java.io.LineNumberReader Maven / Gradle / Ivy
/*
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documentation, such as a unified set of documents of API signatures for
a platform that includes technologies expressed as Java APIs. The file
may also be used to produce "compilation stubs," which allow
applications to be compiled and validated for such platforms.
Any work generated from this file, such as unified javadocs or compiled
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
http://www.jcp.org/en/jsr/detail?id=219, the latter takes precedence.
*/
package java.io;
/**
* A buffered character-input stream that keeps track of line numbers.
* This class defines methods void setLineNumber(int) and
* int getLineNumber() for setting and getting the current
* line number respectively.
*
* By default, line numbering begins at 0. This number increments as data is
* read, and can be changed with a call to setLineNumber(int).
* Note however, that setLineNumber(int) does not actually change the current
* position in the stream; it only changes the value that will be returned
* by getLineNumber().
*
* A line is considered to be terminated by any one of a line feed ('\n'), a carriage
* return ('\r'), or a carriage return followed immediately by a linefeed.
*
* @version 1.13, 00/02/02
* @author Mark Reinhold
* @since JDK1.1
*/
public class LineNumberReader extends BufferedReader
{
/**
* Create a new line-numbering reader, using the default input-buffer
* size.
*
* @param in a Reader object to provide the underlying stream.
*/
public LineNumberReader(Reader in) {
super(in);
}
/**
* Create a new line-numbering reader, reading characters into a buffer of
* the given size.
*
* @param in a Reader object to provide the underlying stream.
* @param sz an int specifying the size of the buffer.
*/
public LineNumberReader(Reader in, int sz) {
super(in, sz);
}
/**
* Set the current line number.
*
* @param lineNumber an int specifying the line number.
* @see #getLineNumber
*/
public void setLineNumber(int lineNumber) { }
/**
* Get the current line number.
*
* @return The current line number.
* @see #setLineNumber
*/
public int getLineNumber() {
return 0;
}
/**
* Read a single character. Line terminators are compressed into single
* newline ('\n') characters.
*
* @return The character read, or -1 if the end of the stream has been
* reached
*
* @exception IOException If an I/O error occurs
*/
public int read() throws IOException {
return 0;
}
/**
* Read characters into a portion of an array.
*
* @param cbuf Destination buffer
* @param off Offset at which to start storing characters
* @param len Maximum number of characters to read
*
* @return The number of bytes read, or -1 if the end of the stream has
* already been reached
*
* @exception IOException If an I/O error occurs
*/
public int read(char[] cbuf, int off, int len) throws IOException {
return 0;
}
/**
* Read a line of text. A line is considered to be terminated by any one
* of a line feed ('\n'), a carriage return ('\r'), or a carriage return
* followed immediately by a linefeed.
*
* @return A String containing the contents of the line, not including
* any line-termination characters, or null if the end of the
* stream has been reached
*
* @exception IOException If an I/O error occurs
*/
public String readLine() throws IOException {
return null;
}
/**
* Skip characters.
*
* @param n The number of characters to skip
*
* @return The number of characters actually skipped
*
* @exception IOException If an I/O error occurs
*/
public long skip(long n) throws IOException {
return -1;
}
/**
* Mark the present position in the stream. Subsequent calls to reset()
* will attempt to reposition the stream to this point, and will also reset
* the line number appropriately.
*
* @param readAheadLimit Limit on the number of characters that may be
* read while still preserving the mark. After
* reading this many characters, attempting to
* reset the stream may fail.
*
* @exception IOException If an I/O error occurs
*/
public void mark(int readAheadLimit) throws IOException { }
/**
* Reset the stream to the most recent mark.
*
* @exception IOException If the stream has not been marked,
* or if the mark has been invalidated
*/
public void reset() throws IOException { }
}