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org.hibernate.loader.custom.CustomLoader Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.loader.custom;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.QueryException;
import org.hibernate.ScrollableResults;
import org.hibernate.Session;
import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.LimitHelper;
import org.hibernate.engine.spi.QueryParameters;
import org.hibernate.engine.spi.RowSelection;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.hql.internal.HolderInstantiator;
import org.hibernate.internal.util.StringHelper;
import org.hibernate.internal.util.collections.ArrayHelper;
import org.hibernate.loader.CollectionAliases;
import org.hibernate.loader.EntityAliases;
import org.hibernate.loader.Loader;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.persister.collection.QueryableCollection;
import org.hibernate.persister.entity.Loadable;
import org.hibernate.persister.entity.Lockable;
import org.hibernate.persister.entity.Queryable;
import org.hibernate.transform.ResultTransformer;
import org.hibernate.type.CollectionType;
import org.hibernate.type.EntityType;
import org.hibernate.type.Type;
/**
* Extension point for loaders which use a SQL result set with "unexpected" column aliases.
*
* @author Gavin King
* @author Steve Ebersole
*/
public class CustomLoader extends Loader {
// Currently *not* cachable if autodiscover types is in effect (e.g. "select * ...")
private final String sql;
private final Set querySpaces = new HashSet();
private final Map namedParameterBindPoints;
private final Queryable[] entityPersisters;
private final int[] entiytOwners;
private final EntityAliases[] entityAliases;
private final QueryableCollection[] collectionPersisters;
private final int[] collectionOwners;
private final CollectionAliases[] collectionAliases;
private final LockMode[] lockModes;
private boolean[] includeInResultRow;
// private final String[] sqlAliases;
// private final String[] sqlAliasSuffixes;
private final ResultRowProcessor rowProcessor;
// this is only needed (afaict) for processing results from the query cache;
// however, this cannot possibly work in the case of discovered types...
private Type[] resultTypes;
// this is only needed (afaict) for ResultTransformer processing...
private String[] transformerAliases;
public CustomLoader(CustomQuery customQuery, SessionFactoryImplementor factory) {
super( factory );
this.sql = customQuery.getSQL();
this.querySpaces.addAll( customQuery.getQuerySpaces() );
this.namedParameterBindPoints = customQuery.getNamedParameterBindPoints();
List entityPersisters = new ArrayList();
List entityOwners = new ArrayList();
List entityAliases = new ArrayList();
List collectionPersisters = new ArrayList();
List collectionOwners = new ArrayList();
List collectionAliases = new ArrayList();
List lockModes = new ArrayList();
List resultColumnProcessors = new ArrayList();
List nonScalarReturnList = new ArrayList();
List resultTypes = new ArrayList();
List specifiedAliases = new ArrayList();
int returnableCounter = 0;
boolean hasScalars = false;
List includeInResultRowList = new ArrayList();
Iterator itr = customQuery.getCustomQueryReturns().iterator();
while ( itr.hasNext() ) {
final Return rtn = ( Return ) itr.next();
if ( rtn instanceof ScalarReturn ) {
ScalarReturn scalarRtn = ( ScalarReturn ) rtn;
resultTypes.add( scalarRtn.getType() );
specifiedAliases.add( scalarRtn.getColumnAlias() );
resultColumnProcessors.add(
new ScalarResultColumnProcessor(
StringHelper.unquote( scalarRtn.getColumnAlias(), factory.getDialect() ),
scalarRtn.getType()
)
);
includeInResultRowList.add( true );
hasScalars = true;
}
else if ( rtn instanceof RootReturn ) {
RootReturn rootRtn = ( RootReturn ) rtn;
Queryable persister = ( Queryable ) factory.getEntityPersister( rootRtn.getEntityName() );
entityPersisters.add( persister );
lockModes.add( (rootRtn.getLockMode()) );
resultColumnProcessors.add( new NonScalarResultColumnProcessor( returnableCounter++ ) );
nonScalarReturnList.add( rtn );
entityOwners.add( -1 );
resultTypes.add( persister.getType() );
specifiedAliases.add( rootRtn.getAlias() );
entityAliases.add( rootRtn.getEntityAliases() );
ArrayHelper.addAll( querySpaces, persister.getQuerySpaces() );
includeInResultRowList.add( true );
}
else if ( rtn instanceof CollectionReturn ) {
CollectionReturn collRtn = ( CollectionReturn ) rtn;
String role = collRtn.getOwnerEntityName() + "." + collRtn.getOwnerProperty();
QueryableCollection persister = ( QueryableCollection ) factory.getCollectionPersister( role );
collectionPersisters.add( persister );
lockModes.add( collRtn.getLockMode() );
resultColumnProcessors.add( new NonScalarResultColumnProcessor( returnableCounter++ ) );
nonScalarReturnList.add( rtn );
collectionOwners.add( -1 );
resultTypes.add( persister.getType() );
specifiedAliases.add( collRtn.getAlias() );
collectionAliases.add( collRtn.getCollectionAliases() );
// determine if the collection elements are entities...
