org.springframework.data.redis.support.collections.CollectionUtils Maven / Gradle / Ivy
/*
* Copyright 2011-2018 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
*
* http://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.support.collections;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.SessionCallback;
/**
* Utility class used mainly for type conversion by the default collection implementations. Meant for internal use.
*
* @author Costin Leau
*/
abstract class CollectionUtils {
@SuppressWarnings("unchecked")
static Collection reverse(Collection c) {
Object[] reverse = new Object[c.size()];
int index = c.size();
for (E e : c) {
reverse[--index] = e;
}
return (List) Arrays.asList(reverse);
}
static Collection extractKeys(Collection stores) {
Collection keys = new ArrayList<>(stores.size());
for (RedisStore store : stores) {
keys.add(store.getKey());
}
return keys;
}
static void rename(final K key, final K newKey, RedisOperations operations) {
operations.execute(new SessionCallback