Examples with ClassWriter jodd.asm5.ClassWriter used on opensource projects

Example 6 with ClassWriter

use of jodd.asm5.ClassWriter in project tomee by apache.

the class LocalBeanProxyFactory method generateProxy.

public static byte[] generateProxy(final Class<?> classToProxy, final String proxyName, final Class<?>... interfaces) throws ProxyGenerationException {
    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    final String proxyClassFileName = proxyName.replace('.', '/');
    final String classFileName = classToProxy.getName().replace('.', '/');
    // push class signature
    final String[] interfaceNames = new String[interfaces.length];
    for (int i = 0; i < interfaces.length; i++) {
        final Class<?> anInterface = interfaces[i];
        interfaceNames[i] = anInterface.getName().replace('.', '/');
    }
    cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, proxyClassFileName, null, classFileName, interfaceNames);
    cw.visitSource(classFileName + ".java", null);
    cw.visitAnnotation("L" + Proxy.class.getName().replace('.', '/') + ";", true).visitEnd();
    // push InvocationHandler fields
    cw.visitField(ACC_FINAL + ACC_PRIVATE, BUSSINESS_HANDLER_NAME, "Ljava/lang/reflect/InvocationHandler;", null, null).visitEnd();
    cw.visitField(ACC_FINAL + ACC_PRIVATE, NON_BUSINESS_HANDLER_NAME, "Ljava/lang/reflect/InvocationHandler;", null, null).visitEnd();
    final Map<String, List<Method>> methodMap = new HashMap<String, List<Method>>();
    getNonPrivateMethods(classToProxy, methodMap);
    for (final Class<?> anInterface : interfaces) {
        getNonPrivateMethods(anInterface, methodMap);
    }
    // Iterate over the public methods
    for (final Map.Entry<String, List<Method>> entry : methodMap.entrySet()) {
        for (final Method method : entry.getValue()) {
            final String name = method.getName();
            if (Modifier.isPublic(method.getModifiers()) || method.getParameterTypes().length == 0 && ("finalize".equals(name) || "clone".equals(name))) {
                // forward invocations of any public methods or
                // finalize/clone methods to businessHandler
                processMethod(cw, method, proxyClassFileName, BUSSINESS_HANDLER_NAME);
            } else {
                // forward invocations of any other methods to nonBusinessHandler
                processMethod(cw, method, proxyClassFileName, NON_BUSINESS_HANDLER_NAME);
            }
        }
    }
    return cw.toByteArray();
}

Example 7 with ClassWriter

use of jodd.asm5.ClassWriter in project tomee by apache.

the class JpaTest method addNewField.

public static byte[] addNewField(final byte[] origBytes) {
    final ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    final FieldAdderClassVisitor visitor = new FieldAdderClassVisitor(classWriter);
    final ClassReader classReader = new ClassReader(origBytes);
    classReader.accept(visitor, 0);
    return classWriter.toByteArray();
}

Example 8 with ClassWriter

use of jodd.asm5.ClassWriter in project tomee by apache.

the class MakeTxLookup method createTopLinkStrategy.

private static void createTopLinkStrategy(final File baseDir) throws Exception {
    final String factory = TOPLINK_FACTORY;
    final String classFilePath = factory.replace('.', '/');
    final String sourceFileName = factory.substring(factory.lastIndexOf('.') + 1, factory.length()) + ".java";
    final ClassWriter cw = new ClassWriter(0);
    MethodVisitor mv;
    cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, classFilePath, null, "oracle/toplink/essentials/transaction/JTATransactionController", null);
    cw.visitSource(sourceFileName, null);
    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "oracle/toplink/essentials/transaction/JTATransactionController", "<init>", "()V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PROTECTED, "acquireTransactionManager", "()Ljavax/transaction/TransactionManager;", null, new String[] { "java/lang/Exception" });
        mv.visitCode();
        mv.visitMethodInsn(INVOKESTATIC, "org/apache/openejb/OpenEJB", "getTransactionManager", "()Ljavax/transaction/TransactionManager;", false);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    cw.visitEnd();
    write(baseDir, cw, classFilePath);
}

