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source code generation for querydsl
/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mysema.query.apt;
import java.io.IOException;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.util.*;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.*;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.NoType;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.ElementFilter;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import javax.tools.Diagnostic;
import javax.tools.Diagnostic.Kind;
import javax.tools.JavaFileObject;
import com.mysema.codegen.JavaWriter;
import com.mysema.codegen.model.Parameter;
import com.mysema.codegen.model.Type;
import com.mysema.codegen.model.TypeCategory;
import com.mysema.query.annotations.QueryDelegate;
import com.mysema.query.annotations.QueryExclude;
import com.mysema.query.annotations.QueryProjection;
import com.mysema.query.codegen.*;
/**
* Base class for Querydsl annotation processors, contains the main processing logic. The subclasses
* just provide the configuration.
*
* @author tiwe
*
*/
public abstract class AbstractQuerydslProcessor extends AbstractProcessor {
// TODO replace with proper injections in Querydsl 4.0.0
public static Types TYPES;
public static Elements ELEMENTS;
public static final Boolean ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS = Boolean.FALSE;
private final TypeExtractor typeExtractor = new TypeExtractor(true);
private Configuration conf;
private RoundEnvironment roundEnv;
private ExtendedTypeFactory typeFactory;
private TypeElementHandler elementHandler;
private Context context;
@Override
public boolean process(Set annotations, RoundEnvironment roundEnv) {
TYPES = processingEnv.getTypeUtils();
ELEMENTS = processingEnv.getElementUtils();
processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "Running " + getClass().getSimpleName());
if (roundEnv.processingOver() || annotations.size() == 0) {
return ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS;
}
if (roundEnv.getRootElements() == null || roundEnv.getRootElements().isEmpty()) {
processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "No sources to process");
return ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS;
}
conf = createConfiguration(roundEnv);
context = new Context();
Set> entityAnnotations = conf.getEntityAnnotations();
TypeMappings typeMappings = conf.getTypeMappings();
QueryTypeFactory queryTypeFactory = conf.getQueryTypeFactory();
this.typeFactory = new ExtendedTypeFactory(processingEnv, conf, entityAnnotations, typeMappings, queryTypeFactory, conf.getVariableNameFunction());
elementHandler = new TypeElementHandler(conf, typeFactory, typeMappings, queryTypeFactory);
this.roundEnv = roundEnv;
// process annotations
processAnnotations();
validateMetaTypes();
// serialize created types
serializeMetaTypes();
return ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS;
}
private void processAnnotations() {
processExclusions();
Set elements = collectElements();
// create meta models
for (Element element : elements) {
typeFactory.getEntityType(element.asType(), false);
}
for (Element element : elements) {
typeFactory.getEntityType(element.asType(), true);
}
// add properties
boolean embeddableAnn = conf.getEmbeddableAnnotation() != null;
boolean altEntityAnn = conf.getAlternativeEntityAnnotation() != null;
boolean superAnn = conf.getSuperTypeAnnotation() != null;
for (TypeElement element : elements) {
EntityType entityType = elementHandler.handleEntityType(element);
registerTypeElement(entityType.getFullName(), element);
if (element.getAnnotation(conf.getEntityAnnotation()) != null) {
context.entityTypes.put(entityType.getFullName(), entityType);
} else if (altEntityAnn && element.getAnnotation(conf.getAlternativeEntityAnnotation()) != null) {
context.entityTypes.put(entityType.getFullName(), entityType);
} else if (embeddableAnn && element.getAnnotation(conf.getEmbeddableAnnotation()) != null ) {
context.embeddableTypes.put(entityType.getFullName(), entityType);
} else if (superAnn && element.getAnnotation(conf.getSuperTypeAnnotation()) != null) {
context.supertypes.put(entityType.getFullName(), entityType);
} else if (!entityType.getDelegates().isEmpty()) {
