public final class MemoryCacheSeekableStream extends SeekableStream
SeekableStreamthat may be used to wrap a regular
InputStream. Seeking backwards is supported by means of an in-memory cache. For greater efficiency,
FileCacheSeekableStreamshould be used in circumstances that allow the creation of a temporary file.
reset() methods are
This class is not a committed part of the JAI API. It may be removed or changed in future releases of JAI.
|Constructor and Description|
|Modifier and Type||Method and Description|
Returns the current offset in this file.
Reads the next byte of data from the input stream.
Reads up to
Sets the file-pointer offset, measured from the beginning of this file, at which the next read occurs.
finalize, mark, markSupported, readBoolean, readByte, readChar, readCharLE, readDouble, readDoubleLE, readFloat, readFloatLE, readFully, readFully, readInt, readIntLE, readLine, readLong, readLongLE, readShort, readShortLE, readUnsignedByte, readUnsignedInt, readUnsignedIntLE, readUnsignedShort, readUnsignedShortLE, readUTF, reset, skipBytes, wrapInputStream
public MemoryCacheSeekableStream(java.io.InputStream src)
MemoryCacheSeekableStreamthat takes its source data from a regular
InputStream. Seeking backwards is supported by means of an in-memory cache.
public boolean canSeekBackwards()
MemoryCacheSeekableStreaminstances support seeking backwards.
public long getFilePointer()
public void seek(long pos) throws java.io.IOException
public int read() throws java.io.IOException
intin the range
255. If no byte is available because the end of the stream has been reached, the value
-1is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.
public int read(byte b, int off, int len) throws java.io.IOException
lenbytes of data from the input stream into an array of bytes. An attempt is made to read as many as
lenbytes, but a smaller number may be read, possibly zero. The number of bytes actually read is returned as an integer.
This method blocks until input data is available, end of file is detected, or an exception is thrown.
NullPointerException is thrown.
off is negative, or
len is negative, or
off+len is greater than the length of the array
b, then an
len is zero, then no bytes are read and
0 is returned; otherwise, there is an attempt to read at
least one byte. If no byte is available because the stream is at end of
file, the value
-1 is returned; otherwise, at least one
byte is read and stored into
The first byte read is stored into element
next one into
b[off+1], and so on. The number of bytes read
is, at most, equal to
len. Let k be the number of
bytes actually read; these bytes will be stored in elements
In every case, elements
b[off] and elements
b[b.length-1] are unaffected.
If the first byte cannot be read for any reason other than end of
file, then an
IOException is thrown. In particular, an
IOException is thrown if the input stream has been closed.
b- the buffer into which the data is read.
off- the start offset in array
bat which the data is written.
len- the maximum number of bytes to read.
-1if there is no more data because the end of the stream has been reached.
java.io.IOException- if an I/O error occurs.
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