com.darwinsys.csv.CSVImport Maven / Gradle / Ivy
package com.darwinsys.csv;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
/** Parse comma-separated values (CSV), a common Windows file format.
* Sample input: "LU",86.25,"11/4/1998","2:19PM",+4.0625
*
* Inner logic adapted from a C++ original that was
* Copyright (C) 1999 Lucent Technologies
* Excerpted from 'The Practice of Programming'
* by Brian W. Kernighan and Rob Pike.
*
* Included by permission of the http://tpop.awl.com/ web site,
* which says:
* "You may use this code for any purpose, as long as you leave
* the copyright notice and book citation attached." I have done so.
* @author Brian W. Kernighan and Rob Pike (C++ original)
* @author Ian F. Darwin (translation into Java and removal of I/O)
* @author Ben Ballard (rewrote advQuoted to handle '""' and for readability)
*/
// tag::main[]
// package com.darwinsys.csv;
public class CSVImport implements CSVParser {
public static final char DEFAULT_SEP = ',';
final static Logger log = Logger.getLogger(CSVImport.class.getName());
/** Construct a CSV parser, with the default separator (`,'). */
public CSVImport() {
this(DEFAULT_SEP);
}
/** Construct a CSV parser with a given separator.
* @param sep The single char for the separator (not a list of
* separator characters)
*/
public CSVImport(char sep) {
fieldSep = sep;
}
/** The fields in the current String */
protected List list = new ArrayList<>();
/** the separator char for this parser */
protected char fieldSep;
/** parse: break the input String into fields
* @return java.util.Iterator containing each field
* from the original as a String, in order.
*/
public List parse(String line) {
StringBuffer sb = new StringBuffer();
list.clear(); // recycle to initial state
int i = 0;
if (line.length() == 0) {
list.add(line);
return list;
}
do {
sb.setLength(0);
if (i < line.length() && line.charAt(i) == '"')
i = advQuoted(line, sb, ++i); // skip quote
else
i = advPlain(line, sb, i);
list.add(sb.toString());
log.fine(sb.toString());
i++;
} while (i < line.length());
return list;
}
/** advQuoted: quoted field; return index of next separator
* @param s The input string
* @param sb The output stringbuffer
* @param i the starting position
* @return the next position
*/
protected int advQuoted(String s, StringBuffer sb, int i)
{
int j;
int len= s.length();
for (j=i; j