Polishing

spring-core/src/main/java/org/springframework/util/MimeType.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * 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.
@@ -194,7 +194,7 @@ public class MimeType implements Comparable<MimeType>, Serializable {
 	 * @see <a href="https://tools.ietf.org/html/rfc2616#section-2.2">HTTP 1.1, section 2.2</a>
 	 */
 	private void checkToken(String token) {
-		for (int i = 0; i < token.length(); i++ ) {
+		for (int i = 0; i < token.length(); i++) {
 			char ch = token.charAt(i);
 			if (!TOKEN.get(ch)) {
 				throw new IllegalArgumentException("Invalid token character '" + ch + "' in token \"" + token + "\"");
@@ -207,8 +207,7 @@ public class MimeType implements Comparable<MimeType>, Serializable {
 		Assert.hasLength(value, "'value' must not be empty");
 		checkToken(attribute);
 		if (PARAM_CHARSET.equals(attribute)) {
-			value = unquote(value);
-			Charset.forName(value);
+			Charset.forName(unquote(value));
 		}
 		else if (!isQuotedString(value)) {
 			checkToken(value);

spring-jms/src/main/java/org/springframework/jms/support/converter/MappingJackson2MessageConverter.java

@@ -123,7 +123,7 @@ public class MappingJackson2MessageConverter implements SmartMessageConverter, B
 	/**
 	 * Specify the encoding to use when converting to and from text-based
 	 * message body content. The default encoding will be "UTF-8".
-	 * <p>When reading from a a text-based message, an encoding may have been
+	 * <p>When reading from a text-based message, an encoding may have been
 	 * suggested through a special JMS property which will then be preferred
 	 * over the encoding set on this MessageConverter instance.
 	 * @see #setEncodingPropertyName
@@ -457,11 +457,11 @@ public class MappingJackson2MessageConverter implements SmartMessageConverter, B
 		}
 		Class<?> mappedClass = this.idClassMappings.get(typeId);
 		if (mappedClass != null) {
-			return this.objectMapper.getTypeFactory().constructType(mappedClass);
+			return this.objectMapper.constructType(mappedClass);
 		}
 		try {
 			Class<?> typeClass = ClassUtils.forName(typeId, this.beanClassLoader);
-			return this.objectMapper.getTypeFactory().constructType(typeClass);
+			return this.objectMapper.constructType(typeClass);
 		}
 		catch (Throwable ex) {
 			throw new MessageConversionException("Failed to resolve type id [" + typeId + "]", ex);

spring-messaging/src/main/java/org/springframework/messaging/converter/AbstractMessageConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * 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.
@@ -151,21 +151,6 @@ public abstract class AbstractMessageConverter implements SmartMessageConverter
 	}
 
 
-	/**
-	 * Returns the default content type for the payload. Called when
-	 * {@link #toMessage(Object, MessageHeaders)} is invoked without message headers or
-	 * without a content type header.
-	 * <p>By default, this returns the first element of the {@link #getSupportedMimeTypes()
-	 * supportedMimeTypes}, if any. Can be overridden in sub-classes.
-	 * @param payload the payload being converted to message
-	 * @return the content type, or {@code null} if not known
-	 */
-	@Nullable
-	protected MimeType getDefaultContentType(Object payload) {
-		List<MimeType> mimeTypes = getSupportedMimeTypes();
-		return (!mimeTypes.isEmpty() ? mimeTypes.get(0) : null);
-	}
-
 	@Override
 	@Nullable
 	public final Object fromMessage(Message<?> message, Class<?> targetClass) {
@@ -181,10 +166,6 @@ public abstract class AbstractMessageConverter implements SmartMessageConverter
 		return convertFromInternal(message, targetClass, conversionHint);
 	}
 
-	protected boolean canConvertFrom(Message<?> message, Class<?> targetClass) {
-		return (supports(targetClass) && supportsMimeType(message.getHeaders()));
-	}
-
 	@Override
 	@Nullable
 	public final Message<?> toMessage(Object payload, @Nullable MessageHeaders headers) {
@@ -224,6 +205,11 @@ public abstract class AbstractMessageConverter implements SmartMessageConverter
 		return builder.build();
 	}
 
