add front demo in this project

LFtid1056/cloudfront/code/log4cplus/internal/customloglevelmanager.h

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+// -*- C++ -*-
+// Module:  Log4CPLUS
+// File:    customloglevelmanager.h
+// Created: 12/2018
+// Author:  Jens Rehsack
+// Author:  Václav Haisman
+//
+//
+//  Copyright (C) 2018, Jens Rehsack. All rights reserved.
+//
+//  Redistribution and use in source and binary forms, with or without modifica-
+//  tion, are permitted provided that the following conditions are met:
+//
+//  1. Redistributions of  source code must  retain the above copyright  notice,
+//     this list of conditions and the following disclaimer.
+//
+//  2. Redistributions in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
+//  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+//  FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED.  IN NO  EVENT SHALL  THE
+//  APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
+//  INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
+//  DING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS
+//  OF USE, DATA, OR  PROFITS; OR BUSINESS  INTERRUPTION)  HOWEVER CAUSED AND ON
+//  ANY  THEORY OF LIABILITY,  WHETHER  IN CONTRACT,  STRICT LIABILITY,  OR TORT
+//  (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
+//  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/** @file
+ * This header contains declaration internal to log4cplus. They must never be
+ * visible from user accesible headers or exported in DLL/shared library.
+ */
+
+
+#ifndef LOG4CPLUS_INTERNAL_CUSTOMLOGLEVELMANAGER_HEADER_
+#define LOG4CPLUS_INTERNAL_CUSTOMLOGLEVELMANAGER_HEADER_
+
+#include <log4cplus/config.hxx>
+
+#if defined (LOG4CPLUS_HAVE_PRAGMA_ONCE)
+#pragma once
+#endif
+
+#if ! defined (INSIDE_LOG4CPLUS)
+#  error "This header must not be be used outside log4cplus' implementation files."
+#endif
+
+#include <map>
+#include <log4cplus/thread/syncprims.h>
+#include <log4cplus/internal/internal.h>
+
+
+namespace log4cplus {
+
+namespace internal {
+
+
+/**
+ * Custom log level manager used by C API.
+ */
+class CustomLogLevelManager {
+protected:
+    log4cplus::thread::Mutex mtx;
+    bool pushed_methods;
+    std::map<LogLevel,tstring> ll2nm;
+    std::map<tstring,LogLevel> nm2ll;
+
+public:
+    CustomLogLevelManager()
+        : pushed_methods (false)
+    { }
+
+    bool add(LogLevel ll, tstring const &nm)
+    {
+        log4cplus::thread::MutexGuard guard (mtx);
+
+        if (! pushed_methods)
+        {
+            pushed_methods = true;
+            getLogLevelManager().pushToStringMethod(customToStringMethod);
+            getLogLevelManager().pushFromStringMethod(customFromStringMethod);
+        }
+
+        auto i = ll2nm.lower_bound(ll);
+        if( ( i != ll2nm.end() ) && ( i->first == ll ) && ( i->second != nm ) )
+            return false;
+
+        auto j = nm2ll.lower_bound(nm);
+        if( ( j != nm2ll.end() ) && ( j->first == nm ) && ( j->second != ll ) )
+            return false;
+
+        // there is no else after return
+        ll2nm.insert( i, std::make_pair(ll, nm) );
+        nm2ll.insert( j, std::make_pair(nm, ll) );
+        return true;
+    }
+
+    bool remove(LogLevel ll, tstring const &nm)
+    {
+        log4cplus::thread::MutexGuard guard (mtx);
+
+        auto i = ll2nm.find(ll);
+        auto j = nm2ll.find(nm);
+        if( ( i != ll2nm.end() ) && ( j != nm2ll.end() ) &&
+            ( i->first == j->second ) && ( i->second == j->first ) ) {
+            ll2nm.erase(i);
+            nm2ll.erase(j);
+
+            return true;
+        }
+
+        // there is no else after return
+        return false;
+    }
+
+protected:
+    tstring const & customToStringMethodWorker(LogLevel ll)
+    {
+        log4cplus::thread::MutexGuard guard (mtx);
+        auto i = ll2nm.find(ll);
+        if( i != ll2nm.end() )
+            return i->second;
+
+        return internal::empty_str;
+    }
+
+    LogLevel customFromStringMethodWorker(const tstring& nm)
+    {
+        log4cplus::thread::MutexGuard guard (mtx);
+        auto i = nm2ll.find(nm);
+        if( i != nm2ll.end() )
+            return i->second;
+
+        return NOT_SET_LOG_LEVEL;
+    }
+
+    LOG4CPLUS_PRIVATE static tstring const & customToStringMethod(LogLevel ll);
+    LOG4CPLUS_PRIVATE static LogLevel customFromStringMethod(const tstring& nm);
+};
+
+LOG4CPLUS_PRIVATE CustomLogLevelManager & getCustomLogLevelManager ();
+
+} // namespace internal
+
+} // namespace log4cplus
+
+
+#endif // LOG4CPLUS_INTERNAL_CUSTOMLOGLEVELMANAGER_HEADER