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/*
 * 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.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.CodecRegistry;

import java.lang.reflect.Type;
import java.util.List;

class LazyCodec implements Codec {
    private final CodecRegistry registry;
    private final Class clazz;
    private final List types;
    private volatile Codec wrapped;

    LazyCodec(final CodecRegistry registry, final Class clazz, final List types) {
        this.registry = registry;
        this.clazz = clazz;
        this.types = types;
    }

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

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

    @Override
    public T decode(final BsonReader reader, final DecoderContext decoderContext) {
        return getWrapped().decode(reader, decoderContext);
    }

    private Codec getWrapped() {
        if (wrapped == null) {
            if (types == null) {
                wrapped = registry.get(clazz);
            } else {
                wrapped = registry.get(clazz, types);
            }
        }

        return wrapped;
    }
}