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/*
 * Copyright 2012-2020 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
 *
 *      https://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.springframework.cloud.util;

import org.springframework.aop.framework.Advised;
import org.springframework.aop.support.AopUtils;
import org.springframework.util.Assert;

/**
 * @author Ryan Baxter
 */
public final class ProxyUtils {

	private ProxyUtils() {
		throw new IllegalStateException("Can't instantiate a utility class");
	}

	@SuppressWarnings("unchecked")
	public static  T getTargetObject(Object candidate) {
		Assert.notNull(candidate, "Candidate must not be null");
		try {
			if (AopUtils.isAopProxy(candidate) && candidate instanceof Advised) {
				Object target = ((Advised) candidate).getTargetSource().getTarget();
				if (target != null) {
					return (T) getTargetObject(target);
				}
			}
		}
		catch (Exception ex) {
			throw new IllegalStateException("Failed to unwrap proxied object", ex);
		}
		return (T) candidate;
	}

}