advertisementfactory.java

来自「JXTA&#8482 is a set of open, generalize」· Java 代码 · 共 402 行 · 第 1/2 页

        // our key is the doctype names.
        return java.lang.String.class;
    }
    
    /**
     *  {@inheritDoc}
     */
    @Override
    protected boolean registerAssoc(String className) {
        boolean registeredSomething = false;
        
        try {
            Class advClass = Class.forName(className + "$Instantiator");
            
            Instantiator instantiator = (Instantiator) advClass.newInstance();
            
            String advType = instantiator.getAdvertisementType();
            
            registeredSomething = registerAdvertisementInstance(advType, instantiator);
        } catch (Exception all) {
            if (Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
                LOG.log(Level.FINE, "Failed to register \'" + className + "\'", all);
            }
        }
        
        return registeredSomething;
    }
    
    /**
     *  Register an instantiator for and advertisement type to allow instances
     *  of that type to be created.
     *
     *  @param rootType  the identifying value for this advertisement instance
     *   type.
     *  @param instantiator the instantiator to use in constructing objects
     *   of this rootType.
     *  @return boolean  true if the rootType type is registered. If there is
     *   already a constructor for this type then false will be returned.
     */
    public static boolean registerAdvertisementInstance(String rootType, Instantiator instantiator) {
        boolean result = factory.registerAssoc(rootType, instantiator);
        
        return result;
    }
    
    /**
     * Constructs a new instance of {@link Advertisement} matching the type
     * specified by the {@code advertisementType} parameter.
     *
     * @param advertisementType Specifies the type of advertisement to create.
     * @return The instance of {@link Advertisement}.
     * @throws NoSuchElementException if there is no matching advertisement type.
     */
    public static Advertisement newAdvertisement(String advertisementType) {
        factory.loadProviders();
        
        Instantiator instantiator = factory.getInstantiator(advertisementType);
        
        Advertisement a = instantiator.newInstance();
        
        return a;
    }
    
    /**
     * Constructs an instance of {@link Advertisement} from the provided
     * <code>InputStream</code>. The content type of the stream is declared via
     * the <code>mimetype</code> parameter.
     *
     * @deprecated Please convert your code to construct an {@code XMLDocument}
     * using {@code StructuredDocumentFactory} and then call 
     * {@link AdvertisementFactory#newAdvertisement(XMLElement)}. For example :
     * <p/><pre>
     *   XMLDocument xml = (XMLDocument) StructuredDocumentFactory.newStructuredDocument( MimeMediaType.XMLUTF8, is );
     * </pre>
     * <b>or frequently:</b>
     * <p/><pre>
     *   XMLDocument xml = (XMLDocument) StructuredDocumentFactory.newStructuredDocument( msgElement );
     * </pre>
     * <b>followed by:</b>
     * <p/><pre>
     *   Advertisement adv = AdvertisementFactory.newAdvertisement(xml);
     * </pre>
     *
     * @param mimetype Specifies the mime media type of the stream being read.
     * @param stream input stream used to read data to construct the advertisement
     * @return The instance of {@link Advertisement}
     * @throws IOException error reading message from input stream
     * @throws NoSuchElementException if there is no matching advertisement type
     * for the type of document read in.
     */
    @Deprecated
    public static Advertisement newAdvertisement(MimeMediaType mimetype, InputStream stream) throws IOException {
        StructuredDocument doc = StructuredDocumentFactory.newStructuredDocument(mimetype, stream);
        
        if (!(doc instanceof XMLDocument)) {
            throw new IllegalArgumentException("Advertisements must be XML");
        }
        
        return newAdvertisement((XMLDocument) doc);
    }
    
    /**
     * Reconstructs an instance of {@link Advertisement} from the provided
     * <code>Reader</code>. The content type of the reader is declared via the
     * <code>mimetype</code> parameter.
     *
     * @deprecated Please convert your code to construct an {@code XMLDocument}
     * using {@code StructuredDocumentFactory} and then call 
     * {@link AdvertisementFactory#newAdvertisement(XMLElement)}. For example :
     * <p/><pre>
     *   XMLDocument xml = (XMLDocument) StructuredDocumentFactory.newStructuredDocument( MimeMediaType.XMLUTF8, reader );
     * </pre>
     * <b>or frequently:</b>
     * <p/><pre>
     *   XMLDocument xml = (XMLDocument) StructuredDocumentFactory.newStructuredDocument( msgElement );
     * </pre>
     * <b>followed by:</b>
     * <p/><pre>
     *   Advertisement adv = AdvertisementFactory.newAdvertisement(xml);
     * </pre>
     *
     * @param mimetype Specifies the mime media type of the stream being read.
     * @param source used to read data to construct the advertisement.
     * @return The instance of {@link Advertisement}
     * @throws IOException error reading message from input stream
     * @throws NoSuchElementException if there is no matching advertisement type
     * for the type of document read in.
     * @throws UnsupportedOperationException if the specified mime type is not
     *  associated with a text oriented document type.
     */
    @Deprecated
    public static Advertisement newAdvertisement(MimeMediaType mimetype, Reader source) throws IOException {
        StructuredTextDocument doc = (StructuredTextDocument) StructuredDocumentFactory.newStructuredDocument(mimetype, source);
        
        return newAdvertisement(doc);
    }
    
    /**
     * Reconstructs an instance of {@link Advertisement} matching the type
     * specified by the {@code root} parameter.
     *
     * @deprecated Advertisements must be encoded in XML. This is a legacy
     * static constructor. You should convert your code to use the 
     * {@link AdvertisementFactory#newAdvertisement(XMLElement) XMLElement}
     * version.
     *
     * @param root Specifies a portion of a StructuredDocument which will be
     * converted into an Advertisement.
     * @return The instance of {@link Advertisement}.
     * @throws NoSuchElementException if there is no advertisement type
     * matching the type of the root node.
     */
    @Deprecated
    public static Advertisement newAdvertisement(TextElement root) {
        if (!(root instanceof XMLElement)) {
            throw new IllegalArgumentException("Advertisements must be XML");
        }
        
        return newAdvertisement((XMLElement) root);
    }

    /**
     * Reconstructs an instance of {@link Advertisement} matching the type
     * specified by the {@code root} parameter.
     *
     * @param root Specifies a portion of an XMLElement which will be
     * converted into an Advertisement.
     * @return The instance of {@link Advertisement}.
     * @throws NoSuchElementException if there is no advertisement type
     * matching the type of the root node.
     */
    public static Advertisement newAdvertisement(XMLElement root) {
        factory.loadProviders();
        
        Instantiator instantiator = null;
        
        // The base type of the advertisement may be overridden by a type
        // declaration. If this is the case, then we try to use that as the
        // key rather than the root name.
        Attribute type = root.getAttribute("type");

        if (null != type) {
            try {
                instantiator = factory.getInstantiator(type.getValue());
            } catch (NoSuchElementException notThere) {
                // do nothing, its not fatal
                ;
            }
        }
        
        // Don't have an instantiator for the type attribute, try the root name
        if (null == instantiator) {
            instantiator = factory.getInstantiator(root.getName());
        }
        
        Advertisement a = instantiator.newInstance(root);
        
        return a;
    }
}