ChangeLogTag: Thu Jan 17 17:04:25 2002 Balachandran Natarajan <bala@cs.wustl.edu>

1 files changed, 100 insertions, 0 deletions

diff --git a/TAO/tao/Policy_Validator.h b/TAO/tao/Policy_Validator.h
new file mode 100644
index 00000000000..9582e4fb9d7
--- /dev/null
+++ b/TAO/tao/Policy_Validator.h
@@ -0,0 +1,100 @@
+//=============================================================================
+/**
+ *  @file    Policy_Validator.h
+ *
+ *  $Id$
+ *
+ *  This file contains the declaration for the POA policy validator
+ *  interface.
+ *
+ *  @author  Angelo Corsaro <corsaro@cs.wustl.edu>
+ *  @author  Frank Hunleth  <fhuntleth@cs.wustl.edu>
+ */
+//=============================================================================
+
+#ifndef TAO_POLICY_VALIDATOR_H
+#define TAO_POLICY_VALIDATOR_H
+#include "ace/pre.h"
+#include "tao/corbafwd.h"
+
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+
+// Forward declarations.
+class TAO_Policy_Set;
+class TAO_ORB_Core;
+
+/**
+ * @class TAO_Policy_Validator
+ *
+ * @brief An abstract class for plugging in different Policy Validator
+ *  mechanisms.
+ *
+ *  This class was moved form the PortableServer library. The Portable
+ *  Serever library used this abstraction to add policy validators to
+ *  for the policies in the POA. This class seems so much useful for
+ *  passing policy information between different loaded libraries.
+ */
+
+class TAO_Export TAO_Policy_Validator
+{
+public:
+  /// Constructor.
+  TAO_Policy_Validator (TAO_ORB_Core &orb_core);
+
+  /// Destructor.
+  virtual ~TAO_Policy_Validator (void);
+
+  /**
+   * Validate that the policies in the specified set
+   * are consistent and legal.  Throw an appropriate exception
+   * if that is not the case.
+   */
+  void validate (TAO_Policy_Set &policies
+                 TAO_ENV_ARG_DECL);
+
+  /**
+   * Add/merge policies.
+   **/
+  void merge_policies (TAO_Policy_Set &policies
+                       TAO_ENV_ARG_DECL);
+
+  /**
+   * Return whether the specified policy type is legal for the
+   * current configuration.  This is needed since the user can
+   * potentially specify policies that are unknown to an
+   * validate () routine, and these need to be caught.
+   */
+  CORBA::Boolean legal_policy (CORBA::PolicyType type);
+
+  /**
+   * Adds a validator to the "chain of validators". The <code>
+   * TAO_POA_Policy_Validator </code> implements something that looks
+   * like a chain of responsability in which different member of the
+   * chain have the responsability of validating a given set of
+   * policies.
+   */
+  void add_validator (TAO_Policy_Validator *validator);
+
+
+protected:
+  virtual void validate_impl (TAO_Policy_Set &policies
+                              TAO_ENV_ARG_DECL) = 0;
+
+  virtual void merge_policies_impl (TAO_Policy_Set &policies
+                                    TAO_ENV_ARG_DECL) = 0;
+
+  virtual CORBA::Boolean legal_policy_impl (CORBA::PolicyType type) = 0;
+
+  TAO_ORB_Core &orb_core_;
+
+private:
+  TAO_Policy_Validator *next_;
+  static TAO_Policy_Validator *last_;
+};
+
+#include "ace/post.h"
+#endif /* TAO_POLICY_VALIDATOR_H_ */