Package org.apache.jackrabbit.core.data.db

Class DbInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

org.apache.commons.io.input.ProxyInputStream

org.apache.commons.io.input.AutoCloseInputStream

org.apache.jackrabbit.core.data.db.DbInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class DbInputStream
extends AutoCloseInputStream

This class represents an input stream backed by a database. The database objects are only acquired when reading from the stream, and stay open until the stream is closed, fully read, or garbage collected.

This class does not support mark/reset. It is always to be wrapped using a BufferedInputStream.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.commons.io.input.AutoCloseInputStream

AutoCloseInputStream.Builder

Method Summary

Modifier and Type	Method	Description
int	available()	Invokes the delegate's InputStream.available() method.
void	close()	Closes the underlying input stream and replaces the reference to it with a ClosedInputStream instance.
void	mark(int readlimit)	This method does nothing.
boolean	markSupported()	Check whether mark and reset are supported.
int	read()	Invokes the delegate's InputStream.read() method unless the stream is closed.
int	read(byte[] b)	Invokes the delegate's InputStream.read(byte[]) method.
int	read(byte[] b, int off, int len)	Invokes the delegate's InputStream.read(byte[], int, int) method.
void	reset()	This method does nothing.
long	skip(long n)	Invokes the delegate's InputStream.skip(long) method.

Methods inherited from class org.apache.commons.io.input.AutoCloseInputStream

builder

Methods inherited from class org.apache.commons.io.input.ProxyInputStream

setReference, unwrap

Methods inherited from class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

Methods inherited from class java.lang.Object

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

Method Details

read

public int read()
         throws IOException

Invokes the delegate's InputStream.read() method unless the stream is closed. When the stream is consumed, the database objects held by the instance are closed.

Overrides:

read in class ProxyInputStream

Returns:

the byte read or EOF if we reached the end of stream.

Throws:

IOException - if an I/O error occurs.

read

public int read(byte[] b)
         throws IOException

Invokes the delegate's InputStream.read(byte[]) method. When the stream is consumed, the database objects held by the instance are closed.

Overrides:

read in class ProxyInputStream

Parameters:

b - the buffer to read the bytes into.

Returns:

the number of bytes read or EOF if we reached the end of stream.

Throws:

IOException -

• If the first byte cannot be read for any reason other than the end of the file,
• if the input stream has been closed, or
• if some other I/O error occurs.

read

public int read(byte[] b,
 int off,
 int len)
         throws IOException

Invokes the delegate's InputStream.read(byte[], int, int) method. When the stream is consumed, the database objects held by the instance are closed.

Overrides:

read in class ProxyInputStream

Parameters:

b - the buffer to read the bytes into.

off - The start offset.

len - The number of bytes to read.

Returns:

the number of bytes read or EOF if we reached the end of stream.

Throws:

IOException -

• If the first byte cannot be read for any reason other than the end of the file,
• if the input stream has been closed, or
• if some other I/O error occurs.

close

public void close()
           throws IOException

Closes the underlying input stream and replaces the reference to it with a ClosedInputStream instance.

This method is automatically called by the read methods when the end of input has been reached.

Note that it is safe to call this method any number of times. The original underlying input stream is closed and discarded only once when this method is first called.

When the stream is consumed, the database objects held by the instance are closed.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class AutoCloseInputStream

Throws:

IOException - if the underlying input stream cannot be closed

skip

public long skip(long n)
          throws IOException

Invokes the delegate's InputStream.skip(long) method.

Overrides:

skip in class ProxyInputStream

Parameters:

n - the number of bytes to skip.

Returns:

the actual number of bytes skipped.

Throws:

IOException - if the stream does not support seek, or if some other I/O error occurs.

available

public int available()
              throws IOException

Invokes the delegate's InputStream.available() method.

Overrides:

available in class ProxyInputStream

Returns:

the number of available bytes, 0 if the stream is closed.

Throws:

IOException - if an I/O error occurs.

mark

public void mark(int readlimit)

This method does nothing.

Overrides:

mark in class ProxyInputStream

Parameters:

readlimit - read ahead limit.

reset

public void reset()
           throws IOException

This method does nothing.

Overrides:

reset in class ProxyInputStream

Throws:

IOException - if this stream has not been marked or if the mark has been invalidated.

markSupported

public boolean markSupported()

Check whether mark and reset are supported.

Overrides:

markSupported in class ProxyInputStream

Returns:

false

See Also:

• ProxyInputStream.mark(int)
• ProxyInputStream.reset()