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com.blazebit.persistence.impl.JpaUtils Maven / Gradle / Ivy
/*
* Copyright 2014 - 2019 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.parser.EntityMetamodel;
import com.blazebit.persistence.parser.PathTargetResolvingExpressionVisitor;
import com.blazebit.persistence.parser.expression.Expression;
import com.blazebit.persistence.parser.expression.NullExpression;
import com.blazebit.persistence.parser.expression.ParameterExpression;
import com.blazebit.persistence.parser.expression.PathExpression;
import com.blazebit.persistence.parser.expression.PropertyExpression;
import com.blazebit.persistence.spi.ExtendedAttribute;
import com.blazebit.persistence.spi.ExtendedManagedType;
import com.blazebit.persistence.spi.JoinTable;
import com.blazebit.persistence.spi.JpaMetamodelAccessor;
import com.blazebit.persistence.spi.JpaProvider;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.EntityType;
import javax.persistence.metamodel.ManagedType;
import javax.persistence.metamodel.PluralAttribute;
import javax.persistence.metamodel.Type;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NavigableSet;
import java.util.Queue;
import java.util.TreeSet;
/**
*
* @author Christian Beikov
* @since 1.0.0
*/
public final class JpaUtils {
private JpaUtils() {
}
private static boolean isBasicElementType(Attribute attribute) {
return attribute instanceof PluralAttribute && ((PluralAttribute) attribute).getElementType().getPersistenceType() == Type.PersistenceType.BASIC;
}
public static void expandBindings(EntityType bindType, Map bindingMap, Map columnBindingMap, Map> attributeEntries, ClauseType clause, AbstractCommonQueryBuilder queryBuilder) {
SelectManager selectManager = queryBuilder.selectManager;
JoinManager joinManager = queryBuilder.joinManager;
ParameterManager parameterManager = queryBuilder.parameterManager;
JpaProvider jpaProvider = queryBuilder.mainQuery.jpaProvider;
EntityMetamodel metamodel = queryBuilder.mainQuery.metamodel;
JpaMetamodelAccessor jpaMetamodelAccessor = jpaProvider.getJpaMetamodelAccessor();
boolean needsElementCollectionIdCutoff = jpaProvider.needsElementCollectionIdCutoff();
final Queue attributeQueue = new ArrayDeque<>(bindingMap.keySet());
while (!attributeQueue.isEmpty()) {
final String attributeName = attributeQueue.remove();
Integer tupleIndex = bindingMap.get(attributeName);
final ExtendedAttribute attributeEntry = attributeEntries.get(attributeName);
if (attributeEntry != null) {
final List> attributePath = attributeEntry.getAttributePath();
final Attribute lastAttribute = attributePath.get(attributePath.size() - 1);
boolean splitExpression = lastAttribute.getPersistentAttributeType() == Attribute.PersistentAttributeType.EMBEDDED;
if (!splitExpression && jpaMetamodelAccessor.isJoinable(lastAttribute) && !isBasicElementType(lastAttribute)) {
splitExpression = true;
if (needsElementCollectionIdCutoff) {
for (int i = 0; i < attributePath.size() - 1; i++) {
Attribute attribute = attributePath.get(i);
if (attribute.getPersistentAttributeType() == Attribute.PersistentAttributeType.ELEMENT_COLLECTION) {
splitExpression = false;
break;
}
}
}
}
if (splitExpression) {
// We have to map *-to-one relationships to their id or unique props
// NOTE: Since we are talking about *-to-ones, the expression can only be a path to an object
// so it is safe to just append the id to the path
Expression selectExpression = selectManager.getSelectInfos().get(tupleIndex).getExpression();
// TODO: Maybe also allow Treat, Case-When, Array?
if (selectExpression instanceof NullExpression) {
// When binding null, we don't have to adapt anything
} else if (selectExpression instanceof PathExpression) {
boolean firstBinding = true;
final Collection embeddedPropertyNames = getEmbeddedPropertyPaths(attributeEntries, attributeName, needsElementCollectionIdCutoff, false);
PathExpression baseExpression = embeddedPropertyNames.size() > 1 ?
((PathExpression) selectExpression).clone(false) : ((PathExpression) selectExpression);
joinManager.implicitJoin(baseExpression, true, true, null, ClauseType.SELECT, new HashSet(), false, false, false, false);
if (attributeEntry.getElementClass() != baseExpression.getPathReference().getType().getJavaType()) {
throw new IllegalStateException("An association should be bound to its association type and not its identifier type");
}
if (embeddedPropertyNames.size() > 0) {
bindingMap.remove(attributeName);
// We are going to insert the expanded attributes as new select items and shift existing ones
int delta = embeddedPropertyNames.size() - 1;
if (delta > 0) {
for (Map.Entry entry : bindingMap.entrySet()) {
if (entry.getValue() > tupleIndex) {
entry.setValue(entry.getValue() + delta);
}
}
}
int offset = 0;
for (String embeddedPropertyName : embeddedPropertyNames) {
PathExpression pathExpression = firstBinding ?
