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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
*
* 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.engine.query;
import org.hibernate.hql.QuerySplitter;
import org.hibernate.hql.QueryTranslator;
import org.hibernate.hql.ParameterTranslations;
import org.hibernate.hql.FilterTranslator;
import org.hibernate.util.ArrayHelper;
import org.hibernate.util.EmptyIterator;
import org.hibernate.util.JoinedIterator;
import org.hibernate.util.IdentitySet;
import org.hibernate.HibernateException;
import org.hibernate.ScrollableResults;
import org.hibernate.QueryException;
import org.hibernate.type.Type;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.engine.QueryParameters;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.RowSelection;
import org.hibernate.event.EventSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.Serializable;
import java.util.Map;
import java.util.Set;
import java.util.HashSet;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.HashMap;
/**
* Defines a query execution plan for an HQL query (or filter).
*
* @author Steve Ebersole
*/
public class HQLQueryPlan implements Serializable {
// TODO : keep seperate notions of QT[] here for shallow/non-shallow queries...
private static final Logger log = LoggerFactory.getLogger( HQLQueryPlan.class );
private final String sourceQuery;
private final QueryTranslator[] translators;
private final String[] sqlStrings;
private final ParameterMetadata parameterMetadata;
private final ReturnMetadata returnMetadata;
private final Set querySpaces;
private final Set enabledFilterNames;
private final boolean shallow;
public HQLQueryPlan(String hql, boolean shallow, Map enabledFilters, SessionFactoryImplementor factory) {
this( hql, null, shallow, enabledFilters, factory );
}
protected HQLQueryPlan(String hql, String collectionRole, boolean shallow, Map enabledFilters, SessionFactoryImplementor factory) {
this.sourceQuery = hql;
this.shallow = shallow;
Set copy = new HashSet();
copy.addAll( enabledFilters.keySet() );
this.enabledFilterNames = java.util.Collections.unmodifiableSet( copy );
Set combinedQuerySpaces = new HashSet();
String[] concreteQueryStrings = QuerySplitter.concreteQueries( hql, factory );
final int length = concreteQueryStrings.length;
translators = new QueryTranslator[length];
List sqlStringList = new ArrayList();
for ( int i=0; i 1 ) {
final int returns = translators[0].getReturnTypes().length;
returnMetadata = new ReturnMetadata( translators[0].getReturnAliases(), new Type[returns] );
}
else {
returnMetadata = new ReturnMetadata( translators[0].getReturnAliases(), translators[0].getReturnTypes() );
}
}
}
}
public String getSourceQuery() {
return sourceQuery;
}
public Set getQuerySpaces() {
return querySpaces;
}
public ParameterMetadata getParameterMetadata() {
return parameterMetadata;
}
public ReturnMetadata getReturnMetadata() {
return returnMetadata;
}
public Set getEnabledFilterNames() {
return enabledFilterNames;
}
public String[] getSqlStrings() {
return sqlStrings;
}
public Set getUtilizedFilterNames() {
// TODO : add this info to the translator and aggregate it here...
return null;
}
public boolean isShallow() {
return shallow;
}
public List performList(
QueryParameters queryParameters,
SessionImplementor session) throws HibernateException {
if ( log.isTraceEnabled() ) {
log.trace( "find: " + getSourceQuery() );
queryParameters.traceParameters( session.getFactory() );
}
boolean hasLimit = queryParameters.getRowSelection() != null &&
queryParameters.getRowSelection().definesLimits();
boolean needsLimit = hasLimit && translators.length > 1;
QueryParameters queryParametersToUse;
if ( needsLimit ) {
log.warn( "firstResult/maxResults specified on polymorphic query; applying in memory!" );
RowSelection selection = new RowSelection();
selection.setFetchSize( queryParameters.getRowSelection().getFetchSize() );
selection.setTimeout( queryParameters.getRowSelection().getTimeout() );
queryParametersToUse = queryParameters.createCopyUsing( selection );
}
else {
queryParametersToUse = queryParameters;
}
List combinedResults = new ArrayList();
IdentitySet distinction = new IdentitySet();
int includedCount = -1;
translator_loop: for ( int i = 0; i < translators.length; i++ ) {
List tmp = translators[i].list( session, queryParametersToUse );
if ( needsLimit ) {
// NOTE : firstRow is zero-based
int first = queryParameters.getRowSelection().getFirstRow() == null
? 0
: queryParameters.getRowSelection().getFirstRow().intValue();
int max = queryParameters.getRowSelection().getMaxRows() == null
? -1
: queryParameters.getRowSelection().getMaxRows().intValue();
final int size = tmp.size();
for ( int x = 0; x < size; x++ ) {
final Object result = tmp.get( x );
if ( ! distinction.add( result ) ) {
continue;
}
includedCount++;
if ( includedCount < first ) {
continue;
}
combinedResults.add( result );
if ( max >= 0 && includedCount > max ) {
// break the outer loop !!!
