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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.ui;
import java.util.HashMap;
import java.util.Map;
import com.vaadin.external.json.JSONArray;
import com.vaadin.external.json.JSONException;
import com.vaadin.terminal.AbstractExtension;
import com.vaadin.terminal.Extension;
import com.vaadin.terminal.gwt.client.communication.ServerRpc;
import com.vaadin.terminal.gwt.client.extensions.javascriptmanager.ExecuteJavaScriptRpc;
import com.vaadin.terminal.gwt.client.extensions.javascriptmanager.JavascriptManagerState;
public class JavaScript extends AbstractExtension {
private Map<String, JavascriptCallback> callbacks = new HashMap<String, JavascriptCallback>();
// Can not be defined in client package as this JSONArray is not available
// in GWT
public interface JavascriptCallbackRpc extends ServerRpc {
public void call(String name, JSONArray arguments);
}
public JavaScript() {
registerRpc(new JavascriptCallbackRpc() {
public void call(String name, JSONArray arguments) {
JavascriptCallback callback = callbacks.get(name);
// TODO handle situation if name is not registered
try {
callback.call(arguments);
} catch (JSONException e) {
throw new IllegalArgumentException(e);
}
}
});
}
@Override
public JavascriptManagerState getState() {
return (JavascriptManagerState) super.getState();
}
public void addCallback(String name, JavascriptCallback callback) {
callbacks.put(name, callback);
if (getState().getNames().add(name)) {
requestRepaint();
}
}
public void removeCallback(String name) {
callbacks.remove(name);
if (getState().getNames().remove(name)) {
requestRepaint();
}
}
public void execute(String script) {
getRpcProxy(ExecuteJavaScriptRpc.class).executeJavaScript(script);
}
public static JavaScript getCurrent() {
return Root.getCurrentRoot().getJavaScript();
}
private static JavaScript getJavascript(Root root) {
// TODO Add caching to avoid iterating collection every time
// Caching should use weak references to avoid memory leaks -> cache
// should be transient to avoid serialization problems
for (Extension extension : root.getExtensions()) {
if (extension instanceof JavaScript) {
return (JavaScript) extension;
}
}
// Extend root if it isn't yet done
JavaScript javascript = new JavaScript();
javascript.extend(root);
return javascript;
}
}
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