Java Doc for MemoryCacheSeekableStream.java in  » Graphic-Library » xmlgraphics-commons-1.2 » org » apache » xmlgraphics » image » codec » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Graphic Library » xmlgraphics commons 1.2 » org.apache.xmlgraphics.image.codec.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.io.InputStream
      org.apache.xmlgraphics.image.codec.util.SeekableStream
         org.apache.xmlgraphics.image.codec.util.MemoryCacheSeekableStream

MemoryCacheSeekableStream
final public class MemoryCacheSeekableStream extends SeekableStream (Code)
A subclass of SeekableStream that may be used to wrap a regular InputStream. Seeking backwards is supported by means of an in-memory cache. For greater efficiency, FileCacheSeekableStream should be used in circumstances that allow the creation of a temporary file.

The mark() and reset() methods are supported.

This class is not a committed part of the JAI API. It may be removed or changed in future releases of JAI.



Field Summary
 booleanfoundEOS
    
 intlength
     Number of bytes read.
 intsectors
     Number of sectors stored.

Constructor Summary
public  MemoryCacheSeekableStream(InputStream src)
     Constructs a MemoryCacheSeekableStream that takes its source data from a regular InputStream.

Method Summary
public  booleancanSeekBackwards()
     Returns true since all MemoryCacheSeekableStream instances support seeking backwards.
public  longgetFilePointer()
     Returns the current offset in this file.
public  intread()
     Reads the next byte of data from the input stream.
public  intread(byte[] b, int off, int len)
     Reads up to len bytes of data from the input stream into an array of bytes.
public  voidseek(long pos)
     Sets the file-pointer offset, measured from the beginning of this file, at which the next read occurs.

Field Detail
foundEOS
boolean foundEOS(Code)
True if we've previously reached the end of the source stream



length
int length(Code)
Number of bytes read.



sectors
int sectors(Code)
Number of sectors stored.




Constructor Detail
MemoryCacheSeekableStream
public MemoryCacheSeekableStream(InputStream src)(Code)
Constructs a MemoryCacheSeekableStream that takes its source data from a regular InputStream. Seeking backwards is supported by means of an in-memory cache.




Method Detail
canSeekBackwards
public boolean canSeekBackwards()(Code)
Returns true since all MemoryCacheSeekableStream instances support seeking backwards.



getFilePointer
public long getFilePointer()(Code)
Returns the current offset in this file. the offset from the beginning of the file, in bytes,at which the next read occurs.



read
public int read() throws IOException(Code)
Reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown. the next byte of data, or -1 if the end of thestream is reached.



read
public int read(byte[] b, int off, int len) throws IOException(Code)
Reads up to len bytes of data from the input stream into an array of bytes. An attempt is made to read as many as len bytes, 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.

If b is null, a NullPointerException is thrown.

If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown.

If 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 b.

The first byte read is stored into element b[off], the 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 b[off] through b[off+k-1], leaving elements b[off+k] through b[off+len-1] unaffected.

In every case, elements b[0] through b[off] and elements b[off+len] through 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.
Parameters:
  b - the buffer into which the data is read.
Parameters:
  off - the start offset in array bat which the data is written.
Parameters:
  len - the maximum number of bytes to read. the total number of bytes read into the buffer, or-1 if there is no more data because the end ofthe stream has been reached.




seek
public void seek(long pos) throws IOException(Code)
Sets the file-pointer offset, measured from the beginning of this file, at which the next read occurs.
Parameters:
  pos - the offset position, measured in bytes from thebeginning of the file, at which to set the filepointer.
exception:
  IOException - if pos is less than0 or if an I/O error occurs.



Fields inherited from org.apache.xmlgraphics.image.codec.util.SeekableStream
protected long markPos(Code)(Java Doc)

Methods inherited from org.apache.xmlgraphics.image.codec.util.SeekableStream
public boolean canSeekBackwards()(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
abstract public long getFilePointer() throws IOException(Code)(Java Doc)
public synchronized void mark(int readLimit)(Code)(Java Doc)
public boolean markSupported()(Code)(Java Doc)
abstract public int read() throws IOException(Code)(Java Doc)
abstract public int read(byte[] b, int off, int len) throws IOException(Code)(Java Doc)
final public boolean readBoolean() throws IOException(Code)(Java Doc)
final public byte readByte() throws IOException(Code)(Java Doc)
final public char readChar() throws IOException(Code)(Java Doc)
final public char readCharLE() throws IOException(Code)(Java Doc)
final public double readDouble() throws IOException(Code)(Java Doc)
final public double readDoubleLE() throws IOException(Code)(Java Doc)
final public float readFloat() throws IOException(Code)(Java Doc)
final public float readFloatLE() throws IOException(Code)(Java Doc)
final public void readFully(byte[] b) throws IOException(Code)(Java Doc)
final public void readFully(byte[] b, int off, int len) throws IOException(Code)(Java Doc)
final public int readInt() throws IOException(Code)(Java Doc)
final public int readIntLE() throws IOException(Code)(Java Doc)
final public String readLine() throws IOException(Code)(Java Doc)
final public long readLong() throws IOException(Code)(Java Doc)
final public long readLongLE() throws IOException(Code)(Java Doc)
final public short readShort() throws IOException(Code)(Java Doc)
final public short readShortLE() throws IOException(Code)(Java Doc)
final public String readUTF() throws IOException(Code)(Java Doc)
final public int readUnsignedByte() throws IOException(Code)(Java Doc)
final public long readUnsignedInt() throws IOException(Code)(Java Doc)
final public long readUnsignedIntLE() throws IOException(Code)(Java Doc)
final public int readUnsignedShort() throws IOException(Code)(Java Doc)
final public int readUnsignedShortLE() throws IOException(Code)(Java Doc)
public synchronized void reset() throws IOException(Code)(Java Doc)
abstract public void seek(long pos) throws IOException(Code)(Java Doc)
public int skipBytes(int n) throws IOException(Code)(Java Doc)
public static SeekableStream wrapInputStream(InputStream is, boolean canSeekBackwards)(Code)(Java Doc)

Methods inherited from java.io.InputStream
public int available() throws IOException(Code)(Java Doc)
public void close() throws IOException(Code)(Java Doc)
public synchronized void mark(int readlimit)(Code)(Java Doc)
public boolean markSupported()(Code)(Java Doc)
abstract public int read() throws IOException(Code)(Java Doc)
public int read(byte b) throws IOException(Code)(Java Doc)
public int read(byte b, int off, int len) throws IOException(Code)(Java Doc)
public synchronized void reset() throws IOException(Code)(Java Doc)
public long skip(long n) throws IOException(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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