001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2009 SonarSource SA
004     * mailto:contact AT sonarsource DOT com
005     *
006     * Sonar is free software; you can redistribute it and/or
007     * modify it under the terms of the GNU Lesser General Public
008     * License as published by the Free Software Foundation; either
009     * version 3 of the License, or (at your option) any later version.
010     *
011     * Sonar is distributed in the hope that it will be useful,
012     * but WITHOUT ANY WARRANTY; without even the implied warranty of
013     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014     * Lesser General Public License for more details.
015     *
016     * You should have received a copy of the GNU Lesser General Public
017     * License along with Sonar; if not, write to the Free Software
018     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019     */
020    package org.sonar.squid.text;
021    
022    public class SingleLineCommentHandler extends LineContextHandler {
023    
024      private StringBuilder comment;
025    
026      private final String commentStartTag;
027    
028      public SingleLineCommentHandler(String commentStartTag) {
029        this.commentStartTag = commentStartTag;
030      }
031    
032      @Override
033      boolean matchToEnd(Line line, StringBuilder pendingLine) {
034        if (comment == null) {
035          throw new IllegalStateException("Method doContextBegin(StringBuilder pendingLine) has not been called.");
036        }
037        comment.append((char) getLastCharacter(pendingLine));
038        return false;
039      }
040    
041      @Override
042      boolean matchToBegin(Line line, StringBuilder pendingLine) {
043        boolean doContextBegin = matchEndOfString(pendingLine, commentStartTag);
044        if (doContextBegin) {
045          comment = new StringBuilder(commentStartTag);
046        }
047        return doContextBegin;
048      }
049    
050      @Override
051      boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
052        line.setComment(comment.toString());
053        comment = null;
054        return true;
055      }
056    }