import java.io.BufferedReader;
import java.io.IOException;


// -------------------------------------------------------------------------
/**
 *  This class provides basic line- and character-counting behavior for
 *  buffered reader input sources.  The object keeps a running total
 *  over all input sources that have been counted.
 *
 *  @author  Stephen Edwards
 *  @version Feb 22, 2005
 */
public class LineCounter
{
    //~ Instance/static variables .............................................

    private int lines = 0;
    private int chars = 0;


    //~ Constructor ...........................................................

    // ----------------------------------------------------------
    /**
     * Creates a new LineCounter object.
     */
    public LineCounter()
    {
        // no action needed
    }


    //~ Methods ...............................................................

    // ----------------------------------------------------------
    /**
     * Getter for the lines property.
     * @return the current line count
     */
    public int lines()
    {
        return lines;
    }


    // ----------------------------------------------------------
    /**
     * Getter for the characters property.
     * @return the current character count
     */
    public int characters()
    {
        return chars;
    }


    // ----------------------------------------------------------
    /**
     * Consume all the input from the given input source, counting the
     * number of lines and characters read in.  The counts for this
     * stream are added to the running totals stored in this line counter
     * object.
     * @param in the stream to read from
     * @throws IOException if there is an error reading from the stream
     */
    public void count( BufferedReader in )
        throws IOException
    {
        lines = 0;
        chars = 0;
        String line = in.readLine();
        while ( line != null )
        {
            ++lines;
            chars += line.length();
            line = in.readLine();
        }
    }


    // ----------------------------------------------------------
    /**
     * Open the given file and count the number of lines and characters
     * it contains.  The counts for this file are added to the running
     * totals stored in this line counter object.
     * @param fileName the name of the file to count
     */
    public void countFile( String fileName )
    {
        try
        {
            BufferedReader in =
                new BufferedReader( new java.io.FileReader( fileName ) );
            count( in );
            in.close();
        }
        catch ( IOException e )
        {
            e.printStackTrace();
        }
    }


    // ----------------------------------------------------------
    /**
     * Open the given URL and count the number of lines and characters
     * it contains.  The counts for this URL are added to the running
     * totals stored in this line counter object.
     * @param url the web page to count
     */
    public void countURL( String url )
    {
        try
        {
            BufferedReader in = new BufferedReader(
                new java.io.InputStreamReader(
                    new java.net.URL( url ).openStream() ) );
            count( in );
            in.close();
        }
        catch ( IOException e )
        {
            e.printStackTrace();
        }
    }
}