Type elementType = persister.getElementType();
if ( elementType.isEntityType() ) {
Queryable elementPersister = ( Queryable ) ( ( EntityType ) elementType ).getAssociatedJoinable( factory );
entityPersisters.add( elementPersister );
entityOwners.add( -1 );
entityAliases.add( collRtn.getElementEntityAliases() );
ArrayHelper.addAll( querySpaces, elementPersister.getQuerySpaces() );
}
includeInResultRowList.add( true );
}
else if ( rtn instanceof EntityFetchReturn ) {
EntityFetchReturn fetchRtn = ( EntityFetchReturn ) rtn;
NonScalarReturn ownerDescriptor = fetchRtn.getOwner();
int ownerIndex = nonScalarReturnList.indexOf( ownerDescriptor );
entityOwners.add( ownerIndex );
lockModes.add( fetchRtn.getLockMode() );
Queryable ownerPersister = determineAppropriateOwnerPersister( ownerDescriptor );
EntityType fetchedType = ( EntityType ) ownerPersister.getPropertyType( fetchRtn.getOwnerProperty() );
String entityName = fetchedType.getAssociatedEntityName( getFactory() );
Queryable persister = ( Queryable ) factory.getEntityPersister( entityName );
entityPersisters.add( persister );
nonScalarReturnList.add( rtn );
specifiedAliases.add( fetchRtn.getAlias() );
entityAliases.add( fetchRtn.getEntityAliases() );
ArrayHelper.addAll( querySpaces, persister.getQuerySpaces() );
includeInResultRowList.add( false );
}
else if ( rtn instanceof CollectionFetchReturn ) {
CollectionFetchReturn fetchRtn = ( CollectionFetchReturn ) rtn;
NonScalarReturn ownerDescriptor = fetchRtn.getOwner();
int ownerIndex = nonScalarReturnList.indexOf( ownerDescriptor );
collectionOwners.add( ownerIndex );
lockModes.add( fetchRtn.getLockMode() );
Queryable ownerPersister = determineAppropriateOwnerPersister( ownerDescriptor );
String role = ownerPersister.getEntityName() + '.' + fetchRtn.getOwnerProperty();
QueryableCollection persister = ( QueryableCollection ) factory.getCollectionPersister( role );
collectionPersisters.add( persister );
nonScalarReturnList.add( rtn );
specifiedAliases.add( fetchRtn.getAlias() );
collectionAliases.add( fetchRtn.getCollectionAliases() );
// determine if the collection elements are entities...
Type elementType = persister.getElementType();
if ( elementType.isEntityType() ) {
Queryable elementPersister = ( Queryable ) ( ( EntityType ) elementType ).getAssociatedJoinable( factory );
entityPersisters.add( elementPersister );
entityOwners.add( ownerIndex );
entityAliases.add( fetchRtn.getElementEntityAliases() );
ArrayHelper.addAll( querySpaces, elementPersister.getQuerySpaces() );
}
includeInResultRowList.add( false );
}
else {
throw new HibernateException( "unexpected custom query return type : " + rtn.getClass().getName() );
}
}
this.entityPersisters = new Queryable[ entityPersisters.size() ];
for ( int i = 0; i < entityPersisters.size(); i++ ) {
this.entityPersisters[i] = ( Queryable ) entityPersisters.get( i );
}
this.entiytOwners = ArrayHelper.toIntArray( entityOwners );
this.entityAliases = new EntityAliases[ entityAliases.size() ];
for ( int i = 0; i < entityAliases.size(); i++ ) {
this.entityAliases[i] = ( EntityAliases ) entityAliases.get( i );
}
this.collectionPersisters = new QueryableCollection[ collectionPersisters.size() ];
for ( int i = 0; i < collectionPersisters.size(); i++ ) {
this.collectionPersisters[i] = ( QueryableCollection ) collectionPersisters.get( i );
}
this.collectionOwners = ArrayHelper.toIntArray( collectionOwners );
this.collectionAliases = new CollectionAliases[ collectionAliases.size() ];
