Content of file FileEntity.java

/*
 * *********************************************************************************************************************
 *
 * SteelBlue: DCI User Interfaces
 * http://tidalwave.it/projects/steelblue
 *
 * Copyright (C) 2015 - 2023 by Tidalwave s.a.s. (http://tidalwave.it)
 *
 * *********************************************************************************************************************
 *
 * 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.
 *
 * *********************************************************************************************************************
 *
 * git clone https://bitbucket.org/tidalwave/steelblue-src
 * git clone https://github.com/tidalwave-it/steelblue-src
 *
 * *********************************************************************************************************************
 */
package it.tidalwave.role.ui.javafx.example.large.data.impl;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import it.tidalwave.util.As;
import it.tidalwave.util.spi.SimpleFinderSupport;
import it.tidalwave.role.SimpleComposite;
import it.tidalwave.role.ui.Displayable;
import lombok.EqualsAndHashCode;
import lombok.RequiredArgsConstructor;
import lombok.ToString;
import lombok.experimental.Delegate;
import static java.util.stream.Collectors.*;

/***********************************************************************************************************************
 *
 * @author  Fabrizio Giudici
 *
 **********************************************************************************************************************/
@Immutable @EqualsAndHashCode @ToString
public class FileEntity implements As, Displayable
  {
    @RequiredArgsConstructor
    public static class FileEntityFinder extends SimpleFinderSupport<FileEntity>
      {
        @Nonnull
        private final Path path;

        public FileEntityFinder (@Nonnull final FileEntityFinder other, @Nonnull final Object override)
          {
            super(other, override);
            final var source = getSource(FileEntityFinder.class, other, override);
            this.path = source.path;
          }

        @Nonnull @Override
        protected List<FileEntity> computeNeededResults()
          {
            try
              {
                return Files.list(path).sorted(Comparator.comparing(Path::toString)).map(FileEntity::of).collect(toList());
              }
            catch (Exception e)
              {
                System.err.println(e);
                return Collections.emptyList();
it.tidalwave.role.ui.javafx.example.large.data.impl.FileEntity$FileEntityFinder is Serializable; consider declaring a serialVersionUID
 This class implements the Serializable interface, but does
  not define a serialVersionUID field. 
  A change as simple as adding a reference to a .class object
    will add synthetic fields to the class,
   which will unfortunately change the implicit
   serialVersionUID (e.g., adding a reference to String.class
   will generate a static field class$java$lang$String).
   Also, different source code to bytecode compilers may use different
   naming conventions for synthetic variables generated for
   references to class objects or inner classes.
   To ensure interoperability of Serializable across versions,
   consider adding an explicit serialVersionUID.
                // throw new UncheckedIOException(e);
              }
          }
      }

    @Nonnull
    private final Path path;

    @Delegate
    private final As delegate;

    private FileEntity (@Nonnull final Path path)
      {
        this.path = path;
        final List<Object> roles = new ArrayList<>();

        if (Files.isDirectory(path))
          {
            roles.add(SimpleComposite.of(new FileEntityFinder(path)));
          }

        delegate = As.forObject(this, roles);
      }

    @Nonnull
    public static FileEntity of (@Nonnull final Path path)
      {
        return new FileEntity(path);
      }

    @Override @Nonnull
    public String getDisplayName()
      {
        return Optional.ofNullable(path.getFileName()).map(Path::toString).orElse("/");
      }

    @Nonnull
    public ZonedDateTime getCreationDateTime()
            throws IOException
      {
        return toZoneDateTime(getBasicFileAttributes().creationTime());
      }

    @Nonnull
    public ZonedDateTime getLastAccessDateTime()
            throws IOException
      {
        return toZoneDateTime(getBasicFileAttributes().lastAccessTime());
      }

    @Nonnull
    public ZonedDateTime getLastModifiedDateTime()
            throws IOException
      {
        return toZoneDateTime(getBasicFileAttributes().lastModifiedTime());
      }

    @Nonnull
    public long getSize()
            throws IOException
      {
        return Files.size(path);
      }

    @Nonnull
    private BasicFileAttributes getBasicFileAttributes()
            throws IOException
      {
        return Files.getFileAttributeView(path, BasicFileAttributeView.class).readAttributes();
      }

    @Nonnull
    private static ZonedDateTime toZoneDateTime (@Nonnull final FileTime dateTime)
      {
        return ZonedDateTime.ofInstant(dateTime.toInstant(), ZoneId.systemDefault());
      }
  }