/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, 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.cfg.annotations;
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 javax.persistence.ColumnResult;
import javax.persistence.EntityResult;
import javax.persistence.FieldResult;
import javax.persistence.SqlResultSetMapping;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.LockMode;
import org.hibernate.MappingException;
import org.hibernate.cfg.BinderHelper;
import org.hibernate.cfg.Mappings;
import org.hibernate.cfg.QuerySecondPass;
import org.hibernate.engine.ResultSetMappingDefinition;
import org.hibernate.engine.query.spi.sql.NativeSQLQueryRootReturn;
import org.hibernate.engine.query.spi.sql.NativeSQLQueryScalarReturn;
import org.hibernate.internal.util.StringHelper;
import org.hibernate.mapping.Component;
import org.hibernate.mapping.PersistentClass;
import org.hibernate.mapping.Property;
import org.hibernate.mapping.ToOne;
import org.hibernate.mapping.Value;
import org.jboss.logging.Logger;
/**
* @author Emmanuel Bernard
*/
public class ResultsetMappingSecondPass implements QuerySecondPass {
private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class,
ResultsetMappingSecondPass.class.getName());
private SqlResultSetMapping ann;
private Mappings mappings;
private boolean isDefault;
public ResultsetMappingSecondPass(SqlResultSetMapping ann, Mappings mappings, boolean isDefault) {
this.ann = ann;
this.mappings = mappings;
this.isDefault = isDefault;
}
public void doSecondPass(Map persistentClasses) throws MappingException {
//TODO add parameters checkings
if ( ann == null ) return;
ResultSetMappingDefinition definition = new ResultSetMappingDefinition( ann.name() );
LOG.debugf( "Binding result set mapping: %s", definition.getName() );
int entityAliasIndex = 0;
for (EntityResult entity : ann.entities()) {
//TODO parameterize lock mode?
List<FieldResult> properties = new ArrayList<FieldResult>();
List<String> propertyNames = new ArrayList<String>();
for (FieldResult field : entity.fields()) {
//use an ArrayList cause we might have several columns per root property
String name = field.name();
if ( name.indexOf( '.' ) == -1 ) {
//regular property
properties.add( field );
propertyNames.add( name );
}
else {
/**
* Reorder properties
* 1. get the parent property
* 2. list all the properties following the expected one in the parent property
* 3. calculate the lowest index and insert the property
*/
PersistentClass pc = mappings.getClass( entity.entityClass().getName() );
if ( pc == null ) {
throw new MappingException(
"Entity not found " + entity.entityClass().getName()
+ " in SqlResultsetMapping " + ann.name()
);
}
int dotIndex = name.lastIndexOf( '.' );
String reducedName = name.substring( 0, dotIndex );
Iterator parentPropIter = getSubPropertyIterator( pc, reducedName );
List followers = getFollowers( parentPropIter, reducedName, name );
int index = propertyNames.size();
int followersSize = followers.size();
for (int loop = 0; loop < followersSize; loop++) {
String follower = (String) followers.get( loop );
int currentIndex = getIndexOfFirstMatchingProperty( propertyNames, follower );
index = currentIndex != -1 && currentIndex < index ? currentIndex : index;
}
propertyNames.add( index, name );
properties.add( index, field );
}
}
Set<String> uniqueReturnProperty = new HashSet<String>();
Map<String, ArrayList<String>> propertyResultsTmp = new HashMap<String, ArrayList<String>>();
for ( Object property : properties ) {
final FieldResult propertyresult = ( FieldResult ) property;
final String name = propertyresult.name();
if ( "class".equals( name ) ) {
throw new MappingException(
"class is not a valid property name to use in a @FieldResult, use @Entity(discriminatorColumn) instead"
);
}
if ( uniqueReturnProperty.contains( name ) ) {
throw new MappingException(
