/*
* Copyright 2014 - 2017 Blazebit.
*
* 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.blazebit.persistence.criteria.impl.path;
import com.blazebit.persistence.criteria.BlazeCollectionJoin;
import com.blazebit.persistence.criteria.impl.BlazeCriteriaBuilderImpl;
import com.blazebit.persistence.criteria.impl.RenderContext;
import com.blazebit.persistence.criteria.impl.expression.SubqueryExpression;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.Predicate;
import javax.persistence.metamodel.CollectionAttribute;
import javax.persistence.metamodel.EntityType;
import javax.persistence.metamodel.ManagedType;
import java.util.Collection;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class CollectionAttributeJoin<O, E> extends AbstractPluralAttributeJoin<O, Collection<E>, E> implements BlazeCollectionJoin<O, E> {
private static final long serialVersionUID = 1L;
private CollectionAttributeJoin(BlazeCriteriaBuilderImpl criteriaBuilder, CollectionAttributeJoin<O, ? super E> original, EntityType<E> treatType) {
super(criteriaBuilder, original, treatType);
}
public CollectionAttributeJoin(BlazeCriteriaBuilderImpl criteriaBuilder, Class<E> javaType, AbstractPath<O> pathSource, CollectionAttribute<? super O, E> joinAttribute, JoinType joinType) {
super(criteriaBuilder, javaType, pathSource, joinAttribute, joinType);
}
@Override
public final CollectionAttributeJoin<O, E> correlateTo(SubqueryExpression<?> subquery) {
return (CollectionAttributeJoin<O, E>) super.correlateTo(subquery);
}
@Override
@SuppressWarnings({"unchecked"})
public CollectionAttribute<? super O, E> getAttribute() {
return (CollectionAttribute<? super O, E>) super.getAttribute();
}
@Override
public CollectionAttribute<? super O, E> getModel() {
return getAttribute();
}
@Override
@SuppressWarnings({"unchecked"})
protected AbstractFrom<O, E> createCorrelationDelegate() {
return new CollectionAttributeJoin<O, E>(criteriaBuilder, getJavaType(), (AbstractPath<O>) getParentPath(), getAttribute(), getJoinType());
}
/* JPA 2.1 support */
@Override
public CollectionAttributeJoin<O, E> on(Expression<Boolean> restriction) {
super.onExpression(restriction);
return this;
}
@Override
public CollectionAttributeJoin<O, E> on(Predicate... restrictions) {
super.onPredicates(restrictions);
return this;
}
@Override
@SuppressWarnings("unchecked")
public <T extends E> CollectionAttributeJoin<O, T> treatJoin(Class<T> treatType) {
setTreatType(treatType);
return (CollectionAttributeJoin<O, T>) this;
}
@Override
@SuppressWarnings("unchecked")
public <T extends E> CollectionAttributeJoin<O, T> treatAs(Class<T> treatAsType) {
// No need to treat if it is already of the proper subtype
if (treatAsType.isAssignableFrom(getJavaType())) {
return (CollectionAttributeJoin<O, T>) this;
}
return addTreatedPath(new TreatedCollectionAttributeJoin<>(criteriaBuilder, this, getTreatType(treatAsType)));
}
public static class TreatedCollectionAttributeJoin<O, E> extends CollectionAttributeJoin<O, E> implements TreatedPath<E> {
private static final long serialVersionUID = 1L;
private final CollectionAttributeJoin<?, ? super E> treatedJoin;
private final EntityType<E> treatType;
public TreatedCollectionAttributeJoin(BlazeCriteriaBuilderImpl criteriaBuilder, CollectionAttributeJoin<O, ? super E> treatedJoin, EntityType<E> treatType) {
super(criteriaBuilder, treatedJoin, treatType);
this.treatedJoin = treatedJoin;
this.treatType = treatType;
}
@Override
protected ManagedType<E> getManagedType() {
return treatType;
}
@Override
public EntityType<E> getTreatType() {
return treatType;
}
@Override
public AbstractPath<? super E> getTreatedPath() {
return treatedJoin;
}
@Override
public String getAlias() {
return treatedJoin.getAlias();
}
@Override
public String getPathExpression() {
return getAlias();
}
@Override
public void renderPathExpression(RenderContext context) {
render(context);
}
@Override
public void render(RenderContext context) {
prepareAlias(context);
final StringBuilder buffer = context.getBuffer();
buffer.append("TREAT(")
.append(getAlias())
.append(" AS ")
.append(getTreatType().getName())
.append(')');
}
}
}