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73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
#include "FileDictionarySource.h"
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#include <DataStreams/OwningBlockInputStream.h>
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#include <IO/ReadBufferFromFile.h>
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#include <Interpreters/Context.h>
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#include <Poco/File.h>
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#include "DictionarySourceFactory.h"
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#include "DictionaryStructure.h"
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namespace DB
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{
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static const size_t max_block_size = 8192;
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FileDictionarySource::FileDictionarySource(
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const std::string & filename, const std::string & format, Block & sample_block, const Context & context)
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: filename{filename}, format{format}, sample_block{sample_block}, context(context)
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{
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}
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FileDictionarySource::FileDictionarySource(const FileDictionarySource & other)
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: filename{other.filename}
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, format{other.format}
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, sample_block{other.sample_block}
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, context(other.context)
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, last_modification{other.last_modification}
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{
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}
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BlockInputStreamPtr FileDictionarySource::loadAll()
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{
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auto in_ptr = std::make_unique<ReadBufferFromFile>(filename);
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auto stream = context.getInputFormat(format, *in_ptr, sample_block, max_block_size);
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last_modification = getLastModification();
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return std::make_shared<OwningBlockInputStream<ReadBuffer>>(stream, std::move(in_ptr));
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}
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std::string FileDictionarySource::toString() const
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{
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return "File: " + filename + ' ' + format;
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}
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Poco::Timestamp FileDictionarySource::getLastModification() const
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{
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return Poco::File{filename}.getLastModified();
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}
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void registerDictionarySourceFile(DictionarySourceFactory & factory)
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{
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auto createTableSource = [=](const DictionaryStructure & dict_struct,
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const Poco::Util::AbstractConfiguration & config,
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const std::string & config_prefix,
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Block & sample_block,
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const Context & context) -> DictionarySourcePtr {
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if (dict_struct.has_expressions)
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throw Exception{"Dictionary source of type `file` does not support attribute expressions", ErrorCodes::LOGICAL_ERROR};
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const auto filename = config.getString(config_prefix + ".file.path");
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const auto format = config.getString(config_prefix + ".file.format");
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return std::make_unique<FileDictionarySource>(filename, format, sample_block, context);
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};
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factory.registerSource("file", createTableSource);
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}
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}
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