+
+	protected boolean canConvertFrom(Message<?> message, Class<?> targetClass) {
+		return (supports(targetClass) && supportsMimeType(message.getHeaders()));
+	}
+
 	protected boolean canConvertTo(Object payload, @Nullable MessageHeaders headers) {
 		return (supports(payload.getClass()) && supportsMimeType(headers));
 	}
@@ -249,6 +235,22 @@ public abstract class AbstractMessageConverter implements SmartMessageConverter
 		return (headers != null && this.contentTypeResolver != null ? this.contentTypeResolver.resolve(headers) : null);
 	}
 
+	/**
+	 * Return the default content type for the payload. Called when
+	 * {@link #toMessage(Object, MessageHeaders)} is invoked without
+	 * message headers or without a content type header.
+	 * <p>By default, this returns the first element of the
+	 * {@link #getSupportedMimeTypes() supportedMimeTypes}, if any.
+	 * Can be overridden in subclasses.
+	 * @param payload the payload being converted to a message
+	 * @return the content type, or {@code null} if not known
+	 */
+	@Nullable
+	protected MimeType getDefaultContentType(Object payload) {
+		List<MimeType> mimeTypes = getSupportedMimeTypes();
+		return (!mimeTypes.isEmpty() ? mimeTypes.get(0) : null);
+	}
+
 
 	/**
 	 * Whether the given class is supported by this converter.

spring-messaging/src/main/java/org/springframework/messaging/converter/MappingJackson2MessageConverter.java

@@ -43,6 +43,7 @@ import org.springframework.lang.Nullable;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageHeaders;
 import org.springframework.util.Assert;
+import org.springframework.util.ClassUtils;
 import org.springframework.util.MimeType;
 
 /**
@@ -141,6 +142,7 @@ public class MappingJackson2MessageConverter extends AbstractMessageConverter {
 		}
 	}
 
+
 	@Override
 	protected boolean canConvertFrom(Message<?> message, @Nullable Class<?> targetClass) {
 		if (targetClass == null || !supportsMimeType(message.getHeaders())) {
@@ -212,7 +214,7 @@ public class MappingJackson2MessageConverter extends AbstractMessageConverter {
 		Object payload = message.getPayload();
 		Class<?> view = getSerializationView(conversionHint);
 		try {
-			if (targetClass.isInstance(payload)) {
+			if (ClassUtils.isAssignableValue(targetClass, payload)) {
 				return payload;
 			}
 			else if (payload instanceof byte[]) {
@@ -248,7 +250,7 @@ public class MappingJackson2MessageConverter extends AbstractMessageConverter {
 			Type genericParameterType = param.getNestedGenericParameterType();
 			Class<?> contextClass = param.getContainingClass();
 			Type type = GenericTypeResolver.resolveType(genericParameterType, contextClass);
-			return this.objectMapper.getTypeFactory().constructType(type);
+			return this.objectMapper.constructType(type);
 		}
 		return this.objectMapper.constructType(targetClass);
 	}
@@ -333,7 +335,7 @@ public class MappingJackson2MessageConverter extends AbstractMessageConverter {
 	 * @return the JSON encoding to use (never {@code null})
 	 */
 	protected JsonEncoding getJsonEncoding(@Nullable MimeType contentType) {
-		if (contentType != null && (contentType.getCharset() != null)) {
+		if (contentType != null && contentType.getCharset() != null) {
 			Charset charset = contentType.getCharset();
 			for (JsonEncoding encoding : JsonEncoding.values()) {
 				if (charset.name().equals(encoding.getJavaName())) {

spring-messaging/src/main/java/org/springframework/messaging/converter/MarshallingMessageConverter.java

