/*=========================================================================

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#include "cmPropertyMap.h"
#include "cmSystemTools.h"
#include "cmake.h"

cmProperty *cmPropertyMap::GetOrCreateProperty(const char *name)
{
  cmPropertyMap::iterator it = this->find(name);
  cmProperty *prop;
  if (it == this->end())
    {
    prop = &(*this)[name];
    }
  else
    {
    prop = &(it->second);
    }
  return prop;
}

void cmPropertyMap::SetProperty(const char *name, const char *value,
                                cmProperty::ScopeType scope)
{
  if (!name)
    {
    return;
    }
  if(!value)
    {
    this->erase(name);
    return;
    }
#ifdef CMAKE_STRICT
  if (!this->CMakeInstance)
    {
    cmSystemTools::Error("CMakeInstance not set on a property map!"); 
    abort();
    }
  else if (!this->CMakeInstance->IsPropertyDefined(name,scope))
    {
    // is a property being queried without being defined first? If so then
    // report it as we probably need to document it
    std::string msg = "Property ";
    msg += name;
    msg += " set yet undefined on ";
    switch (scope)
      {
      case cmProperty::TARGET: 
        msg += "target.";
        break;
      case cmProperty::SOURCE_FILE:
        msg += "source file.";
        break;
      case cmProperty::DIRECTORY:
        msg += "directory.";
        break;
      case cmProperty::TEST:
        msg += "test.";
        break;
      case cmProperty::VARIABLE:
        msg += "variable.";
        break;
      case cmProperty::CACHED_VARIABLE:
        msg += "cached variable.";
        break;
      default:
        msg += "unknown.";
        break;
      }
    cmSystemTools::Error(msg.c_str()); 
    }
#else
  (void)scope;
#endif

  cmProperty *prop = this->GetOrCreateProperty(name);
  prop->Set(name,value);
}

const char *cmPropertyMap
::GetPropertyValue(const char *name, 
                   cmProperty::ScopeType scope, 
                   bool &chain) const
{ 
  chain = false;
  if (!name)
    {
    return 0;
    }

  // has the property been defined?
#ifdef CMAKE_STRICT
  if (!this->CMakeInstance)
    {
    cmSystemTools::Error("CMakeInstance not set on a property map!"); 
    abort();
    }
  else if (!this->CMakeInstance->IsPropertyDefined(name,scope))
    {
    // is a property being queried without being defined first? If so then
    // report it as we probably need to document it
    std::string msg = "Property ";
    msg += name;
    msg += " queried yet undefined on ";
    switch (scope)
      {
      case cmProperty::TARGET: 
        msg += "target.";
        break;
      case cmProperty::SOURCE_FILE:
        msg += "source file.";
        break;
      case cmProperty::DIRECTORY:
        msg += "directory.";
        break;
      case cmProperty::TEST:
        msg += "test.";
        break;
      case cmProperty::VARIABLE:
        msg += "variable.";
        break;
      case cmProperty::CACHED_VARIABLE:
        msg += "cached variable.";
        break;
      default:
        msg += "unknown.";
        break;
      }
    cmSystemTools::Error(msg.c_str()); 
    }
#endif

  cmPropertyMap::const_iterator it = this->find(name);
  if (it == this->end())
    {
    // should we chain up?
    if (this->CMakeInstance)
      {
      chain = this->CMakeInstance->IsPropertyChained(name,scope);
      }
    return 0;
    }
  return it->second.GetValue();
}

