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/*
* Copyright (C) 2007 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 android.os;
import libcore.io.ErrnoException;
import libcore.io.Libcore;
import libcore.io.StructStatFs;
/**
* Retrieve overall information about the space on a filesystem. This is a
* wrapper for Unix statfs().
*/
public class StatFs {
private StructStatFs mStat;
/**
* Construct a new StatFs for looking at the stats of the filesystem at
* {@code path}. Upon construction, the stat of the file system will be
* performed, and the values retrieved available from the methods on this
* class.
*
* @param path path in the desired file system to stat.
*/
public StatFs(String path) {
mStat = doStat(path);
}
private static StructStatFs doStat(String path) {
try {
return Libcore.os.statfs(path);
} catch (ErrnoException e) {
throw new IllegalArgumentException("Invalid path: " + path, e);
}
}
/**
* Perform a restat of the file system referenced by this object. This is
* the same as re-constructing the object with the same file system path,
* and the new stat values are available upon return.
*/
public void restat(String path) {
mStat = doStat(path);
}
/**
* The size, in bytes, of a block on the file system. This corresponds to
* the Unix {@code statfs.f_bsize} field.
*/
public int getBlockSize() {
return (int) mStat.f_bsize;
}
/**
* The total number of blocks on the file system. This corresponds to the
* Unix {@code statfs.f_blocks} field.
*/
public int getBlockCount() {
return (int) mStat.f_blocks;
}
/**
* The total number of blocks that are free on the file system, including
* reserved blocks (that are not available to normal applications). This
* corresponds to the Unix {@code statfs.f_bfree} field. Most applications
* will want to use {@link #getAvailableBlocks()} instead.
*/
public int getFreeBlocks() {
return (int) mStat.f_bfree;
}
/**
* The number of blocks that are free on the file system and available to
* applications. This corresponds to the Unix {@code statfs.f_bavail} field.
*/
public int getAvailableBlocks() {
return (int) mStat.f_bavail;
}
}
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