break translator_loop;
}
}
}
else {
combinedResults.addAll( tmp );
}
}
return combinedResults;
}
public Iterator performIterate(
QueryParameters queryParameters,
EventSource session) throws HibernateException {
if ( log.isTraceEnabled() ) {
log.trace( "iterate: " + getSourceQuery() );
queryParameters.traceParameters( session.getFactory() );
}
if ( translators.length == 0 ) {
return EmptyIterator.INSTANCE;
}
Iterator[] results = null;
boolean many = translators.length > 1;
if (many) {
results = new Iterator[translators.length];
}
Iterator result = null;
for ( int i = 0; i < translators.length; i++ ) {
result = translators[i].iterate( queryParameters, session );
if (many) results[i] = result;
}
return many ? new JoinedIterator(results) : result;
}
public ScrollableResults performScroll(
QueryParameters queryParameters,
SessionImplementor session) throws HibernateException {
if ( log.isTraceEnabled() ) {
log.trace( "iterate: " + getSourceQuery() );
queryParameters.traceParameters( session.getFactory() );
}
if ( translators.length != 1 ) {
throw new QueryException( "implicit polymorphism not supported for scroll() queries" );
}
if ( queryParameters.getRowSelection().definesLimits() && translators[0].containsCollectionFetches() ) {
throw new QueryException( "firstResult/maxResults not supported in conjunction with scroll() of a query containing collection fetches" );
}
return translators[0].scroll( queryParameters, session );
}
public int performExecuteUpdate(QueryParameters queryParameters, SessionImplementor session)
throws HibernateException {
if ( log.isTraceEnabled() ) {
log.trace( "executeUpdate: " + getSourceQuery() );
queryParameters.traceParameters( session.getFactory() );
}
if ( translators.length != 1 ) {
log.warn( "manipulation query [" + getSourceQuery() + "] resulted in [" + translators.length + "] split queries" );
}
int result = 0;
for ( int i = 0; i < translators.length; i++ ) {
result += translators[i].executeUpdate( queryParameters, session );
}
return result;
}
private ParameterMetadata buildParameterMetadata(ParameterTranslations parameterTranslations, String hql) {
long start = System.currentTimeMillis();
ParamLocationRecognizer recognizer = ParamLocationRecognizer.parseLocations( hql );
long end = System.currentTimeMillis();
if ( log.isTraceEnabled() ) {
log.trace( "HQL param location recognition took " + (end - start) + " mills (" + hql + ")" );
}
int ordinalParamCount = parameterTranslations.getOrdinalParameterCount();
int[] locations = ArrayHelper.toIntArray( recognizer.getOrdinalParameterLocationList() );
if ( parameterTranslations.supportsOrdinalParameterMetadata() && locations.length != ordinalParamCount ) {
throw new HibernateException( "ordinal parameter mismatch" );
}
ordinalParamCount = locations.length;
OrdinalParameterDescriptor[] ordinalParamDescriptors = new OrdinalParameterDescriptor[ordinalParamCount];
for ( int i = 1; i <= ordinalParamCount; i++ ) {
ordinalParamDescriptors[ i - 1 ] = new OrdinalParameterDescriptor(
i,
parameterTranslations.supportsOrdinalParameterMetadata()
? parameterTranslations.getOrdinalParameterExpectedType( i )
: null,
locations[ i - 1 ]
);
}
Iterator itr = recognizer.getNamedParameterDescriptionMap().entrySet().iterator();
Map namedParamDescriptorMap = new HashMap();
while( itr.hasNext() ) {
final Map.Entry entry = ( Map.Entry ) itr.next();
final String name = ( String ) entry.getKey();
final ParamLocationRecognizer.NamedParameterDescription description =
( ParamLocationRecognizer.NamedParameterDescription ) entry.getValue();
namedParamDescriptorMap.put(
name,
new NamedParameterDescriptor(
name,
parameterTranslations.getNamedParameterExpectedType( name ),
description.buildPositionsArray(),
description.isJpaStyle()
)
);
}
return new ParameterMetadata( ordinalParamDescriptors, namedParamDescriptorMap );
}
public QueryTranslator[] getTranslators() {
QueryTranslator[] copy = new QueryTranslator[translators.length];
System.arraycopy(translators, 0, copy, 0, copy.length);
return copy;
}
}
