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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. 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.
//
// 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 THE COPYRIGHT HOLDER 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 jodd.util;
import java.util.ArrayList;
import java.util.List;
/**
* Helps with CSV strings.
* See: http://en.wikipedia.org/wiki/Comma-separated_values
*/
public class CsvUtil {
protected static final char FIELD_SEPARATOR = ',';
protected static final char FIELD_QUOTE = '"';
protected static final String DOUBLE_QUOTE = "\"\"";
protected static final String SPECIAL_CHARS = "\r\n";
/**
* Parse fields as csv string,
*/
public static String toCsvString(final Object... elements) {
StringBuilder line = new StringBuilder();
int last = elements.length -1;
for (int i = 0; i < elements.length; i++) {
if (elements[i] == null) {
if (i != last) {
line.append(FIELD_SEPARATOR);
}
continue;
}
String field = elements[i].toString();
// check for special cases
int ndx = field.indexOf(FIELD_SEPARATOR);
if (ndx == -1) {
ndx = field.indexOf(FIELD_QUOTE);
}
if (ndx == -1) {
if (field.startsWith(StringPool.SPACE) || field.endsWith(StringPool.SPACE)) {
ndx = 1;
}
}
if (ndx == -1) {
ndx = StringUtil.indexOfChars(field, SPECIAL_CHARS);
}
// add field
if (ndx != -1) {
line.append(FIELD_QUOTE);
}
field = StringUtil.replace(field, StringPool.QUOTE, DOUBLE_QUOTE);
line.append(field);
if (ndx != -1) {
line.append(FIELD_QUOTE);
}
// last
if (i != last) {
line.append(FIELD_SEPARATOR);
}
}
return line.toString();
}
/**
* Converts CSV line to string array.
*/
public static String[] toStringArray(final String line) {
List row = new ArrayList<>();
boolean inQuotedField = false;
int fieldStart = 0;
final int len = line.length();
for (int i = 0; i < len; i++) {
char c = line.charAt(i);
if (c == FIELD_SEPARATOR) {
if (!inQuotedField) { // ignore we are quoting
addField(row, line, fieldStart, i, inQuotedField);
fieldStart = i + 1;
}
} else if (c == FIELD_QUOTE) {
if (inQuotedField) {
if (i + 1 == len || line.charAt(i + 1) == FIELD_SEPARATOR) { // we are already quoting - peek to see if this is the end of the field
addField(row, line, fieldStart, i, inQuotedField);
fieldStart = i + 2;
i++; // and skip the comma
inQuotedField = false;
}
} else if (fieldStart == i) {
inQuotedField = true; // this is a beginning of a quote
fieldStart++; // move field start
}
}
}
// add last field - but only if string was not empty
if (len > 0 && fieldStart <= len) {
addField(row, line, fieldStart, len, inQuotedField);
}
return row.toArray(new String[0]);
}
private static void addField(final List row, final String line, final int startIndex, final int endIndex, final boolean inQuoted) {
String field = line.substring(startIndex, endIndex);
if (inQuoted) {
field = StringUtil.replace(field, DOUBLE_QUOTE, "\"");
}
row.add(field);
}
}
