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javax.imageio.stream
Class FileImageOutputStream
java.lang.Object
javax.imageio.stream.ImageInputStreamImpl
javax.imageio.stream.ImageOutputStreamImpl
javax.imageio.stream.FileImageOutputStream
-
All Implemented Interfaces:
-
DataInput
,
DataOutput
,
ImageInputStream
,
ImageOutputStream
-
public class FileImageOutputStream
- extends ImageOutputStreamImpl
An implementation of ImageOutputStream that writes its output directly to a File or RandomAccessFile.
Method Summary
|
void |
close
()
Closes the stream. |
protected void
|
finalize
()
Finalizes this object prior to garbage collection.
|
long |
length
()
Returns -1L to indicate that the stream has unknown length. |
int |
read
()
Reads a single byte from the stream and returns it as an
int
integer
between 0 and 255. |
int |
read
(byte[] b, int off, int len)
Reads up to len bytes from the stream, and stores them into b starting at index off. |
void |
seek
(long pos)
Sets the current stream position and resets the bit offset to 0. |
void |
write
(byte[] b, int off, int len)
Writes a sequence of bytes to the stream at the current position. |
void |
write
(int b)
Writes a single byte to the stream at the current position. |
Methods inherited from class javax.imageio.stream.
ImageOutputStreamImpl
|
flushBits
,
write
,
writeBit
,
writeBits
,
writeBoolean
,
writeByte
,
writeBytes
,
writeChar
,
writeChars
,
writeChars
,
writeDouble
,
writeDoubles
,
writeFloat
,
writeFloats
,
writeInt
,
writeInts
,
writeLong
,
writeLongs
,
writeShort
,
writeShorts
,
writeUTF
|
Methods inherited from class javax.imageio.stream.
ImageInputStreamImpl
|
checkClosed
,
finalize
,
flush
,
flushBefore
,
getBitOffset
,
getByteOrder
,
getFlushedPosition
,
getStreamPosition
,
isCached
,
isCachedFile
,
isCachedMemory
,
mark
,
read
,
readBit
,
readBits
,
readBoolean
,
readByte
,
readBytes
,
readChar
,
readDouble
,
readFloat
,
readFully
,
readFully
,
readFully
,
readFully
,
readFully
,
readFully
,
readFully
,
readFully
,
readInt
,
readLine
,
readLong
,
readShort
,
readUnsignedByte
,
readUnsignedInt
,
readUnsignedShort
,
readUTF
,
reset
,
setBitOffset
,
setByteOrder
,
skipBytes
,
skipBytes
|
Methods inherited from interface javax.imageio.stream.
ImageInputStream
|
flush
,
getBitOffset
,
getByteOrder
,
getFlushedPosition
,
getStreamPosition
,
isCached
,
isCachedFile
,
isCachedMemory
,
mark
,
read
,
readBit
,
readBits
,
readBoolean
,
readByte
,
readBytes
,
readChar
,
readDouble
,
readFloat
,
readFully
,
readFully
,
readFully
,
readFully
,
readFully
,
readFully
,
readFully
,
readFully
,
readInt
,
readLine
,
readLong
,
readShort
,
readUnsignedByte
,
readUnsignedInt
,
readUnsignedShort
,
readUTF
,
reset
,
setBitOffset
,
setByteOrder
,
skipBytes
,
skipBytes
|
FileImageOutputStream
public FileImageOutputStream(File f)
throws FileNotFoundException,
IOException
-
Constructs a FileImageOutputStream that will write to a given File.
-
Parameters:
-
f - a File to write to.
-
Throws:
-
IllegalArgumentException
- if f is null.
-
SecurityException
- if a security manager exists and does not allow write access to the file.
-
FileNotFoundException
- if f does not denote a regular file or it cannot be opened for reading and writing for any other reason.
-
IOException
- if an I/O error occurs.
FileImageOutputStream
public FileImageOutputStream(RandomAccessFile raf)
-
Constructs a FileImageOutputStream that will write to a given RandomAccessFile.
-
Parameters:
-
raf - a RandomAccessFile to write to.
-
Throws:
-
IllegalArgumentException
- if raf is null.
read
public int read()
throws IOException
-
Description copied from
class:
ImageInputStreamImpl
interface:
ImageInputStream
-
Reads a single byte from the stream and returns it as an
int
integer
between 0 and 255. If
EOF
the end of the stream
is reached, -1 is returned.
Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.
The bit offset within the stream is reset to zero before the read occurs.
The bit offset within the stream must be reset to zero before the read occurs.
