BAEL-2899: project structure and example classes

java-groovy-joint/src/main/java/com/baeldung/App.java

@@ -0,0 +1,54 @@
+package com.baeldung;
+
+import groovy.lang.Binding;
+import groovy.lang.GroovyClassLoader;
+import groovy.lang.GroovyShell;
+import org.codehaus.groovy.control.CompilerConfiguration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Hello world!
+ *
+ */
+public class App {
+    private final static Logger LOG = LoggerFactory.getLogger(App.class);
+    private final GroovyClassLoader loader;
+    private final GroovyShell shell;
+
+    private App() {
+        loader = new GroovyClassLoader(this.getClass().getClassLoader());
+        CompilerConfiguration config = new CompilerConfiguration();
+        config.setScriptBaseClass("com.baeldung.CalcScript");
+        shell = new GroovyShell(loader, new Binding(), config);
+    }
+
+    private void runScript(int x, int y) {
+        Object script = shell.parse(String.format("calcSum(%d,%d)", x, y));
+        assert script instanceof CalcScript;
+        Object result = ((CalcScript) script).run();
+        LOG.info("Result of run() method is {}", result);
+
+        Object script2 = shell.parse("CalcScript");
+        Object result2 = ((CalcScript) script2).calcSum(x + 7, y + 7);
+        LOG.info("Result of calcSum() method is {}", result2);
+
+    }
+
+    private void runClass(int x, int y) throws ClassNotFoundException, IllegalAccessException, InstantiationException {
+        Class calcClass = loader.loadClass("com.baeldung.CalcMath");
+        Object calc = calcClass.newInstance();
+        assert calc instanceof CalcMath;
+
+        Object result = ((CalcMath) calc).calcSum(x, y);
+        LOG.info("Result is {}", result);
+    }
+
+    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
+        App app = new App();
+        LOG.info("Running a groovy script...");
+        app.runScript(5, 10);
+        LOG.info("Running a groovy class...");
+        app.runClass(1, 3);
+    }
+}