1 /* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.os; 18 19 /** 20 * Retrieve overall information about the space on a filesystem. This is a 21 * Wrapper for Unix statfs(). 22 */ 23 public class StatFs { 24 /** 25 * Construct a new StatFs for looking at the stats of the 26 * filesystem at <var>path</var>. Upon construction, the stat of 27 * the file system will be performed, and the values retrieved available 28 * from the methods on this class. 29 * 30 * @param path A path in the desired file system to state. 31 */ 32 public StatFs(String path) { native_setup(path); } 33 34 /** 35 * Perform a restat of the file system referenced by this object. This 36 * is the same as re-constructing the object with the same file system 37 * path, and the new stat values are available upon return. 38 */ 39 public void restat(String path) { native_restat(path); } 40 41 @Override 42 protected void finalize() { native_finalize(); } 43 44 /** 45 * The size, in bytes, of a block on the file system. This corresponds 46 * to the Unix statfs.f_bsize field. 47 */ 48 public native int getBlockSize(); 49 50 /** 51 * The total number of blocks on the file system. This corresponds 52 * to the Unix statfs.f_blocks field. 53 */ 54 public native int getBlockCount(); 55 56 /** 57 * The total number of blocks that are free on the file system, including 58 * reserved blocks (that are not available to normal applications). This 59 * corresponds to the Unix statfs.f_bfree field. Most applications will 60 * want to use {@link #getAvailableBlocks()} instead. 61 */ 62 public native int getFreeBlocks(); 63 64 /** 65 * The number of blocks that are free on the file system and available to 66 * applications. This corresponds to the Unix statfs.f_bavail field. 67 */ 68 public native int getAvailableBlocks(); 69 70 private int mNativeContext; 71 private native void native_restat(String path); 72 private native void native_setup(String path); 73 private native void native_finalize(); 74 } 75
