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package java.io;


Abstract class for reading filtered character streams.
The abstract class FilterReader itself
provides default methods that pass all requests to
the contained stream. Subclasses of FilterReader
should override some of these methods and may also provide
additional methods and fields.
Author:
     Mark Reinhold
Since:
      JDK1.1/**
 * Abstract class for reading filtered character streams.
 * The abstract class <code>FilterReader</code> itself
 * provides default methods that pass all requests to
 * the contained stream. Subclasses of <code>FilterReader</code>
 * should override some of these methods and may also provide
 * additional methods and fields.
 *
 * @author      Mark Reinhold
 * @since       JDK1.1
 */

public abstract class FilterReader extends Reader {

    
The underlying character-input stream.
/**
     * The underlying character-input stream.
     */
    protected Reader in;

    
Creates a new filtered reader.
Params:
in –  a Reader object providing the underlying stream.
Throws:
NullPointerException – if in is null/**
     * Creates a new filtered reader.
     *
     * @param in  a Reader object providing the underlying stream.
     * @throws NullPointerException if <code>in</code> is <code>null</code>
     */
    protected FilterReader(Reader in) {
        super(in);
        this.in = in;
    }

    
Reads a single character.
Throws:
IOException –  If an I/O error occurs/**
     * Reads a single character.
     *
     * @exception  IOException  If an I/O error occurs
     */
    public int read() throws IOException {
        return in.read();
    }

    
Reads characters into a portion of an array.
Throws:
IOException –  If an I/O error occurs/**
     * Reads characters into a portion of an array.
     *
     * @exception  IOException  If an I/O error occurs
     */
    public int read(char cbuf[], int off, int len) throws IOException {
        return in.read(cbuf, off, len);
    }

    
Skips characters.
Throws:
IOException –  If an I/O error occurs/**
     * Skips characters.
     *
     * @exception  IOException  If an I/O error occurs
     */
    public long skip(long n) throws IOException {
        return in.skip(n);
    }

    
Tells whether this stream is ready to be read.
Throws:
IOException –  If an I/O error occurs/**
     * Tells whether this stream is ready to be read.
     *
     * @exception  IOException  If an I/O error occurs
     */
    public boolean ready() throws IOException {
        return in.ready();
    }

    
Tells whether this stream supports the mark() operation.
/**
     * Tells whether this stream supports the mark() operation.
     */
    public boolean markSupported() {
        return in.markSupported();
    }

    
Marks the present position in the stream.
Throws:
IOException –  If an I/O error occurs/**
     * Marks the present position in the stream.
     *
     * @exception  IOException  If an I/O error occurs
     */
    public void mark(int readAheadLimit) throws IOException {
        in.mark(readAheadLimit);
    }

    
Resets the stream.
Throws:
IOException –  If an I/O error occurs/**
     * Resets the stream.
     *
     * @exception  IOException  If an I/O error occurs
     */
    public void reset() throws IOException {
        in.reset();
    }

    public void close() throws IOException {
        in.close();
    }

}