FileSystemMediaFolderFinder.java
- /*
- * *********************************************************************************************************************
- *
- * blueMarine II: Semantic Media Centre
- * http://tidalwave.it/projects/bluemarine2
- *
- * Copyright (C) 2015 - 2021 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/bluemarine2-src
- * git clone https://github.com/tidalwave-it/bluemarine2-src
- *
- * *********************************************************************************************************************
- */
- package it.tidalwave.bluemarine2.model.impl;
- import javax.annotation.Nonnegative;
- import javax.annotation.Nonnull;
- import java.io.IOException;
- import java.nio.file.DirectoryStream;
- import java.nio.file.Files;
- import java.nio.file.Path;
- import java.util.List;
- import java.util.function.Function;
- import java.util.function.Predicate;
- import java.util.stream.Stream;
- import java.util.stream.StreamSupport;
- import it.tidalwave.util.spi.FinderSupport;
- import it.tidalwave.bluemarine2.model.spi.PathAwareEntity;
- import it.tidalwave.bluemarine2.model.spi.PathAwareFinder;
- import lombok.RequiredArgsConstructor;
- import lombok.extern.slf4j.Slf4j;
- import static java.util.stream.Collectors.*;
- /***********************************************************************************************************************
- *
- * An {@link PathAwareFinder} for retrieving children of a {@link FileSystemMediaFolder}.
- *
- * @stereotype Finder
- *
- * @author Fabrizio Giudici
- *
- **********************************************************************************************************************/
- @RequiredArgsConstructor @Slf4j
- public class FileSystemMediaFolderFinder extends FinderSupport<PathAwareEntity, PathAwareFinder> implements PathAwareFinder
- {
- private static final long serialVersionUID = 7656309392185783930L;
- @Nonnull
- private final FileSystemMediaFolder mediaFolder;
- @Nonnull
- private final Path basePath;
- // FIXME: implement a better filter looking at the file name suffix
- private final Predicate<? super Path> fileFilter = path -> !path.toFile().getName().equals(".DS_Store");
- public FileSystemMediaFolderFinder (@Nonnull final FileSystemMediaFolderFinder other, @Nonnull final Object override)
- {
- super(other, override);
- final FileSystemMediaFolderFinder source = getSource(FileSystemMediaFolderFinder.class, other, override);
- this.mediaFolder = source.mediaFolder;
- this.basePath = source.basePath;
- }
- @Override @Nonnegative
- public int count()
- {
- return evaluateDirectoryStream(stream -> stream.filter(fileFilter).count()).intValue();
- }
- @Override @Nonnull
- public PathAwareFinder withPath (@Nonnull final Path path)
- {
- throw new UnsupportedOperationException("Not supported yet."); // TODO
- }
- @Override @Nonnull
- protected List<? extends PathAwareEntity> computeResults()
- {
- return evaluateDirectoryStream(stream -> stream
- .filter(fileFilter)
- .map(child -> Files.isDirectory(child)
- ? new FileSystemMediaFolder(child, mediaFolder, basePath)
- : new FileSystemAudioFile(child, mediaFolder, basePath))
- .collect(toList()));
- }
- private <T> T evaluateDirectoryStream (@Nonnull final Function<Stream<Path>, T> function)
- {
- if (!Files.exists(mediaFolder.getPath()))
- {
- return function.apply(Stream.of());
- }
- try (final DirectoryStream<Path> stream = Files.newDirectoryStream(mediaFolder.getPath()))
- {
- return function.apply(StreamSupport.stream(stream.spliterator(), false));
- }
- catch (IOException e)
- {
- log.error("", e);
- throw new RuntimeException(e);
- }
- }
- }