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DATACMNS-1065 - Added support for Vavr (successor of Javaslang).

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Basically duplicated the Javaslang support to now work on Vavr types as well.
This commit is contained in:
Oliver Gierke
2017-05-11 12:36:23 +02:00
parent c59e2b8456
commit 34ce83c657
5 changed files with 301 additions and 2 deletions
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2
src/main/java/org/springframework/data/repository/util/JavaslangCollections.java
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@@ -67,7 +67,7 @@ class JavaslangCollections {
return ((javaslang.collection.Set<?>) source).toJavaSet();
}
throw new IllegalArgumentException("Unsupported Javaslang collection " + source);
throw new IllegalArgumentException("Unsupported Javaslang collection " + source.getClass());
}
}

79
src/main/java/org/springframework/data/repository/util/QueryExecutionConverters.java
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@@ -64,6 +64,7 @@ import com.google.common.base.Optional;
* <li>{@code javaslang.control.Option} - as of 1.13</li>
* <li>{@code javaslang.collection.Seq}, {@code javaslang.collection.Map}, {@code javaslang.collection.Set} - as of
* 1.13</li>
* <li>{@code io.vavr.collection.Seq}, {@code io.vavr.collection.Map}, {@code io.vavr.collection.Set} - as of 2.0</li>
* <li>Reactive wrappers supported by {@link ReactiveWrappers} - as of 2.0</li>
* </ul>
*
@@ -84,6 +85,8 @@ public abstract class QueryExecutionConverters {
QueryExecutionConverters.class.getClassLoader());
private static final boolean JAVASLANG_PRESENT = ClassUtils.isPresent("javaslang.control.Option",
QueryExecutionConverters.class.getClassLoader());
private static final boolean VAVR_PRESENT = ClassUtils.isPresent("io.vavr.control.Option",
QueryExecutionConverters.class.getClassLoader());
private static final Set<WrapperType> WRAPPER_TYPES = new HashSet<WrapperType>();
private static final Set<WrapperType> UNWRAPPER_TYPES = new HashSet<WrapperType>();
@@ -134,6 +137,16 @@ public abstract class QueryExecutionConverters {
ALLOWED_PAGEABLE_TYPES.add(Seq.class);
}
if (VAVR_PRESENT) {
WRAPPER_TYPES.add(NullableWrapperToVavrOptionConverter.getWrapperType());
WRAPPER_TYPES.add(VavrCollections.ToJavaConverter.INSTANCE.getWrapperType());
UNWRAPPERS.add(VavrOptionUnwrapper.INSTANCE);
ALLOWED_PAGEABLE_TYPES.add(io.vavr.collection.Seq.class);
}
if (ReactiveWrappers.isAvailable()) {
WRAPPER_TYPES
.addAll(ReactiveWrappers.getNoValueTypes().stream().map(WrapperType::noValue).collect(Collectors.toList()));
@@ -234,6 +247,11 @@ public abstract class QueryExecutionConverters {
conversionService.addConverter(JavaslangCollections.FromJavaConverter.INSTANCE);
}
if (VAVR_PRESENT) {
conversionService.addConverter(new NullableWrapperToVavrOptionConverter(conversionService));
conversionService.addConverter(VavrCollections.FromJavaConverter.INSTANCE);
}
conversionService.addConverter(new NullableWrapperToFutureConverter(conversionService));
}
@@ -498,6 +516,37 @@ public abstract class QueryExecutionConverters {
}
}
/**
* Converter to convert from {@link NullableWrapper} into JavaSlang's {@link io.vavr.control.Option}.
*
* @author Oliver Gierke
* @since 2.0
*/
private static class NullableWrapperToVavrOptionConverter extends AbstractWrapperTypeConverter {
/**
* Creates a new {@link NullableWrapperToJavaslangOptionConverter} using the given {@link ConversionService}.
*
* @param conversionService must not be {@literal null}.
*/
public NullableWrapperToVavrOptionConverter(ConversionService conversionService) {
super(conversionService, io.vavr.control.Option.none(), Collections.singleton(io.vavr.control.Option.class));
}
public static WrapperType getWrapperType() {
return WrapperType.singleValue(io.vavr.control.Option.class);
}
/*
* (non-Javadoc)
* @see org.springframework.data.repository.util.QueryExecutionConverters.AbstractWrapperTypeConverter#wrap(java.lang.Object)
*/
@Override
protected Object wrap(Object source) {
return io.vavr.control.Option.of(source);
}
}
/**
* A {@link Converter} to unwrap Guava {@link Optional} instances.
*
@@ -601,6 +650,36 @@ public abstract class QueryExecutionConverters {
}
}
/**
* Converter to unwrap Vavr {@link io.vavr.control.Option} instances.
*
* @author Oliver Gierke
* @since 2.0
*/
private static enum VavrOptionUnwrapper implements Converter<Object, Object> {
INSTANCE;
/*
* (non-Javadoc)
* @see org.springframework.core.convert.converter.Converter#convert(java.lang.Object)
*/
@Override
@SuppressWarnings("unchecked")
public Object convert(Object source) {
if (source instanceof io.vavr.control.Option) {
return ((io.vavr.control.Option<Object>) source).getOrElse(() -> null);
}
if (source instanceof io.vavr.collection.Traversable) {
return VavrCollections.ToJavaConverter.INSTANCE.convert(source);
}
return source;
}
}
@Value
@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
public static class WrapperType {

