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Extensions to integrate Micronaut and Spring

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/*
 * Copyright 2017-2024 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.annotation;

import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.annotation.Nullable;
import io.micronaut.http.annotation.Header;
import io.micronaut.inject.visitor.VisitorContext;
import io.micronaut.spring.annotation.AbstractSpringAnnotationMapper;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.List;

/**
 * Maps Spring RequestMapping to Micronaut.
 *
 * @author graemerocher
 * @since 1.0
 */
public class RequestHeaderAnnotationMapper extends AbstractSpringAnnotationMapper {
    @Override
    public String getName() {
        return "org.springframework.web.bind.annotation.RequestHeader";
    }

    @Override
    protected List> mapInternal(AnnotationValue annotation, VisitorContext visitorContext) {

        var annotations = new ArrayList>();

        var builder = AnnotationValue.builder(Header.class);
        var name = annotation.stringValue().orElse(annotation.stringValue("name").orElse(null));
        if (name != null) {
            builder.member("value", name);
        }
        annotation.stringValue("defaultValue").ifPresent(defaultValue -> builder.member("defaultValue", defaultValue));
        annotations.add(builder.build());

        var isRequired = annotation.booleanValue("required").orElse(true);
        if (!isRequired) {
            annotations.add(AnnotationValue.builder(Nullable.class).build());
        }

        return annotations;
    }
}