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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
 * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.phoenix.query;

import org.apache.phoenix.schema.stats.GuidePostsInfo;
import org.apache.phoenix.schema.stats.GuidePostsKey;

/**
 * {@link PhoenixStatsLoader} implementation for the Stats Loader.
 * Empty stats loader if stats are disabled
 */
class EmptyStatsLoader implements PhoenixStatsLoader {
    @Override
    public boolean needsLoad() {
        return false;
    }

    @Override
    public GuidePostsInfo loadStats(GuidePostsKey statsKey) throws Exception {
        return GuidePostsInfo.NO_GUIDEPOST;
    }

    @Override
    public GuidePostsInfo loadStats(GuidePostsKey statsKey, GuidePostsInfo prevGuidepostInfo) throws Exception {
        return GuidePostsInfo.NO_GUIDEPOST;
    }
}