///////    MatchingLines.java    ///////
import java.io.*;
import java.util.Vector;

public class MatchingLines extends TextLines
{    
    public MatchingLines(String ptrn)
    {   pattern = ptrn;    }

    public MatchingLines(TextLines l, String ptrn)
    {   pattern = ptrn;
        match(l);
    }

    protected MatchingLines() { }

    public int input(InputStream in)
    {   String s;
        BufferedReader rdr = new BufferedReader
                          (new InputStreamReader(in));
        try { while ( (s = rdr.readLine() ) != null )
                 if ( s.lastIndexOf(pattern) > -1 )
                      addLine(s);
            } catch ( IOException e )
              {  System.err.println(
                      "TextLines: Error reading input");
                 return(-1);
              }
        return length();  // number of lines read and matched
    }

    private int match(TextLines l)
    {   if ( l == null || pattern == null )
        {  return 0; }
        int m =0, len = l.length();
        String s;  StringBuffer b;
        for (int j = 0; j < len; j++ )
        {   s = new String(b=l.getLine(j));
            m = s.lastIndexOf(pattern);
            if ( m > -1 ) addLine(b);
        }
        return length();
    }

    protected String pattern;
}