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javax.imageio.stream
Class MemoryCacheImageInputStream
java.lang.Object
javax.imageio.stream.ImageInputStreamImpl
javax.imageio.stream.MemoryCacheImageInputStream
-
All Implemented Interfaces:
-
DataInput
,
ImageInputStream
-
public class MemoryCacheImageInputStream
- extends ImageInputStreamImpl
An implementation of ImageInputStream that gets its input from a regular InputStream. A memory buffer is used to cache at least the data between the discard position and the current read position.
In general, it is preferable to use a FileCacheImageInputStream when reading from a regular InputStream. This class is provided for cases where it is not possible to create a writable temporary file.
Method Summary
|
void |
close
()
Closes this MemoryCacheImageInputStream, freeing the cache. |
protected void
|
finalize
()
Finalizes this object prior to garbage collection.
|
void |
flushBefore
(long pos)
Discards the initial portion of the stream prior to the indicated postion. |
boolean |
isCached
()
Returns true since this ImageInputStream caches data in order to allow seeking backwards. |
boolean |
isCachedFile
()
Returns false since this ImageInputStream does not maintain a file cache. |
boolean |
isCachedMemory
()
Returns true since this ImageInputStream maintains a main memory cache. |
int |
read
()
Reads a single byte from the stream and returns it as an
int
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. |
Methods inherited from class javax.imageio.stream.
ImageInputStreamImpl
|
checkClosed
,
finalize
,
flush
,
getBitOffset
,
getByteOrder
,
getFlushedPosition
,
getStreamPosition
,
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
,
seek
,
setBitOffset
,
setByteOrder
,
skipBytes
,
skipBytes
|
MemoryCacheImageInputStream
public MemoryCacheImageInputStream(InputStream stream)
-
Constructs a MemoryCacheImageInputStream that will read from a given InputStream.
-
Parameters:
-
stream - an InputStream to read from.
-
Throws:
-
IllegalArgumentException
- if stream is null.
read
public int read()
throws IOException
-
Description copied from
class:
ImageInputStreamImpl
interface:
ImageInputStream
-
Reads a single byte from the stream and returns it as an
int
integer
between 0 and 255. If
EOF
the end of the stream
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 is reset to zero before the read occurs.
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.
a byte value from the stream, as an int, or -1 to indicate EOF.
-
Throws:
-
IOException
- if the stream has been closed.
- 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.
flushBefore
public void flushBefore(long pos)
throws IOException
-
Description copied from interface:
ImageInputStream
-
Discards the initial portion of the stream prior to the indicated postion. Attempting to seek to an offset within the flushed portion of the stream will result in an IndexOutOfBoundsException.
Calling flushBefore may allow classes implementing this interface to free up resources such as memory or disk space that are being used to store data from the stream.
-
-
Specified by:
-
flushBefore
in interface
ImageInputStream
-
Overrides:
-
flushBefore
in class
ImageInputStreamImpl
-
-
Parameters:
-
pos - a long containing the length of the
stream
file
prefix that may be flushed. -
Throws:
-
IOException
- if an I/O error occurs.
isCached
public boolean isCached()
-
Returns true since this ImageInputStream caches data in order to allow seeking backwards.
-
-
Specified by:
-
isCached
in interface
ImageInputStream
-
Overrides:
-
isCached
in class
ImageInputStreamImpl
-
-
Returns:
-
true.
-
See Also:
-
isCachedMemory()
,
isCachedFile()
isCachedFile
public boolean isCachedFile()
-
Returns false since this ImageInputStream does not maintain a file cache.
-
-
Specified by:
-
isCachedFile
in interface
ImageInputStream
-
Overrides:
-
isCachedFile
in class
ImageInputStreamImpl
-
-
Returns:
-
false.
-
See Also:
-
isCached()
,
isCachedMemory()
isCachedMemory
public boolean isCachedMemory()
-
Returns true since this ImageInputStream maintains a main memory cache.
-
-
Specified by:
-
isCachedMemory
in interface
ImageInputStream
-
Overrides:
-
isCachedMemory
in class
ImageInputStreamImpl
-
-
Returns:
-
true.
-
See Also:
-
isCached()
,
isCachedFile()
close
public void close()
throws IOException
-
Closes this MemoryCacheImageInputStream, freeing the cache. The source InputStream is not closed.
-
-
Specified by:
-
close
in interface
ImageInputStream
-
Overrides:
-
close
in class
ImageInputStreamImpl
-
-
Throws:
-
IOException
- if an I/O error occurs.
finalize
protected void finalize ()
throws Throwable
-
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.