001    /*
002     * Sonar, open source software quality management tool.
003     * Copyright (C) 2008-2012 SonarSource
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    
021    package org.sonar.squid.text;
022    
023    public class SingleLineCommentHandler extends LineContextHandler {
024    
025      private StringBuilder comment;
026    
027      private final String commentStartTag;
028      private final String commentNotStartTag;
029    
030      public SingleLineCommentHandler(String commentStartTag) {
031        this(commentStartTag, null);
032      }
033    
034      public SingleLineCommentHandler(String commentStartTag, String commentNotStartTag) {
035        this.commentStartTag = commentStartTag;
036        this.commentNotStartTag = commentNotStartTag;
037      }
038    
039      @Override
040      boolean matchToEnd(Line line, StringBuilder pendingLine) {
041        if (comment == null) {
042          throw new IllegalStateException("Method doContextBegin(StringBuilder pendingLine) has not been called.");
043        }
044        comment.append(getLastCharacter(pendingLine));
045        return false;
046      }
047    
048      @Override
049      boolean matchToBegin(Line line, StringBuilder pendingLine) {
050        boolean doContextBegin = matchEndOfString(pendingLine, commentStartTag)
051            && (commentNotStartTag == null || !matchEndOfString(pendingLine, commentNotStartTag));
052        if (doContextBegin) {
053          comment = new StringBuilder(commentStartTag);
054        }
055        return doContextBegin;
056      }
057    
058      @Override
059      boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
060        line.setComment(comment.toString());
061        comment = null;
062        return true;
063      }
064    }