java.io
Class StringReader

java.lang.Object
  java.io.Reader
      java.io.StringReader

All Implemented Interfaces:

Closeable, Readable

public class StringReader
extends Reader

A character stream whose source is a string.

Since:

JDK1.1

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

StringReader(String s)
Create a new string reader.

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[] cbuf, 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 of the string if it has never been marked.
long	skip(long ns) Skips the specified number of characters in the stream.

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

Constructor Detail

StringReader

public StringReader(String s)

Create a new string reader.

Parameters:

s - String providing the character stream.

Method Detail

read

public int read()
         throws IOException

Read a single character.

Overrides:

read in class Reader

Returns:

The character read, or -1 if the end of the stream has been reached

Throws:

IOException - If an I/O error occurs

read

public int read(char[] cbuf,
                int off,
                int len)
         throws IOException

Read characters into a portion of an array.

Specified by:

read in class Reader

Parameters:

cbuf - Destination buffer

off - Offset at which to start writing characters

len - Maximum number of characters to read

Returns:

The 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 ns)
          throws IOException

Skips the specified number of characters in the stream. Returns the number of characters that were skipped.

The ns parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. Negative values of ns cause the stream to skip backwards. Negative return values indicate a skip backwards. It is not possible to skip backwards past the beginning of the string.

If the entire string has been read or skipped, then this method has no effect and always returns 0.

Overrides:

skip in class Reader

Parameters:

ns - The number of characters to skip

Returns:

The number of characters actually skipped

Throws:

IOException - If an I/O error occurs

ready

public boolean ready()
              throws IOException

Tell whether this stream is ready to be read.

Overrides:

ready in class Reader

Returns:

True if the next read() is guaranteed not to block for input

Throws:

IOException - If the stream is closed

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 string, there is no actual limit, so this argument must not be negative, but is otherwise ignored.

Throws:

IllegalArgumentException - If readAheadLimit is < 0

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 of the string 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