Move URL transform methods from ServerHttpResponse to ServerWebExchange

This commit moves `encodeUrl` and `registerUrlEncoder` from
ServerHttpResponse to ServerWebExchange.

It also renames `encodeUrl` to `transformUrl` and `registerUrlEncoder`
to `addUrlTransformer` to make it clearer that these methods do not
perform actual URL encodings (i.e. they do not replaceinvalid
characters).
The `add` prefix (instead of `register`) makes it clearer that each
function is added in addition to the previous one.

Issue: SPR-15924

spring-web/src/test/java/org/springframework/http/server/reactive/ServerHttpResponseTests.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.
@@ -32,9 +32,7 @@ import org.springframework.core.io.buffer.DefaultDataBufferFactory;
 import org.springframework.http.ResponseCookie;
 
 import static junit.framework.TestCase.assertTrue;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertSame;
+import static org.junit.Assert.*;
 
 /**
  * @author Rossen Stoyanchev
@@ -42,26 +40,6 @@ import static org.junit.Assert.assertSame;
  */
 public class ServerHttpResponseTests {
 
-	@Test
-	public void encodeUrlDefault() throws Exception {
-		TestServerHttpResponse response = new TestServerHttpResponse();
-		assertEquals("/foo", response.encodeUrl("/foo"));
-	}
-
-	@Test
-	public void encodeUrlWithEncoder() throws Exception {
-		TestServerHttpResponse response = new TestServerHttpResponse();
-		response.registerUrlEncoder(s -> s + "?nonce=123");
-		assertEquals("/foo?nonce=123", response.encodeUrl("/foo"));
-	}
-
-	@Test
-	public void encodeUrlWithMultipleEncoders() throws Exception {
-		TestServerHttpResponse response = new TestServerHttpResponse();
-		response.registerUrlEncoder(s -> s + ";p=abc");
-		response.registerUrlEncoder(s -> s + "?q=123");
-		assertEquals("/foo;p=abc?q=123", response.encodeUrl("/foo"));
-	}
 
 	@Test
 	public void writeWith() throws Exception {

spring-web/src/test/java/org/springframework/web/server/adapter/ServerWebExchangeTests.java

@@ -0,0 +1,60 @@
+/*
+ * 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.
+ * 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 org.springframework.web.server.adapter;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;
+import org.springframework.mock.http.server.reactive.test.MockServerWebExchange;
+import org.springframework.web.server.ServerWebExchange;
+
+import static org.junit.Assert.*;
+
+/**
+ * @author Arjen Poutsma
+ */
+public class ServerWebExchangeTests {
+
+	private ServerWebExchange exchange;
+
+	@Before
+	public void createExchange() {
+		MockServerHttpRequest request = MockServerHttpRequest.get("http://example.com").build();
+		this.exchange = new MockServerWebExchange(request);
+	}
+
+	@Test
+	public void transformUrlDefault() throws Exception {
+		assertEquals("/foo", this.exchange.transformUrl("/foo"));
+	}
+
+	@Test
+	public void transformUrlWithEncoder() throws Exception {
+		this.exchange.addUrlTransformer(s -> s + "?nonce=123");
+		assertEquals("/foo?nonce=123", this.exchange.transformUrl("/foo"));
+	}
+
+	@Test
+	public void transformUrlWithMultipleEncoders() throws Exception {
+		this.exchange.addUrlTransformer(s -> s + ";p=abc");
+		this.exchange.addUrlTransformer(s -> s + "?q=123");
+		assertEquals("/foo;p=abc?q=123", this.exchange.transformUrl("/foo"));
+	}
+
+
+}