98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
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#pragma once
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#include "metadata/ifc_metadata.h"
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template <class metadata_t>
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class MetadataChain : public metadata_t
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{
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public:
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MetadataChain()
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{
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parent_metadata=0;
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}
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~MetadataChain()
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{
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if (parent_metadata)
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parent_metadata->Release();
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}
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static bool Unhandled(ns_error_t ret)
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{
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return (ret == NErr_NotImplemented || ret == NErr_Empty || ret == NErr_Unknown);
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}
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ns_error_t SetParentMetadata(ifc_metadata *new_parent_metadata)
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{
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if (parent_metadata)
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parent_metadata->Release();
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parent_metadata=new_parent_metadata;
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if (parent_metadata)
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parent_metadata->Retain();
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return NErr_Success;
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}
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protected:
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ifc_metadata *parent_metadata;
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private:
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ns_error_t WASABICALL Metadata_GetField(int field, unsigned int index, nx_string_t *value)
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{
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ns_error_t ret = metadata_t::Metadata_GetField(field, index, value);
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if (Unhandled(ret) && parent_metadata)
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return parent_metadata->GetField(field, index, value);
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else
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return ret;
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}
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ns_error_t WASABICALL Metadata_GetInteger(int field, unsigned int index, int64_t *value)
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{
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ns_error_t ret = metadata_t::Metadata_GetInteger(field, index, value);
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if (Unhandled(ret) && parent_metadata)
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return parent_metadata->GetInteger(field, index, value);
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else
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return ret;
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}
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ns_error_t WASABICALL Metadata_GetReal(int field, unsigned int index, double *value)
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{
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ns_error_t ret = metadata_t::Metadata_GetReal(field, index, value);
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if (Unhandled(ret) && parent_metadata)
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return parent_metadata->GetReal(field, index, value);
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else
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return ret;
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}
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ns_error_t WASABICALL Metadata_GetArtwork(int field, unsigned int index, artwork_t *artwork, data_flags_t flags)
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{
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ns_error_t ret = metadata_t::Metadata_GetArtwork(field, index, artwork, flags);
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if (Unhandled(ret) && parent_metadata)
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return parent_metadata->GetArtwork(field, index, artwork, flags);
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else
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return ret;
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}
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ns_error_t WASABICALL Metadata_GetBinary(int field, unsigned int index, nx_data_t *data)
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{
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ns_error_t ret = metadata_t::Metadata_GetBinary(field, index, data);
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if (Unhandled(ret) && parent_metadata)
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return parent_metadata->GetBinary(field, index, data);
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else
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return ret;
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}
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ns_error_t WASABICALL Metadata_GetMetadata(int field, unsigned int index, ifc_metadata **metadata)
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{
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ns_error_t ret = metadata_t::Metadata_GetMetadata(field, index, metadata);
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if (Unhandled(ret) && parent_metadata)
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return parent_metadata->GetMetadata(field, index, metadata);
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else
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return ret;
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}
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// TODO: ns_error_t WASABICALL Metadata_Serialize(nx_data_t *data) { return NErr_NotImplemented; }
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};
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