((PathExpression) selectExpression) : baseExpression.clone(false);
for (String propertyNamePart : embeddedPropertyName.split("\\.")) {
pathExpression.getExpressions().add(new PropertyExpression(propertyNamePart));
}
String nestedAttributePath = attributeName + "." + embeddedPropertyName;
ExtendedAttribute nestedAttributeEntry = attributeEntries.get(nestedAttributePath);
// Process the nested attribute path recursively
attributeQueue.add(nestedAttributePath);
// Replace this binding in the binding map, additional selects need an updated index
bindingMap.put(nestedAttributePath, firstBinding ? tupleIndex : tupleIndex + offset);
if (!firstBinding) {
selectManager.select(pathExpression, null, tupleIndex + offset);
} else {
firstBinding = false;
}
for (String column : nestedAttributeEntry.getColumnNames()) {
columnBindingMap.put(column, nestedAttributePath);
}
offset++;
}
}
} else if (selectExpression instanceof ParameterExpression) {
final Collection embeddedPropertyNames = getEmbeddedPropertyPaths(attributeEntries, attributeName, jpaProvider.needsElementCollectionIdCutoff(), false);
if (embeddedPropertyNames.size() > 0) {
ParameterExpression parameterExpression = (ParameterExpression) selectExpression;
String parameterName = parameterExpression.getName();
Map> parameterAccessPaths = new HashMap<>(embeddedPropertyNames.size());
ParameterValueTransformer tranformer = parameterManager.getParameter(parameterName).getTranformer();
if (tranformer instanceof SplittingParameterTransformer) {
for (String name : ((SplittingParameterTransformer) tranformer).getParameterNames()) {
parameterManager.unregisterParameterName(name, clause, queryBuilder);
}
}
selectManager.getSelectInfos().remove(tupleIndex.intValue());
bindingMap.remove(attributeName);
// We are going to insert the expanded attributes as new select items and shift existing ones
int delta = embeddedPropertyNames.size() - 1;
if (delta > 0) {
for (Map.Entry entry : bindingMap.entrySet()) {
if (entry.getValue() > tupleIndex) {
entry.setValue(entry.getValue() + delta);
}
}
}
int offset = 0;
for (String embeddedPropertyName : embeddedPropertyNames) {
String subParamName = "_" + parameterName + "_" + embeddedPropertyName.replace('.', '_');
parameterManager.registerParameterName(subParamName, false, clause, queryBuilder);
parameterAccessPaths.put(subParamName, Arrays.asList(embeddedPropertyName.split("\\.")));
String nestedAttributePath = attributeName + "." + embeddedPropertyName;
ExtendedAttribute nestedAttributeEntry = attributeEntries.get(nestedAttributePath);
// Process the nested attribute path recursively
attributeQueue.add(nestedAttributePath);
// Replace this binding in the binding map, additional selects need an updated index
bindingMap.put(nestedAttributePath, tupleIndex + offset);
selectManager.select(new ParameterExpression(subParamName), null, tupleIndex + offset);
for (String column : nestedAttributeEntry.getColumnNames()) {
columnBindingMap.put(column, nestedAttributePath);
}
offset++;
}
parameterManager.getParameter(parameterName).setTranformer(new SplittingParameterTransformer(parameterManager, metamodel, attributeEntry.getElementClass(), parameterAccessPaths));
}
} else {
throw new IllegalArgumentException("Illegal expression '" + selectExpression.toString() + "' for binding relation '" + attributeName + "'!");
}
}
}
}
}
public static Collection getEmbeddedPropertyPaths(Map> attributeEntries, String attributeName, boolean needsElementCollectionIdCutoff, boolean filterCollections) {
final NavigableSet embeddedPropertyNames = new TreeSet<>();
String prefix = attributeName == null ? "" : attributeName + ".";
int dotCount = -1;
int dotIndex = -1;
do {
dotCount++;
dotIndex = prefix.indexOf('.', dotIndex + 1);
} while (dotIndex != -1);
OUTER: for (Map.Entry> entry : attributeEntries.entrySet()) {
if (entry.getKey().startsWith(prefix)) {
if (filterCollections) {
List> attributePath = entry.getValue().getAttributePath();
for (int i = dotCount; i < attributePath.size(); i++) {
if (attributePath.get(i).isCollection()) {
continue OUTER;
}
}
}
