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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.impl;
import com.blazebit.persistence.BaseDeleteCriteriaBuilder;
import com.blazebit.persistence.JoinType;
import com.blazebit.persistence.ReturningBuilder;
import com.blazebit.persistence.ReturningObjectBuilder;
import com.blazebit.persistence.ReturningResult;
import com.blazebit.persistence.impl.function.entity.ValuesEntity;
import com.blazebit.persistence.impl.query.CTENode;
import com.blazebit.persistence.impl.query.CollectionDeleteModificationQuerySpecification;
import com.blazebit.persistence.impl.query.CustomReturningSQLTypedQuery;
import com.blazebit.persistence.impl.query.CustomSQLQuery;
import com.blazebit.persistence.impl.query.QuerySpecification;
import com.blazebit.persistence.impl.query.ReturningCollectionDeleteModificationQuerySpecification;
import com.blazebit.persistence.impl.util.SqlUtils;
import com.blazebit.persistence.parser.expression.ExpressionCopyContext;
import com.blazebit.persistence.spi.DbmsModificationState;
import com.blazebit.persistence.spi.ExtendedAttribute;
import com.blazebit.persistence.spi.ExtendedManagedType;
import com.blazebit.persistence.spi.ExtendedQuerySupport;
import com.blazebit.persistence.spi.JoinTable;
import javax.persistence.Query;
import javax.persistence.TypedQuery;
import javax.persistence.metamodel.EntityType;
import javax.persistence.metamodel.Type;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
*
* @param The query result type
* @author Christian Beikov
* @since 1.2.0
*/
public abstract class AbstractDeleteCollectionCriteriaBuilder, Y> extends BaseDeleteCriteriaBuilderImpl {
protected final String collectionName;
protected final Type elementType;
protected final ExtendedAttribute collectionAttribute;
public AbstractDeleteCollectionCriteriaBuilder(MainQuery mainQuery, QueryContext queryContext, boolean isMainQuery, Class clazz, String alias, CTEManager.CTEKey cteKey, Class cteClass, Y result, CTEBuilderListener listener, String collectionName) {
super(mainQuery, queryContext, isMainQuery, clazz, alias, cteKey, cteClass, result, listener);
this.collectionName = collectionName;
ExtendedManagedType extendedManagedType = mainQuery.metamodel.getManagedType(ExtendedManagedType.class, entityType);
this.collectionAttribute = extendedManagedType.getAttribute(collectionName);
// Add the join here so that references in the where clause goes the the expected join node
// Also, this validates the collection actually exists
JoinNode join = joinManager.join(entityAlias + "." + collectionName, CollectionDeleteModificationQuerySpecification.COLLECTION_BASE_QUERY_ALIAS, JoinType.LEFT, false, true);
this.elementType = join.getType();
if (collectionAttribute.getJoinTable() == null && "".equals(collectionAttribute.getMappedBy())) {
throw new IllegalArgumentException("Unsupported collection attribute that doesn't have a join table or a mapped by attribute!");
}
if (collectionAttribute.getMappedBy() != null) {
// Use a different alias to properly prefix paths with the collection role alias
JoinNode rootNode = joinManager.getRootNodeOrFail(null);
rootNode.getAliasInfo().setAlias(CollectionDeleteModificationQuerySpecification.COLLECTION_BASE_QUERY_ALIAS + "." + collectionAttribute.getMappedBy());
}
}
public AbstractDeleteCollectionCriteriaBuilder(AbstractDeleteCollectionCriteriaBuilder builder, MainQuery mainQuery, QueryContext queryContext, Map joinManagerMapping, ExpressionCopyContext copyContext) {
super(builder, mainQuery, queryContext, joinManagerMapping, copyContext);
this.collectionName = builder.collectionName;
this.collectionAttribute = builder.collectionAttribute;
this.elementType = builder.elementType;
}
@Override
protected void buildBaseQueryString(StringBuilder sbSelectFrom, boolean externalRepresentation, JoinNode lateralJoinNode) {
if (externalRepresentation) {
sbSelectFrom.append("DELETE FROM ");
sbSelectFrom.append(entityType.getName());
sbSelectFrom.append('(').append(collectionName).append(") ");
sbSelectFrom.append(entityAlias);
appendWhereClause(sbSelectFrom, externalRepresentation);
} else if (collectionAttribute.getJoinTable() == null) {
sbSelectFrom.append("DELETE FROM ");
sbSelectFrom.append(((EntityType) elementType).getName());
sbSelectFrom.append(' ');
sbSelectFrom.append(CollectionDeleteModificationQuerySpecification.COLLECTION_BASE_QUERY_ALIAS);
appendWhereClause(sbSelectFrom, externalRepresentation);
} else {
// The internal representation is just a "hull" to hold the parameters at the appropriate positions
sbSelectFrom.append("SELECT 1 FROM ");
sbSelectFrom.append(entityType.getName());
sbSelectFrom.append(' ');
sbSelectFrom.append(entityAlias);
sbSelectFrom.append(" LEFT JOIN ");
sbSelectFrom.append(entityAlias).append('.').append(collectionName)
.append(' ').append(CollectionDeleteModificationQuerySpecification.COLLECTION_BASE_QUERY_ALIAS);
