text: /*
     Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; version 2 of the License.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
  */
  
  #ifndef NDB_ROPE_HPP
  #define NDB_ROPE_HPP
  
  #include "DataBuffer.hpp"
  
  typedef DataBuffer<7> RopeBase;
  typedef DataBuffer<7>::DataBufferPool RopePool;
  
  struct RopeHandle {
    RopeHandle() { m_hash = 0; }
  
    Uint32 m_hash;
    RopeBase::Head m_head; 
  
    Uint32 hashValue() const { return m_hash; }
  };
  
  class ConstRope : private RopeBase {
  public:
    ConstRope(RopePool& thePool, const RopeHandle& handle)  
      : RopeBase(thePool), src(handle)
    {
      this->head = src.m_head;
    }
    
    ~ConstRope(){
    }
  
    Uint32 size() const;
    bool empty() const;
  
    void copy(char* buf) const;
    
    int compare(const char * s) const { return compare(s, (Uint32)strlen(s) + 1);}
    int compare(const char *, Uint32 len) const; 
  
    bool equal(const ConstRope& r2) const;
  private:
    const RopeHandle & src;
  };
  
  class Rope : private RopeBase {
  public:
    Rope(RopePool& thePool, RopeHandle& handle)  
      : RopeBase(thePool), src(handle)
    {
      this->head = src.m_head;
      m_hash = src.m_hash;
    }
    
    ~Rope(){
      src.m_head = this->head;
      src.m_hash = m_hash;
    }
  
    Uint32 size() const;
    bool empty() const;
  
    void copy(char* buf) const;
    
    int compare(const char * s) const { return compare(s, Uint32(strlen(s) + 1));}
    int compare(const char *, Uint32 len) const; 
    
    bool assign(const char * s) { return assign(s, Uint32(strlen(s) + 1));}
    bool assign(const char * s, Uint32 l) { return assign(s, l, hash(s, l));}
    bool assign(const char *, Uint32 len, Uint32 hash);
  
    void erase();
    
    static Uint32 hash(const char * str, Uint32 len);
  
    static Uint32 getSegmentSize() { return RopeBase::getSegmentSize();}
  private:
    Uint32 m_hash;
    RopeHandle & src;
  };
  
  inline
  Uint32
  Rope::size() const {
    return head.used;
  }
  
  inline
  bool
  Rope::empty() const {
    return head.used == 0;
  }
  
  inline
  Uint32
  ConstRope::size() const {
    return head.used;
  }
  
  inline
  bool
  ConstRope::empty() const {
    return head.used == 0;
  }
  
  #endif
  
  