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Préférences
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JavaTM 2 Platform Std. Ed. v1.6.0
javax.imageio.stream
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Field Summary |
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Fields inherited from class javax.imageio.stream.ImageInputStreamImpl |
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bitOffset, byteOrder, flushedPos, streamPos |
Constructor Summary | |
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FileImageOutputStream(File f)
Constructs a FileImageOutputStream that will write
to a given File . |
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FileImageOutputStream(RandomAccessFile raf)
Constructs a FileImageOutputStream that will write
to a given RandomAccessFile . |
Method Summary | |
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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 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 |
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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 |
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checkClosed, 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 |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface javax.imageio.stream.ImageOutputStream |
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flushBefore |
Methods inherited from interface javax.imageio.stream.ImageInputStream |
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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 |
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public FileImageOutputStream(File f) throws FileNotFoundException, IOException
FileImageOutputStream
that will write
to a given File
.
f
- a File
to write to.
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.public FileImageOutputStream(RandomAccessFile raf)
FileImageOutputStream
that will write
to a given RandomAccessFile
.
raf
- a RandomAccessFile
to write to.
IllegalArgumentException
- if raf
is
null
.Method Detail |
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public int read() throws IOException
ImageInputStreamImpl
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.
read
in interface ImageInputStream
read
in class ImageInputStreamImpl
-1
if EOF is reached.
IOException
- if the stream has been closed.public int read(byte[] b, int off, int len) throws IOException
ImageInputStreamImpl
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.
read
in interface ImageInputStream
read
in class ImageInputStreamImpl
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.
-1
to indicate EOF.
IOException
- if an I/O error occurs.public void write(int b) throws IOException
ImageOutputStream
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
method of flushBits
to guarantee this.
ImageOutputStreamImpl
write
in interface DataOutput
write
in interface ImageOutputStream
write
in class ImageOutputStreamImpl
b
- an int
whose lower 8 bits are to be
written.
IOException
- if an I/O error occurs.public void write(byte[] b, int off, int len) throws IOException
ImageOutputStream
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
method of flushBits
to guarantee this.
ImageOutputStreamImpl
write
in interface DataOutput
write
in interface ImageOutputStream
write
in class ImageOutputStreamImpl
b
- an array of byte
s to be written.off
- the start offset in the data.len
- the number of byte
s to write.
IOException
- if an I/O error occurs.public long length()
ImageInputStreamImpl
-1L
to indicate that the stream has unknown
length. Subclasses must override this method to provide actual
length information.
length
in interface ImageInputStream
length
in class ImageInputStreamImpl
public void seek(long pos) throws IOException
EOFException
will be thrown only if a read is
performed. The file length will not be increased until a write
is performed.
seek
in interface ImageInputStream
seek
in class ImageInputStreamImpl
pos
- a long
containing the desired file
pointer position.
IndexOutOfBoundsException
- if pos
is smaller
than the flushed position.
IOException
- if any other I/O error occurs.public void close() throws IOException
ImageInputStream
IOException
s 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.
close
in interface ImageInputStream
close
in class ImageInputStreamImpl
IOException
- if an I/O error occurs.protected void finalize() throws Throwable
close
method is called to close any open input
source. This method should not be called from application
code.
finalize
in class ImageInputStreamImpl
Throwable
- if an error occurs during superclass
finalization.