/*
* Copyright 2016-2017 the original author or authors.
*
* 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 org.springframework.data.mongodb.config;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.data.annotation.Persistent;
import org.springframework.data.convert.CustomConversions;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.mapping.context.MappingContextIsNewStrategyFactory;
import org.springframework.data.mapping.context.PersistentEntities;
import org.springframework.data.mapping.model.CamelCaseAbbreviatingFieldNamingStrategy;
import org.springframework.data.mapping.model.FieldNamingStrategy;
import org.springframework.data.mapping.model.PropertyNameFieldNamingStrategy;
import org.springframework.data.mongodb.core.convert.MongoCustomConversions;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
import org.springframework.data.support.CachingIsNewStrategyFactory;
import org.springframework.data.support.IsNewStrategyFactory;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;
/**
* Base class for Spring Data MongoDB to be extended for JavaConfiguration usage.
*
* @author Mark Paluch
* @since 2.0
*/
public abstract class MongoConfigurationSupport {
/**
* Return the name of the database to connect to.
*
* @return must not be {@literal null}.
*/
protected abstract String getDatabaseName();
/**
* Returns the base packages to scan for MongoDB mapped entities at startup. Will return the package name of the
* configuration class' (the concrete class, not this one here) by default. So if you have a
* {@code com.acme.AppConfig} extending {@link MongoConfigurationSupport} the base package will be considered
* {@code com.acme} unless the method is overridden to implement alternate behavior.
*
* @return the base packages to scan for mapped {@link Document} classes or an empty collection to not enable scanning
* for entities.
* @since 1.10
*/
protected Collection<String> getMappingBasePackages() {
Package mappingBasePackage = getClass().getPackage();
return Collections.singleton(mappingBasePackage == null ? null : mappingBasePackage.getName());
}
/**
* Creates a {@link MongoMappingContext} equipped with entity classes scanned from the mapping base package.
*
* @see #getMappingBasePackages()
* @return
* @throws ClassNotFoundException
*/
@Bean
public MongoMappingContext mongoMappingContext() throws ClassNotFoundException {
MongoMappingContext mappingContext = new MongoMappingContext();
mappingContext.setInitialEntitySet(getInitialEntitySet());
mappingContext.setSimpleTypeHolder(customConversions().getSimpleTypeHolder());
mappingContext.setFieldNamingStrategy(fieldNamingStrategy());
return mappingContext;
}
/**
* Returns a {@link MappingContextIsNewStrategyFactory} wrapped into a {@link CachingIsNewStrategyFactory}.
*
* @return
* @throws ClassNotFoundException
*/
@Bean
public IsNewStrategyFactory isNewStrategyFactory() throws ClassNotFoundException {
return new CachingIsNewStrategyFactory(new MappingContextIsNewStrategyFactory(
new PersistentEntities(Arrays.<MappingContext<?, ?>> asList(new MappingContext[] { mongoMappingContext() }))));
}
/**
* Register custom {@link Converter}s in a {@link CustomConversions} object if required. These
* {@link CustomConversions} will be registered with the {@link #mappingMongoConverter()} and
* {@link #mongoMappingContext()}. Returns an empty {@link MongoCustomConversions} instance by default.
*
* @return must not be {@literal null}.
*/
@Bean
public CustomConversions customConversions() {
return new MongoCustomConversions(Collections.emptyList());
}
/**
* Scans the mapping base package for classes annotated with {@link Document}. By default, it scans for entities in
* all packages returned by {@link #getMappingBasePackages()}.
*
* @see #getMappingBasePackages()
* @return
* @throws ClassNotFoundException
*/
protected Set<Class<?>> getInitialEntitySet() throws ClassNotFoundException {
Set<Class<?>> initialEntitySet = new HashSet<Class<?>>();
for (String basePackage : getMappingBasePackages()) {
initialEntitySet.addAll(scanForEntities(basePackage));
}
return initialEntitySet;
}
/**
* Scans the given base package for entities, i.e. MongoDB specific types annotated with {@link Document} and
* {@link Persistent}.
*
* @param basePackage must not be {@literal null}.
* @return
* @throws ClassNotFoundException
* @since 1.10
*/
protected Set<Class<?>> scanForEntities(String basePackage) throws ClassNotFoundException {
if (!StringUtils.hasText(basePackage)) {
return Collections.emptySet();
}
Set<Class<?>> initialEntitySet = new HashSet<Class<?>>();
if (StringUtils.hasText(basePackage)) {
ClassPathScanningCandidateComponentProvider componentProvider = new ClassPathScanningCandidateComponentProvider(
false);
componentProvider.addIncludeFilter(new AnnotationTypeFilter(Document.class));
componentProvider.addIncludeFilter(new AnnotationTypeFilter(Persistent.class));
for (BeanDefinition candidate : componentProvider.findCandidateComponents(basePackage)) {
initialEntitySet
.add(ClassUtils.forName(candidate.getBeanClassName(), MongoConfigurationSupport.class.getClassLoader()));
}
}
return initialEntitySet;
}
/**
* Configures whether to abbreviate field names for domain objects by configuring a
* {@link CamelCaseAbbreviatingFieldNamingStrategy} on the {@link MongoMappingContext} instance created. For advanced
* customization needs, consider overriding {@link #mappingMongoConverter()}.
*
* @return
*/
protected boolean abbreviateFieldNames() {
return false;
}
/**
* Configures a {@link FieldNamingStrategy} on the {@link MongoMappingContext} instance created.
*
* @return
* @since 1.5
*/
protected FieldNamingStrategy fieldNamingStrategy() {
return abbreviateFieldNames() ? new CamelCaseAbbreviatingFieldNamingStrategy()
: PropertyNameFieldNamingStrategy.INSTANCE;
}
}