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Groovy example source code file (TestSupport.java)

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

Java - Groovy tags/keywords

bean, class, class, exception, exception, expressionstatement, groovyclassloader, groovycodesource, groovyobject, io, javabean, method, object, object, propertydescriptor, reflection, security, string, string

The Groovy TestSupport.java 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
 *
 *     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.codehaus.groovy.classgen;

import groovy.lang.*;
import groovy.util.GroovyTestCase;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.CompileUnit;
import org.codehaus.groovy.ast.FieldNode;
import org.codehaus.groovy.ast.ModuleNode;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.FieldExpression;
import org.codehaus.groovy.ast.expr.MethodCallExpression;
import org.codehaus.groovy.ast.stmt.ExpressionStatement;
import org.codehaus.groovy.control.CompilerConfiguration;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.objectweb.asm.Opcodes;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;

/**
 * Base class for test cases
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 21496 $
 */
public class TestSupport extends GroovyTestCase implements Opcodes {

    protected static boolean DUMP_CLASS = false;

    // ClassLoader parentLoader = Thread.currentThread().getContextClassLoader();
    final ClassLoader parentLoader = getClass().getClassLoader();
    protected final GroovyClassLoader loader =
            (GroovyClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
                public Object run() {
                    return new GroovyClassLoader(parentLoader);
                }
            });
    final CompileUnit unit = new CompileUnit(loader, new CompilerConfiguration());
    final ModuleNode module = new ModuleNode(unit);

    protected Class loadClass(ClassNode classNode) {
        classNode.setModule(module);
        Class fooClass = loader.defineClass(classNode, classNode.getName() + ".groovy", "groovy.testSupport");
        return fooClass;
    }

    protected void assertSetProperty(Object bean, String property, Object newValue) throws Exception {
        PropertyDescriptor descriptor = getDescriptor(bean, property);
        Method method = descriptor.getWriteMethod();
        assertTrue("has setter method", method != null);

        Object[] args = {newValue};
        Object value = invokeMethod(bean, method, args);

        assertEquals("should return null", null, value);

        assertGetProperty(bean, property, newValue);
    }

    protected void assertGetProperty(Object bean, String property, Object expected) throws Exception {
        PropertyDescriptor descriptor = getDescriptor(bean, property);
        Method method = descriptor.getReadMethod();
        assertTrue("has getter method", method != null);

        Object[] args = {
        };
        Object value = invokeMethod(bean, method, args);

        /*
        System.out.println("Expected: " + expected);
        System.out.println("Value: " + value);
        
        if (expected == null) { System.out.println("Expected is null"); }
        if (value == null) { System.out.println("value is null"); }
        */

        assertEquals("property value", expected, value);
    }

    protected Object invokeMethod(Object bean, Method method, Object[] args) throws Exception {
        try {
            return method.invoke(bean, args);
        }
        catch (InvocationTargetException e) {
            fail("InvocationTargetException: " + e.getTargetException());
            return null;
        }
    }

    protected PropertyDescriptor getDescriptor(Object bean, String property) throws Exception {
        BeanInfo info = Introspector.getBeanInfo(bean.getClass());
        PropertyDescriptor[] descriptors = info.getPropertyDescriptors();
        for (int i = 0; i < descriptors.length; i++) {
            PropertyDescriptor descriptor = descriptors[i];
            if (descriptor.getName().equals(property)) {
                return descriptor;
            }
        }
        fail("Could not find property: " + property + " on bean: " + bean);
        return null;
    }

    protected void assertField(Class aClass, String name, int modifiers, ClassNode type) throws Exception {
        Field field = aClass.getDeclaredField(name);

        assertTrue("Found field called: " + name, field != null);
        assertEquals("Name", name, field.getName());
        assertEquals("Type", type.getName(), field.getType().getName());
        assertEquals("Modifiers", modifiers, field.getModifiers());
    }

    protected ExpressionStatement createPrintlnStatement(Expression expression) throws NoSuchFieldException {
        return new ExpressionStatement(
                new MethodCallExpression(
                        new FieldExpression(FieldNode.newStatic(System.class, "out")),
                        "println",
                        expression));
    }

    /**
     * Asserts that the script runs without any exceptions
     */
    protected void assertScript(String text) throws Exception {
        assertScript(text, getTestClassName());
    }

    protected void assertScript(final String text, final String scriptName) throws Exception {
        log.info("About to execute script");
        log.info(text);
        GroovyCodeSource gcs = (GroovyCodeSource) AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {
                return new GroovyCodeSource(text, scriptName, "/groovy/testSupport");
            }
        });
        Class groovyClass = loader.parseClass(gcs);
        Script script = InvokerHelper.createScript(groovyClass, new Binding());
        script.run();
    }

    protected void assertScriptFile(String fileName) throws Exception {
        log.info("About to execute script: " + fileName);

        Class groovyClass = loader.parseClass(new GroovyCodeSource(new File(fileName)));
        Script script = InvokerHelper.createScript(groovyClass, new Binding());
        script.run();
    }

    protected GroovyObject compile(String fileName) throws Exception {
        Class groovyClass = loader.parseClass(new GroovyCodeSource(new File(fileName)));

        GroovyObject object = (GroovyObject) groovyClass.newInstance();

        assertTrue(object != null);

        return object;
    }
}

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