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Spring Data module for JPA repositories.
/*
* Copyright 2015 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.jpa.repository.support;
import java.util.List;
import java.util.Set;
import javax.persistence.EntityManager;
import javax.persistence.metamodel.ManagedType;
import org.springframework.data.jpa.repository.JpaContext;
import org.springframework.util.Assert;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* Default implementation of {@link JpaContext}.
*
* @author Oliver Gierke
* @soundtrack Marcus Miller - Son Of Macbeth (Afrodeezia)
* @since 1.9
*/
public class DefaultJpaContext implements JpaContext {
private final MultiValueMap, EntityManager> entityManagers;
/**
* Creates a new {@link DefaultJpaContext} for the given {@link Set} of {@link EntityManager}s.
*
* @param entityManagers must not be {@literal null}.
*/
public DefaultJpaContext(Set entityManagers) {
Assert.notNull(entityManagers, "EntityManagers must not be null!");
Assert.notEmpty(entityManagers, "EntityManagers must not be empty!");
this.entityManagers = new LinkedMultiValueMap, EntityManager>();
for (EntityManager em : entityManagers) {
for (ManagedType managedType : em.getMetamodel().getManagedTypes()) {
this.entityManagers.add(managedType.getJavaType(), em);
}
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.jpa.repository.JpaContext#getByManagedType(java.lang.Class)
*/
@Override
public EntityManager getEntityManagerByManagedType(Class type) {
Assert.notNull(type, "Type must not be null!");
if (!entityManagers.containsKey(type)) {
throw new IllegalArgumentException(String.format("%s is not a managed type!", type));
}
List candidates = this.entityManagers.get(type);
if (candidates.size() == 1) {
return candidates.get(0);
}
throw new IllegalArgumentException(
String.format("%s managed by more than one EntityManagers: %s!", type.getName(), candidates));
}
}