MapAggregate.java
- /*
- * *********************************************************************************************************************
- *
- * TheseFoolishThings: Miscellaneous utilities
- * http://tidalwave.it/projects/thesefoolishthings
- *
- * Copyright (C) 2009 - 2024 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/thesefoolishthings-src
- * git clone https://github.com/tidalwave-it/thesefoolishthings-src
- *
- * *********************************************************************************************************************
- */
- package it.tidalwave.role.impl;
- import javax.annotation.Nonnull;
- import javax.annotation.concurrent.Immutable;
- import java.util.Collections;
- import java.util.HashMap;
- import java.util.Map;
- import java.util.Optional;
- import java.util.Set;
- import java.util.concurrent.CopyOnWriteArraySet;
- import it.tidalwave.role.Aggregate;
- import lombok.ToString;
- /***********************************************************************************************************************
- *
- * A map-based implementation of {@link Aggregate}.
- * This is no more a public class; use {@link Aggregate#of(String, Object)} instead.
- * @stereotype Role
- *
- * @param <T> the type of the aggregate
- *
- * @author Fabrizio Giudici
- *
- **********************************************************************************************************************/
- @Immutable @ToString
- public class MapAggregate<T> implements Aggregate<T>
- {
- private final Map<String, T> mapByName;
- /*******************************************************************************************************************
- *
- *
- ******************************************************************************************************************/
- public MapAggregate()
- {
- this.mapByName = Collections.emptyMap();
- }
- /*******************************************************************************************************************
- *
- *
- ******************************************************************************************************************/
- public MapAggregate (@Nonnull final Map<String, T> mapByName)
- {
- this.mapByName = Map.copyOf(mapByName);
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public Optional<T> getByName (@Nonnull final String name)
- {
- return Optional.ofNullable(mapByName.get(name));
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public Set<String> getNames()
- {
- return new CopyOnWriteArraySet<>(mapByName.keySet());
- }
- /*******************************************************************************************************************
- *
- * {@inheritDoc}
- *
- ******************************************************************************************************************/
- @Override @Nonnull
- public Aggregate<T> with (@Nonnull final String name, @Nonnull final T object)
- {
- final Map<String, T> clone = new HashMap<>(mapByName);
- clone.put(name, object);
- return new MapAggregate<>(clone);
- }
- }