searchlib/src/vespa/searchlib/attribute/dfa_string_comparator.cpp


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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.

#include "dfa_string_comparator.h"
#include <vespa/searchlib/util/foldedstringcompare.h>

namespace search::attribute {

DfaStringComparator::DfaStringComparator(const DataStoreType& data_store, const std::vector<uint32_t>& candidate)
    : ParentType(data_store),
      _candidate(std::cref(candidate))
{
}

bool
DfaStringComparator::less(const vespalib::datastore::EntryRef lhs, const vespalib::datastore::EntryRef rhs) const
{
    if (lhs.valid()) {
        if (rhs.valid()) {
            return FoldedStringCompare::compareFolded<true, true>(get(lhs), get(rhs)) < 0;
        } else {
            return FoldedStringCompare::compareFolded<true, false>(get(lhs), _candidate) < 0;
        }
    } else {
        if (rhs.valid()) {
            return FoldedStringCompare::compareFolded<false, true>(_candidate, get(rhs)) < 0;
        } else {
            return false;
        }
    }
}

}