00001 // -*- C++ -*- 00002 00003 //============================================================================= 00004 /** 00005 * @file Policy_Validator.h 00006 * 00007 * Policy_Validator.h,v 1.9 2005/11/02 11:03:26 ossama Exp 00008 * 00009 * This file contains the declaration for the POA policy validator 00010 * interface. 00011 * 00012 * @author Angelo Corsaro <corsaro@cs.wustl.edu> 00013 * @author Frank Hunleth <fhuntleth@cs.wustl.edu> 00014 */ 00015 //============================================================================= 00016 00017 #ifndef TAO_POLICY_VALIDATOR_H 00018 #define TAO_POLICY_VALIDATOR_H 00019 00020 #include /**/ "ace/pre.h" 00021 #include "ace/CORBA_macros.h" 00022 00023 #if !defined (ACE_LACKS_PRAGMA_ONCE) 00024 # pragma once 00025 #endif /* ACE_LACKS_PRAGMA_ONCE */ 00026 00027 #include "tao/TAO_Export.h" 00028 #include "tao/Basic_Types.h" 00029 00030 TAO_BEGIN_VERSIONED_NAMESPACE_DECL 00031 00032 // Forward declarations. 00033 class TAO_Policy_Set; 00034 class TAO_ORB_Core; 00035 00036 namespace CORBA 00037 { 00038 typedef ULong PolicyType; 00039 00040 class Environment; 00041 } 00042 00043 /** 00044 * @class TAO_Policy_Validator 00045 * 00046 * @brief An abstract class for plugging in different Policy Validator 00047 * mechanisms. 00048 * 00049 * This class was moved from the PortableServer library. The Portable 00050 * Serever library used this abstraction to add policy validators to 00051 * for the policies in the POA. This class seems so much useful for 00052 * passing policy information between different loaded libraries. 00053 */ 00054 00055 class TAO_Export TAO_Policy_Validator 00056 { 00057 public: 00058 /// Constructor. 00059 TAO_Policy_Validator (TAO_ORB_Core &orb_core); 00060 00061 /// Destructor. 00062 virtual ~TAO_Policy_Validator (void); 00063 00064 /** 00065 * Validate that the policies in the specified set 00066 * are consistent and legal. Throw an appropriate exception 00067 * if that is not the case. 00068 */ 00069 void validate (TAO_Policy_Set &policies 00070 ACE_ENV_ARG_DECL); 00071 00072 /** 00073 * Add/merge policies. 00074 **/ 00075 void merge_policies (TAO_Policy_Set &policies 00076 ACE_ENV_ARG_DECL); 00077 00078 /** 00079 * Return whether the specified policy type is legal for the 00080 * current configuration. This is needed since the user can 00081 * potentially specify policies that are unknown to an 00082 * validate () routine, and these need to be caught. 00083 */ 00084 CORBA::Boolean legal_policy (CORBA::PolicyType type); 00085 00086 /** 00087 * Adds a validator to the "chain of validators". The <code> 00088 * TAO_POA_Policy_Validator </code> implements something that looks 00089 * like a chain of responsability in which different member of the 00090 * chain have the responsability of validating a given set of 00091 * policies. 00092 */ 00093 void add_validator (TAO_Policy_Validator *validator); 00094 00095 00096 /** 00097 * Accessor for the stored ORB core reference 00098 */ 00099 TAO_ORB_Core & orb_core() const; 00100 00101 protected: 00102 virtual void validate_impl (TAO_Policy_Set &policies 00103 ACE_ENV_ARG_DECL) = 0; 00104 00105 virtual void merge_policies_impl (TAO_Policy_Set &policies 00106 ACE_ENV_ARG_DECL) = 0; 00107 00108 virtual CORBA::Boolean legal_policy_impl (CORBA::PolicyType type) = 0; 00109 00110 TAO_ORB_Core &orb_core_; 00111 00112 private: 00113 TAO_Policy_Validator *next_; 00114 }; 00115 00116 TAO_END_VERSIONED_NAMESPACE_DECL 00117 00118 #include /**/ "ace/post.h" 00119 00120 #endif /* TAO_POLICY_VALIDATOR_H */