src/shared/CLucene/util/StringBuffer.h

/*------------------------------------------------------------------------------
* Copyright (C) 2003-2006 Ben van Klinken and the CLucene Team
*
* Distributable under the terms of either the Apache License (Version 2.0) or
* the GNU Lesser General Public License, as specified in the COPYING file.
------------------------------------------------------------------------------*/
#ifndef _lucene_util_StringBuffer_
#define _lucene_util_StringBuffer_

CL_NS_DEF(util)
  class CLUCENE_SHARED_EXPORT StringBuffer{
  public:
   ///Constructor. Allocates a buffer with the default length.
   StringBuffer();
   ///Constructor. Allocates a buffer of length initSize + 1
   StringBuffer(const size_t initSize);
   ///Constructor. Creates an instance of Stringbuffer containing a copy of
   ///the string value
   StringBuffer(const TCHAR* value);
   ///Constructs a StringBuffer using another buffer. The StringBuffer can
   ///the be used to easily manipulate the buffer.
   StringBuffer(TCHAR* buf,size_t maxlen, const bool consumeBuffer);
   ///Destructor
   virtual ~StringBuffer();
   ///Clears the Stringbuffer and resets it to it default empty state
   void clear();

   ///Appends a single character
   void appendChar(const TCHAR chr);
   ///Appends a copy of the string value
   void append(const TCHAR* value);
   ///Appends a copy of the string value
   void append(const TCHAR* value, size_t appendedLength);
   ///Appends an integer (after conversion to a character string) with a default radix of 10. Radixes lower than 10 not supported.
   void appendInt(const int64_t value, const int32_t _Radix = 10);
   ///Appends a float_t (after conversion to a character string)
   void appendFloat(const float_t value, const size_t digits);
   ///Appends a Lucene boost, formatted in the format used in the toString() functions; replaces JL's ToStringUtils::boost
   void appendBoost(const float_t boost);
   ///Appends a bool in the same way as java StringBuffer does (i.e. "true", "false" )
   void appendBool(const bool value);
   ///Puts a copy of the string value in front of the current string in the StringBuffer
   void prepend(const TCHAR* value);
   ///Puts a copy of the string value in front of the current string in the StringBuffer
   void prepend(const TCHAR* value, size_t prependedLength);

   StringBuffer& operator<< (const TCHAR* value)
   {
       append(value);
       return *this;
   }
   StringBuffer& operator<< (const int64_t value)
   {
       appendInt(value);
       return *this;
   }

   void setCharAt(size_t pos, const TCHAR chr);
   TCHAR charAt(size_t pos);

   void insert(const size_t pos, TCHAR chr);
   void insert(const size_t pos, const TCHAR* chrs, size_t length = -1);
   void deleteCharAt(size_t pos);
   void deleteChars(size_t start, size_t end);

   void toLower();
   bool substringEquals(size_t start, size_t end, const TCHAR* str, size_t length = -1) const;

   ///Contains the length of string in the StringBuffer
   ///Public so that analyzers can edit the length directly
   size_t len;
   ///Returns the length of the string in the StringBuffer
   size_t length() const;
   ///Returns a copy of the current string in the StringBuffer
   TCHAR* toString();
   ///Returns a null terminated reference to the StringBuffer's text
   TCHAR* getBuffer();
   /** Returns a null terminated reference to the StringBuffer's text
   * the StringBuffer's buffer is released so that the text doesn't need to be copied
   */
   TCHAR* giveBuffer();

   ///reserve a minimum amount of data for the buffer.
   ///no change made if the buffer is already longer than length
   void reserve(const size_t length);
  private:
   ///A buffer that contains strings
   TCHAR* buffer;
   ///The length of the buffer
   size_t bufferLength;
   bool bufferOwner;

   ///Has the buffer grown to a minimum length of minLength or bigger and shifts the
   ///current string in buffer by skippingNInitialChars forward
   void growBuffer(const size_t minLength, const size_t skippingNInitialChars=0);

  };
CL_NS_END
#endif