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diff --git a/src/main/include/log4cxx/pattern/patternconverter.h b/src/main/include/log4cxx/pattern/patternconverter.h
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+++ b/src/main/include/log4cxx/pattern/patternconverter.h
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _LOG4CXX_PATTERN_PATTERN_CONVERTER_H
+#define _LOG4CXX_PATTERN_PATTERN_CONVERTER_H
+
+
+#include <log4cxx/helpers/objectimpl.h>
+#include <log4cxx/logstring.h>
+#include <vector>
+
+#ifdef _MSC_VER
+//   disable identifier too wide for debugging warning
+#pragma warning ( disable: 4231 4251 4275 4786 )
+#endif
+
+#define DECLARE_LOG4CXX_PATTERN(cls) DECLARE_ABSTRACT_LOG4CXX_OBJECT(cls)
+
+namespace log4cxx {
+  namespace pattern {
+
+  typedef std::vector<LogString> OptionsList;
+
+/**
+
+   <p>PatternConverter is an abstract class that provides the
+   formatting functionality that derived classes need.
+
+   <p>Conversion specifiers in a conversion patterns are parsed to
+   individual PatternConverters. Each of which is responsible for
+   converting an object in a converter specific manner.
+   
+ */
+class LOG4CXX_EXPORT PatternConverter : public virtual log4cxx::helpers::ObjectImpl {
+
+  /**
+   * Converter name.
+   */
+  const LogString name;
+
+  /**
+   * Converter style name.
+   */
+  const LogString style;
+
+
+protected:
+  /**
+   * Create a new pattern converter.
+   * @param name name for pattern converter.
+   * @param style CSS style for formatted output.
+   */
+  PatternConverter(const LogString& name,
+         const LogString& style);
+
+  virtual ~PatternConverter();
+
+public:
+  DECLARE_LOG4CXX_PATTERN(PatternConverter)
+  BEGIN_LOG4CXX_CAST_MAP()
+          LOG4CXX_CAST_ENTRY(PatternConverter)
+  END_LOG4CXX_CAST_MAP()
+
+  /**
+   * Formats an object into a string buffer.
+   * @param obj event to format, may not be null.
+   * @param toAppendTo string buffer to which the formatted event will be appended.  May not be null.
+   * @param p pool for any allocations necessary during formatting.
+   */
+  virtual void format(const log4cxx::helpers::ObjectPtr& obj,
+      LogString& toAppendTo,
+      log4cxx::helpers::Pool& p) const = 0;
+
+  /**
+   * This method returns the name of the conversion pattern.
+   *
+   * The name can be useful to certain Layouts such as HTMLLayout.
+   *
+   * @return        the name of the conversion pattern
+   */
+  LogString getName() const;
+
+  /**
+   * This method returns the CSS style class that should be applied to
+   * the LoggingEvent passed as parameter, which can be null.
+   *
+   * This information is currently used only by HTMLLayout.
+   *
+   * @param e null values are accepted
+   * @return  the name of the conversion pattern
+   */
+  virtual LogString getStyleClass(const log4cxx::helpers::ObjectPtr& e) const;
+
+protected:
+/**
+* Appends content in the locale code page to a LogString.
+* @param toAppendTo string to which content is appended.
+* @param src content.
+*/
+  static void append(LogString& toAppendTo, const std::string& src);
+};
+
+
+LOG4CXX_PTR_DEF(PatternConverter);
+
+  }
+}
+
+
+#endif