Renamed getSupportedMimeTypes() in [En|De]coder

Renamed getSupportedMimeTypes() to getEncodableMimeTypes and
getDecodableMimeTypes. This will allow for both Encoder and Decoder to
be implemented in the same class.

This issue fixes #113.

spring-web-reactive/src/main/java/org/springframework/core/codec/Decoder.java

@@ -63,6 +63,6 @@ public interface Decoder<T> {
 	/**
 	 * Return the list of MIME types this decoder supports.
 	 */
-	List<MimeType> getSupportedMimeTypes();
+	List<MimeType> getDecodableMimeTypes();
 
 }

spring-web-reactive/src/main/java/org/springframework/core/codec/Encoder.java

@@ -66,6 +66,6 @@ public interface Encoder<T> {
 	/**
 	 * Return the list of mime types this encoder supports.
 	 */
-	List<MimeType> getSupportedMimeTypes();
+	List<MimeType> getEncodableMimeTypes();
 
 }

spring-web-reactive/src/main/java/org/springframework/core/codec/support/AbstractDecoder.java

@@ -26,19 +26,20 @@ import org.springframework.util.MimeType;
 
 /**
  * @author Sebastien Deleuze
+ * @author Arjen Poutsma
  */
 public abstract class AbstractDecoder<T> implements Decoder<T> {
 
-	private List<MimeType> supportedMimeTypes = Collections.emptyList();
+	private List<MimeType> decodableMimeTypes = Collections.emptyList();
 
 	protected AbstractDecoder(MimeType... supportedMimeTypes) {
-		this.supportedMimeTypes = Arrays.asList(supportedMimeTypes);
+		this.decodableMimeTypes = Arrays.asList(supportedMimeTypes);
 	}
 
 
 	@Override
-	public List<MimeType> getSupportedMimeTypes() {
-		return this.supportedMimeTypes;
+	public List<MimeType> getDecodableMimeTypes() {
+		return this.decodableMimeTypes;
 	}
 
 	@Override
@@ -46,12 +47,8 @@ public abstract class AbstractDecoder<T> implements Decoder<T> {
 		if (mimeType == null) {
 			return true;
 		}
-		for (MimeType supportedMimeType : this.supportedMimeTypes) {
-			if (supportedMimeType.isCompatibleWith(mimeType)) {
-				return true;
-			}
-		}
-		return false;
+		return this.decodableMimeTypes.stream().
+				anyMatch(mt -> mt.isCompatibleWith(mimeType));
 	}
 
 }

spring-web-reactive/src/main/java/org/springframework/core/codec/support/AbstractEncoder.java

@@ -26,19 +26,20 @@ import org.springframework.util.MimeType;
 
 /**
  * @author Sebastien Deleuze
+ * @author Arjen Poutsma
  */
 public abstract class AbstractEncoder<T> implements Encoder<T> {
 
-	private List<MimeType> supportedMimeTypes = Collections.emptyList();
+	private List<MimeType> encodableMimeTypes = Collections.emptyList();
 
 	protected AbstractEncoder(MimeType... supportedMimeTypes) {
-		this.supportedMimeTypes = Arrays.asList(supportedMimeTypes);
+		this.encodableMimeTypes = Arrays.asList(supportedMimeTypes);
 	}
 
 
 	@Override
-	public List<MimeType> getSupportedMimeTypes() {
-		return this.supportedMimeTypes;
+	public List<MimeType> getEncodableMimeTypes() {
+		return this.encodableMimeTypes;
 	}
 
 	@Override
@@ -46,12 +47,8 @@ public abstract class AbstractEncoder<T> implements Encoder<T> {
 		if (mimeType == null) {
 			return true;
 		}
-		for (MimeType supportedMimeType : this.supportedMimeTypes) {
-			if (supportedMimeType.isCompatibleWith(mimeType)) {
-				return true;
-			}
-		}
-		return false;
+		return this.encodableMimeTypes.stream().
+				anyMatch(mt -> mt.isCompatibleWith(mimeType));
 	}
 
 }

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

@@ -18,7 +18,6 @@ package org.springframework.http.converter.reactive;
 
 import java.util.Collections;
 import java.util.List;
-import java.util.stream.Collectors;
 
 import org.reactivestreams.Publisher;
 import reactor.core.publisher.Flux;
@@ -47,6 +46,10 @@ public class CodecHttpMessageConverter<T> implements HttpMessageConverter<T> {
 
 	private final Decoder<T> decoder;
 
+	private final List<MediaType> readableMediaTypes;
+
+	private final List<MediaType> writableMediaTypes;
+
 	/**
 	 * Create a {@code CodecHttpMessageConverter} with the given {@link Encoder}. When
 	 * using this constructor, all read-related methods will in {@code false} or an
@@ -76,6 +79,13 @@ public class CodecHttpMessageConverter<T> implements HttpMessageConverter<T> {
 	public CodecHttpMessageConverter(Encoder<T> encoder, Decoder<T> decoder) {
 		this.encoder = encoder;
 		this.decoder = decoder;
+
+		this.readableMediaTypes = decoder != null ?
+				MediaTypeUtils.toMediaTypes(decoder.getDecodableMimeTypes()) :
+				Collections.emptyList();
+		this.writableMediaTypes = encoder != null ?
+				MediaTypeUtils.toMediaTypes(encoder.getEncodableMimeTypes()) :
+				Collections.emptyList();
 	}
 
 	@Override
@@ -90,16 +100,12 @@ public class CodecHttpMessageConverter<T> implements HttpMessageConverter<T> {
 
 	@Override
 	public List<MediaType> getReadableMediaTypes() {
-		return this.decoder != null ? this.decoder.getSupportedMimeTypes().stream().
-				map(MediaTypeUtils::toMediaType).
-				collect(Collectors.toList()) : Collections.emptyList();
+		return this.readableMediaTypes;
 	}
 
 	@Override
 	public List<MediaType> getWritableMediaTypes() {
-		return this.encoder != null ? this.encoder.getSupportedMimeTypes().stream().
-				map(MediaTypeUtils::toMediaType).
-				collect(Collectors.toList()) : Collections.emptyList();
+		return this.writableMediaTypes;
 	}
 
 	@Override