org.springframework.amqp.utils.test.TestUtils.java Source code

Introduction

Here is the source code for org.springframework.amqp.utils.test.TestUtils.java

Source

/*
 * Copyright 2013-2019 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.amqp.utils.test;

import org.springframework.beans.DirectFieldAccessor;
import 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> T getPropertyValue(Object root, String propertyPath, Class<T> type) {
        Object value = getPropertyValue(root, propertyPath);
        if (value != null) {
            Assert.isAssignable(type, value.getClass());
        }
        return (T) value;
    }

}