spring-session SingleIndexResolver 源码
spring-session SingleIndexResolver 代码
文件路径：/spring-session-core/src/main/java/org/springframework/session/SingleIndexResolver.java
/*
* Copyright 2014-2019 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.session;
import java.util.Collections;
import java.util.Map;
import org.springframework.util.Assert;
/**
* Base class for {@link IndexResolver}s that resolve a single index.
*
* @param <S> the type of Session being handled
* @author Rob Winch
* @author Vedran Pavic
* @since 2.2.0
*/
public abstract class SingleIndexResolver<S extends Session> implements IndexResolver<S> {
private final String indexName;
protected SingleIndexResolver(String indexName) {
Assert.notNull(indexName, "Index name must not be null");
this.indexName = indexName;
}
protected String getIndexName() {
return this.indexName;
}
public abstract String resolveIndexValueFor(S session);
public final Map<String, String> resolveIndexesFor(S session) {
String indexValue = resolveIndexValueFor(session);
return (indexValue != null) ? Collections.singletonMap(this.indexName, indexValue) : Collections.emptyMap();
}
}
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