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/*
* Copyright (c) 2017, salesforce.com, inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of conditions and the
* following disclaimer.
*
* 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.
*
* Neither the name of salesforce.com, inc. nor the names of its contributors may be used to endorse or
* promote products derived from this software without specific prior written permission.
*
* 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 OWNER 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 com.sforce.async;
import java.io.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/*
* Copyright, 1999, SALESFORCE.com
*/
/**
* Parse a CSV file into lines of fields.
*/
public class CSVReader {
// During import we replace this char with a space
//private static final char PARSE_FIND = '\u00A0';
private StreamTokenizer parser;
private char[] separators;
private boolean ignoreBlankRecords = true;
private int maxSizeOfIndividualCell = 131072;
private int maxColumnsPerRow = 5000;
private int maxRowSizeInCharacters = 400000; //400K of characters in a row..
//by default, giving a 10m character limit. Note that this limit is in characters. if you want to limit
// by bytes, do it separately.
//Call the mutator to set the limit for following.
private int maxFileSizeInCharacters = 10000000;
private int maxRowsInFile = 10001;
private int fileSizeInCharacters = 0;
private int rowsInFile = 0;
private int maxFieldCount;
boolean atEOF;
public CSVReader(Reader input) {
this(new BufferedReader(input));
}
public CSVReader(Reader input, char customizedSeparator) {
this(new BufferedReader(input), customizedSeparator);
}
public CSVReader(Reader input, char[] customizedSeparators) {
this(new BufferedReader(input), customizedSeparators);
}
public CSVReader(InputStream input) {
this(new InputStreamReader(input));
}
public CSVReader(InputStream input, char customizedSeparator) throws UnsupportedEncodingException {
this(new InputStreamReader(input), customizedSeparator);
}
public CSVReader(InputStream input, char[] customizedSeparators) throws UnsupportedEncodingException {
this(new InputStreamReader(input), customizedSeparators);
}
public CSVReader(InputStream input, String enc) throws UnsupportedEncodingException {
this(new InputStreamReader(input, enc));
}
public CSVReader(InputStream input, String enc, char customizedSeparator) throws UnsupportedEncodingException {
this(new InputStreamReader(input, enc), customizedSeparator);
}
public CSVReader(InputStream input, String enc, char[] customizedSeparators) throws UnsupportedEncodingException {
this(new InputStreamReader(input, enc), customizedSeparators);
}
public CSVReader(BufferedReader input) {
this(input, ',');
}
public CSVReader(BufferedReader input, char customizedSeparator) {
this(input, new char[]{customizedSeparator});
}
public CSVReader(BufferedReader input, char[] customizedSeparators) {
Arrays.sort(customizedSeparators);
this.separators = customizedSeparators;
parser = new StreamTokenizer(input);
parser.ordinaryChars(0, 255);
parser.wordChars(0, 255);
parser.ordinaryChar('\"');
for (char customizedSeparator : customizedSeparators) {
parser.ordinaryChar(customizedSeparator);
}
// Need to do set EOL significance after setting ordinary and word
// chars, and need to explicitly set \n and \r as whitespace chars
// for EOL detection to work
parser.eolIsSignificant(true);
parser.whitespaceChars('\n', '\n');
parser.whitespaceChars('\r', '\r');
atEOF = false;
}
private void checkRecordExceptions(List line) throws IOException {
int rowSizeInCharacters = 0;
if (line != null) {
for (String value : line) {
if (value != null) {
rowSizeInCharacters += value.length();
}
}
if (rowSizeInCharacters > maxRowSizeInCharacters) {
throw new CSVParseException("Exceeded max length for one record: " + rowSizeInCharacters +
". Max length for one record should be less than or equal to " +
maxRowSizeInCharacters, parser.lineno());
}
fileSizeInCharacters += rowSizeInCharacters;
if (fileSizeInCharacters > maxFileSizeInCharacters) {
