spring ArrayToArrayConverter 源码
spring ArrayToArrayConverter 代码
文件路径：/spring-core/src/main/java/org/springframework/core/convert/support/ArrayToArrayConverter.java
/*
* Copyright 2002-2022 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
*
* https://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.core.convert.support;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.ConditionalGenericConverter;
import org.springframework.lang.Nullable;
import org.springframework.util.ObjectUtils;
/**
* Converts an array to another array. First adapts the source array to a List,
* then delegates to {@link CollectionToArrayConverter} to perform the target
* array conversion.
*
* @author Keith Donald
* @author Phillip Webb
* @since 3.0
*/
final class ArrayToArrayConverter implements ConditionalGenericConverter {
private final CollectionToArrayConverter helperConverter;
private final ConversionService conversionService;
public ArrayToArrayConverter(ConversionService conversionService) {
this.helperConverter = new CollectionToArrayConverter(conversionService);
this.conversionService = conversionService;
}
@Override
public Set<ConvertiblePair> getConvertibleTypes() {
return Collections.singleton(new ConvertiblePair(Object[].class, Object[].class));
}
@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
return this.helperConverter.matches(sourceType, targetType);
}
@Override
@Nullable
public Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
if (this.conversionService instanceof GenericConversionService genericConversionService) {
TypeDescriptor targetElement = targetType.getElementTypeDescriptor();
if (targetElement != null && genericConversionService.canBypassConvert(
sourceType.getElementTypeDescriptor(), targetElement)) {
return source;
}
}
List<Object> sourceList = Arrays.asList(ObjectUtils.toObjectArray(source));
return this.helperConverter.convert(sourceList, sourceType, targetType);
}
}
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