Source: ../../policy/source_match_code_generator.hh
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// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
// vim:set sts=4 ts=8:
// Copyright (c) 2001-2005 International Computer Science Institute
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software")
// to deal in the Software without restriction, subject to the conditions
// listed in the XORP LICENSE file. These conditions include: you must
// preserve this copyright notice, and you cannot mention the copyright
// holders in advertising related to the Software without their permission.
// The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
// notice is a summary of the XORP LICENSE file; the license in that file is
// legally binding.
// $XORP: xorp/policy/source_match_code_generator.hh,v 1.5 2005/10/02 22:21:51 abittau Exp $
#ifndef __POLICY_SOURCE_MATCH_CODE_GENERATOR_HH__
#define __POLICY_SOURCE_MATCH_CODE_GENERATOR_HH__
#include "policy/common/policy_exception.hh"
#include "code_generator.hh"
#include <vector>
#include <string>
/**
* @short Code generator for source match filters.
*
* This is a specialized version of the import filter CodeGenerator.
*
* It skips dest and action blocks in policies.
* The action block is replaced with the actual policy tagging.
*/
class SourceMatchCodeGenerator : public CodeGenerator {
public:
// bool == tag used
// uint32_t actual tag
typedef pair<bool, uint32_t> Taginfo;
typedef vector<Taginfo> Tags;
/**
* @short Exception thrown if no protocol was specified in source block.
*/
class NoProtoSpec : public PolicyException {
public:
NoProtoSpec(const string& x) : PolicyException(x) {}
};
/**
* @short Exception thrown if protocol was re-defined in source block.
*/
class ProtoRedefined : public PolicyException {
public:
ProtoRedefined(const string& x) : PolicyException(x) {}
};
/**
* @param tagstart the first policy tag available.
* @param varmap the varmap.
*/
SourceMatchCodeGenerator(uint32_t tagstart, const VarMap& varmap);
const Element* visit_policy(PolicyStatement& policy);
const Element* visit_term(Term& term);
const Element* visit_proto(NodeProto& node);
/**
* The targets of source match code may be multiple as different protocols
* may refer to different source terms. Thus many different code fragments
* may be generated.
*
* @return seturn all the code fragments generated.
*/
vector<Code*>& codes();
/**
* The source match code generator will map source blocks to tags. If a
* source block is empty, a tag will not be used.
*
* @return information about tags used.
*/
const Tags& tags() const;
/**
* @return The next available policy tag.
*
*/
uint32_t next_tag() const;
protected:
const string& protocol();
private:
typedef map<string,Code*> CodeMap;
/**
* Adds the the code of the current term being analyzed.
*
* @param pname name of the policy statement
*/
void addTerm(const string& pname);
uint32_t _currtag;
string _protocol;
CodeMap _codes;
// FIXME: who deletes these on exception ?
vector<Code*> _codes_vect;
Tags _tags;
bool _protocol_statement;
// not impl
SourceMatchCodeGenerator(const SourceMatchCodeGenerator&);
SourceMatchCodeGenerator& operator=(const SourceMatchCodeGenerator&);
};
#endif // __POLICY_SOURCE_MATCH_CODE_GENERATOR_HH__
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