blob: 92a75bedd75cbad608679d6656acb2f0907c20a7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/*
* Copyright 2002-2015 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.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.servlet.config.annotation;
import java.util.ArrayList;
import java.util.List;
import org.springframework.cache.Cache;
import org.springframework.cache.concurrent.ConcurrentMapCache;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.web.servlet.resource.CachingResourceResolver;
import org.springframework.web.servlet.resource.CachingResourceTransformer;
import org.springframework.web.servlet.resource.CssLinkResourceTransformer;
import org.springframework.web.servlet.resource.PathResourceResolver;
import org.springframework.web.servlet.resource.ResourceResolver;
import org.springframework.web.servlet.resource.ResourceTransformer;
import org.springframework.web.servlet.resource.VersionResourceResolver;
import org.springframework.web.servlet.resource.WebJarsResourceResolver;
/**
* Assists with the registration of resource resolvers and transformers.
*
* @author Rossen Stoyanchev
* @since 4.1
*/
public class ResourceChainRegistration {
private static final String DEFAULT_CACHE_NAME = "spring-resource-chain-cache";
private static final boolean isWebJarsAssetLocatorPresent = ClassUtils.isPresent(
"org.webjars.WebJarAssetLocator", ResourceChainRegistration.class.getClassLoader());
private final List<ResourceResolver> resolvers = new ArrayList<ResourceResolver>(4);
private final List<ResourceTransformer> transformers = new ArrayList<ResourceTransformer>(4);
private boolean hasVersionResolver;
private boolean hasPathResolver;
private boolean hasCssLinkTransformer;
public ResourceChainRegistration(boolean cacheResources) {
this(cacheResources, cacheResources ? new ConcurrentMapCache(DEFAULT_CACHE_NAME) : null);
}
public ResourceChainRegistration(boolean cacheResources, Cache cache) {
Assert.isTrue(!cacheResources || cache != null, "'cache' is required when cacheResources=true");
if (cacheResources) {
this.resolvers.add(new CachingResourceResolver(cache));
this.transformers.add(new CachingResourceTransformer(cache));
}
}
/**
* Add a resource resolver to the chain.
* @param resolver the resolver to add
* @return the current instance for chained method invocation
*/
public ResourceChainRegistration addResolver(ResourceResolver resolver) {
Assert.notNull(resolver, "The provided ResourceResolver should not be null");
this.resolvers.add(resolver);
if (resolver instanceof VersionResourceResolver) {
this.hasVersionResolver = true;
}
else if (resolver instanceof PathResourceResolver) {
this.hasPathResolver = true;
}
return this;
}
/**
* Add a resource transformer to the chain.
* @param transformer the transformer to add
* @return the current instance for chained method invocation
*/
public ResourceChainRegistration addTransformer(ResourceTransformer transformer) {
Assert.notNull(transformer, "The provided ResourceTransformer should not be null");
this.transformers.add(transformer);
if (transformer instanceof CssLinkResourceTransformer) {
this.hasCssLinkTransformer = true;
}
return this;
}
protected List<ResourceResolver> getResourceResolvers() {
if (!this.hasPathResolver) {
List<ResourceResolver> result = new ArrayList<ResourceResolver>(this.resolvers);
if (isWebJarsAssetLocatorPresent) {
result.add(new WebJarsResourceResolver());
}
result.add(new PathResourceResolver());
return result;
}
return this.resolvers;
}
protected List<ResourceTransformer> getResourceTransformers() {
if (this.hasVersionResolver && !this.hasCssLinkTransformer) {
List<ResourceTransformer> result = new ArrayList<ResourceTransformer>(this.transformers);
boolean hasTransformers = !this.transformers.isEmpty();
boolean hasCaching = hasTransformers && this.transformers.get(0) instanceof CachingResourceTransformer;
result.add(hasCaching ? 1 : 0, new CssLinkResourceTransformer());
return result;
}
return this.transformers;
}
}
|
