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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.indices;
import org.elasticsearch.cluster.metadata.Metadata;
import java.util.List;
/**
* An IndexPatternMatcher holds an index pattern in a string and, given a
* {@link Metadata} object, can return a list of index names matching that pattern.
*/
public interface IndexPatternMatcher {
/**
* @return A pattern, either with a wildcard or simple regex, describing indices that are
* related to a system feature. Such indices may be system indices or associated
* indices.
*/
String getIndexPattern();
/**
* Retrieves a list of all indices which match this descriptor's pattern. Implementations
* may include other special information when matching indices, such as aliases.
*
* This cannot be done via {@link org.elasticsearch.cluster.metadata.IndexNameExpressionResolver} because that class can only handle
* simple wildcard expressions, but system index name patterns may use full Lucene regular expression syntax,
*
* @param metadata The current metadata to get the list of matching indices from
* @return A list of index names that match this descriptor
*/
List getMatchingIndices(Metadata metadata);
}