1 /* 2 * * Copyright 2022 Google LLC. All rights reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the License); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package kapt; 18 19 import static java.nio.charset.StandardCharsets.UTF_8; 20 21 import com.google.auto.service.AutoService; 22 import java.io.IOException; 23 import java.io.OutputStream; 24 import java.io.UncheckedIOException; 25 import java.util.Set; 26 import javax.annotation.processing.AbstractProcessor; 27 import javax.annotation.processing.ProcessingEnvironment; 28 import javax.annotation.processing.Processor; 29 import javax.annotation.processing.RoundEnvironment; 30 import javax.annotation.processing.SupportedAnnotationTypes; 31 import javax.lang.model.SourceVersion; 32 import javax.lang.model.element.Element; 33 import javax.lang.model.element.TypeElement; 34 35 /** Simple test processor that numbered classes in rounds as specified in {@link Count}. */ 36 @AutoService(Processor.class) 37 @SupportedAnnotationTypes("*") 38 public class AP extends AbstractProcessor { 39 40 private volatile String prefix = ""; 41 42 @Override init(ProcessingEnvironment processingEnv)43 public synchronized void init(ProcessingEnvironment processingEnv) { 44 super.init(processingEnv); 45 prefix = processingEnv.getOptions().getOrDefault("kapt.AP.indexPrefix", ""); 46 } 47 48 @Override getSupportedSourceVersion()49 public SourceVersion getSupportedSourceVersion() { 50 return SourceVersion.latestSupported(); 51 } 52 53 @Override process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv)54 public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) { 55 for (Element element : roundEnv.getElementsAnnotatedWith(Count.class)) { 56 Count c = element.getAnnotation(Count.class); 57 if (c.value() > 0) { 58 int next = c.value() - 1; 59 String simpleName = element.getSimpleName() + "_" + prefix + next; 60 try (OutputStream os = 61 processingEnv 62 .getFiler() 63 .createSourceFile("kapt." + simpleName, element) 64 .openOutputStream()) { 65 os.write( 66 String.format("package kapt; @Count(%d) public class %s {}", next, simpleName) 67 .getBytes(UTF_8)); 68 } catch (IOException e) { 69 throw new UncheckedIOException(e); 70 } 71 } 72 } 73 return false; 74 } 75 } 76