org.elasticsearch.index.query.SearchIndexNameMatcher Maven / Gradle / Ivy
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/*
* 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.index.query;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.regex.Regex;
import org.elasticsearch.transport.RemoteClusterAware;
import java.util.function.Predicate;
/**
* A predicate that checks whether an index pattern matches the current search shard target.
*/
public class SearchIndexNameMatcher implements Predicate {
private final String indexName;
private final String clusterAlias;
private final ClusterService clusterService;
private final IndexNameExpressionResolver expressionResolver;
/**
* Creates a new index name matcher.
*
* @param indexName he name of the local index.
* @param clusterAlias the cluster alias of this search shard target. If it is a local target, the alias
* should be null or equal to {@link RemoteClusterAware#LOCAL_CLUSTER_GROUP_KEY}.
* @param clusterService the cluster service.
*/
public SearchIndexNameMatcher(String indexName,
String clusterAlias,
ClusterService clusterService) {
this.indexName = indexName;
this.clusterAlias = RemoteClusterAware.LOCAL_CLUSTER_GROUP_KEY.equals(clusterAlias) ? null : clusterAlias;
this.clusterService = clusterService;
this.expressionResolver = new IndexNameExpressionResolver();
}
/**
* Given an index pattern, checks whether it matches against the current shard.
*
* If this shard represents a remote shard target, then in order to match the pattern contain
* the separator ':', and must match on both the cluster alias and index name.
*/
public boolean test(String pattern) {
int separatorIndex = pattern.indexOf(RemoteClusterAware.REMOTE_CLUSTER_INDEX_SEPARATOR);
if (separatorIndex < 0) {
return clusterAlias == null && matchesIndex(pattern);
} else {
String clusterPattern = pattern.substring(0, separatorIndex);
String indexPattern = pattern.substring(separatorIndex + 1);
return Regex.simpleMatch(clusterPattern, clusterAlias) && matchesIndex(indexPattern);
}
}
private boolean matchesIndex(String pattern) {
String[] concreteIndices = expressionResolver.concreteIndexNames(
clusterService.state(), IndicesOptions.lenientExpandOpen(), pattern);
for (String index : concreteIndices) {
if (Regex.simpleMatch(index, indexName)) {
return true;
}
}
return false;
}
}