/
IoUtils.java
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/
IoUtils.java
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/*
* Copyright (C) 2010 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.integralblue.compat.libcore.io;
import java.io.Closeable;
import java.io.File;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.net.Socket;
import com.integralblue.compat.Charsets;
import com.integralblue.compat.java.lang.UnsafeByteSequence;
import static com.integralblue.compat.libcore.io.OsConstants.*;
public final class IoUtils {
private IoUtils() {
}
/**
* Calls close(2) on 'fd'. Also resets the internal int to -1. Does nothing if 'fd' is null
* or invalid.
*/
public static void close(FileDescriptor fd) throws IOException {
try {
if (fd != null && fd.valid()) {
Libcore.os.close(fd);
}
} catch (ErrnoException errnoException) {
throw errnoException.rethrowAsIOException();
}
}
/**
* Closes 'closeable', ignoring any checked exceptions. Does nothing if 'closeable' is null.
*/
public static void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (RuntimeException rethrown) {
throw rethrown;
} catch (Exception ignored) {
}
}
}
/**
* Closes 'fd', ignoring any exceptions. Does nothing if 'fd' is null or invalid.
*/
public static void closeQuietly(FileDescriptor fd) {
try {
IoUtils.close(fd);
} catch (IOException ignored) {
}
}
/**
* Closes 'socket', ignoring any exceptions. Does nothing if 'socket' is null.
*/
public static void closeQuietly(Socket socket) {
if (socket != null) {
try {
socket.close();
} catch (Exception ignored) {
}
}
}
/**
* Sets 'fd' to be blocking or non-blocking, according to the state of 'blocking'.
*/
public static void setBlocking(FileDescriptor fd, boolean blocking) throws IOException {
try {
int flags = Libcore.os.fcntlVoid(fd, F_GETFL);
if (!blocking) {
flags |= O_NONBLOCK;
} else {
flags &= ~O_NONBLOCK;
}
Libcore.os.fcntlLong(fd, F_SETFL, flags);
} catch (ErrnoException errnoException) {
throw errnoException.rethrowAsIOException();
}
}
/**
* Returns the contents of 'path' as a byte array.
*/
public static byte[] readFileAsByteArray(String path) throws IOException {
return readFileAsBytes(path).toByteArray();
}
/**
* Returns the contents of 'path' as a string. The contents are assumed to be UTF-8.
*/
public static String readFileAsString(String path) throws IOException {
return readFileAsBytes(path).toString(Charsets.UTF_8);
}
private static UnsafeByteSequence readFileAsBytes(String path) throws IOException {
RandomAccessFile f = null;
try {
f = new RandomAccessFile(path, "r");
UnsafeByteSequence bytes = new UnsafeByteSequence((int) f.length());
byte[] buffer = new byte[8192];
while (true) {
int byteCount = f.read(buffer);
if (byteCount == -1) {
return bytes;
}
bytes.write(buffer, 0, byteCount);
}
} finally {
IoUtils.closeQuietly(f);
}
}
/**
* Recursively delete everything in {@code dir}.
*/
// TODO: this should specify paths as Strings rather than as Files
public static void deleteContents(File dir) throws IOException {
File[] files = dir.listFiles();
if (files == null) {
throw new IllegalArgumentException("not a directory: " + dir);
}
for (File file : files) {
if (file.isDirectory()) {
deleteContents(file);
}
if (!file.delete()) {
throw new IOException("failed to delete file: " + file);
}
}
}
}