| /* Copyright (c) 2001-2010, The HSQL Development Group |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * Neither the name of the HSQL Development Group nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG, |
| * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| package org.hsqldb.util; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| |
| /** |
| * helper class to write table data to a csv-file (comma separated values). |
| * the first line in file is a list of fieldnames, all following lines |
| * are data lines. |
| * a descptiontion of file format can be found on: http://www.wotsit.org/ |
| * usage: create a object using the constructor. call writeHeader |
| * for writing the filename header then add data with writeData. |
| * at the end close() closes the file. |
| * |
| *@author jeberle@users |
| */ |
| public class CSVWriter { |
| |
| private String newline = System.getProperty("line.separator"); |
| private OutputStreamWriter writer = null; |
| private int nbrCols = 0; |
| private int nbrRows = 0; |
| |
| /** |
| * constructor. |
| * creates a csv file for writing data to it |
| * @param file the file to write data to |
| * @param encoding encoding to use or null (=defualt) |
| */ |
| public CSVWriter(File file, String encoding) throws IOException { |
| |
| if (encoding == null) { |
| encoding = System.getProperty("file.encoding"); |
| } |
| |
| FileOutputStream fout = new FileOutputStream(file); |
| |
| writer = new OutputStreamWriter(fout, encoding); |
| } |
| |
| /** |
| * writes the csv header (fieldnames). should be called after |
| * construction one time. |
| * @param header String[] with fieldnames |
| */ |
| public void writeHeader(String[] header) throws IOException { |
| |
| this.nbrCols = header.length; |
| |
| doWriteData(header); |
| } |
| |
| /** |
| * writes a data-record to the file. note that data[] must have |
| * same number of elements as the header had. |
| * |
| * @param data data to write to csv-file |
| */ |
| public void writeData(String[] data) throws IOException { |
| doWriteData(data); |
| } |
| |
| /** |
| * closes the csv file. |
| */ |
| public void close() throws IOException { |
| this.writer.close(); |
| } |
| |
| private void doWriteData(String[] values) throws IOException { |
| |
| for (int i = 0; i < values.length; i++) { |
| if (i > 0) { |
| this.writer.write(";"); |
| } |
| |
| if (values[i] != null) { |
| this.writer.write("\""); |
| this.writer.write(this.toCsvValue(values[i])); |
| this.writer.write("\""); |
| } |
| } |
| |
| this.writer.write(newline); |
| |
| this.nbrRows++; |
| } |
| |
| private String toCsvValue(String str) { |
| |
| StringBuffer sb = new StringBuffer(); |
| |
| for (int i = 0; i < str.length(); i++) { |
| char c = str.charAt(i); |
| |
| sb.append(c); |
| |
| switch (c) { |
| |
| case '"' : |
| sb.append('"'); |
| break; |
| } |
| } |
| |
| return sb.toString(); |
| } |
| } |