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JPA Codegen support 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.querydsl.jpa.codegen;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.AnnotatedElement;
import java.nio.charset.Charset;
import java.util.Map;
import javax.persistence.Temporal;
import javax.persistence.metamodel.*;
import javax.xml.stream.XMLStreamException;
import org.hibernate.MappingException;
import com.google.common.collect.Maps;
import com.mysema.codegen.model.SimpleType;
import com.mysema.codegen.model.Type;
import com.mysema.codegen.model.TypeCategory;
import com.querydsl.codegen.EntityType;
import com.querydsl.codegen.Property;
import com.querydsl.codegen.SerializerConfig;
import com.querydsl.codegen.SimpleSerializerConfig;
/**
* {@code JPADomainExporter} exports JPA 2 metamodels to Querydsl expression types
*
* @author tiwe
*
*/
public class JPADomainExporter extends AbstractDomainExporter {
private final Metamodel metamodel;
/**
* Create a new JPADomainExporter instance
*
* @param targetFolder target folder
* @param metamodel metamodel
*/
public JPADomainExporter(File targetFolder, Metamodel metamodel) {
this("Q", "", targetFolder, SimpleSerializerConfig.DEFAULT, metamodel,
Charset.defaultCharset());
}
/**
* Create a new JPADomainExporter instance
*
* @param namePrefix name prefix (default: Q)
* @param targetFolder target folder
* @param metamodel metamodel
*/
public JPADomainExporter(String namePrefix, File targetFolder, Metamodel metamodel) {
this(namePrefix, "", targetFolder, SimpleSerializerConfig.DEFAULT, metamodel,
Charset.defaultCharset());
}
/**
* Create a new JPADomainExporter instance
*
* @param namePrefix name prefix (default: Q)
* @param targetFolder target folder
* @param metamodel metamodel
* @param charset charset (default: system charset)
*/
public JPADomainExporter(String namePrefix, File targetFolder, Metamodel metamodel,
Charset charset) {
this(namePrefix, "", targetFolder, SimpleSerializerConfig.DEFAULT, metamodel, charset);
}
/**
* Create a new JPADomainExporter instance
*
* @param namePrefix name prefix (default: Q)
* @param nameSuffix name suffix
* @param targetFolder target folder
* @param metamodel metamodel
*/
public JPADomainExporter(String namePrefix, String nameSuffix, File targetFolder,
Metamodel metamodel) {
this(namePrefix, nameSuffix, targetFolder, SimpleSerializerConfig.DEFAULT, metamodel,
Charset.defaultCharset());
}
/**
* Create a new JPADomainExporter instance
*
* @param namePrefix name prefix (default: Q)
* @param targetFolder target folder
* @param serializerConfig serializer config
* @param metamodel metamodel
*/
public JPADomainExporter(String namePrefix, File targetFolder,
SerializerConfig serializerConfig, Metamodel metamodel) {
this(namePrefix, "", targetFolder, serializerConfig, metamodel, Charset.defaultCharset());
}
/**
* Create a new JPADomainExporter instance
*
* @param namePrefix name prefix (default: Q)
* @param targetFolder target folder
* @param serializerConfig serializer config
* @param metamodel metamodel
* @param charset charset (default: system charset)
*/
public JPADomainExporter(String namePrefix, File targetFolder,
SerializerConfig serializerConfig, Metamodel metamodel, Charset charset) {
this(namePrefix, "", targetFolder, serializerConfig, metamodel, charset);
}
/**
* Create a new JPADomainExporter instance
*
* @param namePrefix name prefix (default: Q)
* @param nameSuffix name suffix (default: empty)
* @param targetFolder target folder
* @param serializerConfig serializer config
* @param metamodel metamodel
* @param charset charset (default: system charset)
*/
public JPADomainExporter(String namePrefix, String nameSuffix, File targetFolder,
SerializerConfig serializerConfig, Metamodel metamodel, Charset charset) {
super(namePrefix, nameSuffix, targetFolder, serializerConfig, charset);
this.metamodel = metamodel;
}
@Override
protected void collectTypes() throws IOException, XMLStreamException, ClassNotFoundException,
NoSuchMethodException {
Map, EntityType> types = Maps.newHashMap();
for (ManagedType managedType : metamodel.getManagedTypes()) {
if (managedType instanceof MappedSuperclassType) {
types.put(managedType, createSuperType(managedType.getJavaType()));
} else if (managedType instanceof javax.persistence.metamodel.EntityType) {
types.put(managedType, createEntityType(managedType.getJavaType()));
} else if (managedType instanceof EmbeddableType) {
types.put(managedType, createEmbeddableType(managedType.getJavaType()));
} else {
throw new IllegalArgumentException("Unknown type " + managedType);
}
}
// handle properties
for (Map.Entry, EntityType> entry : types.entrySet()) {
EntityType entityType = entry.getValue();
for (Attribute attribute : entry.getKey().getDeclaredAttributes()) {
handleProperty(entityType, entityType.getJavaClass(), attribute);
}
}
}
private void handleProperty(EntityType entityType, Class cl, Attribute p)
throws NoSuchMethodException, ClassNotFoundException {
Class clazz = Object.class;
try {
clazz = p.getJavaType();
} catch (MappingException e) {
// ignore
}
Type propertyType = getType(cl, clazz, p.getName());
AnnotatedElement annotated = getAnnotatedElement(cl, p.getName());
propertyType = getTypeOverride(propertyType, annotated);
if (propertyType == null) {
return;
}
if (p.isCollection()) {
if (p instanceof MapAttribute) {
MapAttribute map = (MapAttribute) p;
Type keyType = typeFactory.get(map.getKeyJavaType());
Type valueType = typeFactory.get(map.getElementType().getJavaType());
valueType = getPropertyType(p, valueType);
propertyType = new SimpleType(propertyType,
normalize(propertyType.getParameters().get(0), keyType),
normalize(propertyType.getParameters().get(1), valueType));
} else {
Type valueType = typeFactory.get(((PluralAttribute) p).getElementType().getJavaType());
valueType = getPropertyType(p, valueType);
propertyType = new SimpleType(propertyType,
normalize(propertyType.getParameters().get(0), valueType));
}
} else {
propertyType = getPropertyType(p, propertyType);
}
Property property = createProperty(entityType, p.getName(), propertyType, annotated);
entityType.addProperty(property);
}
private Type getPropertyType(Attribute p, Type propertyType) {
Temporal temporal = ((AnnotatedElement) p.getJavaMember()).getAnnotation(Temporal.class);
if (temporal != null) {
switch (temporal.value()) {
case DATE: propertyType = propertyType.as(TypeCategory.DATE); break;
case TIME: propertyType = propertyType.as(TypeCategory.TIME); break;
case TIMESTAMP: propertyType = propertyType.as(TypeCategory.DATETIME); break;
}
}
return propertyType;
}
}