Package org.teiid.core.types

Class BlobImpl

java.lang.Object

org.teiid.core.types.BaseLob

org.teiid.core.types.BlobImpl

All Implemented Interfaces:

Externalizable, Serializable, Blob, InputStreamFactory.StreamFactoryReference, LobSearchUtil.StreamProvider

Direct Known Subclasses:

BinaryWSProcedureExecution.StreamingBlob

public class BlobImpl
extends BaseLob
implements Blob, LobSearchUtil.StreamProvider

This object holds a chunk of binary data and implements the JDBC Blob interface. It presents a streaming interface and provides a way to access partial of the blob data. Connectors can use this object when dealing with large objects.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
BlobImpl()
BlobImpl(InputStreamFactory streamFactory)	Creates a MMBlob object with the valueID.

Method Summary

Modifier and Type	Method	Description
InputStream	getBinaryStream(long arg0, long arg1)
byte[]	getBytes(long pos, int length)	Returns as an array of bytes, part or all of the BLOB value that this Blob object designates.
long	position(byte[] pattern, long start)	Determines the byte position at which the specified byte pattern begins within the BLOB value that this Blob object represents.
long	position(Blob pattern, long start)	Determines the byte position in the BLOB value designated by this Blob object at which pattern begins.
static long	quickLength(Blob b)	For a given blob try to determine the length without fully reading an inputstream
OutputStream	setBinaryStream(long pos)
int	setBytes(long pos, byte[] bytes)
int	setBytes(long pos, byte[] bytes, int offset, int len)
void	truncate(long len)

Methods inherited from class org.teiid.core.types.BaseLob

free, getBinaryStream, getCharacterStream, getCharset, getStreamFactory, length, readExternal, setCharset, setEncoding, setStreamFactory, writeExternal

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.sql.Blob

free, getBinaryStream, length

Methods inherited from interface org.teiid.core.types.LobSearchUtil.StreamProvider

getBinaryStream

Constructor Detail

BlobImpl

public BlobImpl()

BlobImpl

public BlobImpl(InputStreamFactory streamFactory)

Creates a MMBlob object with the valueID.

Parameters:

streamFactory - reference to value chunk in data source.

Method Detail

getBytes

public byte[] getBytes(long pos,
                       int length)
                throws SQLException

Returns as an array of bytes, part or all of the BLOB value that this Blob object designates. The byte array contains up to length consecutive bytes starting at position pos.

Specified by:

getBytes in interface Blob

Parameters:

pos - the ordinal position of the first byte in the BLOB value to be extracted; the first byte is at position 1

length - the number of consecutive bytes to be copied

Returns:

a byte array containing up to length consecutive bytes from the BLOB value designated by this Blob object, starting with the byte at position pos

Throws:

SQLException - if there is an error accessing the BLOB

position

public long position(Blob pattern,
                     long start)
              throws SQLException

Determines the byte position in the BLOB value designated by this Blob object at which pattern begins. The search begins at position start.

Specified by:

position in interface Blob

Parameters:

pattern - the Blob object designating the BLOB value for which to search

start - the position in the BLOB value at which to begin searching; the first position is 1

Returns:

the position at which the pattern begins, else -1

Throws:

SQLException - if there is an error accessing the BLOB

position

public long position(byte[] pattern,
                     long start)
              throws SQLException

Determines the byte position at which the specified byte pattern begins within the BLOB value that this Blob object represents. The search for pattern begins at position start.

Specified by:

position in interface Blob

Parameters:

pattern - the byte array for which to search

start - the position at which to begin searching; the first position is 1

Returns:

the position at which the pattern appears, else -1

Throws:

SQLException - if there is an error accessing the BLOB

getBinaryStream

public InputStream getBinaryStream(long arg0,
                                   long arg1)
                            throws SQLException

Specified by:

getBinaryStream in interface Blob

Throws:

SQLException

setBytes

public int setBytes(long pos,
                    byte[] bytes)
             throws SQLException

Specified by:

setBytes in interface Blob

Throws:

SQLException

See Also:

Blob.setBytes(long, byte[])

setBytes

public int setBytes(long pos,
                    byte[] bytes,
                    int offset,
                    int len)
             throws SQLException

Specified by:

setBytes in interface Blob

Throws:

SQLException

See Also:

Blob.setBytes(long, byte[], int, int)

setBinaryStream

public OutputStream setBinaryStream(long pos)
                             throws SQLException

Specified by:

setBinaryStream in interface Blob

Throws:

SQLException

See Also:

Blob.setBinaryStream(long)

truncate

public void truncate(long len)
              throws SQLException

Specified by:

truncate in interface Blob

Throws:

SQLException

See Also:

Blob.truncate(long)

quickLength

public static long quickLength(Blob b)

For a given blob try to determine the length without fully reading an inputstream

Returns:

the length or -1 if it cannot be determined