container-search/src/main/java/com/yahoo/search/federation/sourceref/SourceRefResolver.java


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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.search.federation.sourceref;

import static com.yahoo.container.util.Util.quote;

import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import com.yahoo.component.ComponentSpecification;
import com.yahoo.prelude.IndexFacts;
import com.yahoo.processing.request.Properties;

/**
 * Maps a source reference to search chain invocation specs.
 *
 * @author tonytv
 */
public class SourceRefResolver {
    private final SearchChainResolver searchChainResolver;

    public SourceRefResolver(SearchChainResolver searchChainResolver) {
        this.searchChainResolver = searchChainResolver;
    }
    public Set<SearchChainInvocationSpec> resolve(ComponentSpecification sourceRef, Properties sourceToProviderMap,
            IndexFacts indexFacts)
            throws UnresolvedSearchChainException {

        try {
            return new LinkedHashSet<>(Arrays.asList(searchChainResolver.resolve(sourceRef, sourceToProviderMap)));
        } catch (UnresolvedSourceRefException e) {
            return resolveClustersWithDocument(sourceRef, sourceToProviderMap, indexFacts);
        }
    }

    private Set<SearchChainInvocationSpec> resolveClustersWithDocument(ComponentSpecification sourceRef,
                                                                       Properties sourceToProviderMap,
                                                                       IndexFacts indexFacts)
            throws UnresolvedSearchChainException {

        if (hasOnlyName(sourceRef)) {
            Set<SearchChainInvocationSpec> clusterSearchChains = new LinkedHashSet<>();

            List<String> clusters = indexFacts.clustersHavingSearchDefinition(sourceRef.getName());
            for (String cluster : clusters) {
                clusterSearchChains.add(resolveClusterSearchChain(cluster, sourceRef, sourceToProviderMap));
            }

            if (!clusterSearchChains.isEmpty())
                return clusterSearchChains;
        }

        throw UnresolvedSourceRefException.createForMissingSourceRef(sourceRef);

    }

    private SearchChainInvocationSpec resolveClusterSearchChain(String cluster, ComponentSpecification sourceRef,
                                                                Properties sourceToProviderMap) throws UnresolvedSearchChainException {
        try {
            return searchChainResolver.resolve(new ComponentSpecification(cluster), sourceToProviderMap);
        } catch (UnresolvedSearchChainException e) {
            throw new UnresolvedSearchChainException("Failed to resolve cluster search chain " + quote(cluster) +
                    " when using source ref " + quote(sourceRef) + " as a document name.");
        }
    }

    private boolean hasOnlyName(ComponentSpecification sourceSpec) {
        return new ComponentSpecification(sourceSpec.getName()).equals(sourceSpec);
    }
}