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| 1 | +/* |
| 2 | + * Licensed to the Apache Software Foundation (ASF) under one |
| 3 | + * or more contributor license agreements. See the NOTICE file |
| 4 | + * distributed with this work for additional information |
| 5 | + * regarding copyright ownership. The ASF licenses this file |
| 6 | + * to you under the Apache License, Version 2.0 (the |
| 7 | + * "License"); you may not use this file except in compliance |
| 8 | + * with the License. You may obtain a copy of the License at |
| 9 | + * |
| 10 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | + * |
| 12 | + * Unless required by applicable law or agreed to in writing, |
| 13 | + * software distributed under the License is distributed on an |
| 14 | + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | + * KIND, either express or implied. See the License for the |
| 16 | + * specific language governing permissions and limitations |
| 17 | + * under the License. |
| 18 | + */ |
| 19 | +package foo; |
| 20 | + |
| 21 | +import javax.annotation.processing.*; |
| 22 | +import javax.lang.model.SourceVersion; |
| 23 | +import javax.lang.model.element.TypeElement; |
| 24 | +import javax.tools.Diagnostic; |
| 25 | +import javax.tools.JavaFileObject; |
| 26 | + |
| 27 | +import java.io.IOException; |
| 28 | +import java.io.Writer; |
| 29 | +import java.util.Set; |
| 30 | + |
| 31 | +@SupportedSourceVersion(SourceVersion.RELEASE_17) |
| 32 | +@SupportedAnnotationTypes("foo.MyAnnotation") |
| 33 | +public class MyProcessor extends AbstractProcessor { |
| 34 | + |
| 35 | + private int procRun = 0; |
| 36 | + |
| 37 | + @Override |
| 38 | + public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) { |
| 39 | + try { |
| 40 | + generate(annotations, roundEnv); |
| 41 | + } catch (IOException e) { |
| 42 | + throw new RuntimeException(e); |
| 43 | + } |
| 44 | + |
| 45 | + return false; |
| 46 | + } |
| 47 | + |
| 48 | + private void generate(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) throws IOException { |
| 49 | + Messager msg = processingEnv.getMessager(); |
| 50 | + msg.printMessage(Diagnostic.Kind.NOTE, String.format("[%d]: Hello Info", procRun)); |
| 51 | + msg.printMessage(Diagnostic.Kind.WARNING, String.format("[%d]: Hello Warning", procRun)); |
| 52 | + procRun++; |
| 53 | + |
| 54 | + if (procRun > 1) { |
| 55 | + return; |
| 56 | + } |
| 57 | + |
| 58 | + JavaFileObject file = processingEnv.getFiler().createSourceFile("bar.MyGeneratedClass"); |
| 59 | + try (Writer writer = file.openWriter()) { |
| 60 | + writer.write( |
| 61 | + """ |
| 62 | + package bar; |
| 63 | +
|
| 64 | + public class MyGeneratedClass { |
| 65 | + } |
| 66 | + """); |
| 67 | + } |
| 68 | + } |
| 69 | +} |
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