com.fluxtion.compiler.generation.annotationprocessor.ValidateExportFunctionAnnotations Maven / Gradle / Ivy

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package com.fluxtion.compiler.generation.annotationprocessor;

import com.google.auto.service.AutoService;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Processor;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.ExecutableType;
import javax.lang.model.type.TypeKind;
import javax.tools.Diagnostic;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;

@AutoService(Processor.class)
public class ValidateExportFunctionAnnotations extends AbstractProcessor {
    @Override
    public boolean process(Set annotations, RoundEnvironment roundEnv) {
        for (TypeElement annotation : annotations) {
            Set annotatedElements = roundEnv.getElementsAnnotatedWith(annotation);
            Set typeElements = annotatedElements.stream()
                    .filter(element ->
                            {
                                TypeKind returnType = ((ExecutableType) element.asType()).getReturnType().getKind();
                                boolean validReturn = returnType == TypeKind.BOOLEAN || returnType == TypeKind.VOID;
                                return !validReturn || !element.getModifiers().contains(Modifier.PUBLIC);
                            }
                    )
                    .collect(Collectors.toSet());
            typeElements.forEach(element ->
                    processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,
                            "exported method should be public method and a boolean return type ", element));

        }
        return false;
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latestSupported();
    }

    @Override
    public Set getSupportedAnnotationTypes() {
        Set supportedAnnotations = new HashSet<>();
        return supportedAnnotations;
    }
}