MetadataSupport.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.spi;
- import javax.annotation.Nonnull;
- import javax.annotation.Nullable;
- import java.util.Collections;
- import java.util.HashMap;
- import java.util.Map;
- import java.util.Optional;
- import java.util.Set;
- import java.nio.file.Path;
- import it.tidalwave.util.Key;
- import it.tidalwave.bluemarine2.model.MediaItem;
- import java.util.function.Function;
- import lombok.Getter;
- import lombok.RequiredArgsConstructor;
- import lombok.ToString;
- import lombok.extern.slf4j.Slf4j;
- /***********************************************************************************************************************
- *
- * @author Fabrizio Giudici
- *
- **********************************************************************************************************************/
- @RequiredArgsConstructor @ToString(of = "properties") @Slf4j
- public class MetadataSupport implements MediaItem.Metadata
- {
- @Getter @Nonnull
- protected final Path path;
- @Nonnull
- protected Optional<Function<Key<?>, MediaItem.Metadata>> fallback;
- protected final Map<Key<?>, Object> properties = new HashMap<>();
- /*******************************************************************************************************************
- *
- *
- *
- ******************************************************************************************************************/
- public MetadataSupport (@Nonnull final Path path)
- {
- this(path, Optional.empty());
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public <T> Optional<T> get (@Nonnull final Key<T> key)
- {
- return properties.containsKey(key) ? Optional.ofNullable((T)properties.get(key))
- : fallback.flatMap(fb -> fb.apply(key).get(key));
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public <T> T getAll (@Nonnull final Key<T> key)
- {
- final T list = (T)properties.get(key);
- return (list != null) ? list :
- fallback.flatMap(fb -> fb.apply(key).get(key)).orElse((T)Collections.emptyList());
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override
- public boolean containsKey (@Nonnull final Key<?> key)
- {
- return properties.containsKey(key);
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public Set<Key<?>> getKeys()
- {
- return Collections.unmodifiableSet(properties.keySet());
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public Set<Map.Entry<Key<?>, ?>> getEntries()
- {
- return Collections.unmodifiableSet(properties.entrySet());
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public <T> MediaItem.Metadata with (@Nonnull final Key<T> key, @Nonnull final T value)
- {
- final MetadataSupport clone = new MetadataSupport(path, fallback);
- clone.properties.putAll(this.properties);
- clone.put(key, value);
- if (value instanceof ITunesComment)
- {
- clone.put(CDDB, ((ITunesComment) value).getCddb());
- }
- return clone;
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public MediaItem.Metadata withFallback (@Nonnull final Function<Key<?>, MediaItem.Metadata> fallback)
- {
- final MetadataSupport clone = new MetadataSupport(path, Optional.of(fallback));
- clone.properties.putAll(this.properties);
- return clone;
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public <T> MediaItem.Metadata with (@Nonnull final Key<T> key, @Nonnull final Optional<T> value)
- {
- return value.map(t -> with(key, t)).orElse(this);
- }
- /*******************************************************************************************************************
- *
- * FIXME: remove this, make it truly immutable.
- *
- ******************************************************************************************************************/
- protected <V> void put (@Nonnull final Key<V> key, @Nullable final V value)
- {
- if (value != null)
- {
- properties.put(key, value);
- }
- }
- }