1 /* 2 * Copyright 2017 Google Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import static java.util.stream.Collectors.joining; 25 26 import java.lang.annotation.ElementType; 27 import java.lang.annotation.Retention; 28 import java.lang.annotation.RetentionPolicy; 29 import java.lang.annotation.Target; 30 import java.util.Arrays; 31 import java.util.List; 32 import java.util.Set; 33 import javax.annotation.processing.RoundEnvironment; 34 import javax.annotation.processing.SupportedAnnotationTypes; 35 import javax.lang.model.element.Element; 36 import javax.lang.model.element.ExecutableElement; 37 import javax.lang.model.element.VariableElement; 38 import javax.lang.model.element.TypeElement; 39 import javax.tools.Diagnostic.Kind; 40 41 @SupportedAnnotationTypes("MethodParameterProcessor.ParameterNames") 42 public class MethodParameterProcessor extends JavacTestingAbstractProcessor { 43 44 @Retention(RetentionPolicy.RUNTIME) 45 @Target({ElementType.METHOD, ElementType.CONSTRUCTOR}) 46 @interface ParameterNames { value()47 String[] value() default {}; 48 } 49 50 @Override process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv)51 public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) { 52 for (Element element : roundEnv.getElementsAnnotatedWith(ParameterNames.class)) { 53 ExecutableElement exec = (ExecutableElement)element; 54 String message = printNamesAndAnnotations(exec); 55 messager.printMessage(Kind.NOTE, message); 56 } 57 return false; 58 } 59 printNamesAndAnnotations(ExecutableElement exec)60 private String printNamesAndAnnotations(ExecutableElement exec) { 61 return String.format("%s.%s(%s)", 62 exec.getEnclosingElement(), 63 exec.getSimpleName(), 64 exec.getParameters().stream().map(this::printParameter).collect(joining(", "))); 65 } 66 printParameter(VariableElement param)67 private String printParameter(VariableElement param) { 68 return param.getAnnotationMirrors().stream().map(String::valueOf).collect(joining(" ")) 69 + (param.getAnnotationMirrors().isEmpty() ? "" : " ") 70 + param.getSimpleName(); 71 } 72 } 73