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Initial Commit (thombergs#142)
* Initial Commit Added Maven Annotation Processor Demo project. Initial commit. * Test - checking * Delete test.rtf * Initial commits Initial commits for sample code * Update SuppressWarningsDemo.java * Code changes till SafeVarargs Code changes till SafeVarargs * Completed source code Completed source code * Final draft Final draft version. Grammarly check done. * Deleted java docs Deleted java docs
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‎core-java/annotation-processing/AnnotationProcessorDemo/AnnotationProcessorDemo.zip‎

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‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>AnnotationProcessorDemo</artifactId>
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<groupId>com.reflectoring.annotation.processor</groupId>
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<version>1.0</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.reflectoring.annotation.processor</groupId>
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<artifactId>annotation-processor</artifactId>
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<version>1.0</version>
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<properties>
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<maven.compiler.source>11</maven.compiler.source>
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<maven.compiler.target>11</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.google.auto.service</groupId>
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<artifactId>auto-service</artifactId>
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<version>1.0.1</version>
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<scope>provided</scope>
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</dependency>
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<!-- https://mvnrepository.com/artifact/com.squareup/javapoet -->
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<dependency>
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<groupId>com.squareup</groupId>
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<artifactId>javapoet</artifactId>
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<version>1.9.0</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-text</artifactId>
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<version>1.9</version>
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</dependency>
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</dependencies>
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</project>

‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/src/main/java/com/reflectoring/annotation/processor/Builder.java‎

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package com.reflectoring.annotation.processor;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Target({ElementType.TYPE})
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@Retention(RetentionPolicy.SOURCE)
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public @interface Builder {
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}

‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/src/main/java/com/reflectoring/annotation/processor/BuilderProcessor.java‎

