spring security ObjectToListStringConverter 源码
spring security ObjectToListStringConverter 代码
文件路径：/oauth2/oauth2-core/src/main/java/org/springframework/security/oauth2/core/converter/ObjectToListStringConverter.java
/*
* Copyright 2002-2019 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.security.oauth2.core.converter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.converter.ConditionalGenericConverter;
import org.springframework.util.ClassUtils;
/**
* @author Joe Grandja
* @since 5.2
*/
final class ObjectToListStringConverter implements ConditionalGenericConverter {
@Override
public Set<ConvertiblePair> getConvertibleTypes() {
Set<ConvertiblePair> convertibleTypes = new LinkedHashSet<>();
convertibleTypes.add(new ConvertiblePair(Object.class, List.class));
convertibleTypes.add(new ConvertiblePair(Object.class, Collection.class));
return convertibleTypes;
}
@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
if (targetType.getElementTypeDescriptor() == null
|| targetType.getElementTypeDescriptor().getType().equals(String.class) || sourceType == null
|| ClassUtils.isAssignable(sourceType.getType(), targetType.getElementTypeDescriptor().getType())) {
return true;
}
return false;
}
@Override
public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
if (source == null) {
return null;
}
if (source instanceof Collection) {
Collection<String> results = new ArrayList<>();
for (Object object : ((Collection<?>) source)) {
if (object != null) {
results.add(object.toString());
}
}
return results;
}
return Collections.singletonList(source.toString());
}
}
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