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/*
* 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.hql;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.QueryException;
import org.hibernate.ScrollableResults;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.QueryParameters;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.event.spi.EventSource;
import org.hibernate.hql.internal.HolderInstantiator;
import org.hibernate.hql.internal.ast.QueryTranslatorImpl;
import org.hibernate.hql.internal.ast.tree.AggregatedSelectExpression;
import org.hibernate.hql.internal.ast.tree.FromElement;
import org.hibernate.hql.internal.ast.tree.QueryNode;
import org.hibernate.hql.internal.ast.tree.SelectClause;
import org.hibernate.internal.IteratorImpl;
import org.hibernate.internal.util.collections.ArrayHelper;
import org.hibernate.loader.BasicLoader;
import org.hibernate.param.ParameterSpecification;
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.EntityType;
import org.hibernate.type.Type;
/**
* A delegate that implements the Loader part of QueryTranslator.
*
* @author josh
*/
public class QueryLoader extends BasicLoader {
/**
* The query translator that is delegating to this object.
*/
private QueryTranslatorImpl queryTranslator;
private Queryable[] entityPersisters;
private String[] entityAliases;
private String[] sqlAliases;
private String[] sqlAliasSuffixes;
private boolean[] includeInSelect;
private String[] collectionSuffixes;
private boolean hasScalars;
private String[][] scalarColumnNames;
//private Type[] sqlResultTypes;
private Type[] queryReturnTypes;
private final Map sqlAliasByEntityAlias = new HashMap(8);
private EntityType[] ownerAssociationTypes;
private int[] owners;
private boolean[] entityEagerPropertyFetches;
private int[] collectionOwners;
private QueryableCollection[] collectionPersisters;
private int selectLength;
private AggregatedSelectExpression aggregatedSelectExpression;
private String[] queryReturnAliases;
private LockMode[] defaultLockModes;
/**
* Creates a new Loader implementation.
*
* @param queryTranslator The query translator that is the delegator.
* @param factory The factory from which this loader is being created.
* @param selectClause The AST representing the select clause for loading.
*/
public QueryLoader(
final QueryTranslatorImpl queryTranslator,
final SessionFactoryImplementor factory,
final SelectClause selectClause) {
super( factory );
this.queryTranslator = queryTranslator;
initialize( selectClause );
postInstantiate();
}
private void initialize(SelectClause selectClause) {
List fromElementList = selectClause.getFromElementsForLoad();
hasScalars = selectClause.isScalarSelect();
scalarColumnNames = selectClause.getColumnNames();
//sqlResultTypes = selectClause.getSqlResultTypes();
queryReturnTypes = selectClause.getQueryReturnTypes();
aggregatedSelectExpression = selectClause.getAggregatedSelectExpression();
queryReturnAliases = selectClause.getQueryReturnAliases();
List collectionFromElements = selectClause.getCollectionFromElements();
if ( collectionFromElements != null && collectionFromElements.size()!=0 ) {
int length = collectionFromElements.size();
collectionPersisters = new QueryableCollection[length];
collectionOwners = new int[length];
collectionSuffixes = new String[length];
for ( int i=0; i afterLoadActions) throws QueryException {
// can't cache this stuff either (per-invocation)
// we are given a map of user-alias -> lock mode
// create a new map of sql-alias -> lock mode
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...
if ( shouldUseFollowOnLocking( parameters, dialect, afterLoadActions ) ) {
return sql;
}
// there are other conditions we might want to add here, such as checking the result types etc
// but those are better served after we have redone the SQL generation to use ASTs.
// we need both the set of locks and the columns to reference in locks
// as the ultimate output of this section...
final LockOptions locks = new LockOptions( lockOptions.getLockMode() );
final Map keyColumnNames = dialect.forUpdateOfColumns() ? new HashMap() : null;
locks.setScope( lockOptions.getScope() );
locks.setTimeOut( lockOptions.getTimeOut() );
final Iterator itr = sqlAliasByEntityAlias.entrySet().iterator();
while ( itr.hasNext() ) {
final Map.Entry entry = (Map.Entry) itr.next();
final String userAlias = (String) entry.getKey();
final String drivingSqlAlias = (String) entry.getValue();
if ( drivingSqlAlias == null ) {
throw new IllegalArgumentException( "could not locate alias to apply lock mode : " + userAlias );
}
// at this point we have (drivingSqlAlias) the SQL alias of the driving table
// corresponding to the given user alias. However, the driving table is not
// (necessarily) the table against which we want to apply locks. Mainly,
// the exception case here is joined-subclass hierarchies where we instead
// want to apply the lock against the root table (for all other strategies,
// it just happens that driving and root are the same).
