DefaultResponseErrorHandler makes use of HttpStatus.isError()

Issue: SPR-17439

spring-web/src/main/java/org/springframework/http/HttpStatus.java

 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -435,50 +435,62 @@ public enum HttpStatus {
 		return this.reasonPhrase;
 	}
 
+	/**
+	 * Return the HTTP status series of this status code.
+	 * @see HttpStatus.Series
+	 */
+	public Series series() {
+		return Series.valueOf(this);
+	}
+
 	/**
 	 * Whether this status code is in the HTTP series
 	 * {@link org.springframework.http.HttpStatus.Series#INFORMATIONAL}.
 	 * This is a shortcut for checking the value of {@link #series()}.
+	 * @see #series()
 	 */
 	public boolean is1xxInformational() {
-		return Series.INFORMATIONAL.equals(series());
+		return (series() == Series.INFORMATIONAL);
 	}
 
 	/**
 	 * Whether this status code is in the HTTP series
 	 * {@link org.springframework.http.HttpStatus.Series#SUCCESSFUL}.
 	 * This is a shortcut for checking the value of {@link #series()}.
+	 * @see #series()
 	 */
 	public boolean is2xxSuccessful() {
-		return Series.SUCCESSFUL.equals(series());
+		return (series() == Series.SUCCESSFUL);
 	}
 
 	/**
 	 * Whether this status code is in the HTTP series
 	 * {@link org.springframework.http.HttpStatus.Series#REDIRECTION}.
 	 * This is a shortcut for checking the value of {@link #series()}.
+	 * @see #series()
 	 */
 	public boolean is3xxRedirection() {
-		return Series.REDIRECTION.equals(series());
+		return (series() == Series.REDIRECTION);
 	}
 
-
 	/**
 	 * Whether this status code is in the HTTP series
 	 * {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR}.
 	 * This is a shortcut for checking the value of {@link #series()}.
+	 * @see #series()
 	 */
 	public boolean is4xxClientError() {
-		return Series.CLIENT_ERROR.equals(series());
+		return (series() == Series.CLIENT_ERROR);
 	}
 
 	/**
 	 * Whether this status code is in the HTTP series
 	 * {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR}.
 	 * This is a shortcut for checking the value of {@link #series()}.
+	 * @see #series()
 	 */
 	public boolean is5xxServerError() {
-		return Series.SERVER_ERROR.equals(series());
+		return (series() == Series.SERVER_ERROR);
 	}
 
 	/**
@@ -486,17 +498,12 @@ public enum HttpStatus {
 	 * {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR} or
 	 * {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR}.
 	 * This is a shortcut for checking the value of {@link #series()}.
+	 * @since 5.0
+	 * @see #is4xxClientError()
+	 * @see #is5xxServerError()
 	 */
 	public boolean isError() {
-		return is4xxClientError() || is5xxServerError();
-	}
-
-	/**
-	 * Returns the HTTP status series of this status code.
-	 * @see HttpStatus.Series
-	 */
-	public Series series() {
-		return Series.valueOf(this);
+		return (is4xxClientError() || is5xxServerError());
 	}
 
 	/**
@@ -504,7 +511,7 @@ public enum HttpStatus {
 	 */
 	@Override
 	public String toString() {
-		return Integer.toString(this.value) + " " + name();
+		return this.value + " " + name();
 	}
 
 

spring-web/src/main/java/org/springframework/web/client/DefaultResponseErrorHandler.java

