CSVLibUtils.java

package com.akjava.lib.common.csv;

import java.util.List;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.FluentIterable;

public class CSVLibUtils {
private CSVLibUtils(){}

public static class CSVJoiner implements Function<List<String>,String>{
	private Joiner joiner;
	private char separator;
	private char quotechar;
	public CSVJoiner(char separator,char quotechar) {
		super();
		this.separator=separator;
		this.quotechar=quotechar;
		joiner=Joiner.on(separator);
	}
	@Override
	public String apply(List<String> input) {
		List<String> converted=FluentIterable.from(input).transform(new ToCSVString(separator,quotechar,String.valueOf(quotechar)+String.valueOf(quotechar))).toList();
		return joiner.join(converted);
	}
	
}


public static class ToCSVString implements Function<String,String>{
	private char separator;
	private char quote;
	String quoteEscaped;
	public ToCSVString(char separator,char quote,String quoteEscaped) {
		super();
		this.separator = separator;
		this.quote=quote;
		this.quoteEscaped=quoteEscaped;
	}
	@Override
	public String apply(String input) {
		return toCsvString(input,separator,quote,quoteEscaped);
	}
}

public static class ListToArray implements Function<List<String>,String[]>{
	@Override
	public String[] apply(List<String> input) {
		return input.toArray(new String[0]);
	}
}

//quote is fixed
public static String toCsvString(String text,char separator,char quote,String quoteEscaped){
	boolean containLineSeparator=text.indexOf("\n")!=-1 && text.indexOf("\r")!=-1;
	boolean containSeparator=text.indexOf(separator)!=-1;
	
	if(containLineSeparator || containSeparator || text.startsWith(""+quote)){
		text=text.replace(""+quote, quoteEscaped);//escaped
		return quote+text+quote;
	}else{//
		return text;
	}
}
}