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Exp annotation hash generator #34

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Exp annotation hash generator #34

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84 changes: 84 additions & 0 deletions ...anofoundation/lob/app/accounting_reporting_core/service/internal/LOBVersionProcessor.java
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@@ -0,0 +1,84 @@
package org.cardanofoundation.lob.app.accounting_reporting_core.service.internal;

import com.google.auto.service.AutoService;
import com.squareup.javapoet.JavaFile;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeSpec;
import org.cardanofoundation.lob.app.accounting_reporting_core.domain.core.annotations.LOBVersionSinkRelevant;
import org.cardanofoundation.lob.app.accounting_reporting_core.domain.core.annotations.LOBVersionSourceRelevant;

import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import java.io.IOException;
import java.util.Set;

@AutoService(Processor.class)
@SupportedAnnotationTypes({
"org.cardanofoundation.lob.app.accounting_reporting_core.domain.core.annotations.LOBVersionSourceRelevant",
"org.cardanofoundation.lob.app.accounting_reporting_core.domain.core.annotations.LOBVersionSinkRelevant"
})
@SupportedSourceVersion(SourceVersion.RELEASE_21)
public class LOBVersionProcessor extends AbstractProcessor {

private Messager messager;

@Override
public synchronized void init(ProcessingEnvironment processingEnv) {
super.init(processingEnv);
messager = processingEnv.getMessager();
messager.printMessage(Diagnostic.Kind.NOTE, "Initializing LOBVersionProcessor...");
}

@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
messager.printMessage(Diagnostic.Kind.NOTE, "Generating class based on: LOBVersionSourceRelevant and LOBVersionSinkRelevant annotations");

// Collect all elements (fields) annotated with @LOBVersionSourceRelevant and @LOBVersionSinkRelevant
Set<? extends Element> sourceElements = roundEnv.getElementsAnnotatedWith(LOBVersionSourceRelevant.class);
Set<? extends Element> sinkElements = roundEnv.getElementsAnnotatedWith(LOBVersionSinkRelevant.class);

// Generate code to compute hash
if (!sourceElements.isEmpty()) {
generateHashMethod(sourceElements, "computeSourceHash", "LOBVersionSourceRelevant");
}

if (!sinkElements.isEmpty()) {
generateHashMethod(sinkElements, "computeSinkHash", "LOBVersionSinkRelevant");
}

return true; // annotations are claimed by this processor
}

private void generateHashMethod(Set<? extends Element> elements, String methodName, String annotationType) {
TypeSpec.Builder classBuilder = TypeSpec.classBuilder(methodName + "Generator")
.addModifiers(Modifier.PUBLIC, Modifier.FINAL);

MethodSpec.Builder methodBuilder = MethodSpec.methodBuilder(methodName)
.addModifiers(Modifier.PUBLIC, Modifier.STATIC)
.returns(String.class)
.addParameter(Object.class, "obj")
.addStatement("StringBuilder builder = new StringBuilder()");

for (Element element : elements) {
String fieldName = element.getSimpleName().toString();
methodBuilder.addStatement("builder.append(obj.getClass().getDeclaredField($S).get(obj))", fieldName);
}

methodBuilder.addStatement("return org.cardanofoundation.lob.app.support.crypto.SHA3.digestAsHex(builder.toString())");

classBuilder.addMethod(methodBuilder.build());

JavaFile javaFile = JavaFile.builder("org.cardanofoundation.lob.app.accounting_reporting_core.generated", classBuilder.build())
.build();

try {
javaFile.writeTo(processingEnv.getFiler());
} catch (IOException e) {
messager.printMessage(Diagnostic.Kind.ERROR, e.toString());
}
}
}
6 changes: 6 additions & 0 deletions build.gradle.kts
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ subprojects {
}
}


extra["springBootVersion"] = "3.3.3"
extra["springCloudVersion"] = "2023.0.0"
extra["springModulithVersion"] = "1.2.3"
Expand Down Expand Up @@ -95,6 +96,11 @@ subprojects {
implementation("org.apache.commons:commons-collections4:4.4")
implementation("org.javers:javers-core:7.6.1")

compileOnly("com.google.auto.service:auto-service:1.1.1")
annotationProcessor("com.google.auto.service:auto-service:1.1.1")

implementation("com.squareup:javapoet:1.13.0")

compileOnly("org.projectlombok:lombok:1.18.32")
annotationProcessor("org.projectlombok:lombok:1.18.32")
implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.5.0")
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