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experiment with allowing single-item auto-instantiation
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57 changes: 57 additions & 0 deletions
57
...ate-core/src/main/java/org/hibernate/sql/results/internal/RowTransformerCheckingImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /* | ||
| * Hibernate, Relational Persistence for Idiomatic Java | ||
| * | ||
| * License: GNU Lesser General Public License (LGPL), version 2.1 or later | ||
| * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html | ||
| */ | ||
|
|
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| package org.hibernate.sql.results.internal; | ||
|
|
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| import org.hibernate.TypeMismatchException; | ||
| import org.hibernate.sql.results.spi.RowTransformer; | ||
|
|
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| import java.util.Map; | ||
|
|
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| /** | ||
| * @author Gavin King | ||
| */ | ||
| public class RowTransformerCheckingImpl<R> implements RowTransformer<R> { | ||
|
|
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| private final Class<R> type; | ||
| private final Class<?> objectType; | ||
|
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| private static final Map<Class<?>,Class<?>> WRAPPERS | ||
| = Map.of( | ||
| boolean.class, Boolean.class, | ||
| int.class, Integer.class, | ||
| long.class, Long.class, | ||
| short.class, Short.class, | ||
| byte.class, Byte.class, | ||
| float.class, Float.class, | ||
| double.class, Double.class, | ||
| char.class, Character.class | ||
| ); | ||
|
|
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| public RowTransformerCheckingImpl(Class<R> type) { | ||
| this.type = type; | ||
| objectType = WRAPPERS.getOrDefault(type, type); | ||
| } | ||
|
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| @Override | ||
| @SuppressWarnings("unchecked") | ||
| public R transformRow(Object[] row) { | ||
| final Object result = row[0]; | ||
| if ( result == null || objectType.isInstance( result ) ) { | ||
| return (R) result; | ||
| } | ||
| else { | ||
| throw new TypeMismatchException( "Result type is '" + type.getSimpleName() | ||
| + "' but the query returned a '" + result.getClass().getSimpleName() + "'" ); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public int determineNumberOfResultElements(int rawElementCount) { | ||
| return 1; | ||
| } | ||
| } |
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