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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.application;
import com.yahoo.yolean.function.ThrowingFunction;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Optional;
import java.util.function.Predicate;
/**
* Wraps a real or virtual file system — essentially a mapping from paths to bytes.
*
* @author jonmv
*/
public class FileSystemWrapper {
final Path root;
final Predicate<Path> existence;
final ThrowingFunction<Path, byte[], IOException> reader;
private FileSystemWrapper(Path root, Predicate<Path> existence, ThrowingFunction<Path, byte[], IOException> reader) {
this.root = root;
this.existence = existence;
this.reader = reader;
}
public static FileSystemWrapper ofFiles(Path root, Predicate<Path> existence, ThrowingFunction<Path, byte[], IOException> reader) {
return new FileSystemWrapper(root, existence, reader);
}
public static FileSystemWrapper getDefault(Path root) {
return ofFiles(root, Files::exists, Files::readAllBytes);
}
public FileWrapper wrap(Path path) {
return new FileWrapper(path);
}
public class FileWrapper {
private final Path path;
private FileWrapper(Path path) {
Path relative = root.relativize(path).normalize();
if (relative.isAbsolute() || relative.startsWith(".."))
throw new IllegalArgumentException(path + " is not a descendant of " + root);
this.path = path;
}
public Path path() { return path; }
public boolean exists() { return existence.test(path); }
public byte[] content() throws IOException { return reader.apply(path); }
public Optional<FileWrapper> parent() { return Optional.ofNullable(path.getParent()).map(path -> wrap(path)); }
public FileWrapper child(String name) { return wrap(path.resolve(name)); }
}
}
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