io.micronaut.inject.qualifiers.InterceptorBindingQualifier Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2017-2021 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.inject.qualifiers;

import io.micronaut.context.Qualifier;
import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.annotation.AnnotationUtil;
import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.annotation.Internal;
import io.micronaut.inject.BeanType;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Qualifier used to resolve the interceptor binding when injection method interceptors for AOP.
 *
 * @param  The bean type
 * @author graemerocher
 * @since 2.4.0
 */
@Internal
public final class InterceptorBindingQualifier implements Qualifier {

    private final Set supportedAnnotationNames;
    private final Set> supportedInterceptorTypes;

    InterceptorBindingQualifier(AnnotationMetadata annotationMetadata) {
        final List> annotationValues = annotationMetadata
                .findAnnotation(AnnotationUtil.ANN_INTERCEPTOR_BINDING_QUALIFIER)
                .map(av -> av.getAnnotations(AnnotationMetadata.VALUE_MEMBER))
                .orElse(Collections.emptyList());
        this.supportedAnnotationNames = annotationValues
                .stream()
                .flatMap(av -> av.stringValue().map(Stream::of).orElse(Stream.empty()))
                .collect(Collectors.toSet());
        this.supportedInterceptorTypes = annotationValues
                .stream()
                .flatMap(av -> av.classValue("interceptorType").map(Stream::of).orElse(Stream.empty()))
                .collect(Collectors.toSet());
    }

    @Override
    public > Stream reduce(Class beanType, Stream candidates) {
        return candidates.filter(candidate -> {
            if (supportedInterceptorTypes.contains(candidate.getBeanType())) {
                return true;
            }
            List annotationNames = new ArrayList<>(resolveInterceptorValues(candidate.getAnnotationMetadata()));
            annotationNames.retainAll(supportedAnnotationNames);
            return !annotationNames.isEmpty();
        });
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        InterceptorBindingQualifier that = (InterceptorBindingQualifier) o;
        return supportedAnnotationNames.equals(that.supportedAnnotationNames) && supportedInterceptorTypes.equals(that.supportedInterceptorTypes);
    }

    @Override
    public int hashCode() {
        return Objects.hash(supportedAnnotationNames, supportedInterceptorTypes);
    }

    public static List resolveInterceptorValues(AnnotationMetadata annotationMetadata) {
        AnnotationValue bindings = annotationMetadata
                .getAnnotation(AnnotationUtil.ANN_INTERCEPTOR_BINDINGS);
        if (bindings != null) {
            return bindings.getAnnotations(AnnotationMetadata.VALUE_MEMBER)
                    .stream()
                    .map(AnnotationValue::stringValue)
                    .filter(Optional::isPresent)
                    .map(Optional::get)
                    .collect(Collectors.toList());
        } else {
            return Collections.emptyList();
        }
    }
}