/* 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.
*/
package org.camunda.spin.test;
import java.util.HashMap;
import java.util.Map;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import org.camunda.spin.logging.SpinLogger;
import org.junit.ClassRule;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/**
* A jUnit4 {@link ClassRule} to define create a {@link ScriptEngine}
* base on {@literal @}{@link ScriptEngineRule} annotation.
*
* @author Sebastian Menski
*/
public class ScriptEngineRule implements TestRule {
private static final SpinTestLogger LOG = SpinLogger.TEST_LOGGER;
private javax.script.ScriptEngine scriptEngine;
private static final Map<String, ScriptEngine> cachedEngines = new HashMap<String, ScriptEngine>();
public Statement apply(final Statement base, final Description description) {
return new Statement() {
public void evaluate() throws Throwable {
scriptEngine = createScriptEngine(description);
if (scriptEngine != null) {
LOG.scriptEngineFoundForLanguage(scriptEngine.getFactory().getLanguageName());
}
base.evaluate();
}
};
}
/**
* Create script engine from {@literal @}{@link org.camunda.spin.test.ScriptEngine} Annotation. The created
* script engines will be cached to speedup subsequent creations.
*
* @param description the {@link Description} of the test method
* @return the script engine or null if no suitable found
*/
private ScriptEngine createScriptEngine(Description description) {
org.camunda.spin.test.ScriptEngine annotation = description.getTestClass().getAnnotation(org.camunda.spin.test.ScriptEngine.class);
if (annotation == null) {
return null;
}
else {
String language = annotation.value();
if (!cachedEngines.containsKey(language)) {
ScriptEngine engine = new ScriptEngineManager().getEngineByName(language);
if (engine == null) {
throw LOG.noScriptEngineFoundForLanguage(language);
}
cachedEngines.put(language, engine);
}
return cachedEngines.get(language);
}
}
/**
* Get the script engine defined by the {@literal @}{@link org.camunda.spin.test.ScriptEngine} Annotation
*
* @return the script engine or null if no script engine was found
*/
public ScriptEngine getScriptEngine() {
return scriptEngine;
}
}