mirror of
https://github.com/XRPLF/rippled.git
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115 lines
3.0 KiB
C++
115 lines
3.0 KiB
C++
#include <xrpl/ledger/BookDirs.h>
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#include <xrpl/beast/utility/Zero.h>
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#include <xrpl/beast/utility/instrumentation.h>
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#include <xrpl/ledger/ReadView.h>
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#include <xrpl/ledger/helpers/DirectoryHelpers.h>
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#include <xrpl/protocol/Book.h>
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#include <xrpl/protocol/Indexes.h>
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#include <optional>
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namespace xrpl {
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BookDirs::BookDirs(ReadView const& view, Book const& book)
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: view_(&view)
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, root_(keylet::page(getBookBase(book)).key)
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, nextQuality_(getQualityNext(root_))
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, key_(view_->succ(root_, nextQuality_).value_or(beast::kZero))
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{
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XRPL_ASSERT(root_ != beast::kZero, "xrpl::BookDirs::BookDirs : nonzero root");
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if (key_ != beast::kZero)
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{
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if (!cdirFirst(*view_, key_, sle_, entry_, index_))
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{
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// LCOV_EXCL_START
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UNREACHABLE("xrpl::BookDirs::BookDirs : directory is empty");
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// LCOV_EXCL_STOP
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}
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}
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}
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auto
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BookDirs::begin() const -> BookDirs::const_iterator
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{
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auto it = BookDirs::const_iterator(*view_, root_, key_);
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if (key_ != beast::kZero)
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{
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it.nextQuality_ = nextQuality_;
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it.sle_ = sle_;
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it.entry_ = entry_;
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it.index_ = index_;
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}
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return it;
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}
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auto
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BookDirs::end() const -> BookDirs::const_iterator
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{
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return BookDirs::const_iterator(*view_, root_, key_);
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}
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bool
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BookDirs::const_iterator::operator==(BookDirs::const_iterator const& other) const
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{
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if (view_ == nullptr || other.view_ == nullptr)
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return false;
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XRPL_ASSERT(
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view_ == other.view_ && root_ == other.root_,
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"xrpl::BookDirs::const_iterator::operator== : views and roots are "
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"matching");
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return entry_ == other.entry_ && curKey_ == other.curKey_ && index_ == other.index_;
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}
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BookDirs::const_iterator::reference
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BookDirs::const_iterator::operator*() const
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{
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XRPL_ASSERT(
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index_ != beast::kZero, "xrpl::BookDirs::const_iterator::operator* : nonzero index");
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if (!cache_)
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cache_ = view_->read(keylet::offer(index_));
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return *cache_;
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}
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BookDirs::const_iterator&
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BookDirs::const_iterator::operator++()
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{
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using beast::kZero;
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XRPL_ASSERT(index_ != kZero, "xrpl::BookDirs::const_iterator::operator++ : nonzero index");
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if (!cdirNext(*view_, curKey_, sle_, entry_, index_))
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{
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if (index_ == 0)
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curKey_ = view_->succ(++curKey_, nextQuality_).value_or(kZero);
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if (index_ != 0 || curKey_ == kZero)
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{
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curKey_ = key_;
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entry_ = 0;
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index_ = kZero;
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}
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else if (!cdirFirst(*view_, curKey_, sle_, entry_, index_))
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{
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// LCOV_EXCL_START
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UNREACHABLE("xrpl::BookDirs::const_iterator::operator++ : directory is empty");
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// LCOV_EXCL_STOP
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}
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}
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cache_ = std::nullopt;
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return *this;
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}
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BookDirs::const_iterator
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BookDirs::const_iterator::operator++(int)
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{
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XRPL_ASSERT(
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index_ != beast::kZero, "xrpl::BookDirs::const_iterator::operator++(int) : nonzero index");
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const_iterator tmp(*this);
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++(*this);
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return tmp;
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}
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} // namespace xrpl
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