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Groovy example source code file (

This example Groovy source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

acc_private, acc_public, acc_public, binaryexpression, classnode, constantexpression, constantexpression, fieldexpression, fieldexpression, fieldnode, ifstatement, object, object, statement

The Groovy source code

 * Copyright 2003-2011 the original author or authors.
 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.codehaus.groovy.classgen;

import org.codehaus.groovy.ast.*;
import org.codehaus.groovy.ast.expr.BinaryExpression;
import org.codehaus.groovy.ast.expr.BooleanExpression;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.FieldExpression;
import org.codehaus.groovy.ast.stmt.ExpressionStatement;
import org.codehaus.groovy.ast.stmt.IfStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.syntax.Token;

 * @author <a href="">James Strachan
 * @version $Revision: 21496 $
public class IfElseTest extends TestSupport {

    public void testLoop() throws Exception {
        ClassNode classNode = new ClassNode("Foo", ACC_PUBLIC, ClassHelper.OBJECT_TYPE);
        classNode.addConstructor(new ConstructorNode(ACC_PUBLIC, null));
        classNode.addProperty(new PropertyNode("bar", ACC_PUBLIC, ClassHelper.STRING_TYPE, classNode, null, null, null));

        classNode.addProperty(new PropertyNode("result", ACC_PUBLIC, ClassHelper.STRING_TYPE, classNode, null, null, null));

        BooleanExpression expression =
                new BooleanExpression(
                        new BinaryExpression(
                                new FieldExpression(
                                        new FieldNode("bar", ACC_PRIVATE, ClassHelper.STRING_TYPE, classNode, ConstantExpression.NULL)),
                                Token.newSymbol("==", 0, 0),
                                new ConstantExpression("abc")));

        Statement trueStatement =
                new ExpressionStatement(
                        new BinaryExpression(
                                new FieldExpression(
                                        new FieldNode("result", ACC_PRIVATE, ClassHelper.STRING_TYPE, classNode, ConstantExpression.NULL)),
                                Token.newSymbol("=", 0, 0),
                                new ConstantExpression("worked")));

        Statement falseStatement = createPrintlnStatement(new ConstantExpression("false"));

        IfStatement statement = new IfStatement(expression, trueStatement, falseStatement);
        classNode.addMethod(new MethodNode("ifDemo", ACC_PUBLIC, ClassHelper.VOID_TYPE, Parameter.EMPTY_ARRAY, ClassNode.EMPTY_ARRAY, statement));

        Class fooClass = loadClass(classNode);
        assertTrue("Loaded a new class", fooClass != null);

        Object bean = fooClass.newInstance();
        assertTrue("Managed to create bean", bean != null);

        assertSetProperty(bean, "bar", "abc");

        System.out.println("################ Now about to invoke method");

        Object[] array = {

        InvokerHelper.invokeMethod(bean, "ifDemo", array);

        System.out.println("################ Done");

        assertGetProperty(bean, "result", "worked");

Other Groovy examples (source code examples)

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