@@ -47,6 +47,8 @@ import org.springframework.util.MimeType;
  *
  * @author Arjen Poutsma
  * @since 4.2
+ * @see Marshaller
+ * @see Unmarshaller
  */
 public class MarshallingMessageConverter extends AbstractMessageConverter {
 
@@ -62,7 +64,8 @@ public class MarshallingMessageConverter extends AbstractMessageConverter {
 	 * {@link #setUnmarshaller(Unmarshaller)} to be invoked separately.
 	 */
 	public MarshallingMessageConverter() {
-		this(new MimeType("application", "xml"), new MimeType("text", "xml"), new MimeType("application", "*+xml"));
+		this(new MimeType("application", "xml"), new MimeType("text", "xml"),
+				new MimeType("application", "*+xml"));
 	}
 
 	/**
@@ -161,7 +164,7 @@ public class MarshallingMessageConverter extends AbstractMessageConverter {
 			return new StreamSource(new ByteArrayInputStream((byte[]) payload));
 		}
 		else {
-			return new StreamSource(new StringReader((String) payload));
+			return new StreamSource(new StringReader(payload.toString()));
 		}
 	}
 

spring-messaging/src/test/java/org/springframework/messaging/converter/MappingJackson2MessageConverterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * 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.
@@ -75,13 +75,8 @@ public class MappingJackson2MessageConverterTests {
 	@Test
 	public void fromMessage() {
 		MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter();
-		String payload = "{" +
-				"\"bytes\":\"AQI=\"," +
-				"\"array\":[\"Foo\",\"Bar\"]," +
-				"\"number\":42," +
-				"\"string\":\"Foo\"," +
-				"\"bool\":true," +
-				"\"fraction\":42.0}";
+		String payload = "{\"bytes\":\"AQI=\",\"array\":[\"Foo\",\"Bar\"]," +
+				"\"number\":42,\"string\":\"Foo\",\"bool\":true,\"fraction\":42.0}";
 		Message<?> message = MessageBuilder.withPayload(payload.getBytes(StandardCharsets.UTF_8)).build();
 		MyBean actual = (MyBean) converter.fromMessage(message, MyBean.class);
 
@@ -245,9 +240,12 @@ public class MappingJackson2MessageConverterTests {
 	public void jsonViewPayload(@JsonView(MyJacksonView2.class) JacksonViewBean payload) {
 	}
 
-	void handleList(List<Long> payload) {}
+	void handleList(List<Long> payload) {
+	}
+
+	void handleMessage(Message<MyBean> message) {
+	}
 
-	void handleMessage(Message<MyBean> message) {}
 
 	public static class MyBean {
 

spring-web/src/main/java/org/springframework/http/codec/json/AbstractJackson2Decoder.java

@@ -105,7 +105,7 @@ public abstract class AbstractJackson2Decoder extends Jackson2CodecSupport imple
 
 	@Override
 	public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) {
-		JavaType javaType = getObjectMapper().getTypeFactory().constructType(elementType.getType());
+		JavaType javaType = getObjectMapper().constructType(elementType.getType());
 		// Skip String: CharSequenceDecoder + "*/*" comes after
 		return (!CharSequence.class.isAssignableFrom(elementType.toClass()) &&
 				getObjectMapper().canDeserialize(javaType) && supportsMimeType(mimeType));

spring-web/src/main/java/org/springframework/http/codec/json/Jackson2CodecSupport.java

@@ -27,7 +27,6 @@ import java.util.Map;
 import com.fasterxml.jackson.annotation.JsonView;
 import com.fasterxml.jackson.databind.JavaType;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.type.TypeFactory;
 import org.apache.commons.logging.Log;
 
 import org.springframework.core.GenericTypeResolver;
@@ -100,8 +99,7 @@ public abstract class Jackson2CodecSupport {
 	}
 
 	protected JavaType getJavaType(Type type, @Nullable Class<?> contextClass) {
-		TypeFactory typeFactory = this.objectMapper.getTypeFactory();
-		return typeFactory.constructType(GenericTypeResolver.resolveType(type, contextClass));
+		return this.objectMapper.constructType(GenericTypeResolver.resolveType(type, contextClass));
 	}
 
 	protected Map<String, Object> getHints(ResolvableType resolvableType) {

spring-web/src/main/java/org/springframework/http/converter/HttpMessageConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * 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.
@@ -25,7 +25,7 @@ import org.springframework.http.MediaType;
 import org.springframework.lang.Nullable;
 
