spring-data-redis DecoratingStringHashMapper 源码
spring-data-redis DecoratingStringHashMapper 代码
文件路径：/src/main/java/org/springframework/data/redis/hash/DecoratingStringHashMapper.java
/*
* Copyright 2011-2022 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.data.redis.hash;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Delegating hash mapper used for flattening objects into Strings. Suitable when dealing with mappers that support
* Strings and type conversion.
*
* @author Costin Leau
*/
public class DecoratingStringHashMapper<T> implements HashMapper<T, String, String> {
private final HashMapper<T, ?, ?> delegate;
public DecoratingStringHashMapper(HashMapper<T, ?, ?> mapper) {
this.delegate = mapper;
}
@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public T fromHash(Map hash) {
return (T) delegate.fromHash(hash);
}
@Override
public Map<String, String> toHash(T object) {
Map<?, ?> hash = delegate.toHash(object);
Map<String, String> flatten = new LinkedHashMap<>(hash.size());
for (Map.Entry<?, ?> entry : hash.entrySet()) {
flatten.put(String.valueOf(entry.getKey()), String.valueOf(entry.getValue()));
}
return flatten;
}
}
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