LinkedPropertyList.hpp

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/*==========================================================================
 *
 *  Original source copyright (c) 2003, Carnegie Mellon University.
 *  See copyright.cmu for details.
 *
 *==========================================================================
 */

#ifndef _LINKEDPROPERTYLIST_HPP
#define _LINKEDPROPERTYLIST_HPP

#include "PropertyList.hpp"

#include <list>

using namespace std;

namespace lemur 
{
  namespace parse 
  {
    
    typedef list<Property *> plist;

    class LinkedPropertyList : public PropertyList {

    public:
      LinkedPropertyList();
      virtual ~LinkedPropertyList();

      virtual const Property * getProperty(const string name) const; 

      virtual void startIteration() const;
      virtual const Property * nextEntry() const;
      virtual bool hasMore() const;

  
      virtual void setProperty(const Property * property);

      virtual void removeProperty(const string name);
      virtual void clear();

    protected:  

      // checks the cache for a property that 
      // can be reused, otherwise creates a new
      // property
      virtual Property * getAProperty();
      // finds the property with the given name
      virtual Property * getPropertyInternal(const string name) const;

      // need this mutable for iteration
      mutable plist::iterator iterator;
      mutable plist properties;

      plist cache;

      // We copy values into this property when returning
      // property objects.  This allows control to
      // the linked property list only.
      mutable Property returnProp;
    };
  }
}

#endif //_LINKEDPROPERTYLIST_HPP

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