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java.io
Class CharArrayReader


java.lang.Object
  extended by java.io.Reader
      extended by java.io.CharArrayReader
All Implemented Interfaces:
Closeable , Readable
public class CharArrayReader
extends Reader

This class implements a character buffer that can be used as a character-input stream.

Since:
JDK1.1

Field Summary
protected  char[] buf
          The character buffer.
protected  int count
          The index of the end of this buffer.
protected  int markedPos
          The position of mark in buffer.
protected  int pos
          The current buffer position.
 
Fields inherited from class java.io. Reader
lock
 
Constructor Summary
CharArrayReader (char[] buf)
          Create an CharArrayReader from the specified array of chars.
CharArrayReader (char[] buf, int offset, int length)
          Create an CharArrayReader from the specified array of chars.
 
Method Summary
 void close ()
          Close the stream.
 void mark (int readAheadLimit)
          Mark the present position in the stream.
 boolean markSupported ()
          Tell whether this stream supports the mark() operation, which it does.
 int read ()
          Read a single character.
 int read (char[] b, int off, int len)
          Read characters into a portion of an array.
 boolean ready ()
          Tell whether this stream is ready to be read.
 void reset ()
          Reset the stream to the most recent mark, or to the beginning if it has never been marked.
 long skip (long n)
          Skip characters.
 
Methods inherited from class java.io. Reader
read , read
 
Methods inherited from class java.lang. Object
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait
 

Field Detail

buf


protected char[] buf
The character buffer.

pos


protected int pos
The current buffer position.

markedPos


protected int markedPos
The position of mark in buffer.

count


protected int count
The index of the end of this buffer. There is not valid data at or beyond this index.

Constructor Detail

CharArrayReader


public CharArrayReader(char[] buf)
Create an CharArrayReader from the specified array of chars.

Parameters:
buf - Input buffer (not copied)

CharArrayReader


public CharArrayReader(char[] buf,
                       int offset,
                       int length)
Create an CharArrayReader from the specified array of chars.

The resulting reader will start reading at the given offset . The total number of char values that can be read from this reader will be either length or buf.length-offset , whichever is smaller.

Parameters:
buf - Input buffer (not copied)
offset - Offset of the first char to read
length - Number of chars to read
Throws:
IllegalArgumentException - If offset is negative or greater than buf.length , or if length is negative, or if the sum of these two values is negative.
Method Detail

read


public int read()
         throws IOException
Read a single character.

Overrides:
read in class Reader
Returns:
The character read, as an integer in the range 0 to 65535 ( 0x00-0xffff ), or -1 if the end of the stream has been reached
Throws:
IOException - If an I/O error occurs

read


public int read(char[] b,
                int off,
                int len)
         throws IOException
Read characters into a portion of an array.

Specified by:
read in class Reader
Parameters:
b - Destination buffer
off - Offset at which to start storing characters
len - Maximum number of characters to read
Returns:
The actual number of characters read, or -1 if the end of the stream has been reached
Throws:
IOException - If an I/O error occurs

skip


public long skip(long n)
          throws IOException
Skip characters. Returns the number of characters that were skipped.

The n parameter may be negative, even though the the skip method of the Reader superclass throws an exception in this case. If n is negative, then this method does nothing and returns 0.

Overrides:
skip in class Reader
Parameters:
n - The number of characters to skip
Returns:
The number of characters actually skipped
Throws:
IOException - If the stream is closed, or an I/O error occurs

ready


public boolean ready()
              throws IOException
Tell whether this stream is ready to be read. Character-array readers are always ready to be read.

Overrides:
ready in class Reader
Returns:
True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.
Throws:
IOException - If an I/O error occurs

markSupported


public boolean markSupported()
Tell whether this stream supports the mark() operation, which it does.

Overrides:
markSupported in class Reader
Returns:
true if and only if this stream supports the mark operation.

mark


public void mark(int readAheadLimit)
          throws IOException
Mark the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.

Overrides:
mark in class Reader
Parameters:
readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. Because the stream's input comes from a character array, there is no actual limit; hence this argument is ignored.
Throws:
IOException - If an I/O error occurs

reset


public void reset()
           throws IOException
Reset the stream to the most recent mark, or to the beginning if it has never been marked.

Overrides:
reset in class Reader
Throws:
IOException - If an I/O error occurs

close


public void close()
Close the stream.

Specified by:
close in interface Closeable
Specified by:
close in class Reader