com.qcloud.cos.internal

类 ResettableInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

com.qcloud.cos.internal.SdkFilterInputStream

com.qcloud.cos.internal.ReleasableInputStream

com.qcloud.cos.internal.ResettableInputStream

所有已实现的接口:

Releasable, Closeable, AutoCloseable

public class ResettableInputStream
extends ReleasableInputStream

A mark-and-resettable input stream that can be used on files or file input streams. In particular, a ResettableInputStream allows the close operation to be disabled via ReleasableInputStream.disableClose() (to avoid accidentally being closed). This is necessary when such input stream needs to be marked-and-reset multiple times but only as long as the stream has not been closed.

The creator of this input stream should therefore always call ReleasableInputStream.release() in a finally block to truly release the underlying resources.

另请参阅:

Releasable

字段概要

从类继承的字段 java.io.FilterInputStream

in

构造器概要

构造器

构造器和说明
ResettableInputStream(File file)
ResettableInputStream(FileInputStream fis)

方法概要

方法

限定符和类型	方法和说明
int	available()
File	getFile() Returns the underlying file, if known; or null if not;
void	mark(int _) Marks the current position in this input stream.
boolean	markSupported()
static ResettableInputStream	newResettableInputStream(File file) Convenient factory method to construct a new resettable input stream for the given file, converting any IOException into CosClientException.
static ResettableInputStream	newResettableInputStream(FileInputStream fis) Convenient factory method to construct a new resettable input stream for the given file input stream, converting any IOException into CosClientException.
static ResettableInputStream	newResettableInputStream(FileInputStream fis, String errmsg) Convenient factory method to construct a new resettable input stream for the given file input stream, converting any IOException into CosClientException with the given error message.
static ResettableInputStream	newResettableInputStream(File file, String errmsg) Convenient factory method to construct a new resettable input stream for the given file, converting any IOException into CosClientException with the given error message.
int	read()
int	read(byte[] arg0, int arg1, int arg2)
void	reset() Repositions this stream to the position at the time the mark method was last called on this input stream.
long	skip(long n)

从类继承的方法 com.qcloud.cos.internal.ReleasableInputStream

close, disableClose, isCloseDisabled, release, wrap

从类继承的方法 com.qcloud.cos.internal.SdkFilterInputStream

abort, abortIfNeeded

从类继承的方法 java.io.FilterInputStream

read

从类继承的方法 java.lang.Object

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

构造器详细资料

ResettableInputStream

public ResettableInputStream(File file)
                      throws IOException

参数:

file - must not be null. Upon successful construction the the file will be opened with an input stream automatically marked at the starting position of the given file.

Note 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 ReleasableInputStream.disableClose(), so that the release method becomes the only way to truly close the opened file.

抛出:

IOException

ResettableInputStream

public ResettableInputStream(FileInputStream fis)
                      throws IOException

参数:

fis - file input stream; must not be null. Upon successful construction the input stream will be automatically marked at the current position of the given file input stream.

Note 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 ReleasableInputStream.disableClose(), so that the release method becomes the only way to truly close the opened file.

抛出:

IOException

方法详细资料

markSupported

public final boolean markSupported()

覆盖:

markSupported 在类中 SdkFilterInputStream

mark

public void mark(int _)

Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes. This method works as long as the underlying file has not been closed.

Note 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 ReleasableInputStream.disableClose(), so that the release method becomes the only way to truly close the opened file.

覆盖:

mark 在类中 SdkFilterInputStream

参数:

_ - ignored

reset

public void reset()
           throws IOException

Repositions this stream to the position at the time the mark method was last called on this input stream. This method works as long as the underlying file has not been closed.

Note 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 ReleasableInputStream.disableClose(), so that the release method becomes the only way to truly close the opened file.

覆盖:

reset 在类中 SdkFilterInputStream

抛出:

IOException

available

public int available()
              throws IOException

覆盖:

available 在类中 SdkFilterInputStream

抛出:

IOException

read

public int read()
         throws IOException

覆盖:

read 在类中 SdkFilterInputStream

抛出:

IOException

skip

public long skip(long n)
          throws IOException

覆盖:

skip 在类中 SdkFilterInputStream

抛出:

IOException

read

public int read(byte[] arg0,
       int arg1,
       int arg2)
         throws IOException

覆盖:

read 在类中 SdkFilterInputStream

抛出:

IOException

getFile

public File getFile()

Returns the underlying file, if known; or null if not;

newResettableInputStream

public static ResettableInputStream newResettableInputStream(File file)

Convenient factory method to construct a new resettable input stream for the given file, converting any IOException into CosClientException.

Note 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 ReleasableInputStream.disableClose(), so that the release method becomes the only way to truly close the opened file.

newResettableInputStream

public static ResettableInputStream newResettableInputStream(File file,
                                             String errmsg)

Convenient factory method to construct a new resettable input stream for the given file, converting any IOException into CosClientException with the given error message.

Note 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 ReleasableInputStream.disableClose(), so that the release method becomes the only way to truly close the opened file.

newResettableInputStream

public static ResettableInputStream newResettableInputStream(FileInputStream fis)

Convenient factory method to construct a new resettable input stream for the given file input stream, converting any IOException into CosClientException.

Note 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 ReleasableInputStream.disableClose(), so that the release method becomes the only way to truly close the opened file.

newResettableInputStream

public static ResettableInputStream newResettableInputStream(FileInputStream fis,
                                             String errmsg)

Convenient factory method to construct a new resettable input stream for the given file input stream, converting any IOException into CosClientException with the given error message.

Note 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 ReleasableInputStream.disableClose(), so that the release method becomes the only way to truly close the opened file.