final QueryNode select = ( QueryNode ) queryTranslator.getSqlAST();
final Lockable drivingPersister = ( Lockable ) select.getFromClause()
.findFromElementByUserOrSqlAlias( userAlias, drivingSqlAlias )
.getQueryable();
final String sqlAlias = drivingPersister.getRootTableAlias( drivingSqlAlias );
final LockMode effectiveLockMode = lockOptions.getEffectiveLockMode( userAlias );
locks.setAliasSpecificLockMode( sqlAlias, effectiveLockMode );
if ( keyColumnNames != null ) {
keyColumnNames.put( sqlAlias, drivingPersister.getRootTableIdentifierColumnNames() );
}
}
// apply the collected locks and columns
return dialect.applyLocksToSql( sql, locks, keyColumnNames );
}
protected void applyPostLoadLocks(Object[] row, LockMode[] lockModesArray, SessionImplementor session) {
// todo : scalars???
// if ( row.length != lockModesArray.length ) {
// return;
// }
//
// for ( int i = 0; i < lockModesArray.length; i++ ) {
// if ( LockMode.OPTIMISTIC_FORCE_INCREMENT.equals( lockModesArray[i] ) ) {
// final EntityEntry pcEntry =
// }
// else if ( LockMode.PESSIMISTIC_FORCE_INCREMENT.equals( lockModesArray[i] ) ) {
//
// }
// }
}
protected boolean upgradeLocks() {
return true;
}
private boolean hasSelectNew() {
return aggregatedSelectExpression != null && aggregatedSelectExpression.getResultTransformer() != null;
}
protected String[] getResultRowAliases() {
return queryReturnAliases;
}
protected ResultTransformer resolveResultTransformer(ResultTransformer resultTransformer) {
final ResultTransformer implicitResultTransformer = aggregatedSelectExpression == null
? null
: aggregatedSelectExpression.getResultTransformer();
return HolderInstantiator.resolveResultTransformer( implicitResultTransformer, resultTransformer );
}
protected boolean[] includeInResultRow() {
boolean[] includeInResultTuple = includeInSelect;
if ( hasScalars ) {
includeInResultTuple = new boolean[ queryReturnTypes.length ];
Arrays.fill( includeInResultTuple, true );
}
return includeInResultTuple;
}
protected Object getResultColumnOrRow(Object[] row, ResultTransformer transformer, ResultSet rs, SessionImplementor session)
throws SQLException, HibernateException {
Object[] resultRow = getResultRow( row, rs, session );
boolean hasTransform = hasSelectNew() || transformer!=null;
return ( ! hasTransform && resultRow.length == 1 ?
resultRow[ 0 ] :
resultRow
);
}
protected Object[] getResultRow(Object[] row, ResultSet rs, SessionImplementor session)
throws SQLException, HibernateException {
Object[] resultRow;
if ( hasScalars ) {
String[][] scalarColumns = scalarColumnNames;
int queryCols = queryReturnTypes.length;
resultRow = new Object[queryCols];
for ( int i = 0; i < queryCols; i++ ) {
resultRow[i] = queryReturnTypes[i].nullSafeGet( rs, scalarColumns[i], session, null );
}
}
else {
resultRow = toResultRow( row );
}
return resultRow;
}
protected List getResultList(List results, ResultTransformer resultTransformer) throws QueryException {
// meant to handle dynamic instantiation queries...
