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CSV parser converts source stream to rows and columns and vice versa

There is a newer version: 1.1

///////////////////////////////////////////////////////////////////////////////////////////////////
// CSV parser converts source stream to rows and columns and vice versa.
// Copyright (C) 2016 Dmitry Shapovalov.
//
// This file is part of CSV parser.
//
// CSV parser is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// CSV parser 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see .
///////////////////////////////////////////////////////////////////////////////////////////////////
package ru.d_shap.csv.handler;

import java.util.ArrayList;
import java.util.List;

/**
 * CSV parser event handler, that accumulates length of each column value in each row.
 *
 * @author Dmitry Shapovalov
 */
public final class ColumnLengthEventHandler implements IParserEventHandler {

    private final List> _rows;

    private List _currentRow;

    /**
     * Create new object.
     */
    public ColumnLengthEventHandler() {
        super();
        _rows = new ArrayList<>();
        _currentRow = null;
    }

    @Override
    public int getMaxColumnLength() {
        return 0;
    }

    @Override
    public boolean checkMaxColumnLength() {
        return false;
    }

    @Override
    public void pushColumn(final String column, final int actualLength) {
        setCurrentRow();
        _currentRow.add(actualLength);
    }

    @Override
    public void pushRow() {
        setCurrentRow();
        _rows.add(_currentRow);
        _currentRow = null;
    }

    private void setCurrentRow() {
        if (_currentRow == null) {
            _currentRow = new ArrayList<>();
        }
    }

    /**
     * Return parse result as list of rows, each row is a list of column lengths.
     *
     * @return parse result.
     */
    public List> getColumnLengths() {
        return _rows;
    }

}