context.extensionTypes.put(entityType.getFullName(), entityType);
} else {
context.embeddableTypes.put(entityType.getFullName(), entityType);
}
context.allTypes.put(entityType.getFullName(), entityType);
}
// track also methods from external entity types
for (EntityType entityType : new ArrayList(typeFactory.getEntityTypes())) {
String fullName = entityType.getFullName();
if (!context.allTypes.keySet().contains(fullName)) {
//System.err.println(fullName);
TypeElement element = processingEnv.getElementUtils().getTypeElement(fullName);
if (element != null) {
elementHandler.handleEntityType(element);
}
}
}
// add external parents
for (Element element : elements) {
EntityType entityType = typeFactory.getEntityType(element.asType(), false);
addExternalParents(entityType);
}
// add properties from parents
Set handled = new HashSet();
for (EntityType entityType : context.allTypes.values()) {
addSupertypeFields(entityType, handled);
}
processProjectionTypes(elements);
// extend entity types
typeFactory.extendTypes();
context.clean();
}
private void addExternalParents(EntityType entityType) {
Deque superTypes = new ArrayDeque();
if (entityType.getSuperType() != null) {
superTypes.push(entityType.getSuperType().getType());
}
while (!superTypes.isEmpty()) {
Type superType = superTypes.pop();
if (!context.allTypes.containsKey(superType.getFullName())) {
TypeElement typeElement = processingEnv.getElementUtils().getTypeElement(superType.getFullName());
if (typeElement == null) {
throw new IllegalStateException("Found no type for " + superType.getFullName());
}
if (conf.isStrictMode() && !TypeUtils.hasAnnotationOfType(typeElement, conf.getEntityAnnotations())) {
continue;
}
EntityType superEntityType = elementHandler.handleEntityType(typeElement);
if (superEntityType.getSuperType() != null) {
superTypes.push(superEntityType.getSuperType().getType());
}
context.allTypes.put(superType.getFullName(), superEntityType);
}
}
}
protected Set collectElements() {
Set elements = new HashSet();
// from delegate methods
elements.addAll(processDelegateMethods());
// from class annotations
for (Class annotation : conf.getEntityAnnotations()) {
for (Element element : getElements(annotation)) {
if (element instanceof TypeElement) {
elements.add((TypeElement) element);
}
}
}
// from package annotations
if (conf.getEntitiesAnnotation() != null) {
for (Element element : getElements(conf.getEntitiesAnnotation())) {
AnnotationMirror mirror = TypeUtils.getAnnotationMirrorOfType(element, conf.getEntitiesAnnotation());
elements.addAll(TypeUtils.getAnnotationValuesAsElements(mirror, "value"));
}
}
// from embedded annotations
if (conf.getEmbeddedAnnotation() != null) {
elements.addAll(getEmbeddedTypes());
}
// from embedded
if (conf.isUnknownAsEmbedded()) {
elements.addAll(getTypeFromProperties(elements));
}
// from annotation less supertypes
if (!conf.isStrictMode()) {
elements.addAll(getAnnotationlessSupertypes(elements));
}
// register possible embedded types of non-tracked supertypes
if (conf.getEmbeddedAnnotation() != null) {
Class embedded = conf.getEmbeddedAnnotation();
Set embeddedElements = new HashSet();
for (TypeElement element : elements) {
TypeMirror superTypeMirror = element.getSuperclass();
while (superTypeMirror != null) {
TypeElement superTypeElement = (TypeElement) processingEnv.getTypeUtils().asElement(superTypeMirror);
if (superTypeElement != null) {
List enclosed = superTypeElement.getEnclosedElements();
for (Element child : enclosed) {
if (child.getAnnotation(embedded) != null) {
handleEmbeddedType(child, embeddedElements);
}
}
superTypeMirror = superTypeElement.getSuperclass();
if (superTypeMirror instanceof NoType) {
superTypeMirror = null;
}
} else {
superTypeMirror = null;
}
}
}
// register found elements
for (TypeElement element : embeddedElements) {
if (!elements.contains(element)) {
elementHandler.handleEntityType(element);
}
}
}
return elements;
}
private Set getAnnotationlessSupertypes(Set elements) {
Set rv = new HashSet();
for (TypeElement element : elements) {
TypeMirror superTypeMirror = element.getSuperclass();
while (superTypeMirror != null) {
TypeElement superTypeElement = (TypeElement) processingEnv.getTypeUtils().asElement(superTypeMirror);
if (superTypeElement != null
&& !superTypeElement.toString().startsWith("java.lang.")
