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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 com.yahoo.document.Field;
import com.yahoo.document.ReferenceDataType;
import com.yahoo.searchdefinition.document.SDDocumentType;
import com.yahoo.searchdefinition.document.SDField;
import java.util.List;
import java.util.Map;
import java.util.stream.Stream;
import static java.util.function.Function.identity;
import static java.util.stream.Collectors.toMap;
/**
* Resolves all document references in the search definitions
*
* Iterates through all document fields having a {@link ReferenceDataType} and uses {@link ReferenceDataType#getTargetType()}
* to determine the referenced document. This information is aggregated into a {@link DocumentReferences} object.
*
* @author bjorncs
*/
public class DocumentReferenceResolver {
private final Map<String, Search> searchMapping;
public DocumentReferenceResolver(List<Search> searchDefinitions) {
this.searchMapping = createDocumentNameToSearchMapping(searchDefinitions);
}
public void resolveReferences(SDDocumentType documentType) {
DocumentReferences references = new DocumentReferences(createFieldToDocumentReferenceMapping(documentType));
documentType.setDocumentReferences(references);
}
private Map<String, DocumentReference> createFieldToDocumentReferenceMapping(SDDocumentType documentType) {
return fieldStream(documentType)
.filter(field -> field.getDataType() instanceof ReferenceDataType)
.collect(toMap(Field::getName, this::createDocumentReference));
}
private DocumentReference createDocumentReference(Field field) {
if (!isAttribute(field)) {
throw new IllegalArgumentException(
String.format(
"The field '%s' is an invalid document reference. The field must be an attribute.",
field.getName()));
}
ReferenceDataType reference = (ReferenceDataType) field.getDataType();
String targetDocumentName = getTargetDocumentName(reference);
Search search = searchMapping.get(targetDocumentName);
if (search == null) {
throw new IllegalArgumentException(
String.format("Invalid document reference '%s': " +
"Could not find document type '%s'", field.getName(), targetDocumentName));
}
return new DocumentReference(field, search);
}
private static boolean isAttribute(Field field) {
SDField sdField = (SDField) field; // Ugly, but SDDocumentType only expose the fields as the super class Field
return sdField.doesAttributing();
}
private static Map<String, Search> createDocumentNameToSearchMapping(List<Search> searchDefintions) {
return searchDefintions.stream()
.filter(search -> search.getDocument() != null)
.collect(toMap(search -> search.getDocument().getName(), identity()));
}
private static Stream<Field> fieldStream(SDDocumentType documentType) {
return documentType.getDocumentType().getFields().stream();
}
private static String getTargetDocumentName(ReferenceDataType reference) {
return reference.getTargetType().getName();
}
}
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