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'Databene Formats' is an open source software library for supporting
data file and other formats like CSV, fixed width files, XLS, Properties and Regex.
It is designed for multithreaded use and high performance.
/*
* Copyright (C) 2011-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.formats.csv;
import org.databene.commons.ArrayBuilder;
import org.databene.commons.ArrayFormat;
import org.databene.commons.ConfigurationError;
import org.databene.commons.IOUtil;
import org.databene.commons.SystemInfo;
import org.databene.formats.DataContainer;
import org.databene.formats.DataIterator;
import java.io.IOException;
import java.io.StringReader;
import java.io.Writer;
import java.util.List;
import java.util.ArrayList;
/**
* Utility methods for CSV processing.
*
* Created: 07.06.2007 07:44:28
* @since 0.5.4
* @author Volker Bergmann
*/
public class CSVUtil {
public static String[] parseHeader(String uri, char separator, String encoding) {
DataIterator cellIterator = null;
try {
cellIterator = new CSVLineIterator(uri, separator, true, encoding);
DataContainer tmp = cellIterator.next(new DataContainer());
if (tmp != null)
return tmp.getData();
else
throw new ConfigurationError("empty CSV file");
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
IOUtil.close(cellIterator);
}
}
public static String[][] parseRows(String url, char separator) throws IOException {
return parseRows(url, separator, SystemInfo.getFileEncoding());
}
public static String[][] parseRows(String url, char separator, String encoding) throws IOException {
List lines = new ArrayList();
CSVLineIterator iterator = new CSVLineIterator(url, separator, encoding);
DataContainer container = new DataContainer();
while ((container = iterator.next(container)) != null)
lines.add(container.getData());
iterator.close();
String[][] result = new String[lines.size()][];
return lines.toArray(result);
}
public static String[] parseCSVRow(String text) {
ArrayBuilder builder = new ArrayBuilder(String.class);
CSVTokenizer tokenizer = new CSVTokenizer(new StringReader(text));
try {
CSVTokenType type;
while ((type = tokenizer.next()) != CSVTokenType.EOL && type != CSVTokenType.EOF)
builder.add(tokenizer.cell);
return builder.toArray();
} catch (IOException e) {
throw new RuntimeException("Error parsing CSV row: " + text, e);
} finally {
IOUtil.close(tokenizer);
}
}
public static void writeRow(Writer out, char separator, String... cells) throws IOException {
if (cells.length > 0)
out.write(renderCell(cells[0], separator));
for (int i = 1; i < cells.length; i++) {
out.write(separator);
out.write(renderCell(cells[i], separator));
}
out.write(SystemInfo.getLineSeparator());
}
public static String renderCell(String text, char separator) {
if (text == null)
return "";
if (text.indexOf(separator) < 0 && text.indexOf('"') < 0)
return text;
text = text.replace("\"", "\"\"");
return '"' + text + '"';
}
public static String formatHeaderWithLineFeed(char separator, String... propertyNames) {
return ArrayFormat.format(String.valueOf(separator), propertyNames) + SystemInfo.getLineSeparator();
}
}