BlueMap/BlueMapCore/src/main/java/de/bluecolored/bluemap/core/util/Registry.java

85 lines
2.9 KiB
Java

/*
* This file is part of BlueMap, licensed under the MIT License (MIT).
*
* Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
* Copyright (c) contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package de.bluecolored.bluemap.core.util;
import org.jetbrains.annotations.Nullable;
import java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
public class Registry<T extends Keyed> {
private final ConcurrentHashMap<Key, T> entries;
public Registry() {
this.entries = new ConcurrentHashMap<>();
}
@SafeVarargs
public Registry(T... defaultEntires) {
this();
for (T entry : defaultEntires)
register(entry);
}
/**
* Registers a new entry, only if there is no entry with the same key registered already.
* Does nothing otherwise.
* @param entry The new entry to be added to this registry
* @return true if the entry has been added, false if there is already an entry with the same key registered
*/
public boolean register(T entry) {
Objects.requireNonNull(entry, "registry entry can not be null");
return entries.putIfAbsent(entry.getKey(), entry) != null;
}
/**
* Gets an entry from this registry for a key.
* @param key The key to search for
* @return The entry with the key, or null if there is no entry for this key
*/
public @Nullable T get(Key key) {
return entries.get(key);
}
/**
* Returns an unmodifiable set of all keys this registry contains entries for
*/
public Set<Key> keys() {
return Collections.unmodifiableSet(entries.keySet());
}
/**
* Returns an unmodifiable collection of entries in this registry
*/
public Collection<T> values() {
return Collections.unmodifiableCollection(entries.values());
}
}