Package org.firebirdsql.jdbc
Interface FirebirdBlob.BlobInputStream
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- All Known Implementing Classes:
FBBlobInputStream
- Enclosing interface:
- FirebirdBlob
public static interface FirebirdBlob.BlobInputStreamBlob input stream. This interface defines methods to access contents of the Blob field. Some method signatures are copied from theInputStreamonly because it is abstract class and not interface that we can extend.
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Field Summary
Fields Modifier and Type Field Description static intSEEK_MODE_ABSOLUTESeek based on the absolute beginning of the streamstatic intSEEK_MODE_FROM_TAILSeek relative to the tail end of the streamstatic intSEEK_MODE_RELATIVESeek relative to the current position in the stream
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description intavailable()Get number of available bytes that can be read without blocking.voidclose()Close this stream.FirebirdBlobgetBlob()Get instance ofFirebirdBlobto which this stream belongs to.longlength()Get Blob length.intread()Read single byte from the stream.intread(byte[] buffer, int offset, int length)Read some bytes from the stream without blocking.voidreadFully(byte[] buffer)Readbuffer.lengthbytes from the buffer.voidreadFully(byte[] buffer, int offset, int length)Readlengthfrom the stream into the specified buffer.voidseek(int position)Move current position in the Blob stream.voidseek(int position, int seekMode)Move current position in the Blob stream.
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Field Detail
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SEEK_MODE_ABSOLUTE
static final int SEEK_MODE_ABSOLUTE
Seek based on the absolute beginning of the stream- See Also:
- Constant Field Values
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SEEK_MODE_RELATIVE
static final int SEEK_MODE_RELATIVE
Seek relative to the current position in the stream- See Also:
- Constant Field Values
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SEEK_MODE_FROM_TAIL
static final int SEEK_MODE_FROM_TAIL
Seek relative to the tail end of the stream- See Also:
- Constant Field Values
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Method Detail
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getBlob
FirebirdBlob getBlob()
Get instance ofFirebirdBlobto which this stream belongs to.Note, code
FirebirdBlob.BlobInputStream otherStream = (FirebirdBlob.BlobInputStream) inputStream.getBlob().getBinaryStream();will return new stream object.- Returns:
- instance of
FirebirdBlob.
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available
int available() throws java.io.IOExceptionGet number of available bytes that can be read without blocking. This method will return number of bytes of the last read blob segment in the blob buffer.- Returns:
- number of bytes available without blocking or -1 if end of stream is reached.
- Throws:
java.io.IOException- if I/O error occurred.
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close
void close() throws java.io.IOExceptionClose this stream.- Throws:
java.io.IOException- if I/O error occurs.
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length
long length() throws java.io.IOExceptionGet Blob length. This is shortcut method for theinputStream.getBlob().length()call, however is more resource friendly, because no new Blob handle is created.- Returns:
- length of the blob.
- Throws:
java.io.IOException- if I/O error occurs.
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read
int read() throws java.io.IOException
Read single byte from the stream.- Returns:
- next byte read from the stream or -1 if end of stream was reached.
- Throws:
java.io.IOException- if I/O error occurs.
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read
int read(byte[] buffer, int offset, int length) throws java.io.IOExceptionRead some bytes from the stream without blocking.- Parameters:
buffer- buffer into which data should be read.offset- offset in the buffer where to start.length- number of bytes to read.- Returns:
- number of bytes that were read.
- Throws:
java.io.IOException- if I/O error occurs.
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readFully
void readFully(byte[] buffer, int offset, int length) throws java.io.IOExceptionReadlengthfrom the stream into the specified buffer. This method can block until desired number of bytes is read, it can throw an exception if end of stream was reached during read.- Parameters:
buffer- buffer where data should be read.offset- offset in the buffer where to start.length- number of bytes to read.- Throws:
java.io.EOFException- if stream end was reached when reading data.java.io.IOException- if I/O error occurs.
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readFully
void readFully(byte[] buffer) throws java.io.IOExceptionReadbuffer.lengthbytes from the buffer. This is a shortcut method forreadFully(buffer, 0, buffer.length)call.- Parameters:
buffer- buffer where data should be read.- Throws:
java.io.IOException- if I/O error occurs.
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seek
void seek(int position) throws java.io.IOException
Move current position in the Blob stream. This is a shortcut method toseek(int, int)passingSEEK_MODE_ABSOLUTEas seek mode.- Parameters:
position- absolute position to seek, starting position is 0 (note, inBlob.getBytes(long, int)starting position is 1).- Throws:
java.io.IOException- if I/O error occurs.
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seek
void seek(int position, int seekMode) throws java.io.IOExceptionMove current position in the Blob stream. Depending on the specified seek mode, position can be either positive or negative.Note, this method allows to move position in the Blob stream only forward. If you need to read data before the current position, new stream must be opened.
- Parameters:
position- position in the stream, starting position is 0 (note, inBlob.getBytes(long, int)starting position is 1).seekMode- mode of seek operation, one ofSEEK_MODE_ABSOLUTE,SEEK_MODE_RELATIVEorSEEK_MODE_FROM_TAIL.- Throws:
java.io.IOException- if I/O error occurs.
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