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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
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package org.apache.deltaspike.data.impl.criteria;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.From;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Selection;
import javax.persistence.metamodel.CollectionAttribute;
import javax.persistence.metamodel.ListAttribute;
import javax.persistence.metamodel.MapAttribute;
import javax.persistence.metamodel.PluralAttribute;
import javax.persistence.metamodel.SetAttribute;
import javax.persistence.metamodel.SingularAttribute;
import org.apache.deltaspike.data.api.criteria.Criteria;
import org.apache.deltaspike.data.api.criteria.QuerySelection;
import org.apache.deltaspike.data.impl.builder.OrderDirection;
import org.apache.deltaspike.data.impl.criteria.predicate.Between;
import org.apache.deltaspike.data.impl.criteria.predicate.Eq;
import org.apache.deltaspike.data.impl.criteria.predicate.EqIgnoreCase;
import org.apache.deltaspike.data.impl.criteria.predicate.FetchBuilder;
import org.apache.deltaspike.data.impl.criteria.predicate.GreaterThan;
import org.apache.deltaspike.data.impl.criteria.predicate.GreaterThanOrEqual;
import org.apache.deltaspike.data.impl.criteria.predicate.In;
import org.apache.deltaspike.data.impl.criteria.predicate.IsEmpty;
import org.apache.deltaspike.data.impl.criteria.predicate.IsNotEmpty;
import org.apache.deltaspike.data.impl.criteria.predicate.IsNotNull;
import org.apache.deltaspike.data.impl.criteria.predicate.IsNull;
import org.apache.deltaspike.data.impl.criteria.predicate.JoinBuilder;
import org.apache.deltaspike.data.impl.criteria.predicate.LessThan;
import org.apache.deltaspike.data.impl.criteria.predicate.LessThanOrEqual;
import org.apache.deltaspike.data.impl.criteria.predicate.Like;
import org.apache.deltaspike.data.impl.criteria.predicate.NotEq;
import org.apache.deltaspike.data.impl.criteria.predicate.NotEqIgnoreCase;
import org.apache.deltaspike.data.impl.criteria.predicate.NotLike;
import org.apache.deltaspike.data.impl.criteria.predicate.OrBuilder;
import org.apache.deltaspike.data.impl.criteria.predicate.PredicateBuilder;
import org.apache.deltaspike.data.impl.criteria.processor.OrderBy;
import org.apache.deltaspike.data.impl.criteria.processor.QueryProcessor;
public class QueryCriteria<C, R> implements Criteria<C, R>
{
private static final Logger log = Logger.getLogger(QueryCriteria.class.getName());
private EntityManager entityManager;
private Class<C> entityClass;
private Class<R> resultClass;
private JoinType joinType;
private final boolean ignoreNull = true;
private boolean distinct = false;
private final OrderBy<C> orderByProcessor = new OrderBy<C>();
private final List<PredicateBuilder<C>> builders = new LinkedList<PredicateBuilder<C>>();
private final List<QueryProcessor<C>> processors = new LinkedList<QueryProcessor<C>>();
private final List<QuerySelection<? super C, ?>> selections = new LinkedList<QuerySelection<? super C, ?>>();
public QueryCriteria(Class<C> entityClass, Class<R> resultClass, EntityManager entityManager)
{
this(entityClass, resultClass, entityManager, null);
}
public QueryCriteria(Class<C> entityClass, Class<R> resultClass, EntityManager entityManager, JoinType joinType)
{
this.entityManager = entityManager;
this.entityClass = entityClass;
this.resultClass = resultClass;
this.joinType = joinType;
}
// --------------------------------------------------------------------
// Public criteria methods
// --------------------------------------------------------------------
@Override
public List<R> getResultList()
{
return createQuery().getResultList();
}
@Override
public R getSingleResult()
{
return createQuery().getSingleResult();
}
@Override
public R getOptionalResult()
{
try
{
return getSingleResult();
}
catch (NoResultException e)
{
return null;
}
}
@Override
public R getAnyResult()
{
List<R> queryResult = getResultList();
return !queryResult.isEmpty() ? queryResult.get(0) : null;
}
@Override
public TypedQuery<R> createQuery()
{
try
{
CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<R> query = createCriteriaQuery(builder);