142
src/main/java/org/springframework/data/repository/util/VavrCollections.java Normal file
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@@ -0,0 +1,142 @@
/*
* Copyright 2016-2017 the original author or authors.
*
* 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 org.springframework.data.repository.util;
import io.vavr.collection.LinkedHashMap;
import io.vavr.collection.LinkedHashSet;
import io.vavr.collection.Traversable;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.ConditionalGenericConverter;
import org.springframework.core.convert.converter.Converter;
import org.springframework.data.repository.util.QueryExecutionConverters.WrapperType;
/**
* Converter implementations to map from and to Vavr collections.
*
* @author Oliver Gierke
* @author Christoph Strobl
* @since 2.0
*/
class VavrCollections {
public enum ToJavaConverter implements Converter<Object, Object> {
INSTANCE;
public WrapperType getWrapperType() {
return WrapperType.multiValue(io.vavr.collection.Traversable.class);
}
/*
* (non-Javadoc)
* @see org.springframework.core.convert.converter.Converter#convert(java.lang.Object)
*/
@Override
public Object convert(Object source) {
if (source instanceof io.vavr.collection.Seq) {
return ((io.vavr.collection.Seq<?>) source).toJavaList();
}
if (source instanceof io.vavr.collection.Map) {
return ((io.vavr.collection.Map<?, ?>) source).toJavaMap();
}
if (source instanceof io.vavr.collection.Set) {
return ((io.vavr.collection.Set<?>) source).toJavaSet();
}
throw new IllegalArgumentException("Unsupported Javaslang collection " + source.getClass());
}
}
public enum FromJavaConverter implements ConditionalGenericConverter {
INSTANCE {
/*
* (non-Javadoc)
* @see org.springframework.core.convert.converter.GenericConverter#getConvertibleTypes()
*/
@Override
public java.util.Set<ConvertiblePair> getConvertibleTypes() {
return CONVERTIBLE_PAIRS;
}
/*
* (non-Javadoc)
* @see org.springframework.core.convert.converter.ConditionalConverter#matches(org.springframework.core.convert.TypeDescriptor, org.springframework.core.convert.TypeDescriptor)
*/
@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
// Prevent collections to be mapped to maps
if (sourceType.isCollection() && io.vavr.collection.Map.class.isAssignableFrom(targetType.getType())) {
return false;
}
// Prevent maps to be mapped to collections
if (sourceType.isMap() && !(io.vavr.collection.Map.class.isAssignableFrom(targetType.getType())
|| targetType.getType().equals(Traversable.class))) {
return false;
}
return true;
}
/*
* (non-Javadoc)
* @see org.springframework.core.convert.converter.GenericConverter#convert(java.lang.Object, org.springframework.core.convert.TypeDescriptor, org.springframework.core.convert.TypeDescriptor)
*/
@Override
public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
if (source instanceof List) {
return io.vavr.collection.List.ofAll((Iterable<?>) source);
}
if (source instanceof java.util.Set) {
return LinkedHashSet.ofAll((Iterable<?>) source);
}
if (source instanceof java.util.Map) {
return LinkedHashMap.ofAll((java.util.Map<?, ?>) source);
}
return source;
}
};
private static final Set<ConvertiblePair> CONVERTIBLE_PAIRS;
static {
Set<ConvertiblePair> pairs = new HashSet<>();
pairs.add(new ConvertiblePair(Collection.class, io.vavr.collection.Traversable.class));
pairs.add(new ConvertiblePair(Map.class, io.vavr.collection.Traversable.class));
CONVERTIBLE_PAIRS = Collections.unmodifiableSet(pairs);
}
}
}