java.io.FilterReader Maven / Gradle / Ivy
/*
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stub files, must be accompanied by this notice in its entirety.
This work corresponds to the API signatures of JSR 219: Foundation
Profile 1.1. In the event of a discrepency between this work and the
JSR 219 specification, which is available at
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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.
*
* @version 1.11, 00/02/02
* @author Mark Reinhold
* @since JDK1.1
*/
public abstract class FilterReader extends Reader
{
/**
* The underlying character-input stream.
*/
protected Reader in;
/**
* Create a new filtered reader.
*
* @param in a Reader object providing the underlying stream.
* @throws NullPointerException if in is null
*/
protected FilterReader(Reader in) { }
/**
* Read a single character.
*
* @exception IOException If an I/O error occurs
*/
public int read() throws IOException {
return 0;
}
/**
* Read 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 0;
}
/**
* Skip characters.
*
* @exception IOException If an I/O error occurs
*/
public long skip(long n) throws IOException {
return -1;
}
/**
* Tell whether this stream is ready to be read.
*
* @exception IOException If an I/O error occurs
*/
public boolean ready() throws IOException {
return false;
}
/**
* Tell whether this stream supports the mark() operation.
*/
public boolean markSupported() {
return false;
}
/**
* Mark the present position in the stream.
*
* @exception IOException If an I/O error occurs
*/
public void mark(int readAheadLimit) throws IOException { }
/**
* Reset the stream.
*
* @exception IOException If an I/O error occurs
*/
public void reset() throws IOException { }
/**
* Close the stream.
*
* @exception IOException If an I/O error occurs
*/
public void close() throws IOException { }
}