OneRowIterator.java

/*
 * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * Additionally licensed with:
 *
 * 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.spf4j.io.csv;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * @author Zoltan Farkas
 */
public final class OneRowIterator implements Iterator<CharSequence> {

  private final CsvReader reader;
  private CsvReader.TokenType next;

  public OneRowIterator(final CsvReader reader) {
    this.reader = reader;
  }

  private CsvReader.TokenType nextToken() {
    try {
      if (next == null) {
        next = reader.next();
      }
      return next;
    } catch (IOException ex) {
      throw new UncheckedIOException(ex);
    } catch (CsvParseException ex) {
      throw new UncheckedCsvParseException(ex);
    }
  }

  @Override
  public boolean hasNext() {
    return nextToken() == CsvReader.TokenType.ELEMENT;
  }

  @Override
  public CharSequence next() {
    if (hasNext()) {
      next = null;
      return reader.getElement();
    } else {
      throw new NoSuchElementException();
    }
  }

  @Override
  public String toString() {
    return "OneRowIterator{" + "reader=" + reader + ", next=" + next + '}';
  }

}