/*
 * Sonar Delphi Plugin
 * Copyright (C) 2011 Sabre Airline Solutions and Fabricio Colombo
 * Author(s):
 * Przemyslaw Kociolek (przemyslaw.kociolek@sabre.com)
 * Michal Wojcik (michal.wojcik@sabre.com)
 * Fabricio Colombo (fabricio.colombo.mva@gmail.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.plugins.delphi.metrics.basicmetrics;

public class SingleLineCommentHandler extends LineContextHandler {

  private StringBuilder comment;

  private final String commentStartTag;
  private final String commentNotStartTag;

  public SingleLineCommentHandler(String commentStartTag) {
    this(commentStartTag, null);
  }

  public SingleLineCommentHandler(String commentStartTag, String commentNotStartTag) {
    this.commentStartTag = commentStartTag;
    this.commentNotStartTag = commentNotStartTag;
  }

  @Override
  boolean matchToEnd(Line line, StringBuilder pendingLine) {
    if (comment == null) {
      throw new IllegalStateException("Method doContextBegin(StringBuilder pendingLine) has not been called.");
    }
    comment.append(getLastCharacter(pendingLine));
    line.isThereCode();

    return false;
  }

  @Override
  boolean matchToBegin(Line line, StringBuilder pendingLine) {
    boolean doContextBegin = matchEndOfString(pendingLine, commentStartTag)
      && (commentNotStartTag == null || !matchEndOfString(pendingLine, commentNotStartTag));
    if (doContextBegin) {
      comment = new StringBuilder(commentStartTag);
    }
    return doContextBegin;
  }

  @Override
  boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
    String newComment = "";
    String oldComment = line.getComment();

    if (oldComment != null) {
      newComment = oldComment.concat(comment.toString());
    } else {
      newComment = comment.toString();
    }

    line.setComment(newComment);
    comment = null;
    return true;
  }
}
