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/*
* Copyright (C) 2013 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.util.file;
import com.android.sched.util.RunnableHooks;
import com.android.sched.util.location.HasLocation;
import com.android.sched.util.location.Location;
import com.android.sched.util.location.NoLocation;
import com.android.sched.util.log.LoggerFactory;
import java.io.File;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
/**
* Abstract class for file or directory which manage the underlying state
* of the file system.
*/
public abstract class FileOrDirectory implements HasLocation {
@Nonnull
private static final Logger logger = LoggerFactory.getLogger();
/**
* Permission
*/
public static class Permission {
public static final int READ = 1 << 0;
public static final int WRITE = 1 << 1;
public static final int EXECUTE = 1 << 2;
}
/**
* Change Permission
*/
public enum ChangePermission {
NOCHANGE,
OWNER,
EVERYBODY
}
/**
* Existing condition
*/
public enum Existence {
MUST_EXIST,
NOT_EXIST,
MAY_EXIST
}
@Nonnull
private static final Location NO_LOCATION = new NoLocation();
@Nonnull
protected Location location = NO_LOCATION;
@CheckForNull
private RunnableHooks hooks;
@CheckForNull
private Runnable remover;
protected FileOrDirectory(@CheckForNull RunnableHooks hooks) {
this.hooks = hooks;
}
@Override
@Nonnull
public Location getLocation() {
return location;
}
@Nonnull
public abstract String getPath();
public static void setPermissions(@Nonnull File file, @Nonnull Location location,
int permissions, @Nonnull FileOrDirectory.ChangePermission change)
throws CannotSetPermissionException {
if (change != ChangePermission.NOCHANGE) {
// Set access
if ((permissions & Permission.READ) != 0) {
if (file.setReadable(true, change == ChangePermission.OWNER)) {
logger.log(Level.FINE, "Set readable permission to {0} (''{1}'')",
new Object[] {location.getDescription(), file.getAbsoluteFile()});
} else {
throw new CannotSetPermissionException(location, Permission.READ,
change);
}
}
if ((permissions & Permission.WRITE) != 0) {
if (file.setWritable(true, change == ChangePermission.OWNER)) {
logger.log(Level.FINE, "Set writable permission to {0} (''{1}'')",
new Object[] {location.getDescription(), file.getAbsoluteFile()});
} else {
throw new CannotSetPermissionException(location, Permission.WRITE,
change);
}
}
if ((permissions & Permission.EXECUTE) != 0) {
if (file.setExecutable(true, change == ChangePermission.OWNER)) {
logger.log(Level.FINE, "Set executable permission to {0} (''{1}'')",
new Object[] {location.getDescription(), file.getAbsoluteFile()});
} else {
throw new CannotSetPermissionException(location, Permission.EXECUTE,
change);
}
}
}
}
public static void unsetPermissions(@Nonnull File file, @Nonnull Location location,
int permissions, @Nonnull FileOrDirectory.ChangePermission change)
throws CannotSetPermissionException {
if (change != ChangePermission.NOCHANGE) {
// Set access
if ((permissions & Permission.READ) != 0) {
if (file.setReadable(false, change == ChangePermission.OWNER)) {
logger.log(Level.FINE, "Clear readable permission to {0} (''{1}'')",
new Object[] {location.getDescription(), file.getAbsoluteFile()});
} else {
throw new CannotSetPermissionException(location, Permission.READ,
change);
}
}
if ((permissions & Permission.WRITE) != 0) {
if (file.setWritable(false, change == ChangePermission.OWNER)) {
logger.log(Level.FINE, "Clear writable permission to {0} (''{1}'')",
new Object[] {location.getDescription(), file.getAbsoluteFile()});
} else {
throw new CannotSetPermissionException(location, Permission.WRITE,
change);
}
}
if ((permissions & Permission.EXECUTE) != 0) {
if (file.setExecutable(false, change == ChangePermission.OWNER)) {
logger.log(Level.FINE, "Clear executable permission to {0} (''{1}'')",
new Object[] {location.getDescription(), file.getAbsoluteFile()});
} else {
throw new CannotSetPermissionException(location, Permission.EXECUTE,
change);
}
}
}
}
public static void checkPermissions(@Nonnull File file, @Nonnull Location location,
int permissions) throws WrongPermissionException {
if ((permissions & Permission.READ) != 0) {
if (!file.canRead()) {
throw new WrongPermissionException(location, Permission.READ);
}
}
if ((permissions & Permission.WRITE) != 0) {
if (!file.canWrite()) {
throw new WrongPermissionException(location, Permission.WRITE);
}
}
if ((permissions & Permission.EXECUTE) != 0) {
if (!file.canExecute()) {
throw new WrongPermissionException(location, Permission.EXECUTE);
}
}
}
protected synchronized void addRemover(@Nonnull final File file) {
assert remover == null;
if (hooks != null) {
remover = new Runnable() {
@Override
public void run() {
if (file.delete()) {
logger.log(Level.FINE, "Remove {0} (''{1}'')",
new Object[] {location.getDescription(), file.getAbsoluteFile()});
} else {
logger.log(Level.SEVERE,
"Can not delete {0}",
location.getDescription());
}
}
};
assert hooks != null;
hooks.addHook(remover);
}
}
protected synchronized void clearRemover() {
if (remover != null) {
assert hooks != null;
hooks.removeHook(remover);
remover = null;
hooks = null;
}
}
@Nonnull
public static File getFileFromWorkingDirectory(@CheckForNull Directory workingDirectory,
@Nonnull String path) {
File fileWithoutWorkingDir = new File(path);
if (workingDirectory != null && !fileWithoutWorkingDir.isAbsolute()) {
return new File(workingDirectory.getFile(), path);
} else {
return fileWithoutWorkingDir;
}
}
}
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