&& !TypeUtils.hasAnnotationOfType(superTypeElement, conf.getEntityAnnotations())) {
rv.add(superTypeElement);
superTypeMirror = superTypeElement.getSuperclass();
if (superTypeMirror instanceof NoType) {
superTypeMirror = null;
}
} else {
superTypeMirror = null;
}
}
}
return rv;
}
private void registerTypeElement(String entityName, TypeElement element) {
Set elements = context.typeElements.get(entityName);
if (elements == null) {
elements = new HashSet();
context.typeElements.put(entityName, elements);
}
elements.add(element);
}
private void processProjectionTypes(Set elements) {
Set visited = new HashSet();
for (Element element : getElements(QueryProjection.class)) {
Element parent = element.getEnclosingElement();
if (!elements.contains(parent) && !visited.contains(parent)) {
EntityType model = elementHandler.handleProjectionType((TypeElement)parent);
registerTypeElement(model.getFullName(), (TypeElement)parent);
context.projectionTypes.put(model.getFullName(), model);
visited.add(parent);
}
}
}
private Set getEmbeddedTypes() {
Set elements = new HashSet();
// only creation
for (Element element : getElements(conf.getEmbeddedAnnotation())) {
handleEmbeddedType(element, elements);
}
return elements;
}
private void handleEmbeddedType(Element element, Set elements) {
TypeMirror type = element.asType();
if (element.getKind() == ElementKind.METHOD) {
type = ((ExecutableElement)element).getReturnType();
}
String typeName = type.toString();
if (typeName.startsWith(Collection.class.getName())
|| typeName.startsWith(List.class.getName())
|| typeName.startsWith(Set.class.getName())) {
type = ((DeclaredType)type).getTypeArguments().get(0);
} else if (typeName.startsWith(Map.class.getName())) {
type = ((DeclaredType)type).getTypeArguments().get(1);
}
TypeElement typeElement = typeExtractor.visit(type);
if (typeElement != null && !TypeUtils.hasAnnotationOfType(typeElement, conf.getEntityAnnotations())) {
if (!typeElement.getQualifiedName().toString().startsWith("java.")) {
elements.add(typeElement);
}
}
}
private Set getTypeFromProperties(Set parents) {
Set elements = new HashSet();
for (Element element : parents) {
if (element instanceof TypeElement) {
processFromProperties((TypeElement)element, elements);
}
}
Iterator iterator = elements.iterator();
while (iterator.hasNext()) {
TypeElement element = iterator.next();
String name = element.getQualifiedName().toString();
if (name.startsWith("java.") || name.startsWith("org.joda.time.")) {
iterator.remove();
} else {
boolean annotated = false;
for (Class annotation : conf.getEntityAnnotations()) {
annotated |= element.getAnnotation(annotation) != null;
}
if (annotated) {
iterator.remove();
}
}
}
return elements;
}
private void processFromProperties(TypeElement type, Set types) {
List children = type.getEnclosedElements();
VisitorConfig config = conf.getConfig(type, children);
// fields
if (config.visitFieldProperties()) {
for (VariableElement field : ElementFilter.fieldsIn(children)) {
TypeElement typeElement = typeExtractor.visit(field.asType());
if (typeElement != null) {
types.add(typeElement);
}
}
}
// getters
if (config.visitMethodProperties()) {
for (ExecutableElement method : ElementFilter.methodsIn(children)) {
String name = method.getSimpleName().toString();
if ((name.startsWith("get") || name.startsWith("is")) && method.getParameters().isEmpty()) {
TypeElement typeElement = typeExtractor.visit(method.getReturnType());
if (typeElement != null) {
types.add(typeElement);
}
}
}
}
}
private void addSupertypeFields(EntityType model, Set handled) {
if (handled.add(model)) {
for (Supertype supertype : model.getSuperTypes()) {
EntityType entityType = context.allTypes.get(supertype.getType().getFullName());
if (entityType != null) {
addSupertypeFields(entityType, handled);
supertype.setEntityType(entityType);
model.include(supertype);
}
}
}
}
private void processExclusions() {
for (Element element : getElements(QueryExclude.class)) {
if (element instanceof PackageElement) {
conf.addExcludedPackage(((PackageElement)element).getQualifiedName().toString());
} else if (element instanceof TypeElement) {
conf.addExcludedClass(((TypeElement)element).getQualifiedName().toString());
} else {
throw new IllegalArgumentException(element.toString());
}
}
}
private Set processDelegateMethods() {
Set delegateMethods = (Set)getElements(QueryDelegate.class);
Set typeElements = new HashSet();
for (Element delegateMethod : delegateMethods) {
ExecutableElement method = (ExecutableElement)delegateMethod;
Element element = delegateMethod.getEnclosingElement();
String name = method.getSimpleName().toString();
Type delegateType = typeFactory.getType(element.asType(), true);
Type returnType = typeFactory.getType(method.getReturnType(), true);
List parameters = elementHandler.transformParams(method.getParameters());
// remove first element
parameters = parameters.subList(1, parameters.size());
EntityType entityType = null;
