JavaTM 2 Platform
Std. Ed. v1.4.2

javax.imageio.stream
Class FileImageOutputStream

java.lang.Object
  extended byjavax.imageio.stream.ImageInputStreamImpl
      extended byjavax.imageio.stream.ImageOutputStreamImpl
          extended byjavax.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 the total length of the stream, if known.
 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 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 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 is a directory or 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
Throws:
IOException

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException
Description copied from interface: ImageInputStream
Reads up to len bytes from the stream, and stores them into b starting at index off. The number of bytes read is returned. If no bytes can be read because the end of the stream has been 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
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 ImageOutputStream
Specified by:
write in class ImageOutputStreamImpl
Throws:
IOException

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 ImageOutputStream
Specified by:
write in class ImageOutputStreamImpl
Throws:
IOException

length

public long length()
Description copied from interface: ImageInputStream
Returns the total length of the stream, if known. Otherwise, -1 is returned.

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
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

JavaTM 2 Platform
Std. Ed. v1.4.2

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 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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