61 lines
1.7 KiB
Java
61 lines
1.7 KiB
Java
package de.bluecolored.bluemap.core.util;
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import org.jetbrains.annotations.Nullable;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Objects;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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public class Registry<T extends Keyed> {
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private final ConcurrentHashMap<Key, T> entries;
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public Registry() {
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this.entries = new ConcurrentHashMap<>();
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}
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@SafeVarargs
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public Registry(T... defaultEntires) {
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this();
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for (T entry : defaultEntires)
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register(entry);
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}
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/**
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* Registers a new entry, only if there is no entry with the same key registered already.
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* Does nothing otherwise.
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* @param entry The new entry to be added to this registry
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* @return true if the entry has been added, false if there is already an entry with the same key registered
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*/
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public boolean register(T entry) {
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Objects.requireNonNull(entry, "registry entry can not be null");
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return entries.putIfAbsent(entry.getKey(), entry) != null;
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}
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/**
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* Gets an entry from this registry for a key.
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* @param key The key to search for
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* @return The entry with the key, or null if there is no entry for this key
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*/
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public @Nullable T get(Key key) {
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return entries.get(key);
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}
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/**
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* Returns an unmodifiable set of all keys this registry contains entries for
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*/
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public Set<Key> keys() {
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return Collections.unmodifiableSet(entries.keySet());
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}
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/**
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* Returns an unmodifiable collection of entries in this registry
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*/
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public Collection<T> values() {
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return Collections.unmodifiableCollection(entries.values());
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}
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}
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