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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import com.vaadin.external.json.JSONArray;
import com.vaadin.external.json.JSONException;
import com.vaadin.tools.ReflectTools;
import com.vaadin.ui.JavascriptCallback;
import com.vaadin.ui.JavascriptManager.JavascriptCallbackRpc;
public class JavascriptRpcHelper {
private static final Method CALL_METHOD = ReflectTools.findMethod(
JavascriptCallbackRpc.class, "call", String.class, JSONArray.class);
private AbstractClientConnector connector;
private Map<String, JavascriptCallback> callbacks = new HashMap<String, JavascriptCallback>();
private JavascriptCallbackRpc javascriptCallbackRpc;
public JavascriptRpcHelper(AbstractClientConnector connector) {
this.connector = connector;
}
public void registerCallback(String functionName,
JavascriptCallback javascriptCallback) {
callbacks.put(functionName, javascriptCallback);
ensureRpc();
}
private void ensureRpc() {
if (javascriptCallbackRpc == null) {
javascriptCallbackRpc = new JavascriptCallbackRpc() {
public void call(String name, JSONArray arguments) {
JavascriptCallback callback = callbacks.get(name);
try {
callback.call(arguments);
} catch (JSONException e) {
throw new IllegalArgumentException(e);
}
}
};
connector.registerRpc(javascriptCallbackRpc);
}
}
public void invokeCallback(String name, Object... arguments) {
JSONArray args = new JSONArray(Arrays.asList(arguments));
connector.addMethodInvocationToQueue(
JavascriptCallbackRpc.class.getName(), CALL_METHOD,
new Object[] { name, args });
connector.requestRepaint();
}
}
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