/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package org.apache.sling.scripting;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
import javax.script.SimpleScriptContext;
import org.apache.sling.scripting.javascript.RhinoJavaScriptEngineFactory;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Wrapper;
/** Helpers to run javascript code fragments in tests */
public class ScriptEngineHelper {
private static ScriptEngine engine;
public static class Data extends HashMap<String, Object> {
}
private static ScriptEngine getEngine() {
if (engine == null) {
synchronized (ScriptEngineHelper.class) {
engine = new RhinoJavaScriptEngineFactory().getScriptEngine();
}
}
return engine;
}
public String evalToString(String javascriptCode) throws ScriptException {
return evalToString(javascriptCode, null);
}
public Object eval(String javascriptCode, Map<String, Object> data)
throws ScriptException {
return eval(javascriptCode, data, new StringWriter());
}
public String evalToString(String javascriptCode, Map<String, Object> data)
throws ScriptException {
final StringWriter sw = new StringWriter();
eval(javascriptCode, data, sw);
return sw.toString();
}
public Object eval(String javascriptCode, Map<String, Object> data,
final StringWriter sw) throws ScriptException {
final PrintWriter pw = new PrintWriter(sw, true);
ScriptContext ctx = new SimpleScriptContext();
final Bindings b = new SimpleBindings();
b.put("out", pw);
if (data != null) {
for (Map.Entry<String, Object> e : data.entrySet()) {
b.put(e.getKey(), e.getValue());
}
}
ctx.setBindings(b, ScriptContext.ENGINE_SCOPE);
ctx.setWriter(sw);
ctx.setErrorWriter(new OutputStreamWriter(System.err));
Object result = getEngine().eval(javascriptCode, ctx);
if (result instanceof Wrapper) {
result = ((Wrapper) result).unwrap();
}
if (result instanceof ScriptableObject) {
result = ((ScriptableObject) result).getDefaultValue(null);
}
return result;
}
}