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After the extension point has been defined, you must write the code behind it that builds Favorites item types and Favorites objects based on the information declared in extensions of the extension point Following the Eclipse theme of lazy initialization, you want to keep the memory footprint down, so each Favorites item type and plug-in containing it must be loaded only if necessary To achieve this, refactor portions of FavoriteItemType (see Section 1723, Extension point elements and attributes, on page 643) into a new FavoriteItemFactory and then reorganize FavoriteItemType to build types from extension information This is followed by recasting the Favorites item type constants as extensions to the new Favorites extension point

The first modification to FavoriteItemType involves building instances of this class from the extension information rather than hard-coding the information in the class as constants Rename the TYPES array to cachedTypes to more accurately represent the purpose of this static field Modify the getTypes() method to build a new instance of FavoriteItemType for each extension found

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Our new Student_info class is now quite different from the original Student_info structure from 4 Not surprisingly, using the class is different from using the original structure After all, our objective was to prevent users from being able to change our data values, which we accomplished by making them private Instead, we intend for users to write their programs in terms of the interface provided by our class As an example, we can rewrite our original main program from 45/70, which wrote the final grades for the students in a formatted report, to use this version of the class:

private static final String TAG_ITEMTYPE = "itemType"; private static FavoriteItemType[] cachedTypes; public static FavoriteItemType[] getTypes() { if (cachedTypes != null) return cachedTypes; IExtension[] extensions = PlatformgetExtensionRegistry() getExtensionPoint(FavoritesActivatorPLUGIN_ID, "favorites") getExtensions(); List<FavoriteItemType> found = new ArrayList<FavoriteItemType>(20); foundadd(UNKNOWN); for (int i = 0; i < extensionslength; i++) { IConfigurationElement[] configElements = extensions[i]getConfigurationElements(); for (int j = 0; j < configElementslength; j++) { FavoriteItemType proxy = parseType(configElements[j], foundsize()); if (proxy != null) foundadd(proxy); } } cachedTypes = (FavoriteItemType[]) foundtoArray( new FavoriteItemType[foundsize()]); return cachedTypes; } private static FavoriteItemType parseType( IConfigurationElement configElement, int ordinal ) { if (!configElementgetName()equals(TAG_ITEMTYPE)) return null; try { return new FavoriteItemType(configElement, ordinal); } catch (Exception e) { String name = configElementgetAttribute(ATT_NAME); if (name == null) name = "[missing name attribute]"; String msg = "Failed to load itemType named " + name + " in " + configElementgetDeclaringExtension() getNamespaceIdentifier(); FavoritesLoglogError(msg, e); return null; } }

Tip: As always, proper exception handling is necessary, especially when handling loosely coupled code via extension points In this case, the instance creation is wrapped in an exception handler so that an improperly declared extension will not cause this method to fail, but instead will generate a log entry containing enough information for the culprit to be tracked down and corrected

int main() { vector<Student_info> students; Student_info record; string::size_type maxlen = 0; // read and store the data while (recordread(cin)) { maxlen = max(maxlen, recordname()size()) studentspush_back(record); } // alphabetize the student records sort(studentsbegin(), studentsend(), compare); // write the names and grades for (vector<Student_info>::size_type i = 0; i != studentssize(); ++i) { cout << students[i]name() // changed << string(maxlen + 1 - students[i]namesize(), ' '); try { double final_grade = students[i]grade(); // changed streamsize prec = coutprecision(); cout << setprecision(3) << final_grade << setprecision(prec) << endl; } catch (domain_error e) { cout << ewhat() << endl; } } return 0; }

Note that the public class, Foo, has no finalizer (other than the trivial one that it inherits from Object), so it doesn't matter whether a subclass finalizer calls superfinalize or not This technique should be considered for every nonfinal public class that has a finalizer In summary, don't use finalizers except as a safety net or to terminate noncritical native resources In those rare instances where you do use a finalizer, remember to invoke superfinalize Last , if you need to associate a finalizer with a public, nonfinal class, consider using a finalizer guardian to ensure that the finalizer is executed, even if a subclass finalizer fails to invoke superfinalize

Next, you modify the FavoriteItemType constructor to extract the basic information from the extension without loading the plug-in that declared the extension This instance stands in as a proxy for the factory contained in the declaring plug-in If a required attribute is missing, then an IllegalArgumentException is thrown, to be caught in the exception handler of the parseType() method described earlier

// //

private private private private private private private private private private private private static static static static static final final final final final String String String String String ATT_ID = "id"; ATT_NAME = "name"; ATT_CLASS = "class"; ATT_TARGETCLASS = "targetClass"; ATT_ICON = "icon";

final IConfigurationElement configElement; final int ordinal; final String id; final String name; final String targetClassName; FavoriteItemFactory factory; ImageDescriptor imageDescriptor;

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