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Avoid ConstantConditions warnings suppression (plus related polishing)

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Issue: SPR-15756
This commit is contained in:
Juergen Hoeller
2018-05-29 21:47:10 +02:00
parent 8c30b8e628
commit 8593fec22c
12 changed files with 78 additions and 92 deletions
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23
spring-webflux/src/main/java/org/springframework/web/reactive/resource/DefaultResourceResolverChain.java
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@@ -44,7 +44,7 @@ class DefaultResourceResolverChain implements ResourceResolverChain {
public DefaultResourceResolverChain(@Nullable List<? extends ResourceResolver> resolvers) {
resolvers = resolvers != null ? resolvers : Collections.emptyList();
resolvers = (resolvers != null ? resolvers : Collections.emptyList());
DefaultResourceResolverChain chain = initChain(new ArrayList<>(resolvers));
this.resolver = chain.resolver;
this.nextChain = chain.nextChain;
@@ -52,40 +52,35 @@ class DefaultResourceResolverChain implements ResourceResolverChain {
private static DefaultResourceResolverChain initChain(ArrayList<? extends ResourceResolver> resolvers) {
DefaultResourceResolverChain chain = new DefaultResourceResolverChain(null, null);
ListIterator<? extends ResourceResolver> itr = resolvers.listIterator(resolvers.size());
while (itr.hasPrevious()) {
chain = new DefaultResourceResolverChain(itr.previous(), chain);
ListIterator<? extends ResourceResolver> it = resolvers.listIterator(resolvers.size());
while (it.hasPrevious()) {
chain = new DefaultResourceResolverChain(it.previous(), chain);
}
return chain;
}
private DefaultResourceResolverChain(@Nullable ResourceResolver resolver,
@Nullable ResourceResolverChain chain) {
private DefaultResourceResolverChain(@Nullable ResourceResolver resolver, @Nullable ResourceResolverChain chain) {
Assert.isTrue((resolver == null && chain == null) || (resolver != null && chain != null),
"Both resolver and resolver chain must be null, or neither is");
this.resolver = resolver;
this.nextChain = chain;
}
@Override
@SuppressWarnings("ConstantConditions")
public Mono<Resource> resolveResource(@Nullable ServerWebExchange exchange, String requestPath,
List<? extends Resource> locations) {
return this.resolver != null ?
return (this.resolver != null && this.nextChain != null ?
this.resolver.resolveResource(exchange, requestPath, locations, this.nextChain) :
Mono.empty();
Mono.empty());
}
@Override
@SuppressWarnings("ConstantConditions")
public Mono<String> resolveUrlPath(String resourcePath, List<? extends Resource> locations) {
return this.resolver != null ?
return (this.resolver != null && this.nextChain != null ?
this.resolver.resolveUrlPath(resourcePath, locations, this.nextChain) :
Mono.empty();
Mono.empty());
}
}

24
spring-webflux/src/main/java/org/springframework/web/reactive/resource/DefaultResourceTransformerChain.java
View File

@@ -45,13 +45,12 @@ class DefaultResourceTransformerChain implements ResourceTransformerChain {
private final ResourceTransformerChain nextChain;
public DefaultResourceTransformerChain(ResourceResolverChain resolverChain,
@Nullable List<ResourceTransformer> transformers) {
public DefaultResourceTransformerChain(
ResourceResolverChain resolverChain, @Nullable List<ResourceTransformer> transformers) {
Assert.notNull(resolverChain, "ResourceResolverChain is required");
this.resolverChain = resolverChain;
transformers = transformers != null ? transformers : Collections.emptyList();
transformers = (transformers != null ? transformers : Collections.emptyList());
DefaultResourceTransformerChain chain = initTransformerChain(resolverChain, new ArrayList<>(transformers));
this.transformer = chain.transformer;
this.nextChain = chain.nextChain;
@@ -61,9 +60,9 @@ class DefaultResourceTransformerChain implements ResourceTransformerChain {
ArrayList<ResourceTransformer> transformers) {
DefaultResourceTransformerChain chain = new DefaultResourceTransformerChain(resolverChain, null, null);
ListIterator<? extends ResourceTransformer> itr = transformers.listIterator(transformers.size());
while (itr.hasPrevious()) {
chain = new DefaultResourceTransformerChain(resolverChain, itr.previous(), chain);
ListIterator<? extends ResourceTransformer> it = transformers.listIterator(transformers.size());
while (it.hasPrevious()) {
chain = new DefaultResourceTransformerChain(resolverChain, it.previous(), chain);
}
return chain;
}
@@ -73,23 +72,22 @@ class DefaultResourceTransformerChain implements ResourceTransformerChain {
Assert.isTrue((transformer == null && chain == null) || (transformer != null && chain != null),
"Both transformer and transformer chain must be null, or neither is");
this.resolverChain = resolverChain;
this.transformer = transformer;
this.nextChain = chain;
}
@Override
public ResourceResolverChain getResolverChain() {
return this.resolverChain;
}
@Override
@SuppressWarnings("ConstantConditions")
public Mono<Resource> transform(ServerWebExchange exchange, Resource resource) {
return this.transformer != null ?
return (this.transformer != null && this.nextChain != null ?
this.transformer.transform(exchange, resource, this.nextChain) :
Mono.just(resource);
Mono.just(resource));
}
}
}