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Spring Data module for JPA repositories.
/*
* Copyright 2014-2015 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;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.persistence.NamedAttributeNode;
import org.springframework.data.jpa.repository.query.JpaQueryMethod;
/**
* Annotation to configure the JPA 2.1 {@link javax.persistence.EntityGraph}s that should be used on repository methods.
*
* Since 1.9 we support the definition of dynamic {@link EntityGraph}s by allowing to customize the fetch-graph via
* via {@link #attributePaths()} ad-hoc fetch-graph configuration.
*
* If {@link #attributePaths()} are specified then we ignore the entity-graph name {@link #value()}
* and treat this {@link EntityGraph} as dynamic.
*
* @author Thomas Darimont
* @since 1.6
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@Documented
public @interface EntityGraph {
/**
* The name of the EntityGraph to use.
* If empty we fall-back to {@link JpaQueryMethod#getNamedQueryName()} as the value.
*
* @return
*/
String value() default "";
/**
* The {@link Type} of the EntityGraph to use, defaults to {@link Type#FETCH}.
*
* @return
*/
EntityGraphType type() default EntityGraphType.FETCH;
/**
* The paths of attributes of this {@link EntityGraph} to use, empty by default.
*
* You can refer to direct properties of the entity or nested properties via a {@code property.nestedProperty}.
*
* @return
* @since 1.9
*/
String[] attributePaths() default {};
/**
* Enum for JPA 2.1 {@link javax.persistence.EntityGraph} types.
*
* @author Thomas Darimont
* @since 1.6
*/
public enum EntityGraphType {
/**
* When the javax.persistence.loadgraph property is used to specify an entity graph, attributes that are specified
* by attribute nodes of the entity graph are treated as FetchType.EAGER and attributes that are not specified are
* treated according to their specified or default FetchType.
*
* @see JPA 2.1 Specification: 3.7.4.2 Load Graph Semantics
*/
LOAD("javax.persistence.loadgraph"),
/**
* When the javax.persistence.fetchgraph property is used to specify an entity graph, attributes that are specified
* by attribute nodes of the entity graph are treated as FetchType.EAGER and attributes that are not specified are
* treated as FetchType.LAZY
*
* @see JPA 2.1 Specification: 3.7.4.1 Fetch Graph Semantics
*/
FETCH("javax.persistence.fetchgraph");
private final String key;
private EntityGraphType(String value) {
this.key = value;
}
public String getKey() {
return key;
}
}
}