HolderInstantiator holderInstantiator = buildHolderInstantiator( resultTransformer );
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 );
}
if ( !hasSelectNew() && resultTransformer != null ) {
return resultTransformer.transformList(results);
}
else {
return results;
}
}
else {
return results;
}
}
private HolderInstantiator buildHolderInstantiator(ResultTransformer queryLocalResultTransformer) {
final ResultTransformer implicitResultTransformer = aggregatedSelectExpression == null
? null
: aggregatedSelectExpression.getResultTransformer();
return HolderInstantiator.getHolderInstantiator(
implicitResultTransformer,
queryLocalResultTransformer,
queryReturnAliases
);
}
// --- Query translator methods ---
public List list(
SessionImplementor session,
QueryParameters queryParameters) throws HibernateException {
checkQuery( queryParameters );
return list( session, queryParameters, queryTranslator.getQuerySpaces(), queryReturnTypes );
}
private void checkQuery(QueryParameters queryParameters) {
if ( hasSelectNew() && queryParameters.getResultTransformer() != null ) {
throw new QueryException( "ResultTransformer is not allowed for 'select new' queries." );
}
}
public Iterator iterate(
QueryParameters queryParameters,
EventSource session) throws HibernateException {
checkQuery( queryParameters );
final boolean stats = session.getFactory().getStatistics().isStatisticsEnabled();
long startTime = 0;
if ( stats ) {
startTime = System.currentTimeMillis();
}
try {
if ( queryParameters.isCallable() ) {
throw new QueryException("iterate() not supported for callable statements");
}
final SqlStatementWrapper wrapper = executeQueryStatement( queryParameters, false, Collections.emptyList(), session );
final ResultSet rs = wrapper.getResultSet();
final PreparedStatement st = (PreparedStatement) wrapper.getStatement();
final Iterator result = new IteratorImpl(
rs,
st,
session,
queryParameters.isReadOnly( session ),
queryReturnTypes,
queryTranslator.getColumnNames(),
buildHolderInstantiator( queryParameters.getResultTransformer() )
);
if ( stats ) {
session.getFactory().getStatisticsImplementor().queryExecuted(
// "HQL: " + queryTranslator.getQueryString(),
getQueryIdentifier(),
0,
System.currentTimeMillis() - startTime
);
}
return result;
}
catch ( SQLException sqle ) {
throw getFactory().getSQLExceptionHelper().convert(
sqle,
"could not execute query using iterate",
getSQLString()
);
}
}
public ScrollableResults scroll(
final QueryParameters queryParameters,
final SessionImplementor session) throws HibernateException {
checkQuery( queryParameters );
return scroll(
queryParameters,
queryReturnTypes,
buildHolderInstantiator( queryParameters.getResultTransformer() ),
session
);
}
// -- Implementation private methods --
private Object[] toResultRow(Object[] row) {
if ( selectLength == row.length ) {
return row;
}
else {
Object[] result = new Object[selectLength];
int j = 0;
for ( int i = 0; i < row.length; i++ ) {
if ( includeInSelect[i] ) {
result[j++] = row[i];
}
}
return result;
}
}
/**
* Returns the locations of all occurrences of the named parameter.
*/
public int[] getNamedParameterLocs(String name) throws QueryException {
return queryTranslator.getParameterTranslations().getNamedParameterSqlLocations( name );
}
/**
* We specifically override this method here, because in general we know much more
* about the parameters and their appropriate bind positions here then we do in
* our super because we track them explciitly here through the ParameterSpecification
* interface.
*
* @param queryParameters The encapsulation of the parameter values to be bound.
* @param startIndex The position from which to start binding parameter values.
* @param session The originating session.
* @return The number of JDBC bind positions actually bound during this method execution.
* @throws SQLException Indicates problems performing the binding.
*/
protected int bindParameterValues(
final PreparedStatement statement,
final QueryParameters queryParameters,
final int startIndex,
final SessionImplementor session) throws SQLException {
// int position = bindFilterParameterValues( statement, queryParameters, startIndex, session );
int position = startIndex;
// List parameterSpecs = queryTranslator.getSqlAST().getWalker().getParameters();
List parameterSpecs = queryTranslator.getCollectedParameterSpecifications();
Iterator itr = parameterSpecs.iterator();
while ( itr.hasNext() ) {
ParameterSpecification spec = ( ParameterSpecification ) itr.next();
position += spec.bind( statement, queryParameters, session, position );
}
return position - startIndex;
}
private int bindFilterParameterValues(
PreparedStatement st,
QueryParameters queryParameters,
int position,
SessionImplementor session) throws SQLException {
// todo : better to handle dynamic filters through implicit DynamicFilterParameterSpecification
// see the discussion there in DynamicFilterParameterSpecification's javadocs as to why
// it is currently not done that way.
int filteredParamCount = queryParameters.getFilteredPositionalParameterTypes() == null
? 0
: queryParameters.getFilteredPositionalParameterTypes().length;
int nonfilteredParamCount = queryParameters.getPositionalParameterTypes() == null
? 0
: queryParameters.getPositionalParameterTypes().length;
int filterParamCount = filteredParamCount - nonfilteredParamCount;
for ( int i = 0; i < filterParamCount; i++ ) {
Type type = queryParameters.getFilteredPositionalParameterTypes()[i];
Object value = queryParameters.getFilteredPositionalParameterValues()[i];
type.nullSafeSet( st, value, position, session );
position += type.getColumnSpan( getFactory() );
}
return position;
}
}
