Package org.apache.accumulo.core.file.blockfile.impl

Class CachableBlockFile.BlockRead

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

java.io.DataInputStream

org.apache.accumulo.core.file.blockfile.impl.CachableBlockFile.BlockRead

All Implemented Interfaces:

Closeable, DataInput, AutoCloseable, ABlockReader

Direct Known Subclasses:

CachableBlockFile.CachedBlockRead

Enclosing class:

CachableBlockFile

public static class CachableBlockFile.BlockRead
extends DataInputStream
implements ABlockReader

Class provides functionality to read one block from the underlying BCFile Since We are caching blocks in the Reader class as bytearrays, this class will wrap a DataInputStream(ByteArrayStream(cachedBlock)).

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor	Description
BlockRead(InputStream in, long size)

Method Summary

Modifier and Type	Method	Description
byte[]	getBuffer()	The byte array returned by this method is only for read optimizations, it should not be modified.
<T> T	getIndex(Class<T> clazz)
int	getPosition()	Get the file position.
DataInputStream	getStream()	It is intended that the caller of this method will close the stream we also only intend that this be called once per BlockRead.
boolean	isIndexable()	An indexable block supports seeking, getting a position, and associating an arbitrary index with the block
void	seek(int position)

Methods inherited from class java.io.DataInputStream

read, read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, readUTF, skipBytes

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.accumulo.core.file.blockfile.ABlockReader

close

Methods inherited from interface java.io.DataInput

readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, skipBytes

Constructor Detail

BlockRead

public BlockRead(InputStream in,
                 long size)

Method Detail

getStream

public DataInputStream getStream()
                          throws IOException

It is intended that the caller of this method will close the stream we also only intend that this be called once per BlockRead. This method is provide for methods up stream that expect to receive a DataInputStream object.

Specified by:

getStream in interface ABlockReader

Throws:

IOException

isIndexable

public boolean isIndexable()

Description copied from interface: ABlockReader

An indexable block supports seeking, getting a position, and associating an arbitrary index with the block

Specified by:

isIndexable in interface ABlockReader

Returns:

true, if the block is indexable; otherwise false.

seek

public void seek(int position)

Specified by:

seek in interface ABlockReader

getPosition

public int getPosition()

Description copied from interface: ABlockReader

Get the file position.

Specified by:

getPosition in interface ABlockReader

Returns:

the file position.

getIndex

public <T> T getIndex(Class<T> clazz)

Specified by:

getIndex in interface ABlockReader

getBuffer

public byte[] getBuffer()

The byte array returned by this method is only for read optimizations, it should not be modified.

Specified by:

getBuffer in interface ABlockReader