for ( int i = 0; i < collectionAliases.size(); i++ ) {
this.collectionAliases[i] = ( CollectionAliases ) collectionAliases.get( i );
}
this.lockModes = new LockMode[ lockModes.size() ];
for ( int i = 0; i < lockModes.size(); i++ ) {
this.lockModes[i] = ( LockMode ) lockModes.get( i );
}
this.resultTypes = ArrayHelper.toTypeArray( resultTypes );
this.transformerAliases = ArrayHelper.toStringArray( specifiedAliases );
this.rowProcessor = new ResultRowProcessor(
hasScalars,
( ResultColumnProcessor[] ) resultColumnProcessors.toArray( new ResultColumnProcessor[ resultColumnProcessors.size() ] )
);
this.includeInResultRow = ArrayHelper.toBooleanArray( includeInResultRowList );
}
private Queryable determineAppropriateOwnerPersister(NonScalarReturn ownerDescriptor) {
String entityName = null;
if ( ownerDescriptor instanceof RootReturn ) {
entityName = ( ( RootReturn ) ownerDescriptor ).getEntityName();
}
else if ( ownerDescriptor instanceof CollectionReturn ) {
CollectionReturn collRtn = ( CollectionReturn ) ownerDescriptor;
String role = collRtn.getOwnerEntityName() + "." + collRtn.getOwnerProperty();
CollectionPersister persister = getFactory().getCollectionPersister( role );
EntityType ownerType = ( EntityType ) persister.getElementType();
entityName = ownerType.getAssociatedEntityName( getFactory() );
}
else if ( ownerDescriptor instanceof FetchReturn ) {
FetchReturn fetchRtn = ( FetchReturn ) ownerDescriptor;
Queryable persister = determineAppropriateOwnerPersister( fetchRtn.getOwner() );
Type ownerType = persister.getPropertyType( fetchRtn.getOwnerProperty() );
if ( ownerType.isEntityType() ) {
entityName = ( ( EntityType ) ownerType ).getAssociatedEntityName( getFactory() );
}
else if ( ownerType.isCollectionType() ) {
Type ownerCollectionElementType = ( ( CollectionType ) ownerType ).getElementType( getFactory() );
if ( ownerCollectionElementType.isEntityType() ) {
entityName = ( ( EntityType ) ownerCollectionElementType ).getAssociatedEntityName( getFactory() );
}
}
}
if ( entityName == null ) {
throw new HibernateException( "Could not determine fetch owner : " + ownerDescriptor );
}
return ( Queryable ) getFactory().getEntityPersister( entityName );
}
@Override
protected String getQueryIdentifier() {
return sql;
}
@Override
public String getSQLString() {
return sql;
}
public Set getQuerySpaces() {
return querySpaces;
}
@Override
protected LockMode[] getLockModes(LockOptions lockOptions) {
return lockModes;
}
@Override
protected Loadable[] getEntityPersisters() {
return entityPersisters;
}
@Override
protected CollectionPersister[] getCollectionPersisters() {
return collectionPersisters;
}
@Override
protected int[] getCollectionOwners() {
return collectionOwners;
}
@Override
protected int[] getOwners() {
return entiytOwners;
}
public List list(SessionImplementor session, QueryParameters queryParameters) throws HibernateException {
return list( session, queryParameters, querySpaces, resultTypes );
}
@Override
protected String applyLocks(
String sql,
QueryParameters parameters,
Dialect dialect,
List afterLoadActions) throws QueryException {
final LockOptions lockOptions = parameters.getLockOptions();
if ( lockOptions == null ||
( lockOptions.getLockMode() == LockMode.NONE && lockOptions.getAliasLockCount() == 0 ) ) {
return sql;
}
// user is request locking, lets see if we can apply locking directly to the SQL...
// some dialects wont allow locking with paging...
