Class LookaheadReader

java.lang.Object
net.sf.statcvs.util.LookaheadReader

public class LookaheadReader extends Object

Wraps a Reader for line-by-line access. This works like Iterator: hasNextLine() returns true if another line can be read; nextLine reads the next line and returns it. Additionally, getCurrentLine() can be used to access multiple times the line returned by nextLine().

At construction time, getCurrentLine() is undefined. nextLine() must be called once to read the first line.

Version:
$Id: LookaheadReader.java,v 1.4 2008/04/02 11:22:15 benoitx Exp $
Author:
Richard Cyganiak (richard@cyganiak.de)
  • Constructor Details

    • LookaheadReader

      public LookaheadReader(Reader reader)
      Creates a LookaheadReader from a source reader.
      Parameters:
      reader - a reader whose contents will be returned by the LookaheadReader
  • Method Details

    • getCurrentLine

      public String getCurrentLine()
      Returns the current line without reading a line from the source reader. Will throw an exception if nextLine was not called before.
      Returns:
      The line returned by the previous call to nextLine()
      Throws:
      NoSuchElementException - if nextLine was not yet called
    • nextLine

      public String nextLine() throws IOException
      Reads and returns a line from the source reader. The result of this call will be the new current line. Will throw an exception if trying to read from after the end of the source reader.
      Returns:
      The next line of the source reader
      Throws:
      IOException - on error while reading the source reader
      NoSuchElementException - if hasNextLine() is false
    • hasNextLine

      public boolean hasNextLine() throws IOException
      Checks if more lines are available for reading.
      Returns:
      true if at least one more line can be read
      Throws:
      IOException - on error while reading the source reader
    • getLineNumber

      public int getLineNumber()
      Returns the number of the line that would be returned by getCurrentLine(), or 0 before the first call to nextLine. The first line has line number 1.
      Returns:
      the current line number