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JPA Codegen support for Querydsl
/*
* Copyright 2013, Mysema Ltd
*
* 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.jpa.codegen;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
import javax.persistence.Embeddable;
import javax.persistence.Entity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.mysema.codegen.CodeWriter;
import com.mysema.codegen.JavaWriter;
import com.mysema.codegen.model.Type;
import com.mysema.codegen.model.TypeCategory;
import com.mysema.query.QueryException;
import com.mysema.query.annotations.PropertyType;
import com.mysema.query.annotations.QueryInit;
import com.mysema.query.annotations.QueryType;
import com.mysema.query.codegen.CodegenModule;
import com.mysema.query.codegen.EmbeddableSerializer;
import com.mysema.query.codegen.EntitySerializer;
import com.mysema.query.codegen.EntityType;
import com.mysema.query.codegen.Property;
import com.mysema.query.codegen.QueryTypeFactory;
import com.mysema.query.codegen.Serializer;
import com.mysema.query.codegen.SerializerConfig;
import com.mysema.query.codegen.Supertype;
import com.mysema.query.codegen.SupertypeSerializer;
import com.mysema.query.codegen.TypeFactory;
import com.mysema.query.codegen.TypeMappings;
import com.mysema.util.Annotations;
import com.mysema.util.ReflectionUtils;
/**
* AbstractDomainExporter is a common supertype for DomainExporters
*
* @author tiwe
*
*/
public abstract class AbstractDomainExporter {
private static final Logger logger = LoggerFactory.getLogger(HibernateDomainExporter.class);
private final File targetFolder;
private final Map, EntityType> allTypes = Maps.newHashMap();
private final Map, EntityType> entityTypes = Maps.newHashMap();
private final Map, EntityType> embeddableTypes = Maps.newHashMap();
private final Map, EntityType> superTypes = Maps.newHashMap();
private final Set serialized = new HashSet();
@SuppressWarnings("unchecked")
protected final TypeFactory typeFactory = new TypeFactory(Arrays.>asList(Entity.class,
javax.persistence.MappedSuperclass.class, Embeddable.class));
private final QueryTypeFactory queryTypeFactory;
private final TypeMappings typeMappings;
private final Serializer embeddableSerializer;
private final Serializer entitySerializer;
private final Serializer supertypeSerializer;
private final SerializerConfig serializerConfig;
private final Charset charset;
private final Set generatedFiles = new HashSet();
/**
* @param namePrefix
* @param nameSuffix
* @param targetFolder
* @param serializerConfig
* @param charset
*/
public AbstractDomainExporter(String namePrefix, String nameSuffix, File targetFolder,
SerializerConfig serializerConfig, Charset charset) {
this.targetFolder = targetFolder;
this.serializerConfig = serializerConfig;
this.charset = charset;
CodegenModule module = new CodegenModule();
module.bind(CodegenModule.PREFIX, namePrefix);
module.bind(CodegenModule.SUFFIX, nameSuffix);
module.bind(CodegenModule.KEYWORDS, Constants.keywords);
this.queryTypeFactory = module.get(QueryTypeFactory.class);
this.typeMappings = module.get(TypeMappings.class);
this.embeddableSerializer = module.get(EmbeddableSerializer.class);
this.entitySerializer = module.get(EntitySerializer.class);
this.supertypeSerializer = module.get(SupertypeSerializer.class);
}
/**
* Export the contents
*
* @throws IOException
*/
public void execute() throws IOException {
// collect types
try {
collectTypes();
} catch (Exception e) {
throw new QueryException(e);
}
// go through supertypes
Set additions = Sets.newHashSet();
for (Map.Entry, EntityType> entry : allTypes.entrySet()) {
EntityType entityType = entry.getValue();
if (entityType.getSuperType() != null && !allTypes.containsKey(entityType.getSuperType().getType().getJavaClass())) {
additions.add(entityType.getSuperType());
}
}
for (Supertype type : additions) {
type.setEntityType(createEntityType(type.getType(), this.superTypes));
}
// merge supertype fields into subtypes
Set handled = new HashSet();
for (EntityType type : superTypes.values()) {
addSupertypeFields(type, allTypes, handled);
}
for (EntityType type : entityTypes.values()) {
addSupertypeFields(type, allTypes, handled);
}
for (EntityType type : embeddableTypes.values()) {
addSupertypeFields(type, allTypes, handled);
}
// serialize them
serialize(superTypes, supertypeSerializer);
serialize(embeddableTypes, embeddableSerializer);
serialize(entityTypes, entitySerializer);
}
private void addSupertypeFields(EntityType model, Map, EntityType> superTypes,
Set handled) {
if (handled.add(model)) {
for (Supertype supertype : model.getSuperTypes()) {
EntityType entityType = superTypes.get(supertype.getType().getJavaClass());
if (entityType != null) {
addSupertypeFields(entityType, superTypes, handled);
supertype.setEntityType(entityType);
model.include(supertype);
}
}
}
}
protected abstract void collectTypes() throws Exception;