afterLoadActions.add(
new AfterLoadAction() {
private final LockOptions originalLockOptions = lockOptions.makeCopy();
@Override
public void afterLoad(SessionImplementor session, Object entity, Loadable persister) {
( (Session) session ).buildLockRequest( originalLockOptions ).lock( persister.getEntityName(), entity );
}
}
);
parameters.getLockOptions().setLockMode( LockMode.READ );
return sql;
}
public ScrollableResults scroll(
final QueryParameters queryParameters,
final SessionImplementor session) throws HibernateException {
return scroll(
queryParameters,
resultTypes,
getHolderInstantiator( queryParameters.getResultTransformer(), getReturnAliasesForTransformer() ),
session
);
}
static private HolderInstantiator getHolderInstantiator(ResultTransformer resultTransformer, String[] queryReturnAliases) {
if ( resultTransformer == null ) {
return HolderInstantiator.NOOP_INSTANTIATOR;
}
else {
return new HolderInstantiator(resultTransformer, queryReturnAliases);
}
}
@Override
protected String[] getResultRowAliases() {
return transformerAliases;
}
@Override
protected ResultTransformer resolveResultTransformer(ResultTransformer resultTransformer) {
return HolderInstantiator.resolveResultTransformer( null, resultTransformer );
}
@Override
protected boolean[] includeInResultRow() {
return includeInResultRow;
}
@Override
protected Object getResultColumnOrRow(
Object[] row,
ResultTransformer transformer,
ResultSet rs,
SessionImplementor session) throws SQLException, HibernateException {
return rowProcessor.buildResultRow( row, rs, transformer != null, session );
}
@Override
protected Object[] getResultRow(Object[] row, ResultSet rs, SessionImplementor session)
throws SQLException, HibernateException {
return rowProcessor.buildResultRow( row, rs, session );
}
@Override
protected List getResultList(List results, ResultTransformer resultTransformer) throws QueryException {
// meant to handle dynamic instantiation queries...(Copy from QueryLoader)
HolderInstantiator holderInstantiator = HolderInstantiator.getHolderInstantiator(
null,
resultTransformer,
getReturnAliasesForTransformer()
);
if ( holderInstantiator.isRequired() ) {
for ( int i = 0; i < results.size(); i++ ) {
Object[] row = ( Object[] ) results.get( i );
Object result = holderInstantiator.instantiate(row);
results.set( i, result );
}
return resultTransformer.transformList(results);
}
else {
return results;
}
}
private String[] getReturnAliasesForTransformer() {
return transformerAliases;
}
@Override
protected EntityAliases[] getEntityAliases() {
return entityAliases;
}
@Override
protected CollectionAliases[] getCollectionAliases() {
return collectionAliases;
}
@Override
public int[] getNamedParameterLocs(String name) throws QueryException {
Object loc = namedParameterBindPoints.get( name );
if ( loc == null ) {
throw new QueryException(
"Named parameter does not appear in Query: " + name,
sql
);
}
if ( loc instanceof Integer ) {
return new int[] { ( ( Integer ) loc ).intValue() };
}
else {
return ArrayHelper.toIntArray( ( List ) loc );
}
}
public class ResultRowProcessor {
private final boolean hasScalars;
private ResultColumnProcessor[] columnProcessors;
public ResultRowProcessor(boolean hasScalars, ResultColumnProcessor[] columnProcessors) {
this.hasScalars = hasScalars || ( columnProcessors == null || columnProcessors.length == 0 );
this.columnProcessors = columnProcessors;
}
public void prepareForAutoDiscovery(Metadata metadata) throws SQLException {
if ( columnProcessors == null || columnProcessors.length == 0 ) {
int columns = metadata.getColumnCount();
columnProcessors = new ResultColumnProcessor[ columns ];
for ( int i = 1; i <= columns; i++ ) {
columnProcessors[ i - 1 ] = new ScalarResultColumnProcessor( i );
}
}
}
/**
* Build a logical result row.
*
* At this point, Loader has already processed all non-scalar result data. We
* just need to account for scalar result data here...
*
* @param data Entity data defined as "root returns" and already handled by the
* normal Loader mechanism.
* @param resultSet The JDBC result set (positioned at the row currently being processed).
* @param hasTransformer Does this query have an associated {@link ResultTransformer}
* @param session The session from which the query request originated.
