IterableCsvReader.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.EOFException;
import java.util.Iterator;

/**
 *
 * @author Zoltan Farkas
 */
class IterableCsvReader implements CsvReader {

  private CsvReader.TokenType currentToken;
  private CharSequence current;
  private final Iterator<? extends CharSequence> it;
  private boolean finished;

  IterableCsvReader(final Iterator<? extends CharSequence> it) {
    this.it = it;
    current = null;
    finished = false;
    currentToken = TokenType.START_DOCUMENT;
  }

  @Override
  public CsvReader.TokenType next() throws EOFException {
    if (finished) {
      currentToken = CsvReader.TokenType.END_DOCUMENT;
      return currentToken;
    }
    if (it.hasNext()) {
      current = it.next();
      currentToken = CsvReader.TokenType.ELEMENT;
    } else {
      finished = true;
      currentToken = CsvReader.TokenType.END_ROW;
    }
    return currentToken;
  }

  @Override
  public CsvReader.TokenType current() {
    return currentToken;
  }

  @Override
  public CharSequence getElement() {
    if (currentToken != TokenType.ELEMENT) {
      throw new IllegalStateException("Not at a element " + currentToken);
    }
    return current;
  }

  @Override
  public String toString() {
    return "IterableCsvReader{" + "current=" + current + ", it=" + it + ", finished=" + finished + '}';
  }

  @Override
  public long currentLineNumber() {
    return 0;
  }

}