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Spring Boot Owncloud Service and Authentication Provider

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/*-
 * #%L
 * owncloud-spring-boot-starter
 * %%
 * Copyright (C) 2016 - 2017 by the original Authors
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 General Public
 * License along with this program.  If not, see
 * .
 * #L%
 */
package software.coolstuff.springframework.owncloud.service.impl.local;

import lombok.*;
import lombok.extern.slf4j.Slf4j;
import software.coolstuff.springframework.owncloud.exception.resource.OwncloudLocalResourceException;
import software.coolstuff.springframework.owncloud.model.OwncloudQuota;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

/**
 * @author mufasa1976
 */
@Data
@Getter(AccessLevel.NONE)
@ToString(exclude = "location")
@Builder
@Slf4j
class OwncloudLocalQuotaImpl implements OwncloudQuota, Cloneable {
  @Getter
  private final String username;
  private final Path location;
  private Long total;
  @Getter
  @Setter
  @Builder.Default
  private long used = 0;

  @Override
  public long getTotal() {
    if (total == null) {
      return getFreeSpaceOfLocation();
    }
    if (used > total) {
      return used;
    }
    return total;
  }

  private long getFreeSpaceOfLocation() {
    try {
      return Files.getFileStore(location).getUsableSpace();
    } catch (IOException e) {
      String logMessage = "Error while getting the free Space of the Path " + location.toAbsolutePath().normalize().toString();
      log.error(logMessage);
      throw new OwncloudLocalResourceException(logMessage, e);
    }
  }

  public synchronized void increaseUsed(long size) {
    used += size;
  }

  public synchronized void reduceUsed(long size) {
    used -= size;
  }

  @Override
  public long getFree() {
    long free = getTotal() - used;
    return free > 0 ? free : 0;
  }

  @Override
  public float getRelative() {
    return (float) used * 100f / (float) getTotal();
  }

}