io.micronaut.annotation.processing.visitor.JavaMethodElement Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of micronaut-inject-java Show documentation
Natively Cloud Native
There is a newer version: 4.7.9
Show newest version
/*
 * Copyright 2017-2019 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
 *
 * http://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.annotation.processing.visitor;

import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.inject.ast.ClassElement;
import io.micronaut.inject.ast.MethodElement;
import io.micronaut.inject.ast.ParameterElement;

import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;
import java.util.List;
import java.util.Optional;
import java.util.function.Function;

/**
 * A method element returning data from a {@link ExecutableElement}.
 *
 * @author James Kleeh
 * @since 1.0
 */
class JavaMethodElement extends AbstractJavaElement implements MethodElement {

    private final ExecutableElement executableElement;
    private final JavaVisitorContext visitorContext;

    /**
     * @param executableElement  The {@link ExecutableElement}
     * @param annotationMetadata The annotation metadata
     * @param visitorContext The visitor context
     */
    JavaMethodElement(
            ExecutableElement executableElement,
            AnnotationMetadata annotationMetadata,
            JavaVisitorContext visitorContext) {
        super(executableElement, annotationMetadata);
        this.executableElement = executableElement;
        this.visitorContext = visitorContext;
    }

    @Override
    public Optional getDocumentation() {
        return Optional.ofNullable(visitorContext.getElements().getDocComment(executableElement));
    }

    @Override
    public ClassElement getReturnType() {
        TypeMirror returnType = executableElement.getReturnType();
        return mirrorToClassElement(returnType, visitorContext);
    }

    @Override
    public ParameterElement[] getParameters() {
        List parameters = executableElement.getParameters();
        return parameters.stream().map((Function) variableElement ->
                new JavaParameterElement(variableElement, visitorContext.getAnnotationUtils().getAnnotationMetadata(variableElement), visitorContext)
        ).toArray(ParameterElement[]::new);
    }

    @Override
    public ClassElement getDeclaringType() {
        final Element enclosingElement = executableElement.getEnclosingElement();
        if (!(enclosingElement instanceof TypeElement)) {
            throw new IllegalStateException("Enclosing element should be a type element");
        }
        return new JavaClassElement(
                (TypeElement) enclosingElement,
                visitorContext.getAnnotationUtils().getAnnotationMetadata(enclosingElement),
                visitorContext
        );
    }
}