com.Ostermiller.util.CSVParse Maven / Gradle / Ivy
/*
* Read files in comma separated value format.
* Copyright (C) 2002-2004 Stephen Ostermiller
* http://ostermiller.org/contact.pl?regarding=Java+Utilities
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* See COPYING.TXT for details.
*/
package com.Ostermiller.util;
import java.io.*;
/**
* Read files in comma separated value format.
* More information about this class is available from ostermiller.org.
* This interface is designed to be set of general methods that all
* CSV parsers should implement.
*
* @author Stephen Ostermiller http://ostermiller.org/contact.pl?regarding=Java+Utilities
* @since ostermillerutils 1.00.00
*/
public interface CSVParse {
/**
* Read the next value from the file. The line number from
* which this value was taken can be obtained from getLastLineNumber().
*
* @return the next value or null if there are no more values.
* @throws IOException if an error occurs while reading.
*
* @since ostermillerutils 1.00.00
*/
public String nextValue() throws IOException;
/**
* Get the line number that the last token came from.
*
* @return line number or -1 if no tokens have been returned yet.
*
* @since ostermillerutils 1.00.00
*/
public int lastLineNumber();
/**
* Get all the values from a line.
*
* If the line has already been partially read, only the
* values that have not already been read will be included.
*
* @return all the values from the line or null if there are no more values.
* @throws IOException if an error occurs while reading.
*
* @since ostermillerutils 1.00.00
*/
public String[] getLine() throws IOException;
/**
* Get the line number that the last token came from.
*
* New line breaks that occur in the middle of a token are not
* counted in the line number count.
*
* @return line number or -1 if no tokens have been returned yet.
*
* @since ostermillerutils 1.00.00
*/
public int getLastLineNumber();
/**
* Get all the values from the file.
*
* If the file has already been partially read, only the
* values that have not already been read will be included.
*
* Each line of the file that has at least one value will be
* represented. Comments and empty lines are ignored.
*
* The resulting double array may be jagged.
*
* @return all the values from the file or null if there are no more values.
* @throws IOException if an error occurs while reading.
*
* @since ostermillerutils 1.00.00
*/
public String[][] getAllValues() throws IOException;
/**
* Change this parser so that it uses a new delimiter.
*
* The initial character is a comma, the delimiter cannot be changed
* to a quote or other character that has special meaning in CSV.
*
* @param newDelim delimiter to which to switch.
* @throws BadDelimiterException if the character cannot be used as a delimiter.
*
* @since ostermillerutils 1.02.08
*/
public void changeDelimiter(char newDelim) throws BadDelimiterException;
/**
* Change this parser so that it uses a new character for quoting.
*
* The initial character is a double quote ("), the delimiter cannot be changed
* to a comma or other character that has special meaning in CSV.
*
* @param newQuote character to use for quoting.
* @throws BadQuoteException if the character cannot be used as a quote.
*
* @since ostermillerutils 1.02.16
*/
public void changeQuote(char newQuote) throws BadQuoteException;
/**
* Close any stream upon which this parser is based.
*
* @since ostermillerutils 1.02.26
* @throws IOException if an error occurs while closing the stream.
*/
public void close() throws IOException;
}