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FX-Text-Area for formatted text and other special effects.

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package org.fxmisc.richtext.demo.hyperlink;

import org.fxmisc.richtext.model.SegmentOpsBase;

import java.util.Optional;

/**
 * Name: HyperlinkOps
 * Description: .
 * @param  S
 * 

 * Comment: ...
 * 
 * Copyright: Copyright (c) 2016-2019
 * Company: >StA-Soft<
 * @author StA
 * @version 1.0
 */

public class HyperlinkOps extends SegmentOpsBase
{

  public HyperlinkOps()
  {
    super(new Hyperlink("", "", ""));
  }

  @Override
  public int length(Hyperlink hyperlink)
  {
    return hyperlink.length();
  }

  @Override
  public char realCharAt(Hyperlink hyperlink, int index)
  {
    return hyperlink.charAt(index);
  }

  @Override
  public String realGetText(Hyperlink hyperlink)
  {
    return hyperlink.getDisplayedText();
  }

  @Override
  public Hyperlink realSubSequence(Hyperlink hyperlink, int start, int end)
  {
    return hyperlink.subSequence(start, end);
  }

  @Override
  public Hyperlink realSubSequence(Hyperlink hyperlink, int start)
  {
    return hyperlink.subSequence(start);
  }

  @Override
  public Optional joinSeg(Hyperlink currentSeg, Hyperlink nextSeg)
  {
    if (currentSeg.isEmpty())
    {
      if (nextSeg.isEmpty())
      {
        return Optional.empty();
      }
      else
      {
        return Optional.of(nextSeg);
      }
    }
    else
    {
      if (nextSeg.isEmpty())
      {
        return Optional.of(currentSeg);
      }
      else
      {
        return concatHyperlinks(currentSeg, nextSeg);
      }
    }
  }

  private Optional concatHyperlinks(Hyperlink leftSeg, Hyperlink rightSeg)
  {
    if (!leftSeg.shareSameAncestor(rightSeg))
    {
      return Optional.empty();
    }

    String original = leftSeg.getOriginalDisplayedText();
    String leftText = leftSeg.getDisplayedText();
    String rightText = rightSeg.getDisplayedText();
    int leftOffset = 0;
    int rightOffset = 0;
    for (int i = 0; i <= original.length() - leftText.length(); i++)
    {
      if (original.regionMatches(i, leftText, 0, leftText.length()))
      {
        leftOffset = i;
        break;
      }
    }
    for (int i = 0; i <= original.length() - rightText.length(); i++)
    {
      if (original.regionMatches(i, rightText, 0, rightText.length()))
      {
        rightOffset = i;
        break;
      }
    }

    if (rightOffset + rightText.length() == leftOffset)
    {
      return Optional.of(leftSeg.mapDisplayedText(rightText + leftText));
    }
    else if (leftOffset + leftText.length() == rightOffset)
    {
      return Optional.of(leftSeg.mapDisplayedText(leftText + rightText));
    }
    else
    {
      return Optional.empty();
    }
  }

}