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.

Field Summary

Fields inherited from class javax.imageio.stream.ImageInputStreamImpl

bitOffset, byteOrder, flushedPos, streamPos

Constructor Summary

FileImageOutputStream(File f)
Constructs a FileImageOutputStream that will write to a given File.

FileImageOutputStream(RandomAccessFile raf)
Constructs a FileImageOutputStream that will write to a given RandomAccessFile.

Method Summary

void	close() Closes the stream.
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 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 len bytes from array b, in order, to the output stream.
void	write(int b) Writes to the output stream the eight low-order bits of the argument b.

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 class java.lang.Object

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

Methods inherited from interface javax.imageio.stream.ImageOutputStream

flushBefore

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

Constructor Detail

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.

Method Detail

read

public int read()
         throws IOException

Description copied from interface: ImageInputStream

Reads a single byte from the stream and returns it as an integer between 0 and 255. If the end of the stream is reached, -1 is returned.

The bit offset within the stream is reset to zero before the read occurs.

Specified by:

read in interface ImageInputStream

Specified by:

read in class ImageInputStreamImpl

Returns:

a byte value from the stream, as an int, or -1 to indicate EOF.

Throws:

IOException - 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: DataOutput

Writes to the output stream the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

Specified by:

write in interface DataOutput

Specified by:

write in interface ImageOutputStream

Specified by:

write in class ImageOutputStreamImpl

Parameters:

b - the byte 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: DataOutput

Writes len bytes from array b, in order, to the output stream. If b is null, a NullPointerException is thrown. If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown. If len is zero, then no bytes are written. Otherwise, the byte b[off] is written first, then b[off+1], and so on; the last byte written is b[off+len-1].

Specified by:

write in interface DataOutput

Specified by:

write in interface ImageOutputStream

Specified by:

write in class ImageOutputStreamImpl

Parameters:

b - the data.

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.