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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* \class document::Field
* \ingroup base
*
* \brief Specifies a field within a structured data type.
*
* A structured data type contains a key - value mapping of predefined
* data types. The field class is the key in these maps, and contains
* an identifier, in addition to datatype of values.
*/
#pragma once
#include <vespa/vespalib/stllike/string.h>
#include <vespa/document/fieldset/fieldset.h>
#include <vector>
namespace document {
class FieldValue;
class DataType;
class Field final : public FieldSet
{
vespalib::string _name;
const DataType *_dataType;
int _fieldId;
public:
using CSP = std::shared_ptr<const Field>;
using SP = std::shared_ptr<Field>;
using CPtr = const Field *;
struct FieldPtrLess {
bool operator()(CPtr f1, CPtr f2) const {
return (*f1 < *f2);
}
};
struct FieldPtrEqual {
bool operator()(CPtr f1, CPtr f2) const {
return (*f1 == *f2);
}
};
class Set {
public:
class Builder {
public:
Builder & reserve(size_t sz) { _vector.reserve(sz); return *this; }
Builder & add(CPtr field) { _vector.push_back(field); return *this; }
Set build() { return Set(std::move(_vector)); }
private:
std::vector<CPtr> _vector;
};
bool contains(const Field & field) const;
bool contains(const Set & field) const;
size_t size() const { return _fields.size(); }
bool empty() const { return _fields.empty(); }
const CPtr * begin() const { return _fields.data(); }
const CPtr * end() const { return begin() + _fields.size(); }
static Set emptySet() { return Builder().build(); }
private:
explicit Set(std::vector<CPtr> fields);
std::vector<CPtr> _fields;
};
/**
* Creates a completely specified field instance.
*
* @param name The name of the field.
* @param fieldId The numeric ID representing the field.
* @param type The datatype of the field.
* @param headerField Whether or not this is a "header" field.
*/
Field(vespalib::stringref name, int fieldId, const DataType &type);
Field();
/**
* Creates a completely specified field instance. Field ids are generated
* by hash function.
*
* @param name The name of the field.
* @param dataType The datatype of the field.
* @param headerField Whether or not this is a "header" field.
*/
Field(vespalib::stringref name, const DataType &dataType);
~Field() override;
std::unique_ptr<FieldValue> createValue() const;
// Note that only id is checked for equality.
bool operator==(const Field & other) const noexcept { return (_fieldId == other._fieldId); }
bool operator!=(const Field & other) const noexcept { return (_fieldId != other._fieldId); }
bool operator<(const Field & other) const noexcept { return (_name < other._name); }
const DataType &getDataType() const { return *_dataType; }
int getId() const noexcept { return _fieldId; }
const vespalib::string & getName() const noexcept { return _name; }
vespalib::string toString(bool verbose=false) const;
bool contains(const FieldSet& fields) const override;
Type getType() const override { return Type::FIELD; }
bool valid() const noexcept { return _fieldId != 0; }
uint32_t hash() const noexcept { return getId(); }
private:
int calculateIdV7();
void validateId(int newId);
};
} // document
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