br.com.objectos.io.flat.Record Maven / Gradle / Ivy

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/*
 * Copyright 2015 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.io.flat;

import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;

import com.google.common.collect.ImmutableList;

/**
 * @author [email protected] (Marcio Endo)
 */
public class Record {

  private final List invalidList;
  private final List providerList;

  private int index;

  private Record(List invalidList, List providerList) {
    this.invalidList = invalidList;
    this.providerList = providerList;
  }

  static Record of(List tokenList) {
    Map> validMap = tokenList.stream()
        .collect(Collectors.groupingBy(Token::valid));

    List invalidList = nullToEmpty(validMap.get(Boolean.FALSE));
    List validList = nullToEmpty(validMap.get(Boolean.TRUE));

    List providerList = validList.stream()
        .filter(Token::keep)
        .collect(Collectors.toList());

    return new Record(invalidList, providerList);
  }

  public  T get() {
    return providerList.get(index++).get();
  }

  public boolean valid() {
    return invalidList.isEmpty();
  }

  public double doubleValue() {
    return providerList.get(index++).doubleValue();
  }

  public int intValue() {
    return providerList.get(index++).intValue();
  }

  public RecordParseException parseException() {
    List errorList = invalidList.stream()
        .map(Token::parseError)
        .filter(Optional::isPresent)
        .map(Optional::get)
        .collect(Collectors.toList());
    return new RecordParseException(errorList);
  }

  private static List nullToEmpty(List list) {
    return list != null ? list : ImmutableList.of();
  }

}