FilesystemBasedRestartImpl.java

/*
 * This file is part of Waarp Project (named also Waarp or GG).
 *
 *  Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
 *  tags. See the COPYRIGHT.txt in the distribution for a full listing of
 * individual contributors.
 *
 *  All Waarp Project 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.
 *
 * Waarp 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
 * Waarp . If not, see <http://www.gnu.org/licenses/>.
 */
package org.waarp.common.file.filesystembased;

import org.waarp.common.exception.NoRestartException;
import org.waarp.common.file.Restart;
import org.waarp.common.file.SessionInterface;

/**
 * Restart implementation for Filesystem Based
 */
public abstract class FilesystemBasedRestartImpl extends Restart {
  /**
   * Valid Position for the next current file
   */
  protected long position = -1;
  protected int limit = -1;

  /**
   * @param session
   */
  protected FilesystemBasedRestartImpl(final SessionInterface session) {
    super(session);
  }

  @Override
  public final long getPosition() throws NoRestartException {
    if (isSet()) {
      setSet(false);
      return position;
    }
    throw new NoRestartException("Restart is not set");
  }

  @Override
  public final int getMaxSize(int nextBlock) {
    if (limit > 0) {
      if (nextBlock > limit) {
        nextBlock = limit;
      }
      limit -= nextBlock;
      return nextBlock;
    } else if (limit == 0) {
      limit = -1;
      return 0;
    }
    return nextBlock;
  }

  @Override
  public final void setSet(final boolean isSet) {
    super.setSet(isSet);
    limit = -1;
  }

}