JavaTM 2 Platform
Standard Ed. 5.0

javax.imageio.stream
Class FileImageOutputStream

java.lang.Object
  extended by javax.imageio.stream.ImageInputStreamImpl
      extended by javax.imageio.stream.ImageOutputStreamImpl
          extended by 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.

JavaTM 2 Platform
Standard Ed. 5.0

Submit a bug or feature
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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