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

public class DbInputStream
extends org.apache.commons.io.input.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.

Field Summary

protected boolean	endOfStream
protected DataIdentifier	identifier
protected ResultSet	rs
protected DbDataStore	store

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

protected

DbInputStream(DbDataStore store, DataIdentifier identifier) Create a database input stream for the given identifier.

Method Summary

int	available()
void	close() When the stream is consumed, the database objects held by the instance are closed.
void	mark(int readlimit) This method does nothing.
boolean	markSupported() Check whether mark and reset are supported.
protected void	openStream() Open the stream if required.
int	read() When the stream is consumed, the database objects held by the instance are closed.
int	read(byte[] b) When the stream is consumed, the database objects held by the instance are closed.
int	read(byte[] b, int off, int len) When the stream is consumed, the database objects held by the instance are closed.
void	reset() This method does nothing.
long	skip(long n)

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

afterRead, finalize

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

beforeRead, handleIOException

Methods inherited from class java.lang.Object

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

Field Detail

store

protected DbDataStore store

identifier

protected DataIdentifier identifier

endOfStream

protected boolean endOfStream

rs

protected ResultSet rs

Constructor Detail

DbInputStream

protected DbInputStream(DbDataStore store,
                        DataIdentifier identifier)

Create a database input stream for the given identifier. Database access is delayed until the first byte is read from the stream.

Parameters:

store - the database data store

identifier - the data identifier

Method Detail

openStream

protected void openStream()
                   throws IOException

Open the stream if required.

Throws:

IOException

read

public int read()
         throws IOException

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

Overrides:

read in class org.apache.commons.io.input.ProxyInputStream

Throws:

IOException

read

public int read(byte[] b)
         throws IOException

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

Overrides:

read in class org.apache.commons.io.input.ProxyInputStream

Throws:

IOException

read

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

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

Overrides:

read in class org.apache.commons.io.input.ProxyInputStream

Throws:

IOException

close

public void close()
           throws IOException

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

Specified by:

close in interface Closeable

Overrides:

close in class org.apache.commons.io.input.AutoCloseInputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class org.apache.commons.io.input.ProxyInputStream

Throws:

IOException

available

public int available()
              throws IOException

Overrides:

available in class org.apache.commons.io.input.ProxyInputStream

Throws:

IOException

mark

public void mark(int readlimit)

This method does nothing.

Overrides:

mark in class org.apache.commons.io.input.ProxyInputStream

reset

public void reset()
           throws IOException

This method does nothing.

Overrides:

reset in class org.apache.commons.io.input.ProxyInputStream

Throws:

IOException

markSupported

public boolean markSupported()

Check whether mark and reset are supported.

Overrides:

markSupported in class org.apache.commons.io.input.ProxyInputStream

Returns:

false