1 files changed, 64 insertions, 0 deletions
diff --git a/java/perftests/src/main/java/org/apache/qpid/disttest/controller/config/JavaScriptConfigEvaluator.java b/java/perftests/src/main/java/org/apache/qpid/disttest/controller/config/JavaScriptConfigEvaluator.java
new file mode 100644
index 0000000000..bbc22af00f
--- /dev/null
+++ b/java/perftests/src/main/java/org/apache/qpid/disttest/controller/config/JavaScriptConfigEvaluator.java
@@ -0,0 +1,64 @@
+/*
+ *
+ * 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.qpid.disttest.controller.config;
+
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.InputStreamReader;
+
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+
+import org.apache.qpid.disttest.DistributedTestException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * A helper class to load and evaluate JavaScript configuration, producing a JSON string.
+ */
+public class JavaScriptConfigEvaluator
+{
+    private static final Logger LOGGER = LoggerFactory.getLogger(JavaScriptConfigEvaluator.class);
+
+    public static final String TEST_CONFIG_VARIABLE_NAME = "jsonObject";
+
+    public String evaluateJavaScript(String fileName) throws FileNotFoundException
+    {
+        ScriptEngineManager mgr = new ScriptEngineManager();
+        ScriptEngine engine = mgr.getEngineByName("JavaScript");
+        try
+        {
+            engine.eval(new InputStreamReader(getClass().getClassLoader().getResourceAsStream("json2.js")));
+            engine.eval(new InputStreamReader(getClass().getClassLoader().getResourceAsStream("test-utils.js")));
+            engine.eval(new FileReader(fileName));
+            engine.eval("jsonString = JSON.stringify(" + TEST_CONFIG_VARIABLE_NAME + ")");
+        }
+        catch (ScriptException e)
+        {
+            throw new DistributedTestException("Exception while evaluating test config", e);
+        }
+        String result = (String) engine.get("jsonString");
+
+        LOGGER.debug("Evaluated javascript file " + fileName + ". Generated the following JSON: " + result);
+        return result;
+    }
+}