Example 9 with ClassWriter

use of jodd.asm5.ClassWriter in project tomee by apache.

the class MakeTxLookup method createHibernteStrategy.

private static void createHibernteStrategy(final File baseDir) throws Exception {
    final String factory = HIBERNATE_FACTORY;
    final String classFilePath = factory.replace('.', '/');
    final String sourceFileName = factory.substring(factory.lastIndexOf('.') + 1, factory.length()) + ".java";
    final ClassWriter cw = new ClassWriter(0);
    MethodVisitor mv;
    cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, classFilePath, null, "java/lang/Object", new String[] { "org/hibernate/transaction/TransactionManagerLookup" });
    cw.visitSource(sourceFileName, null);
    {
        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "getTransactionManager", "(Ljava/util/Properties;)Ljavax/transaction/TransactionManager;", null, new String[] { "org/hibernate/HibernateException" });
        mv.visitCode();
        mv.visitMethodInsn(INVOKESTATIC, "org/apache/openejb/OpenEJB", "getTransactionManager", "()Ljavax/transaction/TransactionManager;", false);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(1, 2);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "getUserTransactionName", "()Ljava/lang/String;", null, null);
        mv.visitCode();
        mv.visitLdcInsn("java:comp/UserTransaction");
        mv.visitInsn(ARETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "getTransactionIdentifier", "(Ljavax/transaction/Transaction;)Ljava/lang/Object;", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 1);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(1, 2);
        mv.visitEnd();
    }
    cw.visitEnd();
    write(baseDir, cw, classFilePath);
}

Example 10 with ClassWriter

use of jodd.asm5.ClassWriter in project tomee by apache.

the class DynamicSubclass method generateBytes.

private static byte[] generateBytes(final Class<?> classToProxy, final boolean proxyNonAbstractMethods) throws ProxyGenerationException {
    final Map<String, MethodVisitor> visitors = new HashMap<String, MethodVisitor>();
    final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    final String proxyClassFileName = getSubclassName(classToProxy).replace('.', '/');
    final String classFileName = classToProxy.getName().replace('.', '/');
    cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, proxyClassFileName, null, classFileName, null);
    cw.visitSource(classFileName + ".java", null);
    // push InvocationHandler field
    cw.visitField(ACC_FINAL + ACC_PRIVATE, "this$handler", "Ljava/lang/reflect/InvocationHandler;", null, null).visitEnd();
    for (final Constructor<?> constructor : classToProxy.getConstructors()) {
        if (!Modifier.isPublic(constructor.getModifiers())) {
            continue;
        }
        final MethodVisitor mv = visitConstructor(cw, proxyClassFileName, classFileName, constructor);
        visitors.put("<init>" + Type.getConstructorDescriptor(constructor), mv);
    }
    final Map<String, List<Method>> methodMap = new HashMap<>();
    getNonPrivateMethods(classToProxy, methodMap);
    // Iterate over the public methods
    for (final Map.Entry<String, List<Method>> entry : methodMap.entrySet()) {
        for (final Method method : entry.getValue()) {
            if (Modifier.isAbstract(method.getModifiers()) || (proxyNonAbstractMethods && Modifier.isPublic(method.getModifiers()))) {
                final MethodVisitor visitor = LocalBeanProxyFactory.visit(cw, method, proxyClassFileName, "this$handler");
                visitors.put(method.getName() + Type.getMethodDescriptor(method), visitor);
            }
        }
    }
    copyClassAnnotations(classToProxy, cw);
    copyMethodAnnotations(classToProxy, visitors);
    // This should never be reached, but just in case
    for (final MethodVisitor visitor : visitors.values()) {
        visitor.visitEnd();
    }
    return cw.toByteArray();
}