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115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
#pragma once
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#include "FieldBase.h"
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#include "Field.h"
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namespace ki
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{
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namespace dml
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{
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/**
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* An ordered collection of DML fields.
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*/
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class Record final : public util::Serializable
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{
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public:
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Record();
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Record(const Record &record);
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virtual ~Record();
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/**
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* Returns true if a field of any type has the name
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* specified.
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*/
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bool has_field(std::string name) const;
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/**
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* Returns true if a field exists with the specified
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* name and type.
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*/
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template <typename ValueT>
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bool has_field(std::string name) const
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{
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if (!has_field(name))
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return false;
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return m_field_map.at(name)->is_type<ValueT>();
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}
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/**
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* Returns a previously added field with the specified name
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* and type.
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*
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* If the field was not previously added, then a nullptr is
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* returned.
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*/
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template <typename ValueT>
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Field<ValueT> *get_field(std::string name) const
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{
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if (has_field<ValueT>(name))
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return dynamic_cast<Field<ValueT> *>(m_field_map.at(name));
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return nullptr;
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}
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/**
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* Adds a new field to the record with the specified name, type,
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* and transferability, and returns the newly created field.
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*
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* If a field already exists with the specified name and type,
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* then the previously added field is returned.
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*
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* If a field already exists with the specified name, but the type
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* differs, then a nullptr is returned.
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*/
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template <typename ValueT>
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Field<ValueT> *add_field(std::string name, bool transferable = true)
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{
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// Does this field already exist?
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if (has_field(name))
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{
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// Return nullptr if the type is not the same
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auto *field = m_field_map.at(name);
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if (!field->is_type<ValueT>())
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return nullptr;
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return dynamic_cast<Field<ValueT> *>(field);
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}
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// Create the field
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auto *field = new Field<ValueT>(name);
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field->m_transferable = transferable;
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add_field(field);
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return field;
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}
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size_t get_field_count() const;
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FieldList::const_iterator fields_begin() const;
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FieldList::const_iterator fields_end() const;
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void write_to(std::ostream &ostream) const override final;
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void read_from(std::istream &istream) override final;
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size_t get_size() const override final;
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/**
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* Creates an XML node from this record's data.
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*
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* The document is only used to allocate necessary resources, and
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* so the returned node has not been appended to the document.
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*/
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rapidxml::xml_node<> *as_xml(rapidxml::xml_document<> &doc) const;
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/**
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* Loads data from an XML Record node into this record.
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*
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* If a Field already exists, and the type is the same,
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* then the new value is copied into the original Field.
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* If the type is not the same, then the original Field
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* is deleted, and replaced with the new one.
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*/
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void from_xml(rapidxml::xml_node<> *node);
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private:
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FieldList m_fields;
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FieldNameMap m_field_map;
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void add_field(FieldBase *field);
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};
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}
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}
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