Simple CSV file reader

CSVReader.java

package tv.minato.common.csv

import java.io.BufferedReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class CSVReader implements AutoCloseable {
	private final BufferedReader r;
	private char splitter = ',';
	private char encloser = '\"';
	private String lineSeparator = System.lineSeparator();

	public CSVReader(BufferedReader r){
		this.r = r;
	}

	@Override public void close() throws IOException {
		r.close();
	}

	public CSVReader splitter(char c){
		this.splitter = c;
		return this;
	}

	public CSVReader encloser(char c){
		this.encloser = c;
		return this;
	}

	public CSVReader lineSeparator(String s){
		this.lineSeparator = s;
		return this;
	}

	public List<String> readRow() throws IOException {
		final List<String> row = new ArrayList<>();
		final StringBuilder sb = new StringBuilder();
		boolean enclosed = false;	//囲まれている状態か

		do {
			final String line = r.readLine();

			//終端に達した
			if(line == null){
				if(sb.length() > 0){
					row.add(sb.toString());
					return row;
				}else if(row.size() > 0){
					return row;
				}
				return null;
			}

			//1行文処理する
			char[] buf = line.toCharArray();
			for(int i=0; i<buf.length; i++){
				final char c = buf[i];
				if(c == encloser){
					final boolean isNextQuote = isNextEncloser(buf, i+1);
					if(isNextQuote == true){
						i++;
						sb.append(encloser);
						sb.append(encloser);
					}else{
						enclosed = !enclosed;
					}
				}else if(c == splitter){
					if(enclosed == true){
						sb.append(c);
					}else{
						row.add(sb.toString());
						sb.setLength(0);
					}
				}else{
					sb.append(c);
				}
			}

			//行が終了したが、囲まれている状態
			if(enclosed == true){
				sb.append(lineSeparator);
			}else if(sb.length() > 0){
				row.add(sb.toString());
			}
		}while(enclosed == true);

		return row;
	}

	/**
	 *次の文字がencloserかどうかを判定します。
	 *@param buf 文字のバッファ
	 *@param index 文字の位置
	 *@return encloserかどうか
	 */
	private boolean isNextEncloser(char[] buf, int index){
		return (index == buf.length) ? false : (buf[index] == encloser);
	}
}