ch.rasc.constgen.ConstAnnotationProcessor.java Source code

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Here is the source code for ch.rasc.constgen.ConstAnnotationProcessor.java

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/**
 * Copyright 2015-2016 Ralph Schaer <ralphschaer@gmail.com>
 *
 * 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 ch.rasc.constgen;

import java.io.Writer;
import java.util.Set;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Processor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import javax.tools.JavaFileObject;

import com.google.auto.service.AutoService;

@SupportedAnnotationTypes({ "org.springframework.data.mongodb.core.mapping.Document",
        "org.mongodb.morphia.annotations.Entity", "ch.rasc.bsoncodec.annotation.BsonDocument" })
@SupportedSourceVersion(SourceVersion.RELEASE_8)
@AutoService(Processor.class)
public class ConstAnnotationProcessor extends AbstractProcessor {

    private static final boolean ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS = false;

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {

        this.processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE,
                "Running " + getClass().getSimpleName());

        if (roundEnv.processingOver() || annotations.size() == 0) {
            return ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS;
        }

        if (roundEnv.getRootElements() == null || roundEnv.getRootElements().isEmpty()) {
            this.processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "No sources to process");
            return ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS;
        }

        for (TypeElement annotation : annotations) {
            Set<? extends Element> elements = roundEnv.getElementsAnnotatedWith(annotation);
            boolean bsoncodecProject = annotation.getQualifiedName()
                    .contentEquals("ch.rasc.bsoncodec.annotation.BsonDocument");
            for (Element element : elements) {

                try {
                    TypeElement typeElement = (TypeElement) element;

                    CodeGenerator codeGen = new CodeGenerator(typeElement, this.processingEnv.getElementUtils(),
                            bsoncodecProject);

                    JavaFileObject jfo = this.processingEnv.getFiler()
                            .createSourceFile(codeGen.getPackageName() + "." + codeGen.getClassName());
                    try (Writer writer = jfo.openWriter()) {
                        codeGen.generate(writer);
                    }

                } catch (Exception e) {
                    this.processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, e.getMessage());
                }

            }
        }

        return ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS;
    }

}