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The MongoDB Java Driver uber-artifact, containing mongodb-driver, mongodb-driver-core, and bson

There is a newer version: 3.12.14

/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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.
 */

package org.bson.internal;

import org.bson.codecs.Codec;
import org.bson.codecs.configuration.CodecConfigurationException;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import static java.lang.String.format;

final class CodecCache {
    private final ConcurrentMap, Optional>> codecCache =
            new ConcurrentHashMap, Optional>>();

    public boolean containsKey(final Class clazz) {
        return codecCache.containsKey(clazz);
    }

    public void put(final Class clazz, final Codec codec){
        codecCache.put(clazz, Optional.of(codec));
    }

    @SuppressWarnings("unchecked")
    public synchronized  Codec putIfMissing(final Class clazz, final Codec codec){
        if (codecCache.containsKey(clazz)) {
            return (Codec) codecCache.get(clazz).get();
        } else {
            codecCache.put(clazz, Optional.of(codec));
            return codec;
        }
    }

    @SuppressWarnings("unchecked")
    public  Codec getOrThrow(final Class clazz) {
        if (codecCache.containsKey(clazz)) {
            Optional> optionalCodec = codecCache.get(clazz);
            if (!optionalCodec.isEmpty()) {
                return (Codec) optionalCodec.get();
            }
        }
        throw new CodecConfigurationException(format("Can't find a codec for %s.", clazz));
    }
}