throw new CSVParseException("Exceeded max file size: " + fileSizeInCharacters +
". Max file size in characters should be less than or equal to " +
maxFileSizeInCharacters, parser.lineno());
}
rowsInFile++;
if (rowsInFile > maxRowsInFile) {
throw new CSVParseException("Exceeded number of records : " + rowsInFile +
". Number of records should be less than or equal to " + maxRowsInFile,
parser.lineno());
}
}
}
public ArrayList nextRecord() throws IOException {
ArrayList record = nextRecordLocal();
if (ignoreBlankRecords) {
while(record != null) {
boolean emptyLine = false;
if (record.size() == 0) {
emptyLine = true;
} else if (record.size() == 1) {
String val = record.get(0);
if (val == null || val.length() == 0) {
emptyLine = true;
}
}
if (emptyLine) {
record = nextRecordLocal();
} else {
break;
}
}
}
checkRecordExceptions(record);
return record;
}
private ArrayList nextRecordLocal() throws IOException {
if (atEOF) {
return null;
}
ArrayList record = new ArrayList(maxFieldCount);
StringBuilder fieldValue = null;
while(true) {
int token = parser.nextToken();
if (token == StreamTokenizer.TT_EOF) {
addField(record, fieldValue);
atEOF = true;
break;
}
if (token == StreamTokenizer.TT_EOL) {
addField(record, fieldValue);
break;
}
if (token == StreamTokenizer.TT_WORD) {
if (fieldValue != null) {
throw new CSVParseException(String.format("Unknown error, near %s", fieldValue), parser.lineno());
}
fieldValue = new StringBuilder(parser.sval);
continue;
}
if (Arrays.binarySearch(separators, (char)token) >= 0) {
addField(record, fieldValue);
fieldValue = null;
continue;
}
if (token == '"') {
if (fieldValue != null) {
throw new CSVParseException("Found unescaped quote. A value with quote should be within a quote",
parser.lineno());
}
while(true) {
token = parser.nextToken();
if (token == StreamTokenizer.TT_EOF) {
atEOF = true;
throw new CSVParseException("EOF reached before closing an opened quote", parser.lineno());
}
if (token == StreamTokenizer.TT_EOL) {
fieldValue = appendFieldValue(fieldValue, "\n");
continue;
}
if (token == StreamTokenizer.TT_WORD) {
fieldValue = appendFieldValue(fieldValue, parser.sval);
continue;
}
if (Arrays.binarySearch(separators, (char)token) >= 0) {
fieldValue = appendFieldValue(fieldValue, token);
continue;
}
if (token == '"') {
int nextToken = parser.nextToken();
if (nextToken == '"') {
//escaped quote
fieldValue = appendFieldValue(fieldValue, nextToken);
continue;
}
if (nextToken == StreamTokenizer.TT_WORD) {
throw new CSVParseException("Not expecting more text after end quote", parser.lineno());
} else {
parser.pushBack();
break;
}
}
}
}
}
if (record.size() > maxFieldCount) {
maxFieldCount = record.size();
}
return record;
}
private StringBuilder appendFieldValue(StringBuilder fieldValue, int token) throws CSVParseException {
return appendFieldValue(fieldValue, ""+(char)token);
}
private StringBuilder appendFieldValue(StringBuilder fieldValue, String token) throws CSVParseException {
if (fieldValue == null) {
fieldValue = new StringBuilder();
}
fieldValue.append(token);
if (token.length() > maxSizeOfIndividualCell) {
throw new CSVParseException("Exceeded max field size: " + token.length(), parser.lineno());
}
return fieldValue;
}
private void addField(ArrayList record, StringBuilder fieldValue) throws CSVParseException {
record.add(fieldValue == null ? null : fieldValue.toString());
if (record.size() > maxColumnsPerRow) {
throw new CSVParseException("Exceeded max number of columns per record : " + maxColumnsPerRow,
parser.lineno());
}
}
public int getMaxRowsInFile() {
return this.maxRowsInFile;
}
public void setMaxRowsInFile(int newMax) {
this.maxRowsInFile = newMax;
}
public void setMaxCharsInFile(int newMax) {
this.maxFileSizeInCharacters = newMax;
}
//*****************
// Excption classes
//*****************
public static class CSVParseException extends IOException {
final int recordNumber;
CSVParseException(String message, int lineno) {
super(message);
recordNumber = lineno;
}
CSVParseException(int i) {
recordNumber = i;
}
public int getRecordNumber() {
return recordNumber;
}
}
}
