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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.android.sched.vfs;
import com.android.sched.util.file.CannotCreateFileException;
import com.android.sched.util.file.CannotDeleteFileException;
import com.android.sched.util.file.NoSuchFileException;
import com.android.sched.util.file.NotDirectoryException;
import com.android.sched.util.file.NotFileException;
import com.android.sched.util.file.WrongPermissionException;
import com.android.sched.util.location.Location;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collection;
import java.util.Set;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
import javax.annotation.Nonnull;
/**
* A {@link VFS} filter implementation which inflate/deflate individual file.
*/
public class DeflateFS extends BaseVFS<BaseVDir, BaseVFile> implements VFS{
@Nonnull
private final BaseVFS<BaseVDir, BaseVFile> vfs;
@SuppressWarnings("unchecked")
public DeflateFS(@Nonnull VFS vfs) {
this.vfs = (BaseVFS<BaseVDir, BaseVFile>) vfs;
changeVFS(this.vfs.getRootDir());
}
@Override
@Nonnull
public String getDescription() {
return "deflater wrapper";
}
@Override
@Nonnull
public Set<Capabilities> getCapabilities() {
return vfs.getCapabilities();
}
@Override
@Nonnull
public Location getLocation() {
return vfs.getLocation();
}
@Override
public void close() throws IOException {
vfs.close();
}
@Override
@Nonnull
public String getPath() {
return vfs.getPath();
}
@Override
@Nonnull
public BaseVDir getRootDir() {
return vfs.getRootDir();
}
@Override
@Nonnull
InputStream openRead(@Nonnull BaseVFile file) throws WrongPermissionException {
return new InflaterInputStream(vfs.openRead(file), new Inflater());
}
@Override
@Nonnull
OutputStream openWrite(@Nonnull BaseVFile file) throws WrongPermissionException {
return new DeflaterOutputStream(vfs.openWrite(file), new Deflater());
}
@Override
@Nonnull
void delete(@Nonnull BaseVFile file) throws CannotDeleteFileException {
vfs.delete(file);
}
@Override
@Nonnull
Collection<? extends BaseVElement> list(@Nonnull BaseVDir dir) {
Collection<? extends BaseVElement> elements = vfs.list(dir);
for (BaseVElement element : elements) {
element.changeVFS(this);
}
return elements;
}
@Override
boolean isEmpty(@Nonnull BaseVDir dir) {
return vfs.isEmpty(dir);
}
@Override
@Nonnull
BaseVFile createVFile(@Nonnull BaseVDir parent, @Nonnull String name)
throws CannotCreateFileException {
return changeVFS(vfs.createVFile(parent, name));
}
@Override
@Nonnull
BaseVDir createVDir(@Nonnull BaseVDir parent, @Nonnull String name)
throws CannotCreateFileException {
return changeVFS(vfs.createVDir(parent, name));
}
@Override
@Nonnull
BaseVDir getVDir(@Nonnull BaseVDir parent, @Nonnull String name) throws NotDirectoryException,
NoSuchFileException {
return changeVFS(vfs.getVDir(parent, name));
}
@Override
@Nonnull
BaseVFile getVFile(@Nonnull BaseVDir parent, @Nonnull String name) throws NotFileException,
NoSuchFileException {
return changeVFS(vfs.getVFile(parent, name));
}
@Nonnull
private BaseVFile changeVFS(@Nonnull BaseVFile file) {
file.changeVFS(this);
return file;
}
@Nonnull
private BaseVDir changeVFS(@Nonnull BaseVDir dir) {
dir.changeVFS(this);
return dir;
}
@Override
public boolean needsSequentialWriting() {
return vfs.needsSequentialWriting();
}
@Override
@Nonnull
Location getVFileLocation(@Nonnull BaseVFile file) {
return vfs.getVFileLocation(file);
}
@Override
@Nonnull
Location getVFileLocation(@Nonnull BaseVDir parent, @Nonnull String name) {
return vfs.getVFileLocation(parent, name);
}
@Override
@Nonnull
Location getVDirLocation(@Nonnull BaseVDir dir) {
return vfs.getVDirLocation(dir);
}
@Override
@Nonnull
Location getVDirLocation(@Nonnull BaseVDir parent, @Nonnull String name) {
return vfs.getVDirLocation(parent, name);
}
@Override
@Nonnull
Location getVFileLocation(@Nonnull BaseVDir parent, @Nonnull VPath path) {
return vfs.getVFileLocation(parent, path);
}
@Override
@Nonnull
Location getVDirLocation(@Nonnull BaseVDir parent, @Nonnull VPath path) {
return vfs.getVDirLocation(parent, path);
}
@Override
@Nonnull
VPath getPathFromDir(@Nonnull BaseVDir parent, @Nonnull BaseVFile file) {
return vfs.getPathFromDir(parent, file);
}
@Override
@Nonnull
VPath getPathFromRoot(@Nonnull BaseVFile file) {
return vfs.getPathFromRoot(file);
}
}
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