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Core components supporting the Micronaut Framework

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/*
 * Copyright 2017-2022 original authors
 *
 * 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
 *
 * https://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 io.micronaut.buffer.netty;

import io.micronaut.core.annotation.Internal;
import io.micronaut.core.convert.MutableConversionService;
import io.micronaut.core.convert.TypeConverterRegistrar;
import io.micronaut.core.io.buffer.ByteBuffer;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.CompositeByteBuf;
import io.netty.buffer.Unpooled;

import java.util.Optional;

/**
 * Factory for {@link ByteBuf} and {@link NettyByteBuffer} related converters.
 *
 * @author Denis Stepanov
 * @since 4.6
 */
@Internal
public final class NettyByteBufferConverters implements TypeConverterRegistrar {
    @Override
    public void register(MutableConversionService conversionService) {

        conversionService.addConverter(
            NettyByteBuffer.class,
            ByteBuf.class,
            NettyByteBuffer::asNativeBuffer
        );

        conversionService.addConverter(
            ByteBuf.class,
            ByteBuffer.class,
            NettyByteBuffer::new
        );

        conversionService.addConverter(
            java.nio.ByteBuffer.class,
            ByteBuf.class,
            nioBuffer -> Unpooled.copiedBuffer(nioBuffer)
        );

        conversionService.addConverter(
            ByteBuf.class,
            CharSequence.class,
            (byteBuf, target, context) -> Optional.of(byteBuf.toString(context.getCharset()))
        );

        conversionService.addConverter(
            ByteBuf.class,
            String.class,
            (byteBuf, target, context) -> Optional.of(byteBuf.toString(context.getCharset()))
        );

        conversionService.addConverter(
            CompositeByteBuf.class,
            CharSequence.class,
            (object, targetType, context) -> Optional.of(object.toString(context.getCharset()))
        );

        conversionService.addConverter(
            ByteBuf.class,
            byte[].class,
            byteBuf -> ByteBufUtil.getBytes(byteBuf)
        );

        conversionService.addConverter(
            byte[].class,
            ByteBuf.class,
            array -> Unpooled.wrappedBuffer(array)
        );
    }

}