com.helger.commons.io.stream

Class NonBlockingStringReader

java.lang.Object

java.io.Reader

com.helger.commons.io.stream.NonBlockingStringReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

@NotThreadSafe
public class NonBlockingStringReader
extends Reader

A non-synchronized copy of the class StringReader.
Note: super class Reader uses the lock object internally only for long skip(long n) and as this method is overwritten in here, the lock is never used.

Author:

Philip Helger

See Also:

StringReader

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Constructor and Description
NonBlockingStringReader(char[] aChars)
NonBlockingStringReader(char[] aChars, int nOfs, int nLen)
NonBlockingStringReader(String sStr) Creates a new string reader.
NonBlockingStringReader(String sStr, int nOfs, int nLen)

Method Summary

Modifier and Type	Method and Description
void	close() Closes the stream and releases any system resources associated with it.
void	mark(int nReadAheadLimit) Marks the present position in the stream.
boolean	markSupported() Tells whether this stream supports the mark() operation, which it does.
int	read() Reads a single character.
int	read(char[] aBuf, int nOfs, int nLen) Reads characters into a portion of an array.
boolean	ready() Tells whether this stream is ready to be read.
void	reset() Resets the stream to the most recent mark, or to the beginning of the string if it has never been marked.
long	skip(long nCharsToSkip) 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

NonBlockingStringReader

public NonBlockingStringReader(@Nonnull
                               char[] aChars)

NonBlockingStringReader

public NonBlockingStringReader(@Nonnull
                               char[] aChars,
                               @Nonnegative
                               int nOfs,
                               @Nonnegative
                               int nLen)

NonBlockingStringReader

public NonBlockingStringReader(@Nonnull
                               String sStr)

Creates a new string reader.

Parameters:

sStr - String providing the character stream. May not be null.

NonBlockingStringReader

public NonBlockingStringReader(@Nonnull
                               String sStr,
                               @Nonnegative
                               int nOfs,
                               @Nonnegative
                               int nLen)

Method Detail

read

@CheckForSigned
public int read()
                          throws IOException

Reads 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

@CheckForSigned
public int read(@Nonnull
                                 char[] aBuf,
                                 @Nonnegative
                                 int nOfs,
                                 @Nonnegative
                                 int nLen)
                          throws IOException

Reads characters into a portion of an array.

Specified by:

read in class Reader

Parameters:

aBuf - Destination buffer

nOfs - Offset at which to start writing characters

nLen - 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 nCharsToSkip)
          throws IOException

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

Overrides:

skip in class Reader

Parameters:

nCharsToSkip - The parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. Negative values of the parameter 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.

Returns:

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

Throws:

IOException - If an I/O error occurs

ready

public boolean ready()
              throws IOException

Tells 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()

Tells whether this stream supports the mark() operation, which it does.

Overrides:

markSupported in class Reader

Returns:

always true

mark

public void mark(int nReadAheadLimit)
          throws IOException

Marks the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.

Overrides:

mark in class Reader

Parameters:

nReadAheadLimit - 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

Resets 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()

Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), or reset() invocations will throw an IOException. Closing a previously closed stream has no effect.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class Reader