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HHH-8498 - Full ConstructorResult handling
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124 changes: 124 additions & 0 deletions
124
...nate-core/src/main/java/org/hibernate/loader/custom/ConstructorResultColumnProcessor.java
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|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| /* | ||
| * Hibernate, Relational Persistence for Idiomatic Java | ||
| * | ||
| * Copyright (c) 2013, 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.lang.reflect.Constructor; | ||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.sql.ResultSet; | ||
| import java.sql.SQLException; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
|
|
||
| import org.hibernate.HibernateException; | ||
| import org.hibernate.engine.spi.SessionImplementor; | ||
| import org.hibernate.internal.util.type.PrimitiveWrapperHelper; | ||
| import org.hibernate.type.Type; | ||
|
|
||
| /** | ||
| * Represents a {@link javax.persistence.ConstructorResult} within the custom query. | ||
| * | ||
| * @author Steve Ebersole | ||
| */ | ||
| public class ConstructorResultColumnProcessor implements ResultColumnProcessor { | ||
| private final Class targetClass; | ||
| private final ScalarResultColumnProcessor[] scalarProcessors; | ||
|
|
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| private Constructor constructor; | ||
|
|
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| public ConstructorResultColumnProcessor(Class targetClass, ScalarResultColumnProcessor[] scalarProcessors) { | ||
| this.targetClass = targetClass; | ||
| this.scalarProcessors = scalarProcessors; | ||
| } | ||
|
|
||
| @Override | ||
| public void performDiscovery(JdbcResultMetadata metadata, List<Type> types, List<String> aliases) throws SQLException { | ||
| final List<Type> localTypes = new ArrayList<Type>(); | ||
| for ( ScalarResultColumnProcessor scalar : scalarProcessors ) { | ||
| scalar.performDiscovery( metadata, localTypes, aliases ); | ||
| } | ||
|
|
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| types.addAll( localTypes ); | ||
|
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| constructor = resolveConstructor( targetClass, localTypes ); | ||
| } | ||
|
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| @Override | ||
| public Object extract(Object[] data, ResultSet resultSet, SessionImplementor session) | ||
| throws SQLException, HibernateException { | ||
| if ( constructor == null ) { | ||
| throw new IllegalStateException( "Constructor to call was null" ); | ||
| } | ||
|
|
||
| final Object[] args = new Object[ scalarProcessors.length ]; | ||
| for ( int i = 0; i < scalarProcessors.length; i++ ) { | ||
| args[i] = scalarProcessors[i].extract( data, resultSet, session ); | ||
| } | ||
|
|
||
| try { | ||
| return constructor.newInstance( args ); | ||
| } | ||
| catch (InvocationTargetException e) { | ||
| throw new HibernateException( | ||
| String.format( "Unable to call %s constructor", constructor.getDeclaringClass() ), | ||
| e | ||
| ); | ||
| } | ||
| catch (Exception e) { | ||
| throw new HibernateException( | ||
| String.format( "Unable to call %s constructor", constructor.getDeclaringClass() ), | ||
| e | ||
| ); | ||
| } | ||
| } | ||
|
|
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| private static Constructor resolveConstructor(Class targetClass, List<Type> types) { | ||
| for ( Constructor constructor : targetClass.getConstructors() ) { | ||
| final Class[] argumentTypes = constructor.getParameterTypes(); | ||
| if ( argumentTypes.length != types.size() ) { | ||
| continue; | ||
| } | ||
|
|
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| boolean allMatched = true; | ||
| for ( int i = 0; i < argumentTypes.length; i++ ) { | ||
| if ( ! areAssignmentCompatible( argumentTypes[i], types.get( i ).getReturnedClass() ) ) { | ||
| allMatched = false; | ||
| break; | ||
| } | ||
| } | ||
| if ( !allMatched ) { | ||
| continue; | ||
| } | ||
|
|
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| return constructor; | ||
| } | ||
|
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| throw new IllegalArgumentException( "Could not locate appropriate constructor on class : " + targetClass.getName() ); | ||
| } | ||
|
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| @SuppressWarnings("unchecked") | ||
| private static boolean areAssignmentCompatible(Class argumentType, Class typeReturnedClass) { | ||
| return argumentType.isAssignableFrom( typeReturnedClass ) | ||
| || PrimitiveWrapperHelper.arePrimitiveWrapperEquivalents( argumentType, typeReturnedClass ); | ||
| } | ||
| } |
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