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java.lang.Object | +--javax.imageio.stream.ImageInputStreamImpl | +--com.sun.media.imageio.stream.FileChannelImageInputStream
A class which implements ImageInputStream
using a
FileChannel
as the eventual data source. The channel
contents are assumed to be stable during the lifetime of the object.
Memory mapping and new I/O view Buffer
s are used to
read the data. Only methods which provide significant performance
improvement with respect to the superclass implementation are overridden.
Overridden methods are not commented individually unless some noteworthy
aspect of the implementation must be described.
The methods of this class are not synchronized.
ImageInputStream
,
java.nio,
FileChannel
Field Summary |
Fields inherited from class javax.imageio.stream.ImageInputStreamImpl |
bitOffset, byteOrder, flushedPos, streamPos |
Constructor Summary | |
FileChannelImageInputStream(FileChannel channel)
Constructs a FileChannelImageInputStream from a
FileChannel . |
Method Summary | |
void |
close()
Invokes the superclass method and sets the internal reference to the source FileChannel to null . |
long |
length()
Returns the number of bytes currently in the FileChannel . |
int |
read()
|
int |
read(byte[] b,
int off,
int len)
|
void |
readFully(char[] c,
int off,
int len)
|
void |
readFully(double[] d,
int off,
int len)
|
void |
readFully(float[] f,
int off,
int len)
|
void |
readFully(int[] i,
int off,
int len)
|
void |
readFully(long[] l,
int off,
int len)
|
void |
readFully(short[] s,
int off,
int len)
|
void |
seek(long pos)
Invokes the superclass method and sets the position within the memory mapped buffer. |
void |
setByteOrder(ByteOrder networkByteOrder)
|
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, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF, reset, setBitOffset, skipBytes, skipBytes |
Methods inherited from class java.lang.Object |
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public FileChannelImageInputStream(FileChannel channel) throws IOException
FileChannelImageInputStream
from a
FileChannel
. The initial position of the stream
stream is taken to be the position of the FileChannel
parameter when this constructor is invoked. The stream and flushed
positions are therefore both initialized to
channel.position()
.
channel
- the source FileChannel
.
IllegalArgumentException
- if channel
is
null
or is not open.
IOException
- if a method invoked on channel
throws an IOException
.Method Detail |
public int read() throws IOException
read
in interface ImageInputStream
read
in class ImageInputStreamImpl
IOException
public int read(byte[] b, int off, int len) throws IOException
read
in interface ImageInputStream
read
in class ImageInputStreamImpl
IOException
public void close() throws IOException
FileChannel
to null
.
The source FileChannel
is not closed.
close
in interface ImageInputStream
close
in class ImageInputStreamImpl
IOException
- if an error occurs.public void readFully(char[] c, int off, int len) throws IOException
readFully
in interface ImageInputStream
readFully
in class ImageInputStreamImpl
IOException
public void readFully(short[] s, int off, int len) throws IOException
readFully
in interface ImageInputStream
readFully
in class ImageInputStreamImpl
IOException
public void readFully(int[] i, int off, int len) throws IOException
readFully
in interface ImageInputStream
readFully
in class ImageInputStreamImpl
IOException
public void readFully(long[] l, int off, int len) throws IOException
readFully
in interface ImageInputStream
readFully
in class ImageInputStreamImpl
IOException
public void readFully(float[] f, int off, int len) throws IOException
readFully
in interface ImageInputStream
readFully
in class ImageInputStreamImpl
IOException
public void readFully(double[] d, int off, int len) throws IOException
readFully
in interface ImageInputStream
readFully
in class ImageInputStreamImpl
IOException
public long length()
FileChannel
.
If an IOException
is encountered when querying the
channel's size, -1L will be returned.
length
in interface ImageInputStream
length
in class ImageInputStreamImpl
public void seek(long pos) throws IOException
FileChannel
is not changed, i.e.,
FileChannel.position(long)
is not invoked.
seek
in interface ImageInputStream
seek
in class ImageInputStreamImpl
IOException
public void setByteOrder(ByteOrder networkByteOrder)
setByteOrder
in interface ImageInputStream
setByteOrder
in class ImageInputStreamImpl
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