 /**
- * Strategy interface that specifies a converter that can convert from and to HTTP requests and responses.
+ * Strategy interface for converting from and to HTTP requests and responses.
  *
  * @author Arjen Poutsma
  * @author Juergen Hoeller
@@ -54,7 +54,7 @@ public interface HttpMessageConverter<T> {
 
 	/**
 	 * Return the list of {@link MediaType} objects supported by this converter.
-	 * @return the list of supported media types
+	 * @return the list of supported media types, potentially an immutable copy
 	 */
 	List<MediaType> getSupportedMediaTypes();
 

spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java

@@ -43,7 +43,6 @@ import com.fasterxml.jackson.databind.SerializationConfig;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.exc.InvalidDefinitionException;
 import com.fasterxml.jackson.databind.ser.FilterProvider;
-import com.fasterxml.jackson.databind.type.TypeFactory;
 
 import org.springframework.core.GenericTypeResolver;
 import org.springframework.http.HttpInputMessage;
@@ -376,8 +375,7 @@ public abstract class AbstractJackson2HttpMessageConverter extends AbstractGener
 	 * @return the Jackson JavaType
 	 */
 	protected JavaType getJavaType(Type type, @Nullable Class<?> contextClass) {
-		TypeFactory typeFactory = this.objectMapper.getTypeFactory();
-		return typeFactory.constructType(GenericTypeResolver.resolveType(type, contextClass));
+		return this.objectMapper.constructType(GenericTypeResolver.resolveType(type, contextClass));
 	}
 
 	/**

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

@@ -21,7 +21,6 @@ import java.lang.reflect.Type;
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -109,9 +108,8 @@ public class RestTemplate extends InterceptingHttpAccessor implements RestOperat
 		ClassLoader classLoader = RestTemplate.class.getClassLoader();
 		romePresent = ClassUtils.isPresent("com.rometools.rome.feed.WireFeed", classLoader);
 		jaxb2Present = ClassUtils.isPresent("javax.xml.bind.Binder", classLoader);
-		jackson2Present =
-				ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", classLoader) &&
-						ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", classLoader);
+		jackson2Present = ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", classLoader) &&
+				ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", classLoader);
 		jackson2XmlPresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.xml.XmlMapper", classLoader);
 		jackson2SmilePresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.smile.SmileFactory", classLoader);
 		jackson2CborPresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.cbor.CBORFactory", classLoader);
@@ -912,7 +910,7 @@ public class RestTemplate extends InterceptingHttpAccessor implements RestOperat
 				HttpHeaders httpHeaders = httpRequest.getHeaders();
 				HttpHeaders requestHeaders = this.requestEntity.getHeaders();
 				if (!requestHeaders.isEmpty()) {
-					requestHeaders.forEach((key, values) -> httpHeaders.put(key, new LinkedList<>(values)));
+					requestHeaders.forEach((key, values) -> httpHeaders.put(key, new ArrayList<>(values)));
 				}
 				if (httpHeaders.getContentLength() < 0) {
 					httpHeaders.setContentLength(0L);
@@ -931,7 +929,7 @@ public class RestTemplate extends InterceptingHttpAccessor implements RestOperat
 								(GenericHttpMessageConverter<Object>) messageConverter;
 						if (genericConverter.canWrite(requestBodyType, requestBodyClass, requestContentType)) {
 							if (!requestHeaders.isEmpty()) {
-								requestHeaders.forEach((key, values) -> httpHeaders.put(key, new LinkedList<>(values)));
+								requestHeaders.forEach((key, values) -> httpHeaders.put(key, new ArrayList<>(values)));
 							}
 							logBody(requestBody, requestContentType, genericConverter);
 							genericConverter.write(requestBody, requestBodyType, requestContentType, httpRequest);
@@ -940,7 +938,7 @@ public class RestTemplate extends InterceptingHttpAccessor implements RestOperat
 					}
 					else if (messageConverter.canWrite(requestBodyClass, requestContentType)) {
 						if (!requestHeaders.isEmpty()) {
-							requestHeaders.forEach((key, values) -> httpHeaders.put(key, new LinkedList<>(values)));
+							requestHeaders.forEach((key, values) -> httpHeaders.put(key, new ArrayList<>(values)));
 						}
 						logBody(requestBody, requestContentType, messageConverter);
 						((HttpMessageConverter<Object>) messageConverter).write(

