br.com.objectos.flat.FlatReaderIterator Maven / Gradle / Ivy

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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * 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 br.com.objectos.flat;

import static java.util.Spliterator.NONNULL;
import static java.util.Spliterator.ORDERED;

import java.util.Iterator;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

/**
 * @author [email protected] (Marcio Endo)
 */
class FlatReaderIterator implements Iterator {

  private final FlatReader reader;

  private FlatReader next;

  public FlatReaderIterator(FlatReader reader) {
    this.reader = reader;
    next = reader;
  }

  @Override
  public boolean hasNext() {
    if (next != null) {
      return true;
    } else {
      computeNext();
      return next != null;
    }
  }

  @Override
  public FlatReader next() {
    FlatReader res = next;
    next = null;
    return res;
  }

  public Stream stream() {
    Spliterator spliterator = Spliterators.spliteratorUnknownSize(this, ORDERED | NONNULL);
    return StreamSupport.stream(spliterator, false);
  }

  private void computeNext() {
    next = reader.nextLine();
  }

}