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private static final ImageCache imageCache = new ImageCache(); public String getId() { return id; } public String getName() { return name; } public Image getImage() { return imageCachegetImage(getImageDescriptor()); } public ImageDescriptor getImageDescriptor() { if (imageDescriptor != null) return imageDescriptor; String iconName = configElementgetAttribute(ATT_ICON); if (iconName == null) return null; IExtension extension = configElementgetDeclaringExtension(); String extendingPluginId = extensiongetNamespaceIdentifier(); imageDescriptor = AbstractUIPluginimageDescriptorFromPlugin( extendingPluginId, iconName); return imageDescriptor; }

The loadFavorite(String) and newFavorite(Object) methods are redirected to the factory object as specified in the extension Since instantiating the factory object involves loading the plug-in that contains it, this operation is deferred until needed The targetClassName is used by the newFavorite(Object) method to determine whether the associated factory can handle the specified object and thus whether the associated factory needs to be loaded The code that instantiates the factory object is wrapped in an exception handler so that detailed information can be logged concerning the failure that occurred and which plug-in and extension are involved

#include <iostream> #include <string> int main() { // ask for the person's name std::cout << "Please enter your first name: "; // read the name std::string name; std::cin >> name;

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public IFavoriteItem newFavorite(Object obj) { if (!isTarget(obj)) { return null; } FavoriteItemFactory factory = getFactory(); if (factory == null) { return null; } return factorynewFavorite(this, obj); } private boolean isTarget(Object obj) { if (obj == null) { return false; } Class< > clazz = objgetClass(); if (clazzgetName()equals(targetClassName)) { return true; } Class< >[] interfaces = clazzgetInterfaces(); for (int i = 0; i < interfaceslength; i++) { if (interfaces[i]getName()equals(targetClassName)) { return true; } } return false; } public IFavoriteItem loadFavorite(String info) { FavoriteItemFactory factory = getFactory(); if (factory == null) { return null; } return factoryloadFavorite(this, info); } private FavoriteItemFactory getFactory() { if (factory != null) { return factory; } try { factory = (FavoriteItemFactory) configElement createExecutableExtension(ATT_CLASS); } catch (Exception e) { FavoritesLoglogError( "Failed to instantiate factory: " + configElementgetAttribute(ATT_CLASS) + " in type: " + id + " in plugin: " + configElementgetDeclaringExtension() getNamespaceIdentifier(),e); } return factory; }

// build the message that we intend to write const std::string greeting = "Hello, " + name + "!"; // we have to rewrite this part return 0; }

Tip: Whenever instantiating an object specified in an extension, always use the IConfigurationElementcreateExecutable(String) method This method automatically handles references from extensions in one plug-in s manifest to code located in another plug-in s runtime library as well as various forms of post-instantiation initialization specified in the extension (see Section 215, Types Specified in an Extension Point, on page 793) If you use ClassforName(String), then you will only be able to instantiate objects already known to your plug-in because ClassforName(String) uses your plug-in s class loader and thus will only instantiate objects in your plug-in s classpath (see Section 219, Plug-in ClassLoaders, on page 811 for more on class loaders)

Effective Java: Programming Language Guide // Broken - results in shared internal state! public Object clone() throws CloneNotSupportedException { HashTable result = (HashTable) superclone(); resultbuckets = (Entry[]) bucketsclone(); return result; }

The new factory type is an abstract base class that must be extended by other plug-ins providing new types of Favorites objects See the Tip in Section 1723, Extension point elements and attributes, on page 643 for a discussion of interface versus abstract base class The factory type includes a concrete dispose method so that subclasses can perform cleanup if necessary, but are not required to implement this method if cleanup is not needed

As we rewrite the part of the program that the we have to rewrite this part comment represents, we shall already be in a context that defines name, greeting, and the relevant names from the standard library We will build up the new version of the program a piece at a time, and then, in 254/29, we'll put all the pieces together

package comqualityeclipsefavoritesmodel; public abstract class FavoriteItemFactory { public abstract IFavoriteItem newFavorite( FavoriteItemType type, Object obj); public abstract IFavoriteItem loadFavorite( FavoriteItemType type, String info); public void dispose() { // Nothing to do subclasses may override } }

When the plug-in shuts down, you must dispose of all cached images and give each of the factory objects an opportunity to clean up Add the methods, disposeTypes() and dispose(), to the FavoriteItemType Modify the FavoritesActivator stop() method to call this new disposeTypes() method

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