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Extensions to integrate Micronaut and Spring

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/*
 * Copyright 2017-2020 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.spring.web.bind;

import io.micronaut.context.annotation.Requires;
import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.convert.ArgumentConversionContext;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.bind.binders.AnnotatedRequestArgumentBinder;
import jakarta.inject.Singleton;
import org.springframework.web.bind.annotation.RequestAttribute;

import java.util.Optional;

/**
 * Binds request attributes.
 *
 * @author graemerocher
 * @since 1.0
 */
@Singleton
@Requires(classes = RequestAttribute.class)
public class RequestAttributeArgumentBinder implements AnnotatedRequestArgumentBinder {

    @Override
    public Class getAnnotationType() {
        return RequestAttribute.class;
    }

    @Override
    public BindingResult