appendWhereClause(sbSelectFrom, externalRepresentation);
}
}
@Override
protected Query getQuery(Map includedModificationStates) {
if (collectionAttribute.getJoinTable() == null) {
return super.getQuery(includedModificationStates);
} else {
Query baseQuery = em.createQuery(getBaseQueryStringWithCheck(null, null));
QuerySpecification querySpecification = getQuerySpecification(baseQuery, getCountExampleQuery(), getReturningColumns(), null, includedModificationStates);
Query query = new CustomSQLQuery(
querySpecification,
baseQuery,
parameterManager.getTransformers(),
parameterManager.getValuesParameters(),
parameterManager.getValuesBinders()
);
parameterManager.parameterizeQuery(query);
return query;
}
}
@Override
protected TypedQuery> getExecuteWithReturningQuery(TypedQuery exampleQuery, Query baseQuery, String[] returningColumns, ReturningObjectBuilder objectBuilder) {
if (collectionAttribute.getJoinTable() == null) {
return super.getExecuteWithReturningQuery(exampleQuery, baseQuery, returningColumns, objectBuilder);
} else {
QuerySpecification querySpecification = getQuerySpecification(baseQuery, exampleQuery, returningColumns, objectBuilder, null);
CustomReturningSQLTypedQuery query = new CustomReturningSQLTypedQuery(
querySpecification,
exampleQuery,
parameterManager.getTransformers(),
parameterManager.getValuesParameters(),
parameterManager.getValuesBinders()
);
parameterManager.parameterizeQuery(query);
return query;
}
}
private QuerySpecification getQuerySpecification(Query baseQuery, Query exampleQuery, String[] returningColumns, ReturningObjectBuilder objectBuilder, Map includedModificationStates) {
Set parameterListNames = parameterManager.getParameterListNames(baseQuery);
boolean isEmbedded = this instanceof ReturningBuilder;
boolean shouldRenderCteNodes = renderCteNodes(isEmbedded);
List ctes = shouldRenderCteNodes ? getCteNodes(isEmbedded) : Collections.EMPTY_LIST;
// Prepare a Map
// This is used to replace references to id columns properly in the final sql query
ExtendedQuerySupport extendedQuerySupport = getService(ExtendedQuerySupport.class);
String sql = extendedQuerySupport.getSql(em, baseQuery);
String ownerAlias = extendedQuerySupport.getSqlAlias(em, baseQuery, entityAlias);
String targetAlias = extendedQuerySupport.getSqlAlias(em, baseQuery, CollectionDeleteModificationQuerySpecification.COLLECTION_BASE_QUERY_ALIAS);
JoinTable joinTable = collectionAttribute.getJoinTable();
if (joinTable == null) {
throw new IllegalStateException("Deleting inverse collections is not supported!");
}
int joinTableIndex = SqlUtils.indexOfTableName(sql, joinTable.getTableName());
String collectionAlias = SqlUtils.extractAlias(sql, joinTableIndex + joinTable.getTableName().length());
String deleteSql = "delete from " + joinTable.getTableName();
Map columnExpressionRemappings = new HashMap<>(joinTable.getIdColumnMappings().size());
columnExpressionRemappings.put(collectionAlias + ".", joinTable.getTableName() + ".");
String[] discriminatorColumnCheck = mainQuery.jpaProvider.getDiscriminatorColumnCheck(entityType);
if (discriminatorColumnCheck != null) {
columnExpressionRemappings.put(ownerAlias + "." + discriminatorColumnCheck[0] + "=" + discriminatorColumnCheck[1], "1=1");
}
for (Map.Entry entry : joinTable.getIdColumnMappings().entrySet()) {
columnExpressionRemappings.put(ownerAlias + "." + entry.getValue(), joinTable.getTableName() + "." + entry.getKey());
}
for (Map.Entry entry : joinTable.getTargetColumnMappings().entrySet()) {
columnExpressionRemappings.put(targetAlias + "." + entry.getValue(), joinTable.getTableName() + "." + entry.getKey());
}
if (returningColumns == null) {
return new CollectionDeleteModificationQuerySpecification(
this,
baseQuery,
exampleQuery,
parameterManager.getParameters(),
parameterListNames,
mainQuery.cteManager.isRecursive(),
ctes,
shouldRenderCteNodes,
isEmbedded,
returningColumns,
includedModificationStates,
returningAttributeBindingMap,
getDeleteExampleQuery(),
deleteSql,
columnExpressionRemappings
);
} else {
return new ReturningCollectionDeleteModificationQuerySpecification<>(
this,
baseQuery,
exampleQuery,
parameterManager.getParameters(),
parameterListNames,
mainQuery.cteManager.isRecursive(),
ctes,
shouldRenderCteNodes,
isEmbedded,
returningColumns,
includedModificationStates,
returningAttributeBindingMap,
getDeleteExampleQuery(),
deleteSql,
columnExpressionRemappings,
objectBuilder
);
}
}
protected Query getDeleteExampleQuery() {
// This is the query we use as "hull" to put other sqls into
// We chose ValuesEntity as deletion base because it is known to be non-polymorphic
// We could have used the owner entity type as well, but at the time of writing,
// it wasn't clear if problems might arise when the entity type were polymorphic
String exampleQueryString = "DELETE FROM " + ValuesEntity.class.getSimpleName();
return em.createQuery(exampleQueryString);
}
}
