Clean up and restructure sources

src/ripple/app/book/impl/BookTip.cpp

@@ -0,0 +1,79 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2014 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <ripple/app/book/BookTip.h>
+
+namespace ripple {
+namespace core {
+
+BookTip::BookTip (LedgerView& view, BookRef book)
+    : m_view (view)
+    , m_valid (false)
+    , m_book (Ledger::getBookBase (book))
+    , m_end (Ledger::getQualityNext (m_book))
+{
+}
+
+bool
+BookTip::step ()
+{
+    if (m_valid)
+    {
+        if (m_entry)
+        {
+            view().offerDelete (m_index);
+            m_entry = nullptr;
+        }
+    }
+
+    for(;;)
+    {
+        // See if there's an entry at or worse than current quality.
+        auto const page (
+            view().getNextLedgerIndex (m_book, m_end));
+
+        if (page.isZero())
+            return false;
+
+        unsigned int di (0);
+        SLE::pointer dir;
+        if (view().dirFirst (page, dir, di, m_index))
+        {
+            m_dir = dir->getIndex();
+            m_entry = view().entryCache (ltOFFER, m_index);
+            m_valid = true;
+
+            // Next query should start before this directory
+            m_book = page;
+
+            // The quality immediately before the next quality
+            --m_book;
+
+            break;
+        }
+        // There should never be an empty directory but just in case,
+        // we handle that case by advancing to the next directory.
+        m_book = page;
+    }
+
+    return true;
+}
+
+}
+}