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Implement a hibernate type for enums (#446)
* Implement a hibernate type for enums Leverage GenericCollectionUserType to store enum fields as an array of strings. * Changes requested in review * Remove extraneous import Curiously, this causes checkstyle to fail now that the import was /removed from a comment./
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3 changed files with 127 additions and 1 deletions
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// Copyright 2020 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.persistence;
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import java.util.HashSet;
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import java.util.Set;
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/** Abstract Hibernate user type for storing/retrieving {@link Set<Enum<E>>}. */
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public class EnumSetUserType<E extends Enum<E>> extends GenericCollectionUserType<Set<Enum<E>>> {
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@Override
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Set<Enum<E>> getNewCollection() {
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return new HashSet<Enum<E>>();
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}
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@Override
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ArrayColumnType getColumnType() {
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return ArrayColumnType.STRING;
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}
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@Override
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public Class returnedClass() {
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return Set.class;
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}
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}
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@ -66,7 +66,7 @@ public abstract class GenericCollectionUserType<T extends Collection> extends Mu
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if (rs.getArray(names[0]) != null) {
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T result = getNewCollection();
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for (Object element : (Object[]) rs.getArray(names[0]).getArray()) {
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result.add(element);
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result.add(convertToElem(element));
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}
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return result;
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}
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@ -85,4 +85,14 @@ public abstract class GenericCollectionUserType<T extends Collection> extends Mu
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Array arr = st.getConnection().createArrayOf(getColumnType().getTypeName(), list.toArray());
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st.setArray(index, arr);
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}
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/**
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* Override this to convert an element value retrieved from the database to a different type.
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*
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* <p>This method is useful when encoding a java type to one of the types that can be used as an
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* array element.
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*/
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protected Object convertToElem(Object columnValue) {
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return columnValue;
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}
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}
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@ -0,0 +1,79 @@
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// Copyright 2020 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.persistence;
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import static com.google.common.truth.Truth.assertThat;
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import static google.registry.model.transaction.TransactionManagerFactory.jpaTm;
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import com.google.common.collect.ImmutableSet;
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import google.registry.model.transaction.JpaTestRules;
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import google.registry.model.transaction.JpaTestRules.JpaUnitTestRule;
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import java.util.Set;
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import javax.persistence.Entity;
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import javax.persistence.Id;
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import org.hibernate.annotations.Type;
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import org.junit.Rule;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.junit.runners.JUnit4;
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/** Unit tests for {@link EnumSetUserType}. */
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@RunWith(JUnit4.class)
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public class EnumSetUserTypeTest {
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@Rule
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public final JpaUnitTestRule jpaRule =
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new JpaTestRules.Builder().withEntityClass(TestEntity.class).buildUnitTestRule();
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public EnumSetUserTypeTest() {}
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@Test
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public void testRoundTrip() {
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Set<TestEnum> enums = ImmutableSet.of(TestEnum.BAR, TestEnum.FOO);
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TestEntity obj = new TestEntity("foo", enums);
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jpaTm().transact(() -> jpaTm().getEntityManager().persist(obj));
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TestEntity persisted =
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jpaTm().transact(() -> jpaTm().getEntityManager().find(TestEntity.class, "foo"));
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assertThat(persisted.data).isEqualTo(enums);
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}
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enum TestEnum {
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FOO,
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BAR,
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BAZ;
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public static class TestEnumType extends EnumSetUserType<TestEnum> {
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@Override
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protected Object convertToElem(Object value) {
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return TestEnum.valueOf((String) value);
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}
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}
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}
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@Entity(name = "TestEntity")
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static class TestEntity {
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@Id String name;
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@Type(type = "google.registry.persistence.EnumSetUserTypeTest$TestEnum$TestEnumType")
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Set<TestEnum> data;
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TestEntity() {}
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TestEntity(String name, Set<TestEnum> data) {
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this.name = name;
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this.data = data;
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}
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}
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}
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