Csv Converter
/*
*
* Copyright (c) 2004 SourceTap - www.sourcetap.com
*
* The contents of this file are subject to the SourceTap Public License
* ("License"); You may not use this file except in compliance with the
* License. You may obtain a copy of the License at http://www.sourcetap.com/license.htm
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
*/
import java.io.BufferedReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
/**
*
* @author Administrator
* @version
*/
public class CsvConverter {
private static String DELIM = ",";
private String[] headers = null;
private ArrayList data = new ArrayList();
public CsvConverter(Reader in) {
String line = "";
boolean doHeader = true;
StringTokenizer st = null;
try {
BufferedReader br = new BufferedReader(in);
while ((line = br.readLine()) != null) {
if (line == null) {
throw new IOException("Empty Data Source");
}
if (doHeader) {
headers = breakCSVStringApart(line);
doHeader = false;
} else {
String[] rowArray = breakCSVStringApart(line);
if ((rowArray.length < headers.length) &&
(rowArray.length < 2)) {
//skip as blank row
} else {
data.add(rowArray);
}
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
in.close();
} catch (Exception e) {
;
}
}
}
/**
* DOCUMENT ME!
*
* @return
*
* @throws IOException
*/
public String[] getHeader() throws IOException {
return headers;
}
/**
* DOCUMENT ME!
*
* @return
*
* @throws IOException
*/
public ArrayList getData() throws IOException {
return data;
}
/**
* DOCUMENT ME!
*
* @param fileName
*/
public void writeToFile(String fileName) {
try {
FileWriter bwOut = new FileWriter(fileName);
//write headers
for (int i = 0; i < headers.length; i++) {
bwOut.write(createCSVField(headers[i]));
if (i != (headers.length - 1)) {
bwOut.write(",");
}
}
bwOut.write("\n");
//write data
for (int i = 0; i < data.size(); i++) {
String[] dataArray = (String[]) data.get(i);
for (int j = 0; j < dataArray.length; j++) {
bwOut.write(createCSVField(dataArray[j]));
if (j != (dataArray.length - 1)) {
bwOut.write(",");
}
}
bwOut.write("\n");
}
bwOut.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* DOCUMENT ME!
*
* @param in
*
* @return
*/
public String[] breakCSVStringApart(String in) {
StringBuffer curString = new StringBuffer();
List strings = new ArrayList();
boolean escaped = false;
boolean inquotedstring = false;
for (int i = 0; i < in.length(); i++) {
char c = in.charAt(i);
switch (c) {
case ',':
if (inquotedstring) {
curString.append(',');
} else {
strings.add(curString.toString().trim());
curString = new StringBuffer();
}
case ' ':
// end word
//if (inquotedstring) {
curString.append(' ');
//}
break;
case '\t':
// end word
if (inquotedstring) {
curString.append('\t');
}
break;
case '"':
if (escaped) {
curString.append('"');
escaped = false;
} else if (inquotedstring) {
inquotedstring = false;
//strings.add(curString.toString());
//curString = new StringBuffer();
} else {
inquotedstring = true;
}
break;
case '\\':
if (escaped) {
curString.append("\\");
escaped = false;
} else {
escaped = true;
}
break;
default:
if (escaped) {
switch (c) {
case 'n':
curString.append('\n');
break;
case 't':
curString.append('\t');
break;
case 'r':
curString.append('\r');
break;
default:
break;
}
escaped = false;
} else {
curString.append(c);
}
}
}
if (curString.length() > 0) {
strings.add(curString.toString().trim());
}
return (String[]) strings.toArray(new String[0]);
}
/**
* DOCUMENT ME!
*
* @param in
*
* @return
*/
public static String createCSVField(String in) {
StringBuffer curString = new StringBuffer();
boolean needsQuotes = false;
for (int i = 0; i < in.length(); i++) {
char c = in.charAt(i);
switch (c) {
case '\n':
curString.append("\\n");
break;
case '\t':
curString.append("\\t");
break;
case '\r':
curString.append("\\r");
break;
case ',':
curString.append(",");
needsQuotes = true;
break;
case '\\':
curString.append("\\\\");
break;
case '"':
curString.append("\\\"");
break;
default:
curString.append(c);
break;
}
}
if (needsQuotes) {
return "\"" + curString.toString() + "\"";
} else {
return curString.toString();
}
}
}
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