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Initial Commit (#142)

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* 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
This commit is contained in:
syedaf
2022-02-04 19:34:58 -05:00
committed by GitHub
parent 9d6f34dd98
commit 2b97cc155f
91 changed files with 996 additions and 0 deletions
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42
core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>AnnotationProcessorDemo</artifactId>
<groupId>com.reflectoring.annotation.processor</groupId>
<version>1.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.reflectoring.annotation.processor</groupId>
<artifactId>annotation-processor</artifactId>
<version>1.0</version>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.google.auto.service</groupId>
<artifactId>auto-service</artifactId>
<version>1.0.1</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.squareup/javapoet -->
<dependency>
<groupId>com.squareup</groupId>
<artifactId>javapoet</artifactId>
<version>1.9.0</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-text</artifactId>
<version>1.9</version>
</dependency>
</dependencies>
</project>

11
core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/src/main/java/com/reflectoring/annotation/processor/Builder.java Normal file
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package com.reflectoring.annotation.processor;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.SOURCE)
public @interface Builder {
}

249
core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/src/main/java/com/reflectoring/annotation/processor/BuilderProcessor.java Normal file
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package com.reflectoring.annotation.processor;
import com.google.auto.service.AutoService;
import com.squareup.javapoet.*;
import org.apache.commons.text.CaseUtils;
import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import javax.tools.Diagnostic;
import javax.tools.JavaFileObject;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
@SupportedAnnotationTypes("com.reflectoring.annotation.processor.Builder")
@SupportedSourceVersion(SourceVersion.RELEASE_11)
@AutoService(Processor.class)
public class BuilderProcessor extends AbstractProcessor {
private Filer filer;
private Messager messager;
private Elements elementUtils;
@Override
public synchronized void init(ProcessingEnvironment processingEnv) {
super.init(processingEnv);
filer = processingEnv.getFiler();
messager = processingEnv.getMessager();
elementUtils = processingEnv.getElementUtils();
}
@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
for (Element typeElement : roundEnv.getElementsAnnotatedWith(Builder.class)) {
List<Element> fieldElements = typeElement.getEnclosedElements().stream().filter(e -> ElementKind.FIELD.equals(e.getKind())).collect(
Collectors.toList());
String packageName = elementUtils.getPackageOf(typeElement).getQualifiedName().toString();
String className = typeElement.getSimpleName().toString();
String builderName = String.format("%sBuilder", typeElement.getSimpleName().toString());
String classVariableName = CaseUtils.toCamelCase(typeElement.getSimpleName().toString(), false, '_');
try {
//writeBuilderClass(packageName, className, classVariableName, builderName, fieldElements);
writeJavaPoetBuilderClass(packageName, className, classVariableName, builderName, fieldElements, typeElement);
} catch (IOException e) {
messager.printMessage(Diagnostic.Kind.ERROR, "Failed to write file for element", typeElement);
}
}
return true;
}
private String getBaseName(String name) {
int lastPeriodIndex = name.lastIndexOf('.');
if (lastPeriodIndex > 0) {
name = name.substring(lastPeriodIndex + 1);
}
return name;
}
private void writeBuilderClass(String packageName, String className, String classVariableName, String builderName,
List<Element> fieldElements) throws IOException {
JavaFileObject builder = processingEnv.getFiler().createSourceFile(builderName);
try (PrintWriter out = new PrintWriter(builder.openWriter())) {
// Write the Package name
out.print("package ");
out.print(packageName);
out.println(";");
out.println();
// Write the Class name
out.print("public final class ");
out.print(builderName);
out.println(" {");
out.println();
// Write the Field names
for (Element fieldElement : fieldElements) {
TypeMirror typeMirror = fieldElement.asType();
String fieldTypeName = getBaseName(typeMirror.toString());
String fieldName = getBaseName(fieldElement.getSimpleName().toString());
out.print("private ");
out.print(fieldTypeName);
out.print(" ");
out.print(fieldName);
out.print(";");
out.println();
}
out.println();
// Write the Setters
for (Element fieldElement : fieldElements) {
TypeMirror typeMirror = fieldElement.asType();
String fieldTypeName = getBaseName(typeMirror.toString());
String fieldName = getBaseName(fieldElement.getSimpleName().toString());
out.print("public ");
out.print(" ");
out.print(builderName);
out.print(" ");
out.print(fieldName);
out.print("(");
