IT. Expert System.

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

Direct Known Subclasses:

PushbackReader

public abstract class FilterReader
extends Reader

See Also:

FilterWriter

• Field Summary

  Fields

  Modifier and Type	Field and Description
  protected Reader	in The target Reader which is being filtered.

  • Fields inherited from class java.io.Reader

    lock

• Constructor Summary

  Constructors

  Modifier	Constructor and Description
  protected	FilterReader(Reader in) Constructs a new FilterReader on the Reader in.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  void	close() Closes this reader.
  void	mark(int readlimit) Sets a mark position in this reader.
  boolean	markSupported() Indicates whether this reader supports mark() and reset().
  int	read() Reads a single character from the filtered reader and returns it as an integer with the two higher-order bytes set to 0.
  int	read(char[] buffer, int offset, int count) Reads at most count characters from the filtered reader and stores them in the byte array buffer starting at offset.
  boolean	ready() Indicates whether this reader is ready to be read without blocking.
  void	reset() Resets this reader's position to the last marked location.
  long	skip(long charCount) Skips charCount characters in this reader.

  • 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

  • in

    protected Reader in

    The target Reader which is being filtered.

• Constructor Detail

  • FilterReader

    protected FilterReader(Reader in)

    Constructs a new FilterReader on the Reader in.

    Parameters:

    in - The non-null Reader to filter reads on.

• Method Detail

  • close

    public void close()
               throws IOException

    Closes this reader. This implementation closes the filtered reader.

    Specified by:

    close in interface Closeable

    Specified by:

    close in interface AutoCloseable

    Specified by:

    close in class Reader

    Throws:

    IOException - if an error occurs while closing this reader.

  • mark

    public void mark(int readlimit)
              throws IOException

    Sets a mark position in this reader. The parameter readlimit indicates how many bytes can be read before the mark is invalidated. Sending reset() will reposition this reader back to the marked position, provided that readlimit has not been surpassed.

    This implementation sets a mark in the filtered reader.

    Overrides:

    mark in class Reader

    Parameters:

    readlimit - the number of bytes that can be read from this reader before the mark is invalidated.

    Throws:

    IOException - if an error occurs while marking this reader.

    See Also:

    markSupported(), reset()

  • markSupported

    public boolean markSupported()

    Indicates whether this reader supports mark() and reset(). This implementation returns whether the filtered reader supports marking.

    Overrides:

    markSupported in class Reader

    Returns:

    true if mark() and reset() are supported by the filtered reader, false otherwise.

    See Also:

    mark(int), reset(), skip(long)

  • read

    public int read()
             throws IOException

    Reads a single character from the filtered reader and returns it as an integer with the two higher-order bytes set to 0. Returns -1 if the end of the filtered reader has been reached.

    Overrides:

    read in class Reader

    Returns:

    The character read or -1 if the end of the filtered reader has been reached.

    Throws:

    IOException - if an error occurs while reading from this reader.

  • read

    public int read(char[] buffer,
           int offset,
           int count)
             throws IOException

    Reads at most count characters from the filtered reader and stores them in the byte array buffer starting at offset. Returns the number of characters actually read or -1 if no characters were read and the end of the filtered reader was encountered.

    Specified by:

    read in class Reader

    Parameters:

    buffer - the char array in which to store the characters read.

    offset - the initial position in buffer to store the characters read from this reader.

    count - the maximum number of characters to store in buffer.

    Returns:

    the number of characters actually read or -1 if the end of the filtered reader has been reached while reading.

    Throws:

    IOException - if an error occurs while reading from this reader.

  • ready

    public boolean ready()
                  throws IOException

    Indicates whether this reader is ready to be read without blocking. If the result is true, the next read() will not block. If the result is false, this reader may or may not block when read() is sent.

    Overrides:

    ready in class Reader

    Returns:

    true if this reader will not block when read() is called, false if unknown or blocking will occur.

    Throws:

    IOException - if the reader is closed or some other I/O error occurs.

    See Also:

    Reader.read(), Reader.read(char[]), Reader.read(char[], int, int)

  • reset

    public void reset()
               throws IOException

    Resets this reader's position to the last marked location. Invocations of read() and skip() will occur from this new location. If this reader was not marked, the behavior depends on the implementation of reset() in the Reader subclass that is filtered by this reader. The default behavior for Reader is to throw an IOException.

    Overrides:

    reset in class Reader

    Throws:

    IOException - if a problem occurred or the filtered reader does not support mark() and reset().

    See Also:

    mark(int), markSupported()

  • skip

    public long skip(long charCount)
              throws IOException

    Skips charCount characters in this reader. Subsequent calls to read will not return these characters unless reset is used. The default implementation is to skip characters in the filtered reader.

    Overrides:

    skip in class Reader

    Returns:

    the number of characters actually skipped.

    Throws:

    IOException - if the filtered reader is closed or some other I/O error occurs.

    See Also:

    mark(int), markSupported(), reset()