Return MultiValueMap from ServerRequest.queryParams instead of List

This commit changes ServerRequest.queryParams from returning a
List<String> given a String name, to returning a
MultiValueMap<String, String>, which gives more flexibility.

spring-test/src/main/java/org/springframework/mock/web/reactive/function/server/MockServerRequest.java

@@ -44,6 +44,7 @@ import org.springframework.http.server.reactive.RequestPath;
 import org.springframework.http.server.reactive.ServerHttpRequest;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
 import org.springframework.web.reactive.function.BodyExtractor;
@@ -168,8 +169,8 @@ public class MockServerRequest implements ServerRequest {
 	}
 
 	@Override
-	public List<String> queryParams(String name) {
-		return Collections.unmodifiableList(this.queryParams.get(name));
+	public MultiValueMap<String, String> queryParams() {
+		return CollectionUtils.unmodifiableMultiValueMap(this.queryParams);
 	}
 
 	@Override

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/DefaultServerRequest.java

@@ -156,9 +156,8 @@ class DefaultServerRequest implements ServerRequest {
 	}
 
 	@Override
-	public List<String> queryParams(String name) {
-		List<String> queryParams = request().getQueryParams().get(name);
-		return queryParams != null ? queryParams : Collections.emptyList();
+	public MultiValueMap<String, String> queryParams() {
+		return request().getQueryParams();
 	}
 
 	@Override

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RequestPredicates.java

@@ -535,8 +535,8 @@ public abstract class RequestPredicates {
 		}
 
 		@Override
-		public List<String> queryParams(String name) {
-			return this.request.queryParams(name);
+		public MultiValueMap<String, String> queryParams() {
+			return this.request.queryParams();
 		}
 
 		@Override

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/ServerRequest.java

@@ -146,7 +146,7 @@ public interface ServerRequest {
 	 * @return the parameter value
 	 */
 	default Optional<String> queryParam(String name) {
-		List<String> queryParams = this.queryParams(name);
+		List<String> queryParams = queryParams().get(name);
 		if (queryParams.isEmpty()) {
 			return Optional.empty();
 		}
@@ -160,12 +160,9 @@ public interface ServerRequest {
 	}
 
 	/**
-	 * Return all query parameter with the given name.
-	 * <p>Returns an empty list if no values could be found.
-	 * @param name the parameter name
-	 * @return the parameter values
+	 * Return all query parameters for this request.
 	 */
-	List<String> queryParams(String name);
+	MultiValueMap<String, String> queryParams();
 
 	/**
 	 * Return the path variable with the given name, if present.
@@ -184,13 +181,12 @@ public interface ServerRequest {
 	}
 
 	/**
-	 * Return all path variables for the current request.
-	 * @return a {@code Map} from path variable name to associated value
+	 * Return all path variables for this request.
 	 */
 	Map<String, String> pathVariables();
 
 	/**
-	 * Return the web session for the current request. Always guaranteed  to
+	 * Return the web session for this request. Always guaranteed to
 	 * return an instance either matching to the session id requested by the
 	 * client, or with a new session id either because the client did not
 	 * specify one or because the underlying session had expired. Use of this

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/support/ServerRequestWrapper.java

@@ -139,8 +139,8 @@ public class ServerRequestWrapper implements ServerRequest {
 	}
 
 	@Override
-	public List<String> queryParams(String name) {
-		return this.delegate.queryParams(name);
+	public MultiValueMap<String, String> queryParams() {
+		return this.delegate.queryParams();
 	}
 
 	@Override

spring-webflux/src/test/java/org/springframework/web/reactive/function/server/MockServerRequest.java

@@ -44,6 +44,7 @@ import org.springframework.http.server.reactive.RequestPath;
 import org.springframework.http.server.reactive.ServerHttpRequest;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
 import org.springframework.web.reactive.function.BodyExtractor;
@@ -167,8 +168,8 @@ public class MockServerRequest implements ServerRequest {
 	}
 
 	@Override
-	public List<String> queryParams(String name) {
-		return Collections.unmodifiableList(this.queryParams.get(name));
+	public MultiValueMap<String, String> queryParams() {
+		return CollectionUtils.unmodifiableMultiValueMap(this.queryParams);
 	}
 
 	@Override

spring-webflux/src/test/java/org/springframework/web/reactive/function/server/support/ServerRequestWrapperTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -18,7 +18,6 @@ package org.springframework.web.reactive.function.server.support;
 
 import java.net.URI;
 import java.util.Collections;
-import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 
@@ -26,12 +25,12 @@ import org.junit.Before;
 import org.junit.Test;
 
 import org.springframework.http.HttpMethod;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
 import org.springframework.web.reactive.function.server.ServerRequest;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertSame;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
 
 /**
  * @author Arjen Poutsma
@@ -105,11 +104,11 @@ public class ServerRequestWrapperTests {
 
 	@Test
 	public void queryParams() throws Exception {
-		String name = "foo";
-		List<String> value = Collections.singletonList("bar");
-		when(mockRequest.queryParams(name)).thenReturn(value);
+		MultiValueMap<String, String> value = new LinkedMultiValueMap<>();
+		value.add("foo", "bar");
+		when(mockRequest.queryParams()).thenReturn(value);
 
-		assertSame(value, wrapper.queryParams(name));
+		assertSame(value, wrapper.queryParams());
 	}
 
 	@Test