001    /*
002     * SonarQube, open source software quality management tool.
003     * Copyright (C) 2008-2014 SonarSource
004     * mailto:contact AT sonarsource DOT com
005     *
006     * SonarQube 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     * SonarQube 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 License
017     * along with this program; if not, write to the Free Software Foundation,
018     * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
019     */
020    package org.sonar.api.utils.text;
021    
022    import org.apache.commons.lang.StringEscapeUtils;
023    
024    import java.io.IOException;
025    import java.io.Writer;
026    
027    /**
028     * @since 4.2
029     */
030    public class CsvWriter {
031    
032      private final Writer writer;
033      private static final String VALUE_SEPARATOR = ",", LINE_SEPARATOR = "\r\n";
034    
035      private CsvWriter(Writer writer) {
036        this.writer = writer;
037      }
038    
039      public static CsvWriter of(Writer writer) {
040        return new CsvWriter(writer);
041      }
042    
043      public CsvWriter values(String... values) {
044        for (int index = 0; index < values.length; index++) {
045          if (index > 0) {
046            write(VALUE_SEPARATOR);
047          }
048          String value = values[index];
049          if (value != null) {
050            write(StringEscapeUtils.escapeCsv(value));
051          }
052          if (index == values.length - 1) {
053            write(LINE_SEPARATOR);
054          }
055        }
056        return this;
057      }
058    
059      public void close() {
060        try {
061          writer.close();
062        } catch (IOException e) {
063          throw new WriterException("Fail to close CSV output", e);
064        }
065      }
066    
067      private void write(String s) {
068        try {
069          writer.append(s);
070        } catch (IOException e) {
071          throw new WriterException("Fail to generate CSV with value: " + s, e);
072        }
073      }
074    }