com.singlestore.jdbc

Class BlobImpl

java.lang.Object

com.singlestore.jdbc.BlobImpl

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

SingleStoreBlob, SingleStoreClob

public class BlobImpl
extends Object
implements Serializable

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	data
protected int	length
protected int	offset

Constructor Summary

Constructors

Constructor and Description
BlobImpl() Creates an empty blob.
BlobImpl(byte[] bytes) Creates a blob with content.
BlobImpl(byte[] bytes, int offset, int length) Creates a blob with content.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
void	free() This method frees the Blob object and releases the resources that it holds.
InputStream	getBinaryStream() Retrieves the BLOB value designated by this Blob instance as a stream.
InputStream	getBinaryStream(long pos, long length) Returns an InputStream object that contains a partial Blob value, starting with the byte specified by pos, which is length bytes in length.
byte[]	getBytes(long pos, int length) Retrieves all or part of the BLOB value that this Blob object represents, as an array of bytes.
int	hashCode()
long	length() Returns the number of bytes in the BLOB value designated by this Blob object.
long	position(Blob pattern, long start) Retrieves the byte position in the BLOB value designated by this Blob object at which pattern begins.
long	position(byte[] pattern, long start) Retrieves the byte position at which the specified byte array pattern begins within the BLOB value that this Blob object represents.
static BlobImpl	safeSingleStoreBlob(byte[] bytes, int offset, int length)
OutputStream	setBinaryStream(long pos) Retrieves a stream that can be used to write to the BLOB value that this Blob object represents.
int	setBytes(long pos, byte[] bytes) Writes the given array of bytes to the BLOB value that this Blob object represents, starting at position pos, and returns the number of bytes written.
int	setBytes(long pos, byte[] bytes, int offset, int len) Writes all or part of the given byte array to the BLOB value that this Blob object represents and returns the number of bytes written.
void	truncate(long len) Truncates the BLOB value that this Blob object represents to be len bytes in length.

Methods inherited from class java.lang.Object

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

Field Detail

data

protected byte[] data

offset

protected transient int offset

length

protected transient int length

Constructor Detail

BlobImpl

public BlobImpl()

Creates an empty blob.

BlobImpl

public BlobImpl(byte[] bytes)

Creates a blob with content.

Parameters:

bytes - the content for the blob.

BlobImpl

public BlobImpl(byte[] bytes,
                int offset,
                int length)

Creates a blob with content.

Parameters:

bytes - the content for the blob.

offset - offset

length - length

Method Detail

safeSingleStoreBlob

public static BlobImpl safeSingleStoreBlob(byte[] bytes,
                                           int offset,
                                           int length)

length

public long length()

Returns the number of bytes in the BLOB value designated by this Blob object.

Returns:

length of the BLOB in bytes

getBytes

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

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

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; the value for length must be 0 or greater

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 value; if pos is less than 1 or length is less than 0

Since:

1.2

See Also:

setBytes(long, byte[])

getBinaryStream

public InputStream getBinaryStream()
                            throws SQLException

Retrieves the BLOB value designated by this Blob instance as a stream.

Returns:

a stream containing the BLOB data

Throws:

SQLException - if something went wrong

See Also:

setBinaryStream(long)

getBinaryStream

public InputStream getBinaryStream(long pos,
                                   long length)
                            throws SQLException

Returns an InputStream object that contains a partial Blob value, starting with the byte specified by pos, which is length bytes in length.

Parameters:

pos - the offset to the first byte of the partial value to be retrieved. The first byte in the Blob is at position 1

length - the length in bytes of the partial value to be retrieved

Returns:

InputStream through which the partial Blob value can be read.

Throws:

SQLException - if pos is less than 1 or if pos is greater than the number of bytes in the Blob or if pos + length is greater than the number of bytes in the Blob

position

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

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

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

position

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

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

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

setBytes

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

Writes the given array of bytes to the BLOB value that this Blob object represents, starting at position pos, and returns the number of bytes written. The array of bytes will overwrite the existing bytes in the Blob object starting at the position pos. If the end of the Blob value is reached while writing the array of bytes, then the length of the Blob value will be increased to accommodate the extra bytes.

Parameters:

pos - the position in the BLOB object at which to start writing; the first position is 1

bytes - the array of bytes to be written to the BLOB value that this Blob object represents

Returns:

the number of bytes written

Throws:

SQLException

See Also:

getBytes(long, int)

setBytes

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

Writes all or part of the given byte array to the BLOB value that this Blob object represents and returns the number of bytes written. Writing starts at position pos in the BLOB value; len bytes from the given byte array are written. The array of bytes will overwrite the existing bytes in the Blob object starting at the position pos. If the end of the Blob value is reached while writing the array of bytes, then the length of the Blob value will be increased to accommodate the extra bytes.

Note: If the value specified for pos is greater then the length+1 of the BLOB value then the behavior is undefined. Some JDBC drivers may throw a SQLException while other drivers may support this operation.

Parameters:

pos - the position in the BLOB object at which to start writing; the first position is 1

bytes - the array of bytes to be written to this BLOB object

offset - the offset into the array bytes at which to start reading the bytes to be set

len - the number of bytes to be written to the BLOB value from the array of bytes bytes

Returns:

the number of bytes written

Throws:

SQLException - if there is an error accessing the BLOB value or if pos is less than 1

See Also:

getBytes(long, int)

setBinaryStream

public OutputStream setBinaryStream(long pos)
                             throws SQLException

Retrieves a stream that can be used to write to the BLOB value that this Blob object represents. The stream begins at position pos. The bytes written to the stream will overwrite the existing bytes in the Blob object starting at the position pos. If the end of the Blob value is reached while writing to the stream, then the length of the Blob value will be increased to accommodate the extra bytes.

Note: If the value specified for pos is greater then the length+1 of the BLOB value then the behavior is undefined. Some JDBC drivers may throw a SQLException while other drivers may support this operation.

Parameters:

pos - the position in the BLOB value at which to start writing; the first position is 1

Returns:

a java.io.OutputStream object to which data can be written

Throws:

SQLException - if there is an error accessing the BLOB value or if pos is less than 1

Since:

1.4

See Also:

getBinaryStream()

truncate

public void truncate(long len)

Truncates the BLOB value that this Blob object represents to be len bytes in length.

Parameters:

len - the length, in bytes, to which the BLOB value that this Blob object represents should be truncated

free

public void free()

This method frees the Blob object and releases the resources that it holds. The object is invalid once the free method is called.

After free has been called, any attempt to invoke a method other than free will result in a SQLException being thrown. If free is called multiple times, the subsequent calls to free are treated as a no-op.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object