ProtocolResolvingResourceLoader Class — spring-boot Architecture

Source Code

core/spring-boot/src/main/java/org/springframework/boot/io/ApplicationResourceLoader.java lines 271–316

	private static class ProtocolResolvingResourceLoader implements ResourceLoader {

		private final ResourceLoader resourceLoader;

		private final List<ProtocolResolver> protocolResolvers;

		private final List<FilePathResolver> filePathResolvers;

		ProtocolResolvingResourceLoader(ResourceLoader resourceLoader, List<ProtocolResolver> protocolResolvers,
				List<FilePathResolver> filePathResolvers) {
			this.resourceLoader = resourceLoader;
			this.protocolResolvers = protocolResolvers;
			this.filePathResolvers = filePathResolvers;
		}

		@Override
		public @Nullable ClassLoader getClassLoader() {
			return this.resourceLoader.getClassLoader();
		}

		@Override
		public Resource getResource(String location) {
			if (StringUtils.hasLength(location)) {
				for (ProtocolResolver protocolResolver : this.protocolResolvers) {
					Resource resource = protocolResolver.resolve(location, this);
					if (resource != null) {
						return resource;
					}
				}
			}
			Resource resource = this.resourceLoader.getResource(location);
			String filePath = getFilePath(location, resource);
			return (filePath != null) ? new ApplicationResource(filePath) : resource;
		}

		private @Nullable String getFilePath(String location, Resource resource) {
			for (FilePathResolver filePathResolver : this.filePathResolvers) {
				String filePath = filePathResolver.resolveFilePath(location, resource);
				if (filePath != null) {
					return filePath;
				}
			}
			return null;
		}

	}