org.springframework.core.convert.support.ObjectToArrayConverter Maven / Gradle / Ivy
/*
* Copyright 2002-2017 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
*
* 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.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.lang.Nullable;
import org.springframework.util.Assert;
/**
* Converts an Object to a single-element array containing the Object.
* Will convert the Object to the target array's component type if necessary.
*
* @author Keith Donald
* @author Juergen Hoeller
* @since 3.0
*/
final class ObjectToArrayConverter implements ConditionalGenericConverter {
private final ConversionService conversionService;
public ObjectToArrayConverter(ConversionService conversionService) {
this.conversionService = conversionService;
}
@Override
public Set getConvertibleTypes() {
return Collections.singleton(new ConvertiblePair(Object.class, Object[].class));
}
@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
return ConversionUtils.canConvertElements(sourceType, targetType.getElementTypeDescriptor(),
this.conversionService);
}
@Override
@Nullable
public Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
if (source == null) {
return null;
}
TypeDescriptor targetElementType = targetType.getElementTypeDescriptor();
Assert.state(targetElementType != null, "No target element type");
Object target = Array.newInstance(targetElementType.getType(), 1);
Object targetElement = this.conversionService.convert(source, sourceType, targetElementType);
Array.set(target, 0, targetElement);
return target;
}
}