spring DelimitedStringToArrayConverter 源码
springboot DelimitedStringToArrayConverter 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/DelimitedStringToArrayConverter.java
/*
* Copyright 2012-2019 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.boot.convert;
import java.lang.reflect.Array;
import java.util.Collections;
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.util.Assert;
import org.springframework.util.StringUtils;
/**
* Converts a {@link Delimiter delimited} String to an Array.
*
* @author Phillip Webb
*/
final class DelimitedStringToArrayConverter implements ConditionalGenericConverter {
private final ConversionService conversionService;
DelimitedStringToArrayConverter(ConversionService conversionService) {
Assert.notNull(conversionService, "ConversionService must not be null");
this.conversionService = conversionService;
}
@Override
public Set<ConvertiblePair> getConvertibleTypes() {
return Collections.singleton(new ConvertiblePair(String.class, Object[].class));
}
@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
return targetType.getElementTypeDescriptor() == null
|| this.conversionService.canConvert(sourceType, targetType.getElementTypeDescriptor());
}
@Override
public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
if (source == null) {
return null;
}
return convert((String) source, sourceType, targetType);
}
private Object convert(String source, TypeDescriptor sourceType, TypeDescriptor targetType) {
Delimiter delimiter = targetType.getAnnotation(Delimiter.class);
String[] elements = getElements(source, (delimiter != null) ? delimiter.value() : ",");
TypeDescriptor elementDescriptor = targetType.getElementTypeDescriptor();
Object target = Array.newInstance(elementDescriptor.getType(), elements.length);
for (int i = 0; i < elements.length; i++) {
String sourceElement = elements[i];
Object targetElement = this.conversionService.convert(sourceElement.trim(), sourceType, elementDescriptor);
Array.set(target, i, targetElement);
}
return target;
}
private String[] getElements(String source, String delimiter) {
return StringUtils.delimitedListToStringArray(source, Delimiter.NONE.equals(delimiter) ? null : delimiter);
}
}
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- 本文标签： Spring Boot Java Spring
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