spring-web/src/main/java/org/springframework/web/util/UriComponentsBuilder.java

@@ -233,7 +233,7 @@ public class UriComponentsBuilder implements UriBuilder, Cloneable {
 			}
 			builder.scheme(scheme);
 			if (opaque) {
-				String ssp = uri.substring(scheme.length()).substring(1);
+				String ssp = uri.substring(scheme.length() + 1);
 				if (StringUtils.hasLength(fragment)) {
 					ssp = ssp.substring(0, ssp.length() - (fragment.length() + 1));
 				}
@@ -394,9 +394,8 @@ public class UriComponentsBuilder implements UriBuilder, Cloneable {
 	 * characters that should have been encoded.
 	 */
 	public UriComponents build(boolean encoded) {
-		return buildInternal(encoded ?
-				EncodingHint.FULLY_ENCODED :
-				this.encodeTemplate ? EncodingHint.ENCODE_TEMPLATE : EncodingHint.NONE);
+		return buildInternal(encoded ? EncodingHint.FULLY_ENCODED :
+				(this.encodeTemplate ? EncodingHint.ENCODE_TEMPLATE : EncodingHint.NONE));
 	}
 
 	private UriComponents buildInternal(EncodingHint hint) {
@@ -408,8 +407,7 @@ public class UriComponentsBuilder implements UriBuilder, Cloneable {
 			HierarchicalUriComponents uric = new HierarchicalUriComponents(this.scheme, this.fragment,
 					this.userInfo, this.host, this.port, this.pathBuilder.build(), this.queryParams,
 					hint == EncodingHint.FULLY_ENCODED);
-
-			result = hint == EncodingHint.ENCODE_TEMPLATE ? uric.encodeTemplate(this.charset) : uric;
+			result = (hint == EncodingHint.ENCODE_TEMPLATE ? uric.encodeTemplate(this.charset) : uric);
 		}
 		if (!this.uriVariables.isEmpty()) {
 			result = result.expand(name -> this.uriVariables.getOrDefault(name, UriTemplateVariables.SKIP_VALUE));
@@ -466,9 +464,8 @@ public class UriComponentsBuilder implements UriBuilder, Cloneable {
 	 * @see UriComponents#toUriString()
 	 */
 	public String toUriString() {
-		return this.uriVariables.isEmpty() ?
-				build().encode().toUriString() :
-				buildInternal(EncodingHint.ENCODE_TEMPLATE).toUriString();
+		return (this.uriVariables.isEmpty() ? build().encode().toUriString() :
+				buildInternal(EncodingHint.ENCODE_TEMPLATE).toUriString());
 	}
 
 
@@ -849,12 +846,10 @@ public class UriComponentsBuilder implements UriBuilder, Cloneable {
 					scheme("https");
 					port(null);
 				}
-
 				String hostHeader = headers.getFirst("X-Forwarded-Host");
 				if (StringUtils.hasText(hostHeader)) {
 					adaptForwardedHost(StringUtils.tokenizeToStringArray(hostHeader, ",")[0]);
 				}
-
 				String portHeader = headers.getFirst("X-Forwarded-Port");
 				if (StringUtils.hasText(portHeader)) {
 					port(Integer.parseInt(StringUtils.tokenizeToStringArray(portHeader, ",")[0]));