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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.annotation;

import io.micronaut.core.annotation.AnnotationUtil;
import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.annotation.AnnotationValueBuilder;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.bind.annotation.Bindable;
import io.micronaut.core.util.StringUtils;
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;

/**
 * Abstract web binding impl.
 *
 * @author graemerocher
 * @since 1.0
 * @param  The target annotation type
 */
public abstract class WebBindAnnotationMapper extends AbstractSpringAnnotationMapper {

    /**
     * The annotation type.
     * @return The type
     */
    abstract @NonNull Class annotationType();

    @Override
    protected List> mapInternal(AnnotationValue annotation, VisitorContext visitorContext) {
        List> mappedAnnotations = new ArrayList<>();

        final String name = annotation.stringValue().orElseGet(() -> annotation.stringValue("name").orElse(null));
        final String defaultValue = annotation.stringValue("defaultValue").orElse(null);
        final boolean required = annotation.booleanValue("required").orElse(true);

        final AnnotationValueBuilder builder = AnnotationValue.builder(annotationType());
        final AnnotationValueBuilder bindableBuilder = AnnotationValue.builder(Bindable.class);
        if (StringUtils.isNotEmpty(name)) {
            builder.value(name);
            bindableBuilder.value(name);
        }
        if (StringUtils.isNotEmpty(defaultValue)) {
            builder.member("defaultValue", name);
            bindableBuilder.member("defaultValue", defaultValue);
        }

        mappedAnnotations.add(builder.build());
        mappedAnnotations.add(bindableBuilder.build());
        if (!required) {
            mappedAnnotations.add(AnnotationValue.builder(AnnotationUtil.NULLABLE).build());
        }

        return mappedAnnotations;
    }

}