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feature(gradle-test): provide ablity for indexes provides by third party lib. #119

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feature(gradle-test): provide ablity for indexes provides by third party lib. #119

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49 changes: 47 additions & 2 deletions ...-java/src/main/java/org/terasology/gestalt/annotation/processing/ClassIndexProcessor.java
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Original file line number Diff line number Diff line change
@@ -1,13 +1,17 @@
package org.terasology.gestalt.annotation.processing;

import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Queues;
import org.terasology.context.annotation.BindAnnotationFor;
import org.terasology.context.annotation.Index;
import org.terasology.context.annotation.IndexInherited;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.Filer;
import javax.annotation.processing.ProcessingEnvironment;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ElementKind;
import javax.lang.model.element.PackageElement;
Expand All @@ -19,8 +23,11 @@
import javax.tools.StandardLocation;
import java.io.IOException;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import java.util.Optional;
import java.util.Queue;
import java.util.Set;

Expand All @@ -31,17 +38,34 @@ public class ClassIndexProcessor extends AbstractProcessor {
private SubtypesTypeWriter subtypesTypeWriter;
private ElementUtility elementUtility;

private Multimap<TypeMirror, Class<? extends Annotation>> boundAnnotations;

@Override
public synchronized void init(ProcessingEnvironment processingEnv) {
super.init(processingEnv);
filer = processingEnv.getFiler();
annotationTypeWriter = new AnnotationTypeWriter(filer);
subtypesTypeWriter = new SubtypesTypeWriter(filer);
elementUtility = new ElementUtility(processingEnv.getElementUtils(), processingEnv.getTypeUtils());
boundAnnotations = HashMultimap.create();
}

@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
for (TypeElement annotation : annotations) {
if (annotation.asType().toString().equals(BindAnnotationFor.class.getName())) {
for (Element type : roundEnv.getElementsAnnotatedWith(annotation)) {
TypeMirror foreighElement = getBindAnnotationFor(type);
if (elementUtility.hasStereotype(type, Collections.singletonList(IndexInherited.class.getName()))) {
boundAnnotations.put(foreighElement, IndexInherited.class);
}
if (elementUtility.hasStereotype(type, Collections.singletonList(Index.class.getName()))) {
boundAnnotations.put(foreighElement, Index.class);
}
}
}
}

for (TypeElement annotation : annotations) {
// Annotation Index
processAnnotationIndex(roundEnv, annotation);
Expand Down Expand Up @@ -71,7 +95,7 @@ private void processSubtypeIndexInReverseWay(Element type) {
TypeMirror candidate = supers.poll();
if (candidate.getKind() != TypeKind.NONE) {
if (elementUtility.hasStereotype(elementUtility.getTypes().asElement(candidate),
Collections.singletonList(IndexInherited.class.getName()))) {
Collections.singletonList(IndexInherited.class.getName())) || boundAnnotations.containsEntry(candidate, IndexInherited.class)) {
TypeElement candidateElement = (TypeElement) elementUtility.getTypes().asElement(elementUtility.getTypes().erasure(candidate));
TypeElement erasedType = (TypeElement) elementUtility.getTypes().asElement(elementUtility.getTypes().erasure(type.asType()));
subtypesTypeWriter.writeSubType(elementUtility.getElements().getBinaryName(candidateElement).toString(),
Expand All @@ -94,7 +118,7 @@ private void processSubtypeIndexByDirectMarked(RoundEnvironment roundEnv, TypeEl
TypeMirror candidate = supers.poll();
if (candidate.getKind() != TypeKind.NONE) {
if (elementUtility.hasStereotype(elementUtility.getTypes().asElement(candidate),
Collections.singletonList(IndexInherited.class.getName())))
Collections.singletonList(IndexInherited.class.getName())) || boundAnnotations.containsEntry(candidate, IndexInherited.class))
subtypesTypeWriter.writeSubType(elementUtility.getTypes().erasure(candidate).toString(), elementUtility.getTypes().erasure(type.asType()).toString());
supers.addAll(elementUtility.getTypes().directSupertypes(candidate));
}
Expand All @@ -117,6 +141,27 @@ private void processAnnotationIndex(RoundEnvironment roundEnv, TypeElement annot
}
}

private TypeMirror getBindAnnotationFor(Element element) {
return (TypeMirror) getAnnotationValue(element, BindAnnotationFor.class, "value").orElse(null);
}

private Optional<Object> getAnnotationValue(Element element, Class<?> annotation, String fieldName) {
return element
.getAnnotationMirrors()
.stream()
.filter(am -> am.getAnnotationType().toString().equals(annotation.getName()))
.map(am -> am.getElementValues()
.entrySet()
.stream()
.filter(kv -> kv.getKey().getSimpleName().toString().equals(fieldName))
.map(Map.Entry::getValue)
.findFirst())
.filter(Optional::isPresent)
.map(Optional::get)
.map(AnnotationValue::getValue)
.findFirst();
}

private void writeIndexes() {
try {
annotationTypeWriter.finish();
Expand Down
18 changes: 18 additions & 0 deletions gestalt-inject/src/main/java/org/terasology/context/annotation/BindAnnotationFor.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
package org.terasology.context.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
* Provides binding gestalt-di's annotation for foreigh classes notated at `value`.
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Documented
public @interface BindAnnotationFor {
Class value();
}

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