protected Class loadClass()

in transform/src/patch/java/org/apache/openjpa/lib/util/TemporaryClassLoader.java [47:98]
38 lines of code
14 McCabe index (conditional complexity)

    protected Class loadClass(String name, boolean resolve)
        throws ClassNotFoundException {
        // see if we've already loaded it
        Class c = findLoadedClass(name);
        if (c != null)
            return c;

        // bug #283. defer to system if the name is a protected name.
        // "sun." is required for JDK 1.4, which has an access check for
        // sun.reflect.GeneratedSerializationConstructorAccessor1
        if (name.startsWith("java.") || name.startsWith("javax.") || name.startsWith("jakarta.")
            || name.startsWith("sun.") || name.startsWith("jdk.")) {
            return Class.forName(name, resolve, getClass().getClassLoader());
        }

        String resourceName = name.replace('.', '/') + ".class";
        InputStream resource = getResourceAsStream(resourceName);
        if (resource == null) {
            throw new ClassNotFoundException(name);
        }

        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        byte[] b = new byte[1024];
        try {
            for (int n = 0; (n = resource.read(b, 0, b.length)) != -1;
                bout.write(b, 0, n))
                ;
            byte[] classBytes = bout.toByteArray();
            // To avoid classloader issues with the JVM (Sun and IBM), we
            // will not load Enums via the TemporaryClassLoader either.
            // Reference JIRA Issue OPENJPA-646 for more information.
            if (isAnnotation(classBytes) || isEnum(classBytes)) {
                try {
                    Class<?> frameworkClass = Class.forName(name, resolve,
                            getClass().getClassLoader());
                    return frameworkClass;
                } catch (ClassNotFoundException e) {
                    // OPENJPA-1121 continue, as it must be a user-defined class
                }
            }

            try {
                return defineClass(name, classBytes, 0, classBytes.length);
            } catch (SecurityException e) {
                // possible prohibited package: defer to the parent
                return super.loadClass(name, resolve);
            }
        } catch (IOException ioe) {
            // defer to the parent
            return super.loadClass(name, resolve);
        }
    }