org.springframework.boot.convert.CharSequenceToObjectConverter Maven / Gradle / Ivy
/*
* Copyright 2012-2021 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.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;
/**
* {@link ConditionalGenericConverter} to convert {@link CharSequence} type by delegating
* to existing {@link String} converters.
*
* @author Phillip Webb
*/
class CharSequenceToObjectConverter implements ConditionalGenericConverter {
private static final TypeDescriptor STRING = TypeDescriptor.valueOf(String.class);
private static final TypeDescriptor BYTE_ARRAY = TypeDescriptor.valueOf(byte[].class);
private static final Set TYPES;
private final ThreadLocal disable = new ThreadLocal<>();
static {
TYPES = Collections.singleton(new ConvertiblePair(CharSequence.class, Object.class));
}
private final ConversionService conversionService;
CharSequenceToObjectConverter(ConversionService conversionService) {
this.conversionService = conversionService;
}
@Override
public Set getConvertibleTypes() {
return TYPES;
}
@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
if (sourceType.getType() == String.class || this.disable.get() == Boolean.TRUE) {
return false;
}
this.disable.set(Boolean.TRUE);
try {
boolean canDirectlyConvertCharSequence = this.conversionService.canConvert(sourceType, targetType);
if (canDirectlyConvertCharSequence && !isStringConversionBetter(sourceType, targetType)) {
return false;
}
return this.conversionService.canConvert(STRING, targetType);
}
finally {
this.disable.set(null);
}
}
/**
* Return if String based conversion is better based on the target type. This is
* required when ObjectTo... conversion produces incorrect results.
* @param sourceType the source type to test
* @param targetType the target type to test
* @return if string conversion is better
*/
private boolean isStringConversionBetter(TypeDescriptor sourceType, TypeDescriptor targetType) {
if (this.conversionService instanceof ApplicationConversionService) {
ApplicationConversionService applicationConversionService = (ApplicationConversionService) this.conversionService;
if (applicationConversionService.isConvertViaObjectSourceType(sourceType, targetType)) {
// If an ObjectTo... converter is being used then there might be a better
// StringTo... version
return true;
}
}
if ((targetType.isArray() || targetType.isCollection()) && !targetType.equals(BYTE_ARRAY)) {
// StringToArrayConverter / StringToCollectionConverter are better than
// ObjectToArrayConverter / ObjectToCollectionConverter
return true;
}
return false;
}
@Override
public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
return this.conversionService.convert(source.toString(), STRING, targetType);
}
}