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/*
 * Copyright 2002-2020 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.test.web.servlet.result;

import java.util.Arrays;
import java.util.List;

import org.hamcrest.Matcher;

import org.springframework.http.HttpHeaders;
import org.springframework.mock.web.MockHttpServletResponse;
import org.springframework.test.web.servlet.ResultMatcher;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.springframework.test.util.AssertionErrors.assertEquals;
import static org.springframework.test.util.AssertionErrors.assertFalse;
import static org.springframework.test.util.AssertionErrors.assertNotNull;
import static org.springframework.test.util.AssertionErrors.assertTrue;

/**
 * Factory for response header assertions.
 *
 * An instance of this class is available via
 * {@link MockMvcResultMatchers#header}.
 *
 * @author Rossen Stoyanchev
 * @author Sam Brannen
 * @author Brian Clozel
 * @since 3.2
 */
public class HeaderResultMatchers {

	/**
	 * Protected constructor.
	 * See {@link MockMvcResultMatchers#header()}.
	 */
	protected HeaderResultMatchers() {
	}


	/**
	 * Assert the primary value of the response header with the given Hamcrest
	 * String {@code Matcher}.
	 */
	public ResultMatcher string(String name, Matcher matcher) {
		return result -> assertThat("Response header '" + name + "'", result.getResponse().getHeader(name), matcher);
	}

	/**
	 * Assert the values of the response header with the given Hamcrest
	 * Iterable {@link Matcher}.
	 * @since 4.3
	 */
	public ResultMatcher stringValues(String name, Matcher> matcher) {
		return result -> {
			List values = result.getResponse().getHeaders(name);
			assertThat("Response header '" + name + "'", values, matcher);
		};
	}

	/**
	 * Assert the primary value of the response header as a String value.
	 */
	public ResultMatcher string(String name, String value) {
		return result -> assertEquals("Response header '" + name + "'", value, result.getResponse().getHeader(name));
	}

	/**
	 * Assert the values of the response header as String values.
	 * @since 4.3
	 */
	public ResultMatcher stringValues(String name, String... values) {
		return result -> {
			List