/**
* Copyright (c) 2012-2017, jcabi.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the jcabi.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcabi.aspects.apt;
import java.util.Set;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeKind;
import javax.tools.Diagnostic;
/**
* Annotation processor that checks whether methods annotated with
* {@link com.jcabi.aspects.Quietly} have void return types.
*
* @author Carlos Miranda (miranda.cma@gmail.com)
* @version $Id: 4d868f8361e9b6cdfe77a705c73ca929bb46a553 $
*/
@SupportedAnnotationTypes("com.jcabi.aspects.Quietly")
public final class QuietlyReturnTypeProcessor extends AbstractProcessor {
@Override
public boolean process(final Set<? extends TypeElement> annotations,
final RoundEnvironment env) {
for (final TypeElement type : annotations) {
this.checkMethods(env, type);
}
return true;
}
/**
* Check methods annotated with {@link com.jcabi.aspects.Quietly}.
* @param env The environment.
* @param type The annotation type.
*/
private void checkMethods(final RoundEnvironment env,
final TypeElement type) {
for (final Element element: env.getElementsAnnotatedWith(type)) {
if (element.getKind() == ElementKind.METHOD) {
final ExecutableElement method = (ExecutableElement) element;
if (!method.getReturnType().getKind().equals(TypeKind.VOID)) {
this.processingEnv.getMessager().printMessage(
Diagnostic.Kind.ERROR,
String.format(
// @checkstyle LineLength (1 line)
"Method '%s.%s' annotated with @Quietly does not return void",
method.getEnclosingElement().getSimpleName(),
method.getSimpleName()
)
);
}
}
}
}
}