From<C, C> root = query.from(entityClass);
if (selections.size() == 1)
{
Selection<?>[] selections = prepareSelections(query, builder, root);
query.select((Selection<? extends R>) selections[0]);
}
if (selections.size() > 1)
{
query.multiselect(prepareSelections(query, builder, root));
}
List<Predicate> predicates = predicates(builder, root);
query.distinct(distinct);
if (!predicates.isEmpty())
{
query.where(predicates.toArray(new Predicate[predicates.size()]));
}
applyProcessors(query, builder, root);
return (TypedQuery<R>) entityManager.createQuery(query);
}
catch (RuntimeException e)
{
log.log(Level.SEVERE, "Exception while creating JPA query", e);
throw e;
}
}
@Override
public Criteria<C, R> or(Criteria<C, R>... criteria)
{
return internalOr(criteria);
}
@Override
@SuppressWarnings("unchecked")
public Criteria<C, R> or(Collection<Criteria<C, R>> criteria)
{
return internalOr(criteria.toArray(new Criteria[criteria.size()]));
}
@Override
public <P, E> Criteria<C, R> join(SingularAttribute<? super C, P> att, Criteria<P, P> criteria)
{
add(new JoinBuilder<C, P, E>(criteria, joinType, att));
return this;
}
@Override
public <P, E> Criteria<C, R> join(ListAttribute<? super C, P> att, Criteria<P, P> criteria)
{
add(new JoinBuilder<C, P, E>(criteria, joinType, att));
return this;
}
@Override
public <P, E> Criteria<C, R> join(CollectionAttribute<? super C, P> att, Criteria<P, P> criteria)
{
add(new JoinBuilder<C, P, E>(criteria, joinType, att));
return this;
}
@Override
public <P, E> Criteria<C, R> join(SetAttribute<? super C, P> att, Criteria<P, P> criteria)
{
add(new JoinBuilder<C, P, E>(criteria, joinType, att));
return this;
}
@Override
public <P, E> Criteria<C, R> join(MapAttribute<? super C, E, P> att, Criteria<P, P> criteria)
{
add(new JoinBuilder<C, P, E>(criteria, joinType, att));
return this;
}
@Override
public <P, E> Criteria<C, R> fetch(SingularAttribute<? super C, P> att)
{
add(new FetchBuilder<C, P, E>(att, null));
return this;
}
@Override
public <P, E> Criteria<C, R> fetch(SingularAttribute<? super C, P> att, JoinType joinType)
{
add(new FetchBuilder<C, P, E>(att, joinType));
return this;
}
@Override
public <P, E> Criteria<C, R> fetch(PluralAttribute<? super C, P, E> att)
{
add(new FetchBuilder<C, P, E>(att, null));
return this;
}
@Override
public <P, E> Criteria<C, R> fetch(PluralAttribute<? super C, P, E> att, JoinType joinType)
{
add(new FetchBuilder<C, P, E>(att, joinType));
return this;
}
@Override
public <P> Criteria<C, R> orderAsc(SingularAttribute<? super C, P> att)
{
addOrderBy(att, OrderDirection.ASC);
return this;
}
@Override
public <P> Criteria<C, R> orderDesc(SingularAttribute<? super C, P> att)
{
addOrderBy(att, OrderDirection.DESC);
return this;
}
@Override
public Criteria<C, R> distinct()
{
distinct = true;
return this;
}
@Override
public <N> Criteria<C, N> select(Class<N> resultClass, QuerySelection<? super C, ?>... selection)
{
QueryCriteria<C, N> result = new QueryCriteria<C, N>(entityClass, resultClass, entityManager, joinType);
result.builders.addAll(this.builders);
result.distinct = this.distinct;
result.processors.addAll(this.processors);
result.selections.addAll(Arrays.asList(selection));
return result;
}
@Override
public Criteria<C, Object[]> select(QuerySelection<? super C, ?>... selection)
{
return select(Object[].class, selection);
}
@Override
public List<Predicate> predicates(CriteriaBuilder builder, Path<C> path)
{
List<Predicate> predicates = new LinkedList<Predicate>();
for (PredicateBuilder<C> pbuilder : builders)
{
List<Predicate> p = pbuilder.build(builder, path);
predicates.addAll(p);
}
return predicates;
}
// --------------------------------------------------------------------
// Package criteria methods
// --------------------------------------------------------------------
void applyProcessors(CriteriaQuery<?> query, CriteriaBuilder builder, From<C, C> from)
{
orderByProcessor.process(query, builder, from);
for (QueryProcessor<C> proc : processors)
{
proc.process(query, builder, from);
}
}
@SuppressWarnings("unchecked")
Criteria<C, R> internalOr(Criteria<C, R>... others)
{
List<Criteria<C, R>> list = new LinkedList<Criteria<C, R>>();
