How do I call a specific function of a script?
Category: javax.script, viewed: 1988 time(s).
This code demonstrate the use of Invocable interface to invoke a specific function of a script. The Invocable.invokeFunction() takes the function name with or without a parameter as the function's parameter. The parameter value can be passed as a varargs.
package org.kodejava.example.script;
import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
import javax.script.Invocable;
public class InvokingFunction {
public static void main(String[] args) {
String script =
"function sayHello() {" +
" sayHello(null);" +
"}" +
" " +
"function sayHello(name) {" +
" println('Hi there' + " +
" ((name == null) ? '!' : ' ' + name + '!'));" +
"}";
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByExtension("js");
try {
engine.eval(script);
//
// Convert / cast the engine into invocable engine.
//
Invocable invocableEngine = (Invocable) engine;
//
// Invoking sayHello function without parameter.
//
invocableEngine.invokeFunction("sayHello");
//
// Invoking sayHello function with a parameter.
//
invocableEngine.invokeFunction("sayHello", "Jude");
} catch (ScriptException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
}
}
More examples on javax.script