for (AnnotationMirror annotation : delegateMethod.getAnnotationMirrors()) {
if (TypeUtils.isAnnotationMirrorOfType(annotation, QueryDelegate.class)) {
TypeMirror type = TypeUtils.getAnnotationValueAsTypeMirror(annotation, "value");
if (type != null) {
entityType = typeFactory.getEntityType(type, true);
}
}
}
if (entityType != null) {
registerTypeElement(entityType.getFullName(), (TypeElement)element);
entityType.addDelegate(new Delegate(entityType, delegateType, name, parameters, returnType));
TypeElement typeElement = processingEnv.getElementUtils().getTypeElement(entityType.getFullName());
boolean isAnnotated = false;
for (Class ann : conf.getEntityAnnotations()) {
if (typeElement.getAnnotation(ann) != null) {
isAnnotated = true;
}
}
if (isAnnotated) {
// handle also properties of entity type
typeElements.add(processingEnv.getElementUtils().getTypeElement(entityType.getFullName()));
} else {
// skip handling properties
context.extensionTypes.put(entityType.getFullName(), entityType);
context.allTypes.put(entityType.getFullName(), entityType);
}
}
}
return typeElements;
}
private void validateMetaTypes() {
for (Collection entityTypes : Arrays.asList(
context.supertypes.values(),
context.entityTypes.values(),
context.extensionTypes.values(),
context.embeddableTypes.values(),
context.projectionTypes.values())) {
for (EntityType entityType : entityTypes) {
for (Property property : entityType.getProperties()) {
if (property.getInits() != null && property.getInits().size() > 0) {
validateInits(entityType, property);
}
}
}
}
}
protected void validateInits(EntityType entityType, Property property) {
for (String init : property.getInits()) {
if (!init.startsWith("*") && property.getType() instanceof EntityType) {
String initProperty = init.contains(".") ? init.substring(0, init.indexOf('.')) : init;
if (!((EntityType)property.getType()).getPropertyNames().contains(initProperty)) {
processingEnv.getMessager().printMessage(Kind.ERROR,
"Illegal inits of " + entityType.getFullName()+ "." + property.getName() + ": " +
initProperty + " not found");
}
}
}
}
private void serializeMetaTypes() {
if (!context.supertypes.isEmpty()) {
processingEnv.getMessager().printMessage(Kind.NOTE, "Serializing Supertypes");
serialize(conf.getSupertypeSerializer(), context.supertypes.values());
}
if (!context.entityTypes.isEmpty()) {
processingEnv.getMessager().printMessage(Kind.NOTE, "Serializing Entity types");
serialize(conf.getEntitySerializer(), context.entityTypes.values());
}
if (!context.extensionTypes.isEmpty()) {
processingEnv.getMessager().printMessage(Kind.NOTE, "Serializing Extension types");
serialize(conf.getEmbeddableSerializer(), context.extensionTypes.values());
}
if (!context.embeddableTypes.isEmpty()) {
processingEnv.getMessager().printMessage(Kind.NOTE, "Serializing Embeddable types");
serialize(conf.getEmbeddableSerializer(), context.embeddableTypes.values());
}
if (!context.projectionTypes.isEmpty()) {
processingEnv.getMessager().printMessage(Kind.NOTE, "Serializing Projection types");
serialize(conf.getDTOSerializer(), context.projectionTypes.values());
}
}
private Set getElements(Class a) {
return roundEnv.getElementsAnnotatedWith(a);
}
@Override
public SourceVersion getSupportedSourceVersion() {
return SourceVersion.latestSupported();
}
private void serialize(Serializer serializer, Collection models) {
for (EntityType model : models) {
try {
Type type = conf.getTypeMappings().getPathType(model, model, true);
String packageName = type.getPackageName();
String className = !packageName.isEmpty() ? (packageName + "." + type.getSimpleName()) : type.getSimpleName();
// skip if type is excluded class or in excluded package
if (conf.isExcludedPackage(model.getPackageName()) || conf.isExcludedClass(model.getFullName())) {
continue;
}
Set elements = context.typeElements.get(model.getFullName());
if (elements == null) {
elements = new HashSet();
}
for (Property property : model.getProperties()) {
if (property.getType().getCategory() == TypeCategory.CUSTOM) {
Set customElements = context.typeElements.get(property.getType().getFullName());
if (customElements != null) {
elements.addAll(customElements);
}
}
}
processingEnv.getMessager().printMessage(Kind.NOTE, "Generating " + className + " for " + elements);
JavaFileObject fileObject = processingEnv.getFiler().createSourceFile(className,
elements.toArray(new Element[elements.size()]));
Writer writer = fileObject.openWriter();
try {
SerializerConfig serializerConfig = conf.getSerializerConfig(model);
serializer.serialize(model, serializerConfig, new JavaWriter(writer));
} finally {
if (writer != null) {
writer.close();
}
}
} catch (IOException e) {
System.err.println(e.getMessage());
processingEnv.getMessager().printMessage(Kind.ERROR, e.getMessage());
}
}
}
protected abstract Configuration createConfiguration(RoundEnvironment roundEnv);
}
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