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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchdefinition;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
/**
* Mapping from name to {@link RankProfile} as well as a reverse mapping of {@link RankProfile} to {@link Search}.
* Having both of these mappings consolidated here make it easier to remove dependencies on these mappings at
* run time, since it is essentially only used when building rank profile config at deployment time.
*
* Global rank profiles are represented by the Search key null.
*
* @author Ulf Lilleengen
*/
public class RankProfileRegistry {
private final Map<RankProfile, Search> rankProfileToSearch = new LinkedHashMap<>();
private final Map<Search, Map<String, RankProfile>> rankProfiles = new LinkedHashMap<>();
/* These rank profiles can be overridden: 'default' rank profile, as that is documented to work. And 'unranked'. */
static final Set<String> overridableRankProfileNames = new HashSet<>(Arrays.asList("default", "unranked"));
public static RankProfileRegistry createRankProfileRegistryWithBuiltinRankProfiles(Search search) {
RankProfileRegistry rankProfileRegistry = new RankProfileRegistry();
rankProfileRegistry.add(new DefaultRankProfile(search, rankProfileRegistry));
rankProfileRegistry.add(new UnrankedRankProfile(search, rankProfileRegistry));
return rankProfileRegistry;
}
/**
* Adds a rank profile to this registry
*
* @param rankProfile the rank profile to add
*/
public void add(RankProfile rankProfile) {
if ( ! rankProfiles.containsKey(rankProfile.getSearch())) {
rankProfiles.put(rankProfile.getSearch(), new LinkedHashMap<>());
}
checkForDuplicate(rankProfile);
rankProfiles.get(rankProfile.getSearch()).put(rankProfile.getName(), rankProfile);
rankProfileToSearch.put(rankProfile, rankProfile.getSearch());
}
private void checkForDuplicate(RankProfile rankProfile) {
String rankProfileName = rankProfile.getName();
RankProfile existingRangProfileWithSameName = rankProfiles.get(rankProfile.getSearch()).get(rankProfileName);
if (existingRangProfileWithSameName == null) return;
if ( ! overridableRankProfileNames.contains(rankProfileName)) {
throw new IllegalArgumentException("Cannot add rank profile '" + rankProfileName + "' in search definition '"
+ rankProfile.getSearch().getName() + "', since it already exists");
}
}
/**
* Returns a named rank profile, null if the search definition doesn't have one with the given name
*
* @param search the {@link Search} that owns the rank profile.
* @param name the name of the rank profile
* @return the RankProfile to return.
*/
public RankProfile get(Search search, String name) {
Map<String, RankProfile> profiles = rankProfiles.get(search);
if (profiles == null) return null;
return profiles.get(name);
}
/**
* Rank profiles that are collected across clusters.
* @return A set of global {@link RankProfile} instances.
*/
public Set<RankProfile> all() {
return rankProfileToSearch.keySet();
}
/**
* Returns the rank profiles of a given search definition.
*
* @param search {@link Search} to get rank profiles for
* @return a collection of {@link RankProfile} instances
*/
public Collection<RankProfile> rankProfilesOf(Search search) {
Map<String, RankProfile> mapping = rankProfiles.get(search);
if (mapping == null) {
return Collections.emptyList();
}
return mapping.values();
}
}
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