grails.plugin.springsecurity.acl.util.ProxyUtils.java Source code

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Here is the source code for grails.plugin.springsecurity.acl.util.ProxyUtils.java

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/* Copyright 2009-2014 SpringSource.
 *
 * 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 grails.plugin.springsecurity.acl.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Arrays;

import org.springframework.aop.support.AopUtils;
import org.springframework.util.ReflectionUtils;

/**
 * Utility methods for unproxying classes.
 *
 * @author <a href='mailto:burt@burtbeckwith.com'>Burt Beckwith</a>
 */
public class ProxyUtils {

    private ProxyUtils() {
        // static only
    }

    /**
     * Finds the unproxied superclass if proxied.
     * @param clazz  the potentially proxied class
     * @return  the unproxied class
     */
    public static Class<?> unproxy(final Class<?> clazz) {
        Class<?> current = clazz;
        while (isProxy(current)) {
            current = current.getSuperclass();
        }
        return current;
    }

    /**
     * Finds the method in the unproxied superclass if proxied.
     * @param method  the method
     * @return  the method in the unproxied class
     */
    public static Method unproxy(final Method method) {
        Class<?> clazz = method.getDeclaringClass();

        if (!isProxy(clazz)) {
            return method;
        }

        return ReflectionUtils.findMethod(unproxy(clazz), method.getName(), method.getParameterTypes());
    }

    /**
     * Finds the constructor in the unproxied superclass if proxied.
     * @param constructor  the constructor
     * @return  the constructor in the unproxied class
     */
    public static Constructor<?> unproxy(final Constructor<?> constructor) {
        Class<?> clazz = constructor.getDeclaringClass();

        if (!isProxy(clazz)) {
            return constructor;
        }

        Class<?> searchType = unproxy(clazz);
        while (searchType != null) {
            for (Constructor<?> c : searchType.getConstructors()) {
                if (constructor.getName().equals(c.getName()) && (constructor.getParameterTypes() == null
                        || Arrays.equals(constructor.getParameterTypes(), c.getParameterTypes()))) {
                    return c;
                }
            }
            searchType = searchType.getSuperclass();
        }

        return null;
    }

    protected static boolean isProxy(Class<?> clazz) {
        if (clazz.getSuperclass() == Object.class) {
            return false;
        }
        return isCglibProxyClass(clazz) || isJavassistProxy(clazz);
    }

    protected static boolean isJavassistProxy(Class<?> clazz) {
        for (Class<?> i : clazz.getInterfaces()) {
            if (i.getName().contains("org.hibernate.proxy.HibernateProxy")) {
                return true;
            }
        }
        return false;
    }

    @SuppressWarnings("deprecation") // needs to work in Spring 3.1 and earlier
    private static boolean isCglibProxyClass(Class<?> clazz) {
        return AopUtils.isCglibProxyClass(clazz);
    }
}