little so-called mismatch between the classes used in an object-oriented language like Java and object-relational user-defined types in Oracle that is, if they both properly model the real world I have an entire section dedicated to the use of Java Database Connectivity (JDBC) and object-relational user-defined types in one of my previous books (Java Programming with Oracle JDBC) My 20 plus years of experience in both programming with object-oriented languages and using relational and now object-relational databases has led me to the conclusion that the mismatch is one of improper analysis vs the reality of the problem domain.