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Spring Data module to provide sophisticated support for JPA repositories
/*
* Copyright 2008-2011 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.domain;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
/**
* Helper class to easily combine {@link Specification} instances.
*
* @author Oliver Gierke
*/
public class Specifications implements Specification {
private final Specification spec;
/**
* Creates a new {@link Specifications} wrapper for the given {@link Specification}.
*
* @param spec
*/
private Specifications(Specification spec) {
this.spec = spec;
}
/**
* Simple static factory method to add some syntactic sugar around a {@link Specification}.
*
* @param
* @param spec
* @return
*/
public static Specifications where(Specification spec) {
return new Specifications(spec);
}
/**
* ANDs the given {@link Specification} to the current one.
*
* @param other
* @return
*/
public Specifications and(final Specification other) {
return new Specifications(new Specification() {
public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder) {
return builder.and(spec.toPredicate(root, query, builder), other.toPredicate(root, query, builder));
}
});
}
/**
* ORs the given specification to the current one.
*
* @param other
* @return
*/
public Specifications or(final Specification other) {
return new Specifications(new Specification() {
public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder) {
return builder.or(spec.toPredicate(root, query, builder), other.toPredicate(root, query, builder));
}
});
}
/**
* Negates the given {@link Specification}.
*
* @param
* @param spec
* @return
*/
public static Specifications not(final Specification spec) {
return new Specifications(spec) {
@Override
public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder) {
return builder.not(spec.toPredicate(root, query, builder));
}
};
}
/*
* (non-Javadoc)
*
* @see org.springframework.data.jpa.domain.Specification#toPredicate(javax.
* persistence.criteria.Root, javax.persistence.criteria.CriteriaQuery,
* javax.persistence.criteria.CriteriaBuilder)
*/
public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder) {
return spec.toPredicate(root, query, builder);
}
}