groovy-core/src/test/org/codehaus/groovy/classgen/ReflectorGeneratorTest.java

/*
 $Id$

 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.

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 ("Software"), with or without modification, are permitted provided
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    copy of this document.

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    following disclaimer in the documentation and/or other
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    products derived from this Software without prior written
    permission of The Codehaus.  For written permission,
    please contact info@codehaus.org.

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    http://groovy.codehaus.org/

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package org.codehaus.groovy.classgen;

import groovy.lang.GroovySystem;
import groovy.lang.MetaClassRegistry;
import groovy.lang.MetaMethod;
import groovy.util.GroovyTestCase;
import org.codehaus.groovy.reflection.CachedClass;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.util.ASMifierClassVisitor;
import org.objectweb.asm.util.CheckClassAdapter;

import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
 * @version $Revision$
 */
public class ReflectorGeneratorTest extends GroovyTestCase {

    public void testGenerator() throws Exception {
        List methods = new ArrayList();
        methods.add(new MetaMethod("toCharArray", String.class, new CachedClass[0], char[].class, 0));
        //methods.add(new MetaMethod("toString", String.class, new Class[0], String.class, 0));
        testMethods(methods);
    }

    public void testObjectGenerator() throws Exception {
        List methods = InvokerHelper.getMetaClass(new Object()).getMethods();
        testMethods(methods);
    }

    public void testDummyReflector() throws Exception {
        DummyReflector dummy = new DummyReflector();
        assertTrue(dummy != null);
    }

    protected void testMethods(List methods) throws Exception {
        ReflectorGenerator generator = new ReflectorGenerator(methods);
        String name = getClass().getName() + "." + getMethodName();
        ClassWriter cw = new ClassWriter(true);

        //ASMifierClassVisitor dumper = new ASMifierClassVisitor(new PrintWriter(new OutputStreamWriter(System.out)));
        //generator.generate(dumper, name);

        generator.generate(new CheckClassAdapter(cw), name);

        byte[] bytecode = cw.toByteArray();

        // lets write it to disk
        String fileName = "target/" + name + ".class";
        FileOutputStream out = new FileOutputStream(fileName);
        out.write(bytecode);
        out.close();

        // now lets try dump it
        ASMifierClassVisitor.main(new String[]{fileName});

        // now lets try class load it
        MetaClassRegistry registry = GroovySystem.getMetaClassRegistry();
        Object reflector = ((MetaClassRegistryImpl) registry).loadReflector(getClass(), methods);

        System.out.println("Created new reflector: " + reflector);
    }
}