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72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
#pragma once
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#include <xrpl/protocol/KnownFormats.h>
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namespace xrpl {
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/** Singleton registry of field schemas for all XRPL inner object types.
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*
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* Inner objects are the structured sub-objects that appear nested inside
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* transactions and ledger entries — for example, `sfSigner`, `sfSignerEntry`,
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* `sfNFToken`, `sfAuctionSlot`, and `sfPriceData`. This registry plays the
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* same role for those nested objects as `TxFormats` plays for top-level
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* transactions: it maps each inner object's `SField` code to an `SOTemplate`
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* that declares which child fields are `soeREQUIRED`, `soeOPTIONAL`, or
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* `soeDEFAULT`.
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*
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* The key type is `int` (the integer field code returned by
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* `SField::getCode()`) rather than a dedicated enum, because inner objects
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* are already identified by their `SField` descriptors in wire format.
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*
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* The registry is complete and immutable after the first call to
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* `getInstance()`. Duplicate key registration triggers a `LogicError` at
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* static-init time. The returned `const&` from `getInstance()` is safe for
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* concurrent reads without additional locking.
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*
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* @see TxFormats, LedgerFormats, SOTemplate
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*/
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class InnerObjectFormats : public KnownFormats<int, InnerObjectFormats>
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{
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private:
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/** Register all known inner object schemas.
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*
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* Each `add()` call maps an `SField`'s JSON name and integer field code
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* to an `SOTemplate` that specifies the required, optional, and default
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* child fields. The `SField` code doubles as the registry key, so no
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* separate enumeration is needed.
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*/
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InnerObjectFormats();
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public:
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/** Return the process-wide singleton instance.
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*
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* Initialized on first call via a Meyer's function-local static; safe
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* for concurrent access after construction. The object is immutable
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* after it is returned for the first time.
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*
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* @return A `const` reference to the singleton registry.
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*/
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static InnerObjectFormats const&
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getInstance();
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/** Look up the field schema for a structured inner object.
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*
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* Translates an `SField` to its registered `SOTemplate` by matching on
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* the field's integer code. The returned pointer is stable for the
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* lifetime of the process; callers may cache it safely.
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*
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* Called by `STObject::makeInnerObject()` (amendment-gated on
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* `fixInnerObjTemplate` / `fixInnerObjTemplate2`) and by
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* `STObject::applyTemplateFromSField()` to enforce field-presence rules
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* during construction and deserialization.
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*
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* @param sField The `SField` identifying the inner object type.
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* @return A pointer to the matching `SOTemplate`, or `nullptr` if
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* `sField` is not a registered inner object type.
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*/
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[[nodiscard]] SOTemplate const*
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findSOTemplateBySField(SField const& sField) const;
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};
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} // namespace xrpl
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