spring LocationResourceLoader 源码
springboot LocationResourceLoader 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/LocationResourceLoader.java
/*
* Copyright 2012-2021 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
*
* https://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.boot.context.config;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.util.Assert;
import org.springframework.util.ResourceUtils;
import org.springframework.util.StringUtils;
/**
* Strategy interface for loading resources from a location. Supports single resource and
* simple wildcard directory patterns.
*
* @author Phillip Webb
* @author Madhura Bhave
*/
class LocationResourceLoader {
private static final Resource[] EMPTY_RESOURCES = {};
private static final Comparator<File> FILE_PATH_COMPARATOR = Comparator.comparing(File::getAbsolutePath);
private static final Comparator<File> FILE_NAME_COMPARATOR = Comparator.comparing(File::getName);
private final ResourceLoader resourceLoader;
/**
* Create a new {@link LocationResourceLoader} instance.
* @param resourceLoader the underlying resource loader
*/
LocationResourceLoader(ResourceLoader resourceLoader) {
this.resourceLoader = resourceLoader;
}
/**
* Returns if the location contains a pattern.
* @param location the location to check
* @return if the location is a pattern
*/
boolean isPattern(String location) {
return StringUtils.hasLength(location) && location.contains("*");
}
/**
* Get a single resource from a non-pattern location.
* @param location the location
* @return the resource
* @see #isPattern(String)
*/
Resource getResource(String location) {
validateNonPattern(location);
location = StringUtils.cleanPath(location);
if (!ResourceUtils.isUrl(location)) {
location = ResourceUtils.FILE_URL_PREFIX + location;
}
return this.resourceLoader.getResource(location);
}
private void validateNonPattern(String location) {
Assert.state(!isPattern(location), () -> String.format("Location '%s' must not be a pattern", location));
}
/**
* Get a multiple resources from a location pattern.
* @param location the location pattern
* @param type the type of resource to return
* @return the resources
* @see #isPattern(String)
*/
Resource[] getResources(String location, ResourceType type) {
validatePattern(location, type);
String directoryPath = location.substring(0, location.indexOf("*/"));
String fileName = location.substring(location.lastIndexOf("/") + 1);
Resource resource = getResource(directoryPath);
if (!resource.exists()) {
return EMPTY_RESOURCES;
}
File file = getFile(location, resource);
if (!file.isDirectory()) {
return EMPTY_RESOURCES;
}
File[] subDirectories = file.listFiles(this::isVisibleDirectory);
if (subDirectories == null) {
return EMPTY_RESOURCES;
}
Arrays.sort(subDirectories, FILE_PATH_COMPARATOR);
if (type == ResourceType.DIRECTORY) {
return Arrays.stream(subDirectories).map(FileSystemResource::new).toArray(Resource[]::new);
}
List<Resource> resources = new ArrayList<>();
FilenameFilter filter = (dir, name) -> name.equals(fileName);
for (File subDirectory : subDirectories) {
File[] files = subDirectory.listFiles(filter);
if (files != null) {
Arrays.sort(files, FILE_NAME_COMPARATOR);
Arrays.stream(files).map(FileSystemResource::new).forEach(resources::add);
}
}
return resources.toArray(EMPTY_RESOURCES);
}
private void validatePattern(String location, ResourceType type) {
Assert.state(isPattern(location), () -> String.format("Location '%s' must be a pattern", location));
Assert.state(!location.startsWith(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX),
() -> String.format("Location '%s' cannot use classpath wildcards", location));
Assert.state(StringUtils.countOccurrencesOf(location, "*") == 1,
() -> String.format("Location '%s' cannot contain multiple wildcards", location));
String directoryPath = (type != ResourceType.DIRECTORY) ? location.substring(0, location.lastIndexOf("/") + 1)
: location;
Assert.state(directoryPath.endsWith("*/"), () -> String.format("Location '%s' must end with '*/'", location));
}
private File getFile(String patternLocation, Resource resource) {
try {
return resource.getFile();
}
catch (Exception ex) {
throw new IllegalStateException(
"Unable to load config data resource from pattern '" + patternLocation + "'", ex);
}
}
private boolean isVisibleDirectory(File file) {
return file.isDirectory() && !file.getName().startsWith("..");
}
/**
* Resource types that can be returned.
*/
enum ResourceType {
/**
* Return file resources.
*/
FILE,
/**
* Return directory resources.
*/
DIRECTORY
}
}
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