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Super CSV is a fast, programmer-friendly, free CSV package for Java
/*
* Copyright 2007 Kasper B. Graversen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.supercsv.encoder;
import org.supercsv.prefs.CsvPreference;
import org.supercsv.util.CsvContext;
/**
* The default CsvEncoder implementation.
*
* @author James Bassett
* @since 2.1.0
*/
public class DefaultCsvEncoder implements CsvEncoder {
private final StringBuilder currentColumn = new StringBuilder();
/**
* Constructs a new DefaultCsvEncoder.
*/
public DefaultCsvEncoder() {
}
/**
* {@inheritDoc}
*/
public String encode(final String input, final CsvContext context, final CsvPreference preference) {
currentColumn.delete(0, currentColumn.length()); // reusing builder object
final int delimiter = preference.getDelimiterChar();
final char quote = (char) preference.getQuoteChar();
final String eolSymbols = preference.getEndOfLineSymbols();
final int lastCharIndex = input.length() - 1;
boolean quotesRequiredForSpecialChar = false;
boolean skipNewline = false;
for( int i = 0; i <= lastCharIndex; i++ ) {
final char c = input.charAt(i);
if( skipNewline ) {
skipNewline = false;
if( c == '\n' ) {
continue; // newline following a carriage return is skipped
}
}
if( c == delimiter ) {
quotesRequiredForSpecialChar = true;
currentColumn.append(c);
} else if( c == quote ) {
quotesRequiredForSpecialChar = true;
currentColumn.append(quote);
currentColumn.append(quote);
} else if( c == '\r' ) {
quotesRequiredForSpecialChar = true;
currentColumn.append(eolSymbols);
context.setLineNumber(context.getLineNumber() + 1);
skipNewline = true;
} else if( c == '\n' ) {
quotesRequiredForSpecialChar = true;
currentColumn.append(eolSymbols);
context.setLineNumber(context.getLineNumber() + 1);
} else {
currentColumn.append(c);
}
}
final boolean quotesRequiredForMode = preference.getQuoteMode().quotesRequired(input, context, preference);
final boolean quotesRequiredForSurroundingSpaces = preference.isSurroundingSpacesNeedQuotes()
&& input.length() > 0 && (input.charAt(0) == ' ' || input.charAt(input.length() - 1) == ' ');
if( quotesRequiredForSpecialChar || quotesRequiredForMode || quotesRequiredForSurroundingSpaces ) {
currentColumn.insert(0, quote).append(quote);
}
return currentColumn.toString();
}
}