@@ -44,7 +44,11 @@ import org.springframework.util.FileCopyUtils;
 public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 
 	/**
-	 * Delegates to {@link #hasError(HttpStatus)} with the response status code.
+	 * Delegates to {@link #hasError(HttpStatus)} (for a standard status enum value) or
+	 * {@link #hasError(int)} (for an unknown status code) with the response status code.
+	 * @see ClientHttpResponse#getRawStatusCode()
+	 * @see #hasError(HttpStatus)
+	 * @see #hasError(int)
 	 */
 	@Override
 	public boolean hasError(ClientHttpResponse response) throws IOException {
@@ -55,16 +59,14 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 
 	/**
 	 * Template method called from {@link #hasError(ClientHttpResponse)}.
-	 * <p>The default implementation checks if the given status code is
-	 * {@code HttpStatus.Series#CLIENT_ERROR CLIENT_ERROR} or
-	 * {@code HttpStatus.Series#SERVER_ERROR SERVER_ERROR}.
+	 * <p>The default implementation checks {@link HttpStatus#isError()}.
 	 * Can be overridden in subclasses.
 	 * @param statusCode the HTTP status code as enum value
-	 * @return {@code true} if the response has an error; {@code false} otherwise
+	 * @return {@code true} if the response indicates an error; {@code false} otherwise
+	 * @see HttpStatus#isError()
 	 */
 	protected boolean hasError(HttpStatus statusCode) {
-		return (statusCode.series() == HttpStatus.Series.CLIENT_ERROR ||
-				statusCode.series() == HttpStatus.Series.SERVER_ERROR);
+		return statusCode.isError();
 	}
 
 	/**
@@ -74,8 +76,10 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 	 * {@code HttpStatus.Series#SERVER_ERROR SERVER_ERROR}.
 	 * Can be overridden in subclasses.
 	 * @param unknownStatusCode the HTTP status code as raw value
-	 * @return {@code true} if the response has an error; {@code false} otherwise
+	 * @return {@code true} if the response indicates an error; {@code false} otherwise
 	 * @since 4.3.21
+	 * @see HttpStatus.Series#CLIENT_ERROR
+	 * @see HttpStatus.Series#SERVER_ERROR
 	 */
 	protected boolean hasError(int unknownStatusCode) {
 		HttpStatus.Series series = HttpStatus.Series.resolve(unknownStatusCode);
@@ -83,7 +87,10 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 	}
 
 	/**
-	 * Delegates to {@link #handleError(ClientHttpResponse, HttpStatus)} with the response status code.
+	 * Delegates to {@link #handleError(ClientHttpResponse, HttpStatus)} with the
+	 * response status code.
+	 * @throws UnknownHttpStatusCodeException in case of an unresolvable status code
+	 * @see #handleError(ClientHttpResponse, HttpStatus)
 	 */
 	@Override
 	public void handleError(ClientHttpResponse response) throws IOException {
@@ -97,11 +104,13 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 
 	/**
 	 * Handle the error in the given response with the given resolved status code.
-	 * <p>This default implementation throws a {@link HttpClientErrorException} if the response status code
-	 * is {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR}, a {@link HttpServerErrorException}
-	 * if it is {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR},
-	 * and a {@link RestClientException} in other cases.
+	 * <p>The default implementation throws an {@link HttpClientErrorException}
+	 * if the status code is {@link HttpStatus.Series#CLIENT_ERROR}, an
+	 * {@link HttpServerErrorException} if it is {@link HttpStatus.Series#SERVER_ERROR},
+	 * and an {@link UnknownHttpStatusCodeException} in other cases.
 	 * @since 5.0
+	 * @see HttpClientErrorException#create
+	 * @see HttpServerErrorException#create
 	 */
 	protected void handleError(ClientHttpResponse response, HttpStatus statusCode) throws IOException {
 		String statusText = response.getStatusText();

spring-web/src/main/java/org/springframework/web/client/ResponseErrorHandler.java

 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -36,7 +36,7 @@ public interface ResponseErrorHandler {
 	 * <p>Implementations will typically inspect the
 	 * {@link ClientHttpResponse#getStatusCode() HttpStatus} of the response.
 	 * @param response the response to inspect
-	 * @return {@code true} if the response has an error; {@code false} otherwise
+	 * @return {@code true} if the response indicates an error; {@code false} otherwise
 	 * @throws IOException in case of I/O errors
 	 */
 	boolean hasError(ClientHttpResponse response) throws IOException;