* @return The logical result row
* @throws SQLException
* @throws HibernateException
*/
public Object buildResultRow(
Object[] data,
ResultSet resultSet,
boolean hasTransformer,
SessionImplementor session) throws SQLException, HibernateException {
Object[] resultRow = buildResultRow( data, resultSet, session );
return ( hasTransformer )
? resultRow
: ( resultRow.length == 1 )
? resultRow[0]
: resultRow;
}
public Object[] buildResultRow(
Object[] data,
ResultSet resultSet,
SessionImplementor session) throws SQLException, HibernateException {
Object[] resultRow;
if ( !hasScalars ) {
resultRow = data;
}
else {
// build an array with indices equal to the total number
// of actual returns in the result Hibernate will return
// for this query (scalars + non-scalars)
resultRow = new Object[ columnProcessors.length ];
for ( int i = 0; i < columnProcessors.length; i++ ) {
resultRow[i] = columnProcessors[i].extract( data, resultSet, session );
}
}
return resultRow;
}
}
private static interface ResultColumnProcessor {
public Object extract(Object[] data, ResultSet resultSet, SessionImplementor session) throws SQLException, HibernateException;
public void performDiscovery(Metadata metadata, List types, List aliases) throws SQLException, HibernateException;
}
public class NonScalarResultColumnProcessor implements ResultColumnProcessor {
private final int position;
public NonScalarResultColumnProcessor(int position) {
this.position = position;
}
@Override
public Object extract(
Object[] data,
ResultSet resultSet,
SessionImplementor session) throws SQLException, HibernateException {
return data[ position ];
}
@Override
public void performDiscovery(Metadata metadata, List types, List aliases) {
}
}
public class ScalarResultColumnProcessor implements ResultColumnProcessor {
private int position = -1;
private String alias;
private Type type;
public ScalarResultColumnProcessor(int position) {
this.position = position;
}
public ScalarResultColumnProcessor(String alias, Type type) {
this.alias = alias;
this.type = type;
}
@Override
public Object extract(
Object[] data,
ResultSet resultSet,
SessionImplementor session) throws SQLException, HibernateException {
return type.nullSafeGet( resultSet, alias, session, null );
}
@Override
public void performDiscovery(Metadata metadata, List types, List aliases) throws SQLException {
if ( alias == null ) {
alias = metadata.getColumnName( position );
}
else if ( position < 0 ) {
position = metadata.resolveColumnPosition( alias );
}
if ( type == null ) {
type = metadata.getHibernateType( position );
}
types.add( type );
aliases.add( alias );
}
}
@Override
protected void autoDiscoverTypes(ResultSet rs) {
try {
Metadata metadata = new Metadata( getFactory(), rs );
rowProcessor.prepareForAutoDiscovery( metadata );
List aliases = new ArrayList();
List types = new ArrayList();
for ( int i = 0; i < rowProcessor.columnProcessors.length; i++ ) {
rowProcessor.columnProcessors[i].performDiscovery( metadata, types, aliases );
}
// lets make sure we did not end up with duplicate aliases. this can occur when the user supplied query
// did not rename same-named columns. e.g.:
// select u.username, u2.username from t_user u, t_user u2 ...
//
// the above will lead to an unworkable situation in most cases (the difference is how the driver/db
// handle this situation. But if the 'aliases' variable contains duplicate names, then we have that
// troublesome condition, so lets throw an error. See HHH-5992
final HashSet aliasesSet = new HashSet();
for ( String alias : aliases ) {
boolean alreadyExisted = !aliasesSet.add( alias );
if ( alreadyExisted ) {
throw new NonUniqueDiscoveredSqlAliasException(
"Encountered a duplicated sql alias [" + alias +
"] during auto-discovery of a native-sql query"
);
}
}
resultTypes = ArrayHelper.toTypeArray( types );
transformerAliases = ArrayHelper.toStringArray( aliases );
}
catch ( SQLException e ) {
throw new HibernateException( "Exception while trying to autodiscover types.", e );
}
}
private static class Metadata {
private final SessionFactoryImplementor factory;
private final ResultSet resultSet;
private final ResultSetMetaData resultSetMetaData;
public Metadata(SessionFactoryImplementor factory, ResultSet resultSet) throws HibernateException {
try {
this.factory = factory;
this.resultSet = resultSet;
this.resultSetMetaData = resultSet.getMetaData();
}
catch( SQLException e ) {
throw new HibernateException( "Could not extract result set metadata", e );
}
}
public int getColumnCount() throws HibernateException {
try {
return resultSetMetaData.getColumnCount();
}
catch( SQLException e ) {
throw new HibernateException( "Could not determine result set column count", e );
}
}
public int resolveColumnPosition(String columnName) throws HibernateException {
try {
return resultSet.findColumn( columnName );
}
catch( SQLException e ) {
throw new HibernateException( "Could not resolve column name in result set [" + columnName + "]", e );
}
}
public String getColumnName(int position) throws HibernateException {
try {
return factory.getDialect().getColumnAliasExtractor().extractColumnAlias( resultSetMetaData, position );
}
catch( SQLException e ) {
throw new HibernateException( "Could not resolve column name [" + position + "]", e );
}
}
public Type getHibernateType(int columnPos) throws SQLException {
int columnType = resultSetMetaData.getColumnType( columnPos );
int scale = resultSetMetaData.getScale( columnPos );
int precision = resultSetMetaData.getPrecision( columnPos );
int length = precision;
if ( columnType == 1 && precision == 0 ) {
length = resultSetMetaData.getColumnDisplaySize( columnPos );
}
return factory.getTypeResolver().heuristicType(
factory.getDialect().getHibernateTypeName(
columnType,
length,
precision,
scale
)
);
}
}
}