-
-
Specified by:
-
read
in interface
ImageInputStream
-
Specified by:
-
read
in class
ImageInputStreamImpl
-
-
Returns:
-
the value of the next byte in the stream, or -1 if EOF is reached.
a byte value from the stream, as an int, or -1 to indicate EOF.
-
Throws:
-
IOException
- if the stream has been closed.
- if an I/O error occurs.
read
public int read(byte[] b,
int off,
int len)
throws IOException
-
Description copied from class:
ImageInputStreamImpl
-
Reads up to len bytes from the stream, and stores them into b starting at index off. If no bytes can be read because the end of the stream has been reached, -1 is returned.
The bit offset within the stream must be reset to zero before the read occurs.
Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.
-
-
Specified by:
-
read
in interface
ImageInputStream
-
Specified by:
-
read
in class
ImageInputStreamImpl
-
-
Parameters:
-
b - an array of bytes to be written to.
-
off - the starting position within b to write to.
-
len - the maximum number of bytes to read.
-
Returns:
-
the number of bytes actually read, or -1 to indicate EOF.
-
Throws:
-
IOException
- if an I/O error occurs.
write
public void write(int b)
throws IOException
-
Description copied from interface:
ImageOutputStream
-
Writes a single byte to the stream at the current position. The 24 high-order bits of b are ignored.
If the bit offset within the stream is non-zero, the remainder of the current byte is padded with 0s and written out first. The bit offset will be 0 after the write. Implementers can use the
flushBits
method of
ImageOutputStreamImpl
to guarantee this.
-
-
Specified by:
-
write
in interface
DataOutput
-
Specified by:
-
write
in interface
ImageOutputStream
-
Specified by:
-
write
in class
ImageOutputStreamImpl
-
-
Parameters:
-
b - an int whose lower 8 bits are to be written.
-
Throws:
-
IOException
- if an I/O error occurs.
write
public void write(byte[] b,
int off,
int len)
throws IOException
-
Description copied from interface:
ImageOutputStream
-
Writes a sequence of bytes to the stream at the current position. If len is 0, nothing is written. The byte b[off] is written first, then the byte b[off + 1], and so on.
If the bit offset within the stream is non-zero, the remainder of the current byte is padded with 0s and written out first. The bit offset will be 0 after the write. Implementers can use the
flushBits
method of
ImageOutputStreamImpl
to guarantee this.
-
-
Specified by:
-
write
in interface
DataOutput
-
Specified by:
-
write
in interface
ImageOutputStream
-
Specified by:
-
write
in class
ImageOutputStreamImpl
-
-
Parameters:
-
b - an array of bytes to be written.
-
off - the start offset in the data.
-
len - the number of bytes to write.
-
Throws:
-
IOException
- if an I/O error occurs.
length
public long length()
-
Description copied from class:
ImageInputStreamImpl
-
Returns -1L to indicate that the stream has unknown length. Subclasses must override this method to provide actual length information.
-
-
Specified by:
-
length
in interface
ImageInputStream
-
Overrides:
-
length
in class
ImageInputStreamImpl
-
-
Returns:
-
-1L to indicate unknown length.
seek
public void seek(long pos)
throws IOException
-
Sets the current stream position and resets the bit offset to 0. It is legal to seeking past the end of the file; an EOFException will be thrown only if a read is performed. The file length will not be increased until a write is performed.
-
-
Specified by:
-
seek
in interface
ImageInputStream
-
Overrides:
-
seek
in class
ImageInputStreamImpl
-
-
Parameters:
-
pos - a long containing the desired file pointer position.
-
Throws:
-
IndexOutOfBoundsException
- if pos is smaller than the flushed position.
-
IOException
- if any other I/O error occurs.
close
public void close()
throws IOException
-
Description copied from interface:
ImageInputStream
-
Closes the stream. Attempts to access a stream that has been closed may result in IOExceptions or incorrect behavior. Calling this method may allow classes implementing this interface to release resources associated with the stream such as memory, disk space, or file descriptors.
-
-
Specified by:
-
close
in interface
ImageInputStream
-
Overrides:
-
close
in class
ImageInputStreamImpl
-
-
Throws:
-
IOException
- if an I/O error occurs.
finalize
protected void
finalize
()
throws
Throwable
-
Finalizes this object prior to garbage collection. The close method is called to close any open input source. This method should not be called from application code.
-
-
Overrides:
-
finalize
in class
ImageInputStreamImpl
-
-
Throws:
-
Throwable
- if an error occurs during superclass finalization.