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/*
 * Copyright 2013-2016 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
 *
 *      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 io.bitsensor.plugins.shaded.io.bitsensor.plugins.shaded.org.springframework.amqp.utils.test;

import io.bitsensor.plugins.shaded.org.springframework.beans.DirectFieldAccessor;
import io.bitsensor.plugins.shaded.org.springframework.util.Assert;

/**
 * See Spring Integration TestUtils.
 * @author Mark Fisher
 * @author Iwein Fuld
 * @author Oleg Zhurakousky
 * @author Gary Russell
 * @since 1.2
 */
public final class TestUtils {

	private TestUtils() {
		super();
	}

	/**
	 * Uses nested {@link DirectFieldAccessor}s to obtain a property using dotted notation to traverse fields; e.g.
	 * "foo.bar.baz" will obtain a reference to the baz field of the bar field of foo. Adopted from Spring Integration.
	 * @param root The object.
	 * @param propertyPath The path.
	 * @return The field.
	 */
	public static Object getPropertyValue(Object root, String propertyPath) {
		Object value = null;
		DirectFieldAccessor accessor = new DirectFieldAccessor(root);
		String[] tokens = propertyPath.split("\\.");
		for (int i = 0; i < tokens.length; i++) {
			value = accessor.getPropertyValue(tokens[i]);
			if (value != null) {
				accessor = new DirectFieldAccessor(value);
			}
			else if (i == tokens.length - 1) {
				return null;
			}
			else {
				throw new IllegalArgumentException("intermediate property '" + tokens[i] + "' is null");
			}
		}
		return value;
	}

	@SuppressWarnings("unchecked")
	public static  T getPropertyValue(Object root, String propertyPath, Class type) {
		Object value = getPropertyValue(root, propertyPath);
		if (value != null) {
			Assert.isAssignable(type, value.getClass());
		}
		return (T) value;
	}

}