/*
* Copyright 2002-2016 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.core.convert.support;
import org.springframework.core.convert.ConversionFailedException;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.GenericConverter;
import org.springframework.util.Assert;
/**
* Internal utilities for the conversion package.
*
* @author Keith Donald
* @author Stephane Nicoll
* @since 3.0
*/
abstract class ConversionUtils {
public static Object invokeConverter(GenericConverter converter, Object source, TypeDescriptor sourceType,
TypeDescriptor targetType) {
try {
return converter.convert(source, sourceType, targetType);
}
catch (ConversionFailedException ex) {
throw ex;
}
catch (Throwable ex) {
throw new ConversionFailedException(sourceType, targetType, source, ex);
}
}
public static boolean canConvertElements(TypeDescriptor sourceElementType, TypeDescriptor targetElementType,
ConversionService conversionService) {
if (targetElementType == null) {
// yes
return true;
}
if (sourceElementType == null) {
// maybe
return true;
}
if (conversionService.canConvert(sourceElementType, targetElementType)) {
// yes
return true;
}
else if (sourceElementType.getType().isAssignableFrom(targetElementType.getType())) {
// maybe
return true;
}
else {
// no
return false;
}
}
public static Class<?> getEnumType(Class<?> targetType) {
Class<?> enumType = targetType;
while (enumType != null && !enumType.isEnum()) {
enumType = enumType.getSuperclass();
}
Assert.notNull(enumType, () -> "The target type " + targetType.getName() + " does not refer to an enum");
return enumType;
}
}