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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);
}
}
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