Polish

Closes gh-1120
Signed-off-by: Mingyuan Wu <my.wu@outlook.com>

Author: m1ngyuan

spring-graphql/src/main/java/org/springframework/graphql/server/webflux/AbstractGraphQlHttpHandler.java

@@ -52,6 +52,7 @@ public abstract class AbstractGraphQlHttpHandler {
 
 	protected final Log logger = LogFactory.getLog(getClass());
 
+	private static final MediaType APPLICATION_GRAPHQL = MediaType.parseMediaType("application/graphql");
 
 	private final WebGraphQlHandler graphQlHandler;
 
@@ -118,10 +119,9 @@ private static Mono<SerializableGraphQlRequest> applyApplicationGraphQlFallback(
 		String contentTypeHeader = request.headers().firstHeader(HttpHeaders.CONTENT_TYPE);
 		if (StringUtils.hasText(contentTypeHeader)) {
 			MediaType contentType = MediaType.parseMediaType(contentTypeHeader);
-			MediaType applicationGraphQl = MediaType.parseMediaType("application/graphql");
 
 			// Spec requires application/json but some clients still use application/graphql
-			return applicationGraphQl.includes(contentType) ? ServerRequest.from(request)
+			return APPLICATION_GRAPHQL.includes(contentType) ? ServerRequest.from(request)
 					.headers((headers) -> headers.setContentType(MediaType.APPLICATION_JSON))
 					.body(request.bodyToFlux(DataBuffer.class))
 					.build()

spring-graphql/src/main/java/org/springframework/graphql/server/webflux/GraphQlRequestPredicates.java

@@ -73,6 +73,8 @@ public static RequestPredicate graphQlSse(String path) {
 
 	private static class GraphQlHttpRequestPredicate implements RequestPredicate {
 
+		private static final MediaType APPLICATION_GRAPHQL = MediaType.parseMediaType("application/graphql");
+
 		private final PathPattern pattern;
 
 		private final List<MediaType> contentTypes;
@@ -86,7 +88,7 @@ private static class GraphQlHttpRequestPredicate implements RequestPredicate {
 			PathPatternParser parser = PathPatternParser.defaultInstance;
 			path = parser.initFullPathPattern(path);
 			this.pattern = parser.parse(path);
-			this.contentTypes = List.of(MediaType.APPLICATION_JSON, MediaType.parseMediaType("application/graphql"));
+			this.contentTypes = List.of(MediaType.APPLICATION_JSON, APPLICATION_GRAPHQL);
 			this.acceptedMediaTypes = accepted;
 		}
 

spring-graphql/src/main/java/org/springframework/graphql/server/webmvc/AbstractGraphQlHttpHandler.java

@@ -67,6 +67,8 @@ public abstract class AbstractGraphQlHttpHandler {
 
 	protected final Log logger = LogFactory.getLog(getClass());
 
+	private static final MediaType APPLICATION_GRAPHQL = MediaType.parseMediaType("application/graphql");
+
 	private final IdGenerator idGenerator = new AlternativeJdkIdGenerator();
 
 	private final WebGraphQlHandler graphQlHandler;
@@ -174,9 +176,8 @@ private static SerializableGraphQlRequest applyApplicationGraphQlFallback(
 		String contentTypeHeader = request.headers().firstHeader(HttpHeaders.CONTENT_TYPE);
 		if (StringUtils.hasText(contentTypeHeader)) {
 			MediaType contentType = MediaType.parseMediaType(contentTypeHeader);
-			MediaType applicationGraphQl = MediaType.parseMediaType("application/graphql");
 			// Spec requires application/json but some clients still use application/graphql
-			if (applicationGraphQl.includes(contentType)) {
+			if (APPLICATION_GRAPHQL.includes(contentType)) {
 				try {
 					request = ServerRequest.from(request)
 							.headers((headers) -> headers.setContentType(MediaType.APPLICATION_JSON))

spring-graphql/src/main/java/org/springframework/graphql/server/webmvc/GraphQlRequestPredicates.java

@@ -73,6 +73,8 @@ public static RequestPredicate graphQlSse(String path) {
 
 	private static class GraphQlHttpRequestPredicate implements RequestPredicate {
 
+		private static final MediaType APPLICATION_GRAPHQL = MediaType.parseMediaType("application/graphql");
+
 		private final PathPattern pattern;
 
 		private final List<MediaType> contentTypes;
@@ -86,7 +88,7 @@ private static class GraphQlHttpRequestPredicate implements RequestPredicate {
 			PathPatternParser parser = PathPatternParser.defaultInstance;
 			path = parser.initFullPathPattern(path);
 			this.pattern = parser.parse(path);
-			this.contentTypes = List.of(MediaType.APPLICATION_JSON, MediaType.parseMediaType("application/graphql"));
+			this.contentTypes = List.of(MediaType.APPLICATION_JSON, APPLICATION_GRAPHQL);
 			this.acceptedMediaTypes = accepted;
 		}