org.rapidoid.commons.JS Maven / Gradle / Ivy
/*-
* #%L
* rapidoid-commons
* %%
* Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
package org.rapidoid.commons;
import org.rapidoid.RapidoidThing;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.u.U;
import javax.script.*;
import java.util.Map;
@Authors("Nikolche Mihajlovski")
@Since("5.0.4")
public class JS extends RapidoidThing {
public static boolean compiles(String js) {
try {
JS.compile(js);
return true;
} catch (ScriptException e) {
return false;
}
}
public static T eval(String js) throws ScriptException {
return eval(js, null);
}
@SuppressWarnings("unchecked")
public static T eval(String js, Map bindings) throws ScriptException {
ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
if (bindings != null) {
Map map = U.cast(bindings);
return (T) engine.eval(js, new SimpleBindings(map));
} else {
return (T) engine.eval(js);
}
}
public static CompiledScript compile(String js) throws ScriptException {
ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
U.must(engine instanceof Compilable, "The JavaScript engine cannot compile!");
Compilable compilable = (Compilable) engine;
return compilable.compile(js);
}
}