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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/stllike/hash_set.h>
namespace search::docsummary {
class IDocsumEnvironment;
class KeywordExtractor
{
public:
class IndexPrefix
{
vespalib::string _prefix;
public:
explicit IndexPrefix(const char *prefix);
~IndexPrefix();
bool Match(const char *idxName) const;
const vespalib::string& get_prefix() const noexcept { return _prefix; }
};
private:
typedef vespalib::hash_set<vespalib::string> Set;
IDocsumEnvironment *_env;
std::vector<IndexPrefix> _legalPrefixes;
Set _legalIndexes;
bool IsLegalIndexPrefix(const char *idxName) const {
for (auto& prefix : _legalPrefixes ) {
if (prefix.Match(idxName)) {
return true;
}
}
return false;
}
void AddLegalIndexPrefix(const char *prefix) {
_legalPrefixes.emplace_back(prefix);
}
void AddLegalIndexName(const char *idxName) {
_legalIndexes.insert(idxName);
}
bool IsLegalIndexName(const char *idxName) const;
public:
explicit KeywordExtractor(IDocsumEnvironment * env);
KeywordExtractor(const KeywordExtractor &) = delete;
KeywordExtractor& operator=(const KeywordExtractor &) = delete;
~KeywordExtractor();
/**
* Parse the input string as a ';' separated list of index names and
* index name prefixes. A '*' following a token in the list denotes
* that the token is an index name prefix. Add the index names and
* index name prefixes to the set of legal values.
*
* @param spec list of legal index names and prefixes.
**/
void AddLegalIndexSpec(const char *spec);
/**
* Create a spec on the same format as accepted by the @ref
* AddLegalIndexSpec method. Freeing the returned spec is the
* responsibility of the caller of this method.
*
* @return spec defining legal index names and prefixes.
**/
vespalib::string GetLegalIndexSpec();
/**
* Determine wether the given index name is legal by checking it
* against the current set of legal index names and index name
* prefixes held by this object.
*
* @return true if the given index name is legal.
**/
bool IsLegalIndex(vespalib::stringref idx) const;
};
}
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