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/*
* Copyright 2014 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.way.gdrive;

import java.util.Iterator;
import java.util.List;

import com.google.common.collect.ImmutableList;

/**
 * @author [email protected] (Mario Marques Junior)
 */
class RequestIterator implements Iterator {

  private final Request request;
  private Iterator iterator;

  public RequestIterator(Request request) {
    this.request = request;
    List execute = request.execute();
    iterator = execute.iterator();
  }

  @Override
  public boolean hasNext() {
    if (!iterator.hasNext()) {
      updateIterator();
    }

    return iterator.hasNext();
  }

  @Override
  public E next() {
    return iterator.next();
  }

  @Override
  public void remove() {
    throw new UnsupportedOperationException();
  }

  private void updateIterator() {
    List itens = getNextPage();
    iterator = itens.iterator();
  }

  private List getNextPage() {
    List res = ImmutableList.of();

    if (request.hasNextPage()) {
      res = request.execute();
    }

    return res;
  }

}