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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of api Show documentation

There is a newer version: 0.5.2

/*
 * 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 java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.Stream;

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

  private final FlatFile file;

  protected AbstractFlatRepo(FlatFile file) {
    this.file = file;
  }

  public final Optional findLast() {
    return file.readerAtLastRecord(recordSize()).map(mapper());
  }

  public final List list() {
    return stream().collect(Collectors.toList());
  }

  public void insert(T instance) {
    file.append(instance);
  }

  public Stream stream() {
    return file.stream().map(mapper());
  }

  protected void deleteUnchecked() {
    file.deleteUnchecked();
  }

  protected abstract FlatMapper mapper();

  protected abstract int recordSize();

}