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/*
* Copyright 2013 Google Inc.
*
* 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 com.google.common.jimfs;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Supplier;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Factory for creating new files and copying files. One piece of the file store implementation.
*
* @author Colin Decker
*/
final class FileFactory {
private final AtomicInteger idGenerator = new AtomicInteger();
private final HeapDisk disk;
/** Creates a new file factory using the given disk for regular files. */
public FileFactory(HeapDisk disk) {
this.disk = checkNotNull(disk);
}
private int nextFileId() {
return idGenerator.getAndIncrement();
}
/** Creates a new directory. */
public Directory createDirectory() {
return Directory.create(nextFileId());
}
/** Creates a new root directory with the given name. */
public Directory createRootDirectory(Name name) {
return Directory.createRoot(nextFileId(), name);
}
/** Creates a new regular file. */
@VisibleForTesting
RegularFile createRegularFile() {
return RegularFile.create(nextFileId(), disk);
}
/** Creates a new symbolic link referencing the given target path. */
@VisibleForTesting
SymbolicLink createSymbolicLink(JimfsPath target) {
return SymbolicLink.create(nextFileId(), target);
}
/** Creates and returns a copy of the given file. */
public File copyWithoutContent(File file) throws IOException {
return file.copyWithoutContent(nextFileId());
}
// suppliers to act as file creation callbacks
private final Supplier<Directory> directorySupplier = new DirectorySupplier();
private final Supplier<RegularFile> regularFileSupplier = new RegularFileSupplier();
/** Returns a supplier that creates directories. */
public Supplier<Directory> directoryCreator() {
return directorySupplier;
}
/** Returns a supplier that creates regular files. */
public Supplier<RegularFile> regularFileCreator() {
return regularFileSupplier;
}
/** Returns a supplier that creates a symbolic links to the given path. */
public Supplier<SymbolicLink> symbolicLinkCreator(JimfsPath target) {
return new SymbolicLinkSupplier(target);
}
private final class DirectorySupplier implements Supplier<Directory> {
@Override
public Directory get() {
return createDirectory();
}
}
private final class RegularFileSupplier implements Supplier<RegularFile> {
@Override
public RegularFile get() {
return createRegularFile();
}
}
private final class SymbolicLinkSupplier implements Supplier<SymbolicLink> {
private final JimfsPath target;
protected SymbolicLinkSupplier(JimfsPath target) {
this.target = checkNotNull(target);
}
@Override
public SymbolicLink get() {
return createSymbolicLink(target);
}
}
}
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