list.addAll(Arrays.asList(others));
add(new OrBuilder<C>(list.toArray(new Criteria[list.size()])));
return this;
}
// --------------------------------------------------------------------
// Private criteria methods
// --------------------------------------------------------------------
private void add(PredicateBuilder<C> pred)
{
builders.add(pred);
}
private <P> void add(PredicateBuilder<C> pred, P value)
{
if (ignoreNull && value != null)
{
builders.add(pred);
}
else if (!ignoreNull)
{
builders.add(pred);
}
}
private <P> void addOrderBy(SingularAttribute<? super C, P> att, OrderDirection orderDirection)
{
orderByProcessor.add(att, orderDirection);
}
private Selection<?>[] prepareSelections(CriteriaQuery<?> query, CriteriaBuilder builder, From<C, C> root)
{
List<Selection<?>> result = new ArrayList<Selection<?>>(selections.size());
for (QuerySelection<? super C, ?> selection : selections)
{
result.add(selection.toSelection(query, builder, root));
}
return result.toArray(new Selection<?>[] {});
}
private CriteriaQuery<R> createCriteriaQuery(CriteriaBuilder builder)
{
return builder.createQuery(resultClass);
}
// --------------------------------------------------------------------
// Predicates
// --------------------------------------------------------------------
@Override
public <P> Criteria<C, R> eq(SingularAttribute<? super C, P> att, P value)
{
add(new Eq<C, P>(att, value), value);
return this;
}
@Override
public <P> Criteria<C, R> eqIgnoreCase(SingularAttribute<? super C, String> att, String value)
{
add(new EqIgnoreCase<C>(att, value), value);
return this;
}
@Override
public <P> Criteria<C, R> notEq(SingularAttribute<? super C, P> att, P value)
{
add(new NotEq<C, P>(att, value), value);
return this;
}
@Override
public <P> Criteria<C, R> notEqIgnoreCase(SingularAttribute<? super C, String> att, String value)
{
add(new NotEqIgnoreCase<C>(att, value), value);
return this;
}
@Override
public <P> Criteria<C, R> like(SingularAttribute<? super C, String> att, String value)
{
add(new Like<C>(att, value), value);
return this;
}
@Override
public <P> Criteria<C, R> likeIgnoreCase(SingularAttribute<? super C, String> att, String value)
{
add(new Like<C>(att, value, true), value);
return this;
}
@Override
public <P> Criteria<C, R> notLike(SingularAttribute<? super C, String> att, String value)
{
add(new NotLike<C>(att, value), value);
return this;
}
@Override
public <P> Criteria<C, R> notLikeIgnoreCase(SingularAttribute<? super C, String> att, String value)
{
add(new NotLike<C>(att, value, true), value);
return this;
}
@Override
public <P extends Comparable<? super P>> Criteria<C, R> lt(SingularAttribute<? super C, P> att, P value)
{
add(new LessThan<C, P>(att, value), value);
return this;
}
@Override
public <P extends Comparable<? super P>> Criteria<C, R> ltOrEq(SingularAttribute<? super C, P> att, P value)
{
add(new LessThanOrEqual<C, P>(att, value), value);
return this;
}
@Override
public <P extends Comparable<? super P>> Criteria<C, R> gt(SingularAttribute<? super C, P> att, P value)
{
add(new GreaterThan<C, P>(att, value), value);
return this;
}
@Override
public <P extends Comparable<? super P>> Criteria<C, R> gtOrEq(SingularAttribute<? super C, P> att, P value)
{
add(new GreaterThanOrEqual<C, P>(att, value), value);
return this;
}
@Override
public <P extends Comparable<? super P>> Criteria<C, R> between(SingularAttribute<? super C, P> att, P lower,
P upper)
{
add(new Between<C, P>(att, lower, upper));
return this;
}
@Override
public <P> Criteria<C, R> isNull(SingularAttribute<? super C, P> att)
{
add(new IsNull<C, P>(att));
return this;
}
@Override
public <P> Criteria<C, R> notNull(SingularAttribute<? super C, P> att)
{
add(new IsNotNull<C, P>(att));
return this;
}
@Override
public <P extends Collection<?>> Criteria<C, R> empty(SingularAttribute<? super C, P> att)
{
add(new IsEmpty<C, P>(att));
return this;
}
@Override
public <P extends Collection<?>> Criteria<C, R> notEmpty(SingularAttribute<? super C, P> att)
{
add(new IsNotEmpty<C, P>(att));
return this;
}
@Override
public <P> Criteria<C, R> in(SingularAttribute<? super C, P> att, P... values)
{
add(new In<C, P>(att, values), values);
return this;
}
}