forked from External/mage
58 lines
1.6 KiB
Java
58 lines
1.6 KiB
Java
package mage.client.util;
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import static com.google.common.cache.CacheBuilder.newBuilder;
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import java.util.Optional;
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import java.util.concurrent.ExecutionException;
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import com.google.common.base.Function;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.ForwardingLoadingCache;
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import com.google.common.cache.LoadingCache;
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public class SoftValuesLoadingCache<K, V> extends ForwardingLoadingCache<K, Optional<V>> {
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private final LoadingCache<K, Optional<V>> cache;
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public SoftValuesLoadingCache(CacheLoader<K, Optional<V>> loader) {
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cache = newBuilder().softValues().build(loader);
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}
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@Override
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protected LoadingCache<K, Optional<V>> delegate() {
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return cache;
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}
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public V getOrThrow(K key) {
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V v = getOrNull(key);
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if (v == null) {
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throw new NullPointerException();
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}
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return v;
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}
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public V getOrNull(K key) {
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try {
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return get(key).orElse(null);
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} catch (ExecutionException e) {
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throw new RuntimeException(e);
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}
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}
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public V peekIfPresent(K key) {
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Optional<V> value = getIfPresent(key);
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if (value != null) {
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return value.orElse(null);
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}
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return null;
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}
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public static <K, V> SoftValuesLoadingCache<K, V> from(CacheLoader<K, Optional<V>> loader) {
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return new SoftValuesLoadingCache<>(loader);
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}
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public static <K, V> SoftValuesLoadingCache<K, V> from(Function<K, V> loader) {
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return from(CacheLoader.from(k -> Optional.ofNullable(loader.apply(k))));
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}
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}
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