out.print(fieldTypeName);
out.print(" ");
out.print(fieldName);
out.print(") {");
out.println();
out.print(" this.");
out.print(fieldName);
out.print(" = ");
out.print(fieldName);
out.print(";");
out.println();
out.print(" return this;");
out.println();
out.print("}");
out.println();
out.println();
}
// Write the build function
out.print("public ");
out.print(" ");
out.print(className);
out.print(" build() {");
out.println();
out.print(" ");
out.print(className);
out.print(" ");
out.print(classVariableName);
out.print(" = new ");
out.print(className);
out.print("();");
out.println();
for (Element fieldElement : fieldElements) {
TypeMirror typeMirror = fieldElement.asType();
String fieldTypeName = getBaseName(typeMirror.toString());
String fieldName = getBaseName(fieldElement.getSimpleName().toString());
out.print(" ");
out.print(classVariableName);
out.print(".set");
out.print(CaseUtils.toCamelCase(fieldName, true, '_'));
out.print("(this.");
out.print(fieldName);
out.println(");");
}
out.println();
out.print(" return ");
out.print(classVariableName);
out.print(";");
out.println();
out.println(" }");
out.println("}");
}
}
private void writeJavaPoetBuilderClass(String packageName, String className, String classVariableName, String builderName,
List<Element> fieldElements, Element typeElement) throws IOException {
ClassName builderType = ClassName.get(packageName, builderName);
List<FieldSpec> fields = new ArrayList<>(fieldElements.size());
List<MethodSpec> fieldSetters = new ArrayList<>(fieldElements.size());
// Generate the fields and field setters
generateFieldsAndSetters(fields, fieldSetters, fieldElements, builderType);
TypeName targetType = TypeName.get(typeElement.asType());
// Generate the build method
MethodSpec buildMethod = generateBuildMethod(targetType, classVariableName, fields);
TypeSpec builder = TypeSpec.classBuilder(builderType)
.addModifiers(Modifier.PUBLIC, Modifier.FINAL)
.addFields(fields)
.addMethods(fieldSetters)
.addMethod(buildMethod).build();
JavaFile file = JavaFile.builder(builderType.packageName(), builder.toBuilder().build()).build();
file.writeTo(filer);
}
private void generateFieldsAndSetters(List<FieldSpec> fields, List<MethodSpec> fieldSetters, List<Element> fieldElements, ClassName builderType){
for (Element fieldElement : fieldElements) {
TypeName typeName = TypeName.get(fieldElement.asType());
String fieldName = getBaseName(fieldElement.getSimpleName().toString());
fields.add(FieldSpec.builder(typeName, fieldName, Modifier.PRIVATE).build());
fieldSetters.add(
MethodSpec.methodBuilder(fieldName)
.addModifiers(Modifier.PUBLIC)
.returns(builderType)
.addParameter(typeName, fieldName)
.addStatement("this.$N = $N", fieldName, fieldName)
.addStatement("return this").build());
}
}
private MethodSpec generateBuildMethod(TypeName targetType, String variableName, List<FieldSpec> fields) {
MethodSpec.Builder buildMethodBuilder = MethodSpec.methodBuilder("build")
.addModifiers(Modifier.PUBLIC)
.returns(targetType)
.addStatement("$1T $2N = new $1T()", targetType, variableName);
for (FieldSpec field : fields) {
buildMethodBuilder.addStatement("$1N.set$2N(this.$3N)", variableName, CaseUtils.toCamelCase(field.name, true, '_'), field.name);
}
buildMethodBuilder.addStatement("return $N", variableName);
return buildMethodBuilder.build();
}
}

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core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/classes/META-INF/services/javax.annotation.processing.Processor Normal file
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com.reflectoring.annotation.processor.BuilderProcessor

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core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/maven-archiver/pom.properties Normal file
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#Generated by Maven
#Wed Jan 26 14:56:24 EST 2022
groupId=com.reflectoring.annotation.processor
artifactId=annotation-processor
version=1.0

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core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst Normal file
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META-INF\services\javax.annotation.processing.Processor
com\reflectoring\annotation\processor\Builder.class
com\reflectoring\annotation\processor\BuilderProcessor.class

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core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst Normal file
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D:\Documents\IntelliJ Projects\AnnotationProcessorDemo\annotation-processor\src\main\java\com\reflectoring\annotation\processor\Builder.java
D:\Documents\IntelliJ Projects\AnnotationProcessorDemo\annotation-processor\src\main\java\com\reflectoring\annotation\processor\BuilderProcessor.java

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core-java/annotation-processing/AnnotationProcessorDemo/annotation-processor/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst Normal file
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