String subAttribute = entry.getKey().substring(prefix.length());
String lower = embeddedPropertyNames.lower(subAttribute);
if (lower == null) {
String higher = embeddedPropertyNames.higher(subAttribute);
if (higher == null || !higher.startsWith(subAttribute + ".")) {
embeddedPropertyNames.add(subAttribute);
}
} else {
if (subAttribute.startsWith(lower + ".")) {
embeddedPropertyNames.remove(lower);
}
if (!lower.startsWith(subAttribute + ".")) {
String higher = embeddedPropertyNames.higher(subAttribute);
if (higher == null || !higher.startsWith(subAttribute + ".")) {
embeddedPropertyNames.add(subAttribute);
}
}
}
}
}
// Remove the embeddable itself since it was split up
if (attributeName != null) {
embeddedPropertyNames.remove(attributeName);
// Hibernate has a bug in the handling of the deep property named "id" when being part of an element collection alias, so we cut it off
if (needsElementCollectionIdCutoff && attributeEntries.get(attributeName).getAttribute().getPersistentAttributeType() == Attribute.PersistentAttributeType.ELEMENT_COLLECTION) {
Iterator iterator = embeddedPropertyNames.iterator();
List addProperties = new ArrayList<>();
while (iterator.hasNext()) {
String property = iterator.next();
if (property.endsWith(".id")) {
iterator.remove();
addProperties.add(property.substring(0, property.length() - ".id".length()));
}
}
embeddedPropertyNames.addAll(addProperties);
}
}
return embeddedPropertyNames;
}
public static Map> getCollectionAttributeEntries(EntityMetamodel metamodel, EntityType entityType, ExtendedAttribute attribute) {
Map> collectionAttributeEntries = new HashMap<>();
JoinTable joinTable = attribute.getJoinTable();
if (joinTable == null) {
throw new IllegalArgumentException("Inserting into or updating an inverse collection via DML API is not supported!");
}
ExtendedManagedType extendedManagedType = metamodel.getManagedType(ExtendedManagedType.class, entityType);
for (String idAttributeName : joinTable.getIdAttributeNames()) {
collectionAttributeEntries.put(idAttributeName, extendedManagedType.getAttribute(idAttributeName));
}
if (((PluralAttribute) attribute.getAttribute()).getElementType() instanceof ManagedType) {
String prefix = attribute.getAttributePathString() + ".";
for (Map.Entry> entry : extendedManagedType.getAttributes().entrySet()) {
if (entry.getKey().startsWith(prefix)) {
collectionAttributeEntries.put(entry.getKey(), entry.getValue());
}
}
}
collectionAttributeEntries.put(attribute.getAttributePathString(), attribute);
return collectionAttributeEntries;
}
public static AttributeHolder getAttributeForJoining(EntityMetamodel metamodel, PathExpression expression) {
JoinNode expressionBaseNode = ((JoinNode) expression.getPathReference().getBaseNode());
String firstElementString = expression.getExpressions().get(0).toString();
String baseNodeAlias;
JoinNode baseNode = expressionBaseNode;
do {
baseNodeAlias = baseNode.getAlias();
} while (!firstElementString.equals(baseNodeAlias) && (baseNode = baseNode.getParent()) != null);
if (baseNode == null) {
baseNodeAlias = null;
if (expressionBaseNode.getParent() == null) {
baseNode = expressionBaseNode;
} else {
baseNode = expressionBaseNode.getParent();
}
}
return getAttributeForJoining(metamodel, baseNode.getNodeType(), expression, baseNodeAlias);
}
public static AttributeHolder getAttributeForJoining(EntityMetamodel metamodel, Expression resolvedExpression) {
return getAttributeForJoining(metamodel, null, resolvedExpression, null);
}
public static AttributeHolder getAttributeForJoining(EntityMetamodel metamodel, Type baseNodeType, Expression joinExpression, String baseNodeAlias) {
PathTargetResolvingExpressionVisitor visitor = new PathTargetResolvingExpressionVisitor(metamodel, baseNodeType, baseNodeAlias);
joinExpression.accept(visitor);
Map, Type> possibleTargets = visitor.getPossibleTargets();
if (possibleTargets.size() > 1) {
throw new IllegalArgumentException("Multiple possible target types for expression: " + joinExpression);
}
Map.Entry, Type> entry = possibleTargets.entrySet().iterator().next();
return new AttributeHolder(entry.getKey(), entry.getValue());
}
}
