ko4j registers implementation of Transfer and WSTransfer based on XHR and WebSocket from a browser. The Java implementations of these interfaces has been moved to ko-ws-tyrus module. JavaScript arrays passed as parameters to Java callback methods need to be wrapped.
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43 package org.apidesign.html.boot.spi;
45 import java.io.Closeable;
46 import java.io.InputStream;
47 import java.io.InputStreamReader;
48 import java.io.Reader;
50 import java.util.HashMap;
51 import java.util.HashSet;
54 import java.util.concurrent.Executor;
55 import net.java.html.js.JavaScriptBody;
56 import org.netbeans.html.boot.impl.FnContext;
58 /** Represents single JavaScript function that can be invoked.
59 * Created via {@link Presenter#defineFn(java.lang.String, java.lang.String...)}.
61 * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
63 public abstract class Fn {
64 private final Presenter presenter;
67 * @deprecated Ineffective as of 0.6.
68 * Provide a presenter via {@link #Fn(org.apidesign.html.boot.spi.Fn.Presenter)}
76 /** Creates new function object and associates it with given presenter.
78 * @param presenter the browser presenter associated with this function
81 protected Fn(Presenter presenter) {
82 this.presenter = presenter;
85 /** True, if currently active presenter is the same as presenter this
86 * function has been created for via {@link #Fn(org.apidesign.html.boot.spi.Fn.Presenter)}.
88 * @return true, if proper presenter is used
90 public final boolean isValid() {
91 return FnContext.currentPresenter(false) == presenter;
94 /** Helper method to check if the provided instance is valid function.
95 * Checks if the parameter is non-null and if so, does {@link #isValid()}
98 * @param fnOrNull function or <code>null</code>
99 * @return true if the parameter is non-null and valid
102 public static boolean isValid(Fn fnOrNull) {
103 return fnOrNull != null && fnOrNull.isValid();
106 /** Helper method to find current presenter and ask it to define new
107 * function by calling {@link Presenter#defineFn(java.lang.String, java.lang.String...)}.
109 * @param caller the class who wishes to define the function
110 * @param code the body of the function (can reference <code>this</code> and <code>names</code> variables)
111 * @param names names of individual parameters
112 * @return the function object that can be {@link Fn#invoke(java.lang.Object, java.lang.Object...) invoked}
115 public static Fn define(Class<?> caller, String code, String... names) {
116 return FnContext.currentPresenter(false).defineFn(code, names);
119 private static final Map<String,Set<Presenter>> LOADED = new HashMap<String, Set<Presenter>>();
121 /** Wraps function to ensure that the script represented by <code>resource</code>
122 * gets loaded into the browser environment before the function <code>fn</code>
125 * @param fn original function to call
126 * @param caller the class who wishes to define/call the function
127 * @param resource resources (accessible via {@link ClassLoader#getResource(java.lang.String)})
128 * with a <em>JavaScript</em> that is supposed to loaded into the browser
130 * @return function that ensures the script is loaded and then delegates
134 public static Fn preload(final Fn fn, final Class<?> caller, final String resource) {
137 public Object invoke(Object thiz, Object... args) throws Exception {
138 final Presenter p = FnContext.currentPresenter(false);
139 Set<Presenter> there = LOADED.get(resource);
141 there = new HashSet<Presenter>();
142 LOADED.put(resource, there);
145 InputStream is = caller.getClassLoader().getResourceAsStream(resource);
147 InputStreamReader r = new InputStreamReader(is, "UTF-8");
153 return fn.invoke(thiz, args);
158 /** The currently active presenter.
160 * @return the currently active presenter or <code>null</code>
163 public static Presenter activePresenter() {
164 return FnContext.currentPresenter(false);
167 /** Activates given presenter. Used by the code generated by
168 * {@link JavaScriptBody} annotation:
170 * try ({@link Closeable} c = Fn.activate(presenter)) {
171 * doCallsInPresenterContext();
175 * @param p the presenter that should be active until closable is closed
176 * @return the closable to close
179 public static Closeable activate(Presenter p) {
180 return FnContext.activate(p);
183 /** Invokes the defined function with specified <code>this</code> and
184 * appropriate arguments.
186 * @param thiz the meaning of <code>this</code> inside of the JavaScript
187 * function - can be <code>null</code>
188 * @param args arguments for the function
189 * @return return value from the function
190 * @throws Exception if something goes wrong, as exception may be thrown
192 public abstract Object invoke(Object thiz, Object... args) throws Exception;
194 /** Provides the function implementation access to the presenter provided
195 * in {@link #Fn(org.apidesign.html.boot.spi.Fn.Presenter) the constructor).
197 * @return presenter passed in in the constructor (may be, but should not be <code>null</code>)
200 protected final Presenter presenter() {
204 /** The representation of a <em>presenter</em> - usually a browser window.
205 * Should be provided by a library included in the application and registered
206 * in <code>META-INF/services</code>, for example with
207 * <code>@ServiceProvider(service = Fn.Presenter.class)</code> annotation.
209 * Since 0.7 a presenter may implement {@link Executor} interface, in case
210 * it supports single threaded execution environment. The executor's
211 * {@link Executor#execute(java.lang.Runnable)} method is then supposed
212 * to invoke the runnable immediately (in case we are on the right thread
213 * already) or return and asynchronously invoke the runnable later on the
214 * right thread (if we are on wrong thread).
216 public interface Presenter {
217 /** Creates new function with given parameter names and provided body.
219 * @param code the body of the function. Can refer to variables named
220 * as <code>names</code>
221 * @param names names of parameters of the function - these will be
222 * available when the <code>code</code> body executes
224 * @return function that can be later invoked
226 public Fn defineFn(String code, String... names);
228 /** Opens the browser, loads provided page and when the
229 * page is ready, it calls back to the provider runnable.
231 * @param page the URL for the page to display
232 * @param onPageLoad callback when the page is ready
234 public void displayPage(URL page, Runnable onPageLoad);
236 /** Loads a script into the browser JavaScript interpreter and
238 * @param code the script to execute
239 * @throws Exception if something goes wrong, throw an exception
241 public void loadScript(Reader code) throws Exception;
244 /** Additional interface to be implemented by {@link Presenter}s that
245 * wish to control what objects are passed into the JavaScript virtual
248 * If a JavaScript engine makes callback to Java method that returns
249 * a value, the {@link #toJavaScript(java.lang.Object)} method is
250 * consulted to convert the Java value to something reasonable inside
253 * <em>Note:</em> The implementation based on <em>JavaFX</em> <code>WebView</code>
254 * uses this interface to convert Java arrays to JavaScript ones.
259 public interface ToJavaScript {
260 /** Convert a Java return value into some object suitable for
261 * JavaScript virtual machine.
263 * @param toReturn the Java object to be returned
264 * @return the replacement value to return instead
266 public Object toJavaScript(Object toReturn);
269 /** Additional interface to be implemented by {@link Presenter}s that
270 * need to convert JavaScript object (usually array) to Java object
271 * when calling back from JavaScript to Java.
273 * <em>Note:</em> The implementation based on <em>JavaFX</em>
274 * <code>WebView</code> uses this interface to convert JavaScript arrays to
279 public interface FromJavaScript {
280 /** Convert a JavaScript object into suitable Java representation
281 * before a Java method is called with this object as an argument.
283 * @param js the JavaScript object
284 * @return replacement object for
286 public Object toJava(Object js);