/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.plugins;
import org.elasticsearch.cluster.metadata.IndexTemplateMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.function.UnaryOperator;
/**
* Upgrades {@link MetaData} on startup on behalf of installed {@link Plugin}s
*/
public class MetaDataUpgrader {
public final UnaryOperator<Map<String, MetaData.Custom>> customMetaDataUpgraders;
public final UnaryOperator<Map<String, IndexTemplateMetaData>> indexTemplateMetaDataUpgraders;
public MetaDataUpgrader(Collection<UnaryOperator<Map<String, MetaData.Custom>>> customMetaDataUpgraders,
Collection<UnaryOperator<Map<String, IndexTemplateMetaData>>> indexTemplateMetaDataUpgraders) {
this.customMetaDataUpgraders = customs -> {
Map<String, MetaData.Custom> upgradedCustoms = new HashMap<>(customs);
for (UnaryOperator<Map<String, MetaData.Custom>> customMetaDataUpgrader : customMetaDataUpgraders) {
upgradedCustoms = customMetaDataUpgrader.apply(upgradedCustoms);
}
return upgradedCustoms;
};
this.indexTemplateMetaDataUpgraders = templates -> {
Map<String, IndexTemplateMetaData> upgradedTemplates = new HashMap<>(templates);
for (UnaryOperator<Map<String, IndexTemplateMetaData>> upgrader : indexTemplateMetaDataUpgraders) {
upgradedTemplates = upgrader.apply(upgradedTemplates);
}
return upgradedTemplates;
};
}
}