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/* LineBreakMeasurer.java

   Copyright (C) 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.awt.font;

import java.text.AttributedCharacterIterator;

import java.text.BreakIterator;

public final class LineBreakMeasurer

{

  private AttributedCharacterIterator text;

  private int position;

  private TextMeasurer tm;

  private int numChars;

  public LineBreakMeasurer(AttributedCharacterIterator text,

                           BreakIterator breakIter, FontRenderContext frc)

  {

    this( text, frc );

  }

  public LineBreakMeasurer(AttributedCharacterIterator text,

                           FontRenderContext frc)

  {

    this.text = text;

    position = 0;

    numChars = text.getEndIndex();

    tm = new TextMeasurer( text, frc );

  }

  public void deleteChar(AttributedCharacterIterator newParagraph,

                         int deletePos)

  {

    tm.deleteChar( newParagraph, deletePos );

    position = 0;

  }

  public void insertChar(AttributedCharacterIterator newParagraph,

                         int insertPos)

  {

    tm.insertChar( newParagraph, insertPos );

    position = 0;

  }

  public TextLayout nextLayout(float wrappingWidth)

  {

    return nextLayout( wrappingWidth, numChars, false );

  }

  public TextLayout nextLayout(float wrappingWidth, int offsetLimit,

                               boolean requireNextWord)

  {

    int next = nextOffset( wrappingWidth, offsetLimit, requireNextWord );

    TextLayout tl = tm.getLayout( position, next );

    position = next;

    return tl;

  }

  public int nextOffset(float wrappingWidth)

  {

    return nextOffset( wrappingWidth, numChars, false );

  }

  public int nextOffset(float wrappingWidth, int offsetLimit,

                        boolean requireNextWord)

  {

    int guessOffset = tm.getLineBreakIndex(position, wrappingWidth);

    if( offsetLimit > numChars )

      offsetLimit = numChars;

    if( guessOffset > offsetLimit )

      {

        text.setIndex( offsetLimit );

        return offsetLimit;

      }

    text.setIndex( guessOffset );

    // If we're on a breaking character, return directly

    if( Character.isWhitespace( text.current() ) )

      return guessOffset;

    // Otherwise jump forward or backward to the last such char.

    if( !requireNextWord )

      while( !Character.isWhitespace( text.previous() ) &&

             guessOffset > position )

        guessOffset--;

    else

      while( !Character.isWhitespace( text.next() ) &&

             guessOffset < offsetLimit )

        guessOffset++;

    if( guessOffset > offsetLimit )

      {

        text.setIndex( offsetLimit );

        return offsetLimit;

      }

    text.setIndex( guessOffset );

    return guessOffset;

  }

  public void setPosition(int newPosition)

  {

    position = newPosition;

  }

  public int getPosition()

  {

    return position;

  }

}