protected EntityType createEmbeddableType(Class cl) {
return createEntityType(cl, embeddableTypes);
}
protected EntityType createEmbeddableType(Type type) {
return createEntityType(type, embeddableTypes);
}
protected EntityType createEntityType(Class cl) {
return createEntityType(cl, entityTypes);
}
private EntityType createEntityType(Class cl, Map, EntityType> types) {
if (allTypes.containsKey(cl)) {
return allTypes.get(cl);
} else {
EntityType type = typeFactory.getEntityType(cl);
typeMappings.register(type, queryTypeFactory.create(type));
if (!cl.getSuperclass().equals(Object.class)) {
type.addSupertype(new Supertype(typeFactory.get(cl.getSuperclass(), cl.getGenericSuperclass())));
}
types.put(cl, type);
allTypes.put(cl, type);
return type;
}
}
protected EntityType createEntityType(Type type) {
return createEntityType(type, entityTypes);
}
protected EntityType createEntityType(Type type, Map, EntityType> types) {
Class key = type.getJavaClass();
if (allTypes.containsKey(key)) {
return allTypes.get(key);
} else {
EntityType entityType = new EntityType(type);
typeMappings.register(entityType, queryTypeFactory.create(entityType));
Class superClass = key.getSuperclass();
if (entityType.getSuperType() == null && superClass != null && !superClass.equals(Object.class)) {
entityType.addSupertype(new Supertype(typeFactory.get(superClass, key.getGenericSuperclass())));
}
types.put(key, entityType);
allTypes.put(key, entityType);
return entityType;
}
}
@Nullable
protected Type getTypeOverride(Type propertyType, AnnotatedElement annotated) {
if (annotated.isAnnotationPresent(QueryType.class)) {
QueryType queryType = annotated.getAnnotation(QueryType.class);
if (queryType.value().equals(PropertyType.NONE)) {
return null;
}
return propertyType.as(TypeCategory.valueOf(queryType.value().name()));
} else {
return propertyType;
}
}
protected Property createProperty(EntityType entityType, String propertyName, Type propertyType,
AnnotatedElement annotated) {
List inits = Collections.emptyList();
if (annotated.isAnnotationPresent(QueryInit.class)) {
inits = ImmutableList.copyOf(annotated.getAnnotation(QueryInit.class).value());
}
return new Property(entityType, propertyName, propertyType, inits);
}
protected EntityType createSuperType(Class cl) {
return createEntityType(cl, superTypes);
}
protected AnnotatedElement getAnnotatedElement(Class cl, String propertyName) throws NoSuchMethodException {
Field field = ReflectionUtils.getFieldOrNull(cl, propertyName);
Method method = ReflectionUtils.getGetterOrNull(cl, propertyName);
if (field != null) {
if (method != null) {
return new Annotations(field, method);
} else {
return field;
}
} else if (method != null) {
return method;
} else {
throw new IllegalArgumentException("No property found for " + cl.getName() + "." + propertyName);
}
}
public Set getGeneratedFiles() {
return generatedFiles;
}
protected Type getType(Class cl, Class mappedType, String propertyName) throws NoSuchMethodException {
Field field = ReflectionUtils.getFieldOrNull(cl, propertyName);
if (field != null) {
if (mappedType.isAssignableFrom(field.getType())) {
return typeFactory.get(field.getType(), field.getGenericType());
} else {
return typeFactory.get(mappedType);
}
} else {
Method method = ReflectionUtils.getGetterOrNull(cl, propertyName);
if (method != null) {
if (mappedType.isAssignableFrom(method.getReturnType())) {
return typeFactory.get(method.getReturnType(), method.getGenericReturnType());
} else {
return typeFactory.get(mappedType);
}
} else {
throw new IllegalArgumentException("No property found for " + cl.getName() + "." + propertyName);
}
}
}
private void serialize(Map, EntityType> types, Serializer serializer) throws IOException {
for (EntityType entityType : types.values()) {
if (serialized.add(entityType)) {
Type type = typeMappings.getPathType(entityType, entityType, true);
String packageName = type.getPackageName();
String className = packageName.length() > 0 ? (packageName + "." + type.getSimpleName()) : type.getSimpleName();
write(serializer, className.replace('.', '/') + ".java", entityType);
}
}
}
private void write(Serializer serializer, String path, EntityType type) throws IOException {
File targetFile = new File(targetFolder, path);
generatedFiles.add(targetFile);
Writer w = writerFor(targetFile);
try{
CodeWriter writer = new JavaWriter(w);
serializer.serialize(type, serializerConfig, writer);
}finally{
w.close();
}
}
private Writer writerFor(File file) {
if (!file.getParentFile().exists() && !file.getParentFile().mkdirs()) {
logger.error("Folder " + file.getParent() + " could not be created");
}
try {
return new OutputStreamWriter(new FileOutputStream(file), charset);
} catch (FileNotFoundException e) {
throw new RuntimeException(e.getMessage(), e);
}
}
public void setUnknownAsEntity(boolean unknownAsEntity) {
typeFactory.setUnknownAsEntity(unknownAsEntity);
}
}