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Make sure that MediaType comparators are transitive 

Previous to this commit, the specificity and quality comparators
(used by MediaType::sortByQualityValue and MediaType::sortBySpecificity)
could result in IllegalArgumentExceptions when used for sorting.
The underlying reason was that the comparators were not transitive, and
both media types with the same type, and types with the same amount of
parameters, would be considered identical by the comparator (result 0).

This commit ensures that the comparators are transitive.

Closes gh-27488
This commit is contained in:
Arjen Poutsma 2021-09-30 16:15:38 +02:00
parent 96e4d3a530
commit 388c8e4aa5
2 changed files with 0 additions and 12 deletions
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6
spring-core/src/main/java/org/springframework/util/MimeType.java
View File

@ -637,9 +637,6 @@ public class MimeType implements Comparable<MimeType>, Serializable {
else if (mimeType2.isWildcardType() && !mimeType1.isWildcardType()) { // audio/* > */*
return -1;
}
else if (!mimeType1.getType().equals(mimeType2.getType())) { // audio/basic == text/html
return 0;
}
else { // mediaType1.getType().equals(mediaType2.getType())
if (mimeType1.isWildcardSubtype() && !mimeType2.isWildcardSubtype()) { // audio/* < audio/basic
return 1;
@ -647,9 +644,6 @@ public class MimeType implements Comparable<MimeType>, Serializable {
else if (mimeType2.isWildcardSubtype() && !mimeType1.isWildcardSubtype()) { // audio/basic > audio/*
return -1;
}
else if (!mimeType1.getSubtype().equals(mimeType2.getSubtype())) { // audio/basic == audio/wave
return 0;
}
else { // mediaType2.getSubtype().equals(mediaType2.getSubtype())
return compareParameters(mimeType1, mimeType2);
}

6
spring-web/src/main/java/org/springframework/http/MediaType.java
View File

@ -798,9 +798,6 @@ public class MediaType extends MimeType implements Serializable {
else if (mediaType2.isWildcardType() && !mediaType1.isWildcardType()) { // audio/* > */*
return -1;
}
else if (!mediaType1.getType().equals(mediaType2.getType())) { // audio/basic == text/html
return 0;
}
else { // mediaType1.getType().equals(mediaType2.getType())
if (mediaType1.isWildcardSubtype() && !mediaType2.isWildcardSubtype()) { // audio/* < audio/basic
return 1;
@ -808,9 +805,6 @@ public class MediaType extends MimeType implements Serializable {
else if (mediaType2.isWildcardSubtype() && !mediaType1.isWildcardSubtype()) { // audio/basic > audio/*
return -1;
}
else if (!mediaType1.getSubtype().equals(mediaType2.getSubtype())) { // audio/basic == audio/wave
return 0;
}
else {
int paramsSize1 = mediaType1.getParameters().size();
int paramsSize2 = mediaType2.getParameters().size();