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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/memory.h>
#include <vector>
namespace document { class ByteBuffer; }
namespace vespalib { class GrowableByteBuffer; }
namespace vdslib {
class DocumentSummary {
public:
DocumentSummary();
~DocumentSummary();
/**
* Constructs a new message from a byte buffer.
*
* @param buf A byte buffer that contains a serialized message.
*/
DocumentSummary(document::ByteBuffer& buf);
size_t getSummaryCount() const { return _summary.size(); }
void getSummary(size_t hitNo, const char * & docId, const void * & buf, size_t & sz) {
docId = _summary[hitNo].getDocId(_summaryBuffer->c_str());
buf = _summary[hitNo].getSummary(_summaryBuffer->c_str(), sz);
}
void addSummary(const char * docId, const void * buf, size_t sz);
void sort();
void deserialize(document::ByteBuffer& buf);
void serialize(vespalib::GrowableByteBuffer& buf) const;
uint32_t getSerializedSize() const;
private:
class Summary {
public:
Summary() noexcept : _docIdOffset(0), _summaryOffset(0), _summaryLen(0) { }
Summary(uint32_t docIdOffset, uint32_t summaryOffset, uint32_t summaryLen) : _docIdOffset(docIdOffset), _summaryOffset(summaryOffset), _summaryLen(summaryLen) { }
const char * getDocId(const char * base) const { return base + _docIdOffset; }
const void * getSummary(const char * base, size_t & sz) const { sz = _summaryLen; return base + _summaryOffset; }
size_t getSummarySize() const { return _summaryLen; }
size_t getTotalSize() const { return _summaryOffset - _docIdOffset + _summaryLen; }
private:
uint32_t _docIdOffset;
uint32_t _summaryOffset;
uint32_t _summaryLen;
};
class Compare {
private:
const char * _buffer;
public:
Compare(const char * buffer) : _buffer(buffer) { }
bool operator() (const Summary & x, const Summary & y) const {
return strcmp(x.getDocId(_buffer), y.getDocId(_buffer)) < 0;
}
};
size_t getSummarySize() const { return _summarySize; }
using DocBuffer = std::shared_ptr<vespalib::MallocPtr>;
DocBuffer _summaryBuffer; // Raw zero-terminated documentids in rank order.
std::vector<Summary> _summary; // Constructed vector containing offset of document in buffer.
size_t _summarySize;
};
}
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