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/*
* Copyright 2014 - 2020 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.BlazeMapJoin;
import com.blazebit.persistence.criteria.impl.BlazeCriteriaBuilderImpl;
import com.blazebit.persistence.criteria.impl.RenderContext;
import com.blazebit.persistence.criteria.impl.expression.SubqueryExpression;
import com.blazebit.persistence.criteria.impl.expression.function.EntryFunction;
import com.blazebit.persistence.criteria.impl.support.MapJoinSupport;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.JoinType;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import javax.persistence.metamodel.EntityType;
import javax.persistence.metamodel.ManagedType;
import javax.persistence.metamodel.MapAttribute;
import java.util.Map;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class MapAttributeJoin extends AbstractPluralAttributeJoin, V> implements BlazeMapJoin, MapJoinSupport {
private static final long serialVersionUID = 1L;
private MapAttributeJoin(BlazeCriteriaBuilderImpl criteriaBuilder, MapAttributeJoin original, EntityType treatType) {
super(criteriaBuilder, original, treatType);
}
public MapAttributeJoin(BlazeCriteriaBuilderImpl criteriaBuilder, Class javaType, AbstractPath pathSource, MapAttribute joinAttribute, JoinType joinType) {
super(criteriaBuilder, javaType, pathSource, joinAttribute, joinType);
}
@Override
@SuppressWarnings({"unchecked"})
public MapAttribute getAttribute() {
return (MapAttribute) super.getAttribute();
}
@Override
public MapAttribute getModel() {
return getAttribute();
}
@Override
public final MapAttributeJoin correlateTo(SubqueryExpression subquery) {
return (MapAttributeJoin) super.correlateTo(subquery);
}
@Override
@SuppressWarnings({"unchecked"})
protected AbstractFrom createCorrelationDelegate() {
return new MapAttributeJoin(criteriaBuilder, getJavaType(), (AbstractPath) getParentPath(), getAttribute(), getJoinType());
}
@Override
public Path value() {
return this;
}
@Override
@SuppressWarnings({"unchecked"})
public Expression> entry() {
return new EntryFunction(criteriaBuilder, Map.Entry.class, this);
}
@Override
@SuppressWarnings({"unchecked"})
public Path key() {
final MapKeyBasePath mapKeyBasePath = new MapKeyBasePath(criteriaBuilder, getAttribute().getJavaType(), this, getAttribute());
final MapKeyAttribute mapKeyAttribute = new MapKeyAttribute(criteriaBuilder, getAttribute());
return new MapKeyPath(criteriaBuilder, mapKeyBasePath, mapKeyAttribute);
}
/* JPA 2.1 support */
@Override
public MapAttributeJoin on(Expression restriction) {
super.onExpression(restriction);
return this;
}
@Override
public MapAttributeJoin on(Predicate... restrictions) {
super.onPredicates(restrictions);
return this;
}
@Override
@SuppressWarnings("unchecked")
public MapAttributeJoin treatJoin(Class treatType) {
setTreatType(treatType);
return (MapAttributeJoin) this;
}
@Override
@SuppressWarnings("unchecked")
public MapAttributeJoin treatAs(Class treatAsType) {
// No need to treat if it is already of the proper subtype
if (treatAsType.isAssignableFrom(getJavaType())) {
return (MapAttributeJoin) this;
}
return addTreatedPath(new TreatedMapAttributeJoin(criteriaBuilder, this, getTreatType(treatAsType)));
}
/**
* @author Christian Beikov
* @since 1.2.0
*/
public static class TreatedMapAttributeJoin extends MapAttributeJoin implements TreatedPath {
private static final long serialVersionUID = 1L;
private final MapAttributeJoin treatedJoin;
private final EntityType treatType;
public TreatedMapAttributeJoin(BlazeCriteriaBuilderImpl criteriaBuilder, MapAttributeJoin treatedJoin, EntityType treatType) {
super(criteriaBuilder, treatedJoin, treatType);
this.treatedJoin = treatedJoin;
this.treatType = treatType;
}
@Override
protected ManagedType getManagedType() {
return treatType;
}
@Override
public EntityType getTreatType() {
return treatType;
}
@Override
public AbstractPath 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(')');
}
}
}