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Separate MapperContext into interface and implementation
This allows us to hide the details of how contexts are mutated, which are irrelevant to end users. In the generated code, Mapper implementations use DefaultMapperContext, but DAO implementations only need MapperContext because they don't mutate it.
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99 changes: 99 additions & 0 deletions
99
...r-runtime/src/main/java/com/datastax/oss/driver/internal/mapper/DefaultMapperContext.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /* | ||
| * Copyright DataStax, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.datastax.oss.driver.internal.mapper; | ||
|
|
||
| import com.datastax.oss.driver.api.core.CqlIdentifier; | ||
| import com.datastax.oss.driver.api.core.CqlSession; | ||
| import com.datastax.oss.driver.api.mapper.MapperContext; | ||
| import com.datastax.oss.driver.api.mapper.entity.naming.NameConverter; | ||
| import edu.umd.cs.findbugs.annotations.NonNull; | ||
| import edu.umd.cs.findbugs.annotations.Nullable; | ||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.util.Objects; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import java.util.concurrent.ConcurrentMap; | ||
|
|
||
| public class DefaultMapperContext implements MapperContext { | ||
|
|
||
| private final CqlSession session; | ||
| private final CqlIdentifier keyspaceId; | ||
| private final CqlIdentifier tableId; | ||
| private final ConcurrentMap<Class<? extends NameConverter>, NameConverter> nameConverterCache; | ||
|
|
||
| public DefaultMapperContext(@NonNull CqlSession session) { | ||
| this(session, null, null, new ConcurrentHashMap<>()); | ||
| } | ||
|
|
||
| private DefaultMapperContext( | ||
| CqlSession session, | ||
| CqlIdentifier keyspaceId, | ||
| CqlIdentifier tableId, | ||
| ConcurrentMap<Class<? extends NameConverter>, NameConverter> nameConverterCache) { | ||
| this.session = session; | ||
| this.keyspaceId = keyspaceId; | ||
| this.tableId = tableId; | ||
| this.nameConverterCache = nameConverterCache; | ||
| } | ||
|
|
||
| public DefaultMapperContext withKeyspaceAndTable( | ||
| @Nullable CqlIdentifier newKeyspaceId, @Nullable CqlIdentifier newTableId) { | ||
| return (Objects.equals(newKeyspaceId, this.keyspaceId) | ||
| && Objects.equals(newTableId, this.tableId)) | ||
| ? this | ||
| : new DefaultMapperContext(session, newKeyspaceId, newTableId, nameConverterCache); | ||
| } | ||
|
|
||
| @NonNull | ||
| @Override | ||
| public CqlSession getSession() { | ||
| return session; | ||
| } | ||
|
|
||
| @Nullable | ||
| @Override | ||
| public CqlIdentifier getKeyspaceId() { | ||
| return keyspaceId; | ||
| } | ||
|
|
||
| @Nullable | ||
| @Override | ||
| public CqlIdentifier getTableId() { | ||
| return tableId; | ||
| } | ||
|
|
||
| @NonNull | ||
| @Override | ||
| public NameConverter getNameConverter(Class<? extends NameConverter> converterClass) { | ||
| return nameConverterCache.computeIfAbsent( | ||
| converterClass, DefaultMapperContext::buildNameConverter); | ||
| } | ||
|
|
||
| private static NameConverter buildNameConverter(Class<? extends NameConverter> converterClass) { | ||
| try { | ||
| return converterClass.getDeclaredConstructor().newInstance(); | ||
| } catch (InstantiationException | ||
| | IllegalAccessException | ||
| | NoSuchMethodException | ||
| | InvocationTargetException e) { | ||
| throw new IllegalStateException( | ||
| String.format( | ||
| "Error while building an instance of %s. " | ||
| + "%s implementations must have a public no-arg constructor", | ||
| converterClass, NameConverter.class.getSimpleName()), | ||
| e); | ||
| } | ||
| } | ||
| } |