Class FileImageOutputStream

java.lang.Object
javax.imageio.stream.ImageInputStreamImpl
javax.imageio.stream.ImageOutputStreamImpl
javax.imageio.stream.FileImageOutputStream
All Implemented Interfaces:
Closeable, DataInput, DataOutput, AutoCloseable, ImageInputStream, ImageOutputStream 
public class FileImageOutputStream extends ImageOutputStreamImpl
An implementation of ImageOutputStream that writes its output directly to a File or RandomAccessFile.

Field Summary

Fields declared in class javax.imageio.stream.ImageInputStreamImpl

bitOffset, byteOrder, flushedPos, streamPos

Constructor Summary

Constructor Description
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

Modifier and Type Method Description
void close()
Closes the stream.
protected void finalize()
Deprecated.
The finalize method has been deprecated.
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 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 declared in 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 declared in class javax.imageio.stream.ImageInputStreamImpl

checkClosed, close, flush, flushBefore, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, isCached, isCachedFile, isCachedMemory, length, 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 declared in class java.lang.Object

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

Methods declared in 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

Methods declared in interface javax.imageio.stream.ImageOutputStream

flushBefore

Constructor Details

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 Details

read

public int read() throws IOException
Description copied from class: ImageInputStreamImpl
Reads a single byte from the stream and returns it as an int between 0 and 255. If EOF 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 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.
Throws:
IOException - if the stream has been closed.

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.

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.

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.
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.
Throws:
IOException - if an I/O error occurs.

finalize

@Deprecated(since="9") protected void finalize() throws Throwable
Deprecated.
The finalize method has been deprecated. Subclasses that override finalize in order to perform cleanup should be modified to use alternative cleanup mechanisms and to remove the overriding finalize method. When overriding the finalize method, its implementation must explicitly ensure that super.finalize() is invoked as described in Object.finalize(). See the specification for Object.finalize() for further information about migration options.
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.
See Also:

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https://docs.oracle.com/en/java/javase/17/docs/api/java.desktop/javax/imageio/stream/FileImageOutputStream.html