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package com.reflectoring.annotation.processor;
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import com.google.auto.service.AutoService;
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import com.squareup.javapoet.*;
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import org.apache.commons.text.CaseUtils;
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import javax.annotation.processing.*;
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import javax.lang.model.SourceVersion;
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import javax.lang.model.element.Element;
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import javax.lang.model.element.ElementKind;
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import javax.lang.model.element.Modifier;
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import javax.lang.model.element.TypeElement;
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import javax.lang.model.type.TypeMirror;
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import javax.lang.model.util.Elements;
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import javax.tools.Diagnostic;
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import javax.tools.JavaFileObject;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Set;
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import java.util.stream.Collectors;
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@SupportedAnnotationTypes("com.reflectoring.annotation.processor.Builder")
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@SupportedSourceVersion(SourceVersion.RELEASE_11)
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@AutoService(Processor.class)
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public class BuilderProcessor extends AbstractProcessor {
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private Filer filer;
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private Messager messager;
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private Elements elementUtils;
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@Override
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public synchronized void init(ProcessingEnvironment processingEnv) {
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super.init(processingEnv);
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filer = processingEnv.getFiler();
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messager = processingEnv.getMessager();
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elementUtils = processingEnv.getElementUtils();
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}
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@Override
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public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
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for (Element typeElement : roundEnv.getElementsAnnotatedWith(Builder.class)) {
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List<Element> fieldElements = typeElement.getEnclosedElements().stream().filter(e -> ElementKind.FIELD.equals(e.getKind())).collect(
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Collectors.toList());
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String packageName = elementUtils.getPackageOf(typeElement).getQualifiedName().toString();
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String className = typeElement.getSimpleName().toString();
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String builderName = String.format("%sBuilder", typeElement.getSimpleName().toString());
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String classVariableName = CaseUtils.toCamelCase(typeElement.getSimpleName().toString(), false, '_');
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try {
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//writeBuilderClass(packageName, className, classVariableName, builderName, fieldElements);
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writeJavaPoetBuilderClass(packageName, className, classVariableName, builderName, fieldElements, typeElement);
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} catch (IOException e) {
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messager.printMessage(Diagnostic.Kind.ERROR, "Failed to write file for element", typeElement);
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}
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}
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return true;
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}
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private String getBaseName(String name) {
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int lastPeriodIndex = name.lastIndexOf('.');
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if (lastPeriodIndex > 0) {
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name = name.substring(lastPeriodIndex + 1);
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}
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return name;
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}
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private void writeBuilderClass(String packageName, String className, String classVariableName, String builderName,
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List<Element> fieldElements) throws IOException {
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JavaFileObject builder = processingEnv.getFiler().createSourceFile(builderName);
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try (PrintWriter out = new PrintWriter(builder.openWriter())) {
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// Write the Package name
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out.print("package ");
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out.print(packageName);
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out.println(";");
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out.println();
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// Write the Class name
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out.print("public final class ");
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out.print(builderName);
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out.println(" {");
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out.println();
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// Write the Field names
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for (Element fieldElement : fieldElements) {
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TypeMirror typeMirror = fieldElement.asType();
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String fieldTypeName = getBaseName(typeMirror.toString());
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String fieldName = getBaseName(fieldElement.getSimpleName().toString());
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out.print("private ");
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out.print(fieldTypeName);
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out.print(" ");
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out.print(fieldName);
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out.print(";");
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out.println();
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}
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out.println();
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// Write the Setters
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for (Element fieldElement : fieldElements) {
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TypeMirror typeMirror = fieldElement.asType();
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String fieldTypeName = getBaseName(typeMirror.toString());
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String fieldName = getBaseName(fieldElement.getSimpleName().toString());
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out.print("public ");
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out.print(" ");
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out.print(builderName);
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out.print(" ");
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out.print(fieldName);
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out.print("(");
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out.print(fieldTypeName);
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out.print(" ");
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out.print(fieldName);
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out.print(") {");
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out.println();
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out.print(" this.");
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out.print(fieldName);
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out.print(" = ");
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out.print(fieldName);
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out.print(";");
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out.println();
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out.print(" return this;");
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out.println();
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out.print("}");
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out.println();
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out.println();
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}
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// Write the build function
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out.print("public ");
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out.print(" ");
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out.print(className);
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out.print(" build() {");
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out.println();
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out.print(" ");
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out.print(className);
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out.print(" ");
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out.print(classVariableName);
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out.print(" = new ");
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out.print(className);
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out.print("();");
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out.println();
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for (Element fieldElement : fieldElements) {
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TypeMirror typeMirror = fieldElement.asType();
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String fieldTypeName = getBaseName(typeMirror.toString());
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String fieldName = getBaseName(fieldElement.getSimpleName().toString());
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out.print(" ");
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out.print(classVariableName);
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out.print(".set");
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out.print(CaseUtils.toCamelCase(fieldName, true, '_'));
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out.print("(this.");
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out.print(fieldName);
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out.println(");");
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}
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out.println();
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out.print(" return ");
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out.print(classVariableName);
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out.print(";");
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out.println();
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out.println(" }");
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out.println("}");
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}
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}
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private void writeJavaPoetBuilderClass(String packageName, String className, String classVariableName, String builderName,
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List<Element> fieldElements, Element typeElement) throws IOException {
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ClassName builderType = ClassName.get(packageName, builderName);
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List<FieldSpec> fields = new ArrayList<>(fieldElements.size());
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List<MethodSpec> fieldSetters = new ArrayList<>(fieldElements.size());
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// Generate the fields and field setters
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generateFieldsAndSetters(fields, fieldSetters, fieldElements, builderType);
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TypeName targetType = TypeName.get(typeElement.asType());
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// Generate the build method
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MethodSpec buildMethod = generateBuildMethod(targetType, classVariableName, fields);
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TypeSpec builder = TypeSpec.classBuilder(builderType)
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.addModifiers(Modifier.PUBLIC, Modifier.FINAL)
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.addFields(fields)
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.addMethods(fieldSetters)
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.addMethod(buildMethod).build();
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JavaFile file = JavaFile.builder(builderType.packageName(), builder.toBuilder().build()).build();
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file.writeTo(filer);
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}
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private void generateFieldsAndSetters(List<FieldSpec> fields, List<MethodSpec> fieldSetters, List<Element> fieldElements, ClassName builderType){
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for (Element fieldElement : fieldElements) {
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TypeName typeName = TypeName.get(fieldElement.asType());
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String fieldName = getBaseName(fieldElement.getSimpleName().toString());
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fields.add(FieldSpec.builder(typeName, fieldName, Modifier.PRIVATE).build());
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fieldSetters.add(
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MethodSpec.methodBuilder(fieldName)
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.addModifiers(Modifier.PUBLIC)
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.returns(builderType)
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.addParameter(typeName, fieldName)
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.addStatement("this.$N = $N", fieldName, fieldName)
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.addStatement("return this").build());
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}
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}
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private MethodSpec generateBuildMethod(TypeName targetType, String variableName, List<FieldSpec> fields) {
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MethodSpec.Builder buildMethodBuilder = MethodSpec.methodBuilder("build")
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.addModifiers(Modifier.PUBLIC)
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.returns(targetType)
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.addStatement("$1T $2N = new $1T()", targetType, variableName);
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for (FieldSpec field : fields) {
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buildMethodBuilder.addStatement("$1N.set$2N(this.$3N)", variableName, CaseUtils.toCamelCase(field.name, true, '_'), field.name);
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}
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buildMethodBuilder.addStatement("return $N", variableName);
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return buildMethodBuilder.build();
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}
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}

‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/annotation-processor-1.0.jar‎

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‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/classes/META-INF/services/javax.annotation.processing.Processor‎

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com.reflectoring.annotation.processor.BuilderProcessor

‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/classes/com/reflectoring/annotation/processor/Builder.class‎

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‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/classes/com/reflectoring/annotation/processor/BuilderProcessor.class‎

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‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/maven-archiver/pom.properties‎

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#Generated by Maven
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#Wed Jan 26 14:56:24 EST 2022
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groupId=com.reflectoring.annotation.processor
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artifactId=annotation-processor
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version=1.0

‎core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst‎

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META-INF\services\javax.annotation.processing.Processor
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com\reflectoring\annotation\processor\Builder.class
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com\reflectoring\annotation\processor\BuilderProcessor.class

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