com.qcloud.cos.utils

Enum IOUtils

java.lang.Object

java.lang.Enum<IOUtils>

com.qcloud.cos.utils.IOUtils

All Implemented Interfaces:

Serializable, Comparable<IOUtils>

public enum IOUtils
extends Enum<IOUtils>

Utilities for IO operations.

Method Summary

Modifier and Type	Method and Description
static void	closeQuietly(Closeable is, org.slf4j.Logger log) Closes the given Closeable quietly.
static long	copy(InputStream in, OutputStream out) Copies all bytes from the given input stream to the given output stream.
static void	drainInputStream(InputStream in) Read all remaining data in the stream.
static void	release(Closeable is, org.slf4j.Logger log) Releases the given Closeable especially if it was an instance of Releasable.
static byte[]	toByteArray(InputStream is) Reads and returns the rest of the given input stream as a byte array.
static String	toString(InputStream is) Reads and returns the rest of the given input stream as a string.
static IOUtils	valueOf(String name) Returns the enum constant of this type with the specified name.
static IOUtils[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Method Detail

values

public static IOUtils[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (IOUtils c : IOUtils.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static IOUtils valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

toByteArray

public static byte[] toByteArray(InputStream is)
                          throws IOException

Reads and returns the rest of the given input stream as a byte array. Caller is responsible for closing the given input stream.

Throws:

IOException

toString

public static String toString(InputStream is)
                       throws IOException

Reads and returns the rest of the given input stream as a string. Caller is responsible for closing the given input stream.

Throws:

IOException

closeQuietly

public static void closeQuietly(Closeable is,
                                org.slf4j.Logger log)

Closes the given Closeable quietly.

Parameters:

is - the given closeable

log - logger used to log any failure should the close fail

release

public static void release(Closeable is,
                           org.slf4j.Logger log)

Releases the given Closeable especially if it was an instance of Releasable.

For example, the creation of a ResettableInputStream would entail physically opening a file. If the opened file is meant to be closed only (in a finally block) by the very same code block that created it, then it is necessary that the release method must not be called while the execution is made in other stack frames. In such case, as other stack frames may inadvertently or indirectly call the close method of the stream, the creator of the stream would need to explicitly disable the accidental closing via ResettableInputStream#disableClose(), so that the release method becomes the only way to truly close the opened file.

copy

public static long copy(InputStream in,
                        OutputStream out)
                 throws IOException

Copies all bytes from the given input stream to the given output stream. Caller is responsible for closing the streams.

Throws:

IOException - if there is any IO exception during read or write.

drainInputStream

public static void drainInputStream(InputStream in)

Read all remaining data in the stream.

Parameters:

in - InputStream to read.