/*
* Copyright 2011, Mysema Ltd
*
* 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.mysema.query.jpa.impl;
import javax.annotation.Nullable;
import javax.persistence.EntityManager;
import javax.persistence.LockModeType;
import javax.persistence.Query;
import java.util.Map;
import com.mysema.query.JoinType;
import com.mysema.query.dml.DeleteClause;
import com.mysema.query.jpa.JPAQueryMixin;
import com.mysema.query.jpa.JPQLSerializer;
import com.mysema.query.jpa.JPQLTemplates;
import com.mysema.query.support.QueryMixin;
import com.mysema.query.types.EntityPath;
import com.mysema.query.types.Predicate;
/**
* DeleteClause implementation for JPA
*
* @author tiwe
*
*/
public class JPADeleteClause implements DeleteClause<JPADeleteClause> {
private final QueryMixin queryMixin = new JPAQueryMixin();
private final EntityManager entityManager;
private final JPQLTemplates templates;
@Nullable
private LockModeType lockMode;
public JPADeleteClause(EntityManager em, EntityPath<?> entity) {
this(em, entity, JPAProvider.getTemplates(em));
}
public JPADeleteClause(EntityManager entityManager, EntityPath<?> entity, JPQLTemplates templates) {
this.entityManager = entityManager;
this.templates = templates;
queryMixin.addJoin(JoinType.DEFAULT, entity);
}
@Override
public long execute() {
JPQLSerializer serializer = new JPQLSerializer(templates, entityManager);
serializer.serializeForDelete(queryMixin.getMetadata());
Map<Object,String> constants = serializer.getConstantToLabel();
Query query = entityManager.createQuery(serializer.toString());
if (lockMode != null) {
query.setLockMode(lockMode);
}
JPAUtil.setConstants(query, constants, queryMixin.getMetadata().getParams());
return query.executeUpdate();
}
@Override
public JPADeleteClause where(Predicate... o) {
for (Predicate p : o) {
queryMixin.where(p);
}
return this;
}
public JPADeleteClause setLockMode(LockModeType lockMode) {
this.lockMode = lockMode;
return this;
}
@Override
public String toString() {
JPQLSerializer serializer = new JPQLSerializer(templates, entityManager);
serializer.serializeForDelete(queryMixin.getMetadata());
return serializer.toString();
}
}