org.bson.codecs.pojo.EnumPropertyCodecProvider Maven / Gradle / Ivy

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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.codecs.pojo;

import org.bson.BsonReader;
import org.bson.BsonWriter;
import org.bson.codecs.Codec;
import org.bson.codecs.DecoderContext;
import org.bson.codecs.EncoderContext;
import org.bson.codecs.configuration.CodecConfigurationException;
import org.bson.codecs.configuration.CodecRegistry;


final class EnumPropertyCodecProvider implements PropertyCodecProvider {
    private final CodecRegistry codecRegistry;

    EnumPropertyCodecProvider(final CodecRegistry codecRegistry) {
        this.codecRegistry = codecRegistry;
    }

    @SuppressWarnings({"unchecked", "rawtypes"})
    @Override
    public  Codec get(final TypeWithTypeParameters type, final PropertyCodecRegistry propertyCodecRegistry) {
        Class clazz = type.getType();
        if (Enum.class.isAssignableFrom(clazz)) {
            try {
                return codecRegistry.get(clazz);
            } catch (CodecConfigurationException e) {
                return (Codec) new EnumCodec(clazz);
            }
        }
        return null;
    }

    private static class EnumCodec> implements Codec {
        private final Class clazz;

        EnumCodec(final Class clazz) {
            this.clazz = clazz;
        }

        @Override
        public void encode(final BsonWriter writer, final T value, final EncoderContext encoderContext) {
            writer.writeString(value.name());
        }

        @Override
        public Class getEncoderClass() {
            return clazz;
        }

        @Override
        public T decode(final BsonReader reader, final DecoderContext decoderContext) {
            return Enum.valueOf(clazz, reader.readString());
        }
    }

}