/*
* 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.commons.testing.util;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ScriptableObject;
/** Simplistic Javascript engine using Rhino, meant
* for automated tests */
public class JavascriptEngine {
/** Execute supplied code against supplied data,
* see JavascriptEngineTest for examples */
public String execute(String code, String jsonData) throws IOException {
final String jsCode = "data=" + jsonData + ";\n" + code;
final Context rhinoContext = Context.enter();
final ScriptableObject scope = rhinoContext.initStandardObjects();
// execute the script, out script variable maps to sw
final StringWriter sw = new StringWriter();
final PrintWriter pw = new PrintWriter(sw, true);
ScriptableObject.putProperty(scope, "out", Context.javaToJS(pw, scope));
final int lineNumber = 1;
final Object securityDomain = null;
try {
rhinoContext.evaluateString(
scope,
jsCode,
getClass().getSimpleName(),
lineNumber,
securityDomain);
} catch(Exception e) {
final IOException ioe = new IOException("While executing [" + code + "]:" + e);
ioe.initCause(e);
throw ioe;
}
// check script output
pw.flush();
return sw.toString().trim();
}
}