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);
}
}
}