"duplicate @FieldResult for property " + name +
" on @Entity " + entity.entityClass().getName() + " in " + ann.name()
);
}
uniqueReturnProperty.add( name );
final String quotingNormalizedColumnName = mappings.getObjectNameNormalizer()
.normalizeIdentifierQuoting( propertyresult.column() );
String key = StringHelper.root( name );
ArrayList<String> intermediateResults = propertyResultsTmp.get( key );
if ( intermediateResults == null ) {
intermediateResults = new ArrayList<String>();
propertyResultsTmp.put( key, intermediateResults );
}
intermediateResults.add( quotingNormalizedColumnName );
}
Map<String, String[]> propertyResults = new HashMap<String,String[]>();
for ( Map.Entry<String, ArrayList<String>> entry : propertyResultsTmp.entrySet() ) {
propertyResults.put(
entry.getKey(),
entry.getValue().toArray( new String[ entry.getValue().size() ] )
);
}
if ( !BinderHelper.isEmptyAnnotationValue( entity.discriminatorColumn() ) ) {
final String quotingNormalizedName = mappings.getObjectNameNormalizer().normalizeIdentifierQuoting(
entity.discriminatorColumn()
);
propertyResults.put( "class", new String[] { quotingNormalizedName } );
}
if ( propertyResults.isEmpty() ) {
propertyResults = java.util.Collections.emptyMap();
}
NativeSQLQueryRootReturn result = new NativeSQLQueryRootReturn(
"alias" + entityAliasIndex++,
entity.entityClass().getName(),
propertyResults,
LockMode.READ
);
definition.addQueryReturn( result );
}
for ( ColumnResult column : ann.columns() ) {
definition.addQueryReturn(
new NativeSQLQueryScalarReturn(
mappings.getObjectNameNormalizer().normalizeIdentifierQuoting(
column.name()
),
null
)
);
}
if ( isDefault ) {
mappings.addDefaultResultSetMapping( definition );
}
else {
mappings.addResultSetMapping( definition );
}
}
@SuppressWarnings({ "unchecked" })
private List getFollowers(Iterator parentPropIter, String reducedName, String name) {
boolean hasFollowers = false;
List followers = new ArrayList();
while ( parentPropIter.hasNext() ) {
String currentPropertyName = ( (Property) parentPropIter.next() ).getName();
String currentName = reducedName + '.' + currentPropertyName;
if ( hasFollowers ) {
followers.add( currentName );
}
if ( name.equals( currentName ) ) hasFollowers = true;
}
return followers;
}
private Iterator getSubPropertyIterator(PersistentClass pc, String reducedName) {
Value value = pc.getRecursiveProperty( reducedName ).getValue();
Iterator parentPropIter;
if ( value instanceof Component ) {
Component comp = (Component) value;
parentPropIter = comp.getPropertyIterator();
}
else if ( value instanceof ToOne ) {
ToOne toOne = (ToOne) value;
PersistentClass referencedPc = mappings.getClass( toOne.getReferencedEntityName() );
if ( toOne.getReferencedPropertyName() != null ) {
try {
parentPropIter = ( (Component) referencedPc.getRecursiveProperty(
toOne.getReferencedPropertyName()
).getValue() ).getPropertyIterator();
}
catch (ClassCastException e) {
throw new MappingException(
"dotted notation reference neither a component nor a many/one to one", e
);
}
}
else {
try {
if ( referencedPc.getIdentifierMapper() == null ) {
parentPropIter = ( (Component) referencedPc.getIdentifierProperty()
.getValue() ).getPropertyIterator();
}
else {
parentPropIter = referencedPc.getIdentifierMapper().getPropertyIterator();
}
}
catch (ClassCastException e) {
throw new MappingException(
"dotted notation reference neither a component nor a many/one to one", e
);
}
}
}
else {
throw new MappingException( "dotted notation reference neither a component nor a many/one to one" );
}
return parentPropIter;
}
private static int getIndexOfFirstMatchingProperty(List propertyNames, String follower) {
int propertySize = propertyNames.size();
for (int propIndex = 0; propIndex < propertySize; propIndex++) {
if ( ( (String) propertyNames.get( propIndex ) ).startsWith( follower ) ) {
return propIndex;
}
}
return -1;
}
}