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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
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package org.elasticsearch.index.aliases;

import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.cluster.metadata.AliasMetaData;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.collect.ImmutableOpenMap;
import org.elasticsearch.common.compress.CompressedXContent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.AbstractIndexComponent;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.query.IndexQueryParserService;
import org.elasticsearch.index.query.ParsedQuery;
import org.elasticsearch.index.settings.IndexSettingsService;
import org.elasticsearch.indices.AliasFilterParsingException;
import org.elasticsearch.indices.InvalidAliasNameException;

import java.io.IOException;

public class IndexAliasesService extends AbstractIndexComponent {

    private final IndexQueryParserService indexQueryParser;
    private volatile ImmutableOpenMap aliases = ImmutableOpenMap.of();

    @Inject
    public IndexAliasesService(Index index, IndexSettingsService indexSettingsService, IndexQueryParserService indexQueryParser) {
        super(index, indexSettingsService.getSettings());
        this.indexQueryParser = indexQueryParser;
    }

    /**
     * Returns the filter associated with listed filtering aliases.
     * 

* The list of filtering aliases should be obtained by calling MetaData.filteringAliases. * Returns null if no filtering is required.

*/ public Query aliasFilter(String... aliasNames) { if (aliasNames == null || aliasNames.length == 0) { return null; } if (aliasNames.length == 1) { AliasMetaData alias = this.aliases.get(aliasNames[0]); if (alias == null) { // This shouldn't happen unless alias disappeared after filteringAliases was called. throw new InvalidAliasNameException(index, aliasNames[0], "Unknown alias name was passed to alias Filter"); } return parse(alias); } else { // we need to bench here a bit, to see maybe it makes sense to use OrFilter BooleanQuery.Builder combined = new BooleanQuery.Builder(); for (String aliasName : aliasNames) { AliasMetaData alias = this.aliases.get(aliasName); if (alias == null) { // This shouldn't happen unless alias disappeared after filteringAliases was called. throw new InvalidAliasNameException(index, aliasNames[0], "Unknown alias name was passed to alias Filter"); } Query parsedFilter = parse(alias); if (parsedFilter != null) { combined.add(parsedFilter, BooleanClause.Occur.SHOULD); } else { // The filter might be null only if filter was removed after filteringAliases was called return null; } } return combined.build(); } } public void setAliases(ImmutableOpenMap aliases) { this.aliases = aliases; } Query parse(AliasMetaData alias) { if (alias.filter() == null) { return null; } try { byte[] filterSource = alias.filter().uncompressed(); try (XContentParser parser = XContentFactory.xContent(filterSource).createParser(filterSource)) { ParsedQuery parsedFilter = indexQueryParser.parseInnerFilter(parser); return parsedFilter == null ? null : parsedFilter.query(); } } catch (IOException ex) { throw new AliasFilterParsingException(index, alias.getAlias(), "Invalid alias filter", ex); } } // Used by tests: void add(String alias, @Nullable CompressedXContent filter) { AliasMetaData aliasMetaData = AliasMetaData.builder(alias).filter(filter).build(); aliases = ImmutableOpenMap.builder(aliases).fPut(alias, aliasMetaData).build(); } boolean hasAlias(String alias) { return aliases.containsKey(alias); } void remove(String alias) { aliases = ImmutableOpenMap.builder(aliases).fRemove(alias).build(); } }




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