Package libcore.io

Class IoUtils

java.lang.Object

libcore.io.IoUtils

public final class IoUtils
extends Object

Method Summary

Modifier and Type	Method	Description
static boolean	canOpenReadOnly(String path)	Do not use.
static void	close(FileDescriptor fd)	Calls close(2) on 'fd'.
static void	closeQuietly(FileDescriptor fd)	Closes 'fd', ignoring any exceptions.
static void	closeQuietly(AutoCloseable closeable)	Closes 'closeable', ignoring any checked exceptions.
static void	closeQuietly(Socket socket)	Closes 'socket', ignoring any exceptions.
static File	createTemporaryDirectory(String prefix)	Creates a unique new temporary directory under "java.io.tmpdir".
static void	deleteContents(File dir)	Deprecated. Use createTemporaryDirectory(java.lang.String) instead.
static byte[]	readFileAsByteArray(String absolutePath)	Returns the contents of 'path' as a byte array.
static String	readFileAsString(String absolutePath)	Returns the contents of 'path' as a string.
static void	setBlocking(FileDescriptor fd, boolean blocking)	Sets 'fd' to be blocking or non-blocking, according to the state of 'blocking'.
static void	throwInterruptedIoException()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

close

public static void close(FileDescriptor fd)
                  throws IOException

Calls close(2) on 'fd'. Also resets the internal int to -1. Does nothing if 'fd' is null or invalid.

Throws:

IOException

closeQuietly

public static void closeQuietly(AutoCloseable closeable)

Closes 'closeable', ignoring any checked exceptions. Does nothing if 'closeable' is null.

closeQuietly

public static void closeQuietly(FileDescriptor fd)

Closes 'fd', ignoring any exceptions. Does nothing if 'fd' is null or invalid.

closeQuietly

public static void closeQuietly(Socket socket)

Closes 'socket', ignoring any exceptions. Does nothing if 'socket' is null.

setBlocking

public static void setBlocking(FileDescriptor fd,
boolean blocking)
                        throws IOException

Sets 'fd' to be blocking or non-blocking, according to the state of 'blocking'.

Throws:

IOException

readFileAsByteArray

public static byte[] readFileAsByteArray(String absolutePath)
                                  throws IOException

Returns the contents of 'path' as a byte array.

Throws:

IOException

readFileAsString

public static String readFileAsString(String absolutePath)
                               throws IOException

Returns the contents of 'path' as a string. The contents are assumed to be UTF-8.

Throws:

IOException

deleteContents

public static void deleteContents(File dir)
                           throws IOException

Deprecated.

Use createTemporaryDirectory(java.lang.String) instead.

Do not use. Use createTemporaryDirectory instead. Used by frameworks/base unit tests to clean up a temporary directory. Deliberately ignores errors, on the assumption that test cleanup is only supposed to be best-effort.

Throws:

IOException

createTemporaryDirectory

public static File createTemporaryDirectory(String prefix)

Creates a unique new temporary directory under "java.io.tmpdir".

canOpenReadOnly

public static boolean canOpenReadOnly(String path)

Do not use. This is for System.loadLibrary use only. Checks whether path can be opened read-only. Similar to File.exists, but doesn't require read permission on the parent, so it'll work in more cases, and allow you to remove read permission from more directories. Everyone else should just open(2) and then use the fd, but the loadLibrary API is broken by its need to ask ClassLoaders where to find a .so rather than just calling dlopen(3).

throwInterruptedIoException

public static void throwInterruptedIoException()
                                        throws InterruptedIOException

Throws:

InterruptedIOException