/*

  Copyright 2004-2008 Paul R. Holser, Jr.  All rights reserved.

  Licensed under the Academic Free License version 3.0

  */

 package joptsimple.internal;

 import java.text.BreakIterator;

 import java.util.Comparator;

 import java.util.LinkedList;

 import java.util.List;

 import java.util.Locale;

 /**

  * @since 2.1

  * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>

  * @version $Id: Column.java,v 1.6 2008/07/15 04:14:56 pholser Exp $

  */

 public class Column {

     static final Comparator BY_HEIGHT = new Comparator() {

         public int compare( Object first, Object second ) {

             int firstHeight = ( (Column) first ).height();

             int secondHeight = ( (Column) second ).height();

             if ( firstHeight < secondHeight )

                 return -1;

             return firstHeight == secondHeight ? 0 : 1;

         }

     };

     private final String header;

     private final List data;

     private int width;

     private int height;

     Column( String header, int width ) {

         this.header = header;

         this.data = new LinkedList();

         this.width = Math.max( width, header.length() );

         this.height = 0;

     }

     int addCells( Object cellCandidate ) {

         int originalHeight = height;

         String source = String.valueOf( cellCandidate ).trim();

         BreakIterator words = BreakIterator.getLineInstance( Locale.US );

         words.setText( source );

         StringBuffer nextCell = new StringBuffer();

         for ( int start = words.first(), end = words.next();

             end != BreakIterator.DONE;

             start = end, end = words.next() ) {

             nextCell = processNextWord( source, nextCell, start, end );

         }

         if ( nextCell.length() > 0 )

             addCell( nextCell.toString() );

         return height - originalHeight;

     }

     private StringBuffer processNextWord( String source, StringBuffer nextCell,

         int start, int end ) {

         StringBuffer augmented = nextCell;

         String word = source.substring( start, end );

         if ( augmented.length() + word.length() > width ) {

             addCell( augmented.toString() );

             augmented = new StringBuffer( "  " ).append( word );

         }

         else

             augmented.append( word );

         return augmented;

     }

     void addCell( String newCell ) {

         data.add( newCell );

         ++height;

     }

     void writeHeaderOn( StringBuffer buffer, boolean appendSpace ) {

         buffer.append( header )

             .append( Strings.repeat( ' ', width - header.length() ) );

         if ( appendSpace )

             buffer.append( ' ' );

     }

     void writeSeparatorOn( StringBuffer buffer, boolean appendSpace ) {

         buffer.append( Strings.repeat( '-', header.length() ) )

             .append( Strings.repeat( ' ', width - header.length() ) );

         if ( appendSpace )

             buffer.append( ' ' );

     }

     void writeCellOn( int index, StringBuffer buffer, boolean appendSpace ) {

         if ( index < data.size() ) {

             String item = (String) data.get( index );

             buffer.append( item )

                 .append( Strings.repeat( ' ', width - item.length() ) );

             if ( appendSpace )

                 buffer.append( ' ' );

         }

     }

     int height() {

         return height;

     }

 }