spring-data-redis ConvertingCursor 源码
spring-data-redis ConvertingCursor 代码
文件路径：/src/main/java/org/springframework/data/redis/core/ConvertingCursor.java
/*
* Copyright 2014-2022 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.core;
import org.springframework.core.convert.converter.Converter;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* {@link ConvertingCursor} wraps a given cursor and applies given {@link Converter} to items prior to returning them.
* This allows to easily perform required conversion whereas the underlying implementation may still work with its
* native types.
*
* @author Christoph Strobl
* @param <S>
* @param <T>
* @since 1.4
*/
public class ConvertingCursor<S, T> implements Cursor<T> {
private final Cursor<S> delegate;
private final Converter<S, T> converter;
/**
* @param cursor Cursor must not be {@literal null}.
* @param converter Converter must not be {@literal null}.
*/
public ConvertingCursor(Cursor<S> cursor, Converter<S, T> converter) {
Assert.notNull(cursor, "Cursor delegate must not be 'null'");
Assert.notNull(cursor, "Converter must not be 'null'");
this.delegate = cursor;
this.converter = converter;
}
@Override
public boolean hasNext() {
return delegate.hasNext();
}
@Override
@Nullable
public T next() {
return converter.convert(delegate.next());
}
@Override
public void remove() {
delegate.remove();
}
@Override
public void close() {
delegate.close();
}
@Override
public long getCursorId() {
return delegate.getCursorId();
}
@Override
public boolean isClosed() {
return delegate.isClosed();
}
@Override
public long getPosition() {
return delegate.getPosition();
}
}
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