X-Git-Url: http://sru.miketaylor.org.uk/?a=blobdiff_plain;f=src%2Ffilter_query_rewrite.cpp;h=fa507072bbd93084003d87290eba4338788bac4d;hb=1e61b0aa05e2351e33d909f7503eaf936a2d9bb0;hp=cffa7e386e2f24879ccf3d422ae3b73895fdc90f;hpb=743341841a21a695d08c99b27a30329119030db5;p=metaproxy-moved-to-github.git diff --git a/src/filter_query_rewrite.cpp b/src/filter_query_rewrite.cpp index cffa7e3..fa50707 100644 --- a/src/filter_query_rewrite.cpp +++ b/src/filter_query_rewrite.cpp @@ -1,7 +1,7 @@ -/* $Id: filter_query_rewrite.cpp,v 1.2 2006-01-20 22:38:12 marc Exp $ - Copyright (c) 2005, Index Data. +/* $Id: filter_query_rewrite.cpp,v 1.8 2006-06-10 14:29:12 adam Exp $ + Copyright (c) 2005-2006, Index Data. -%LICENSE% + See the LICENSE file for details */ @@ -9,28 +9,44 @@ #include "filter.hpp" #include "package.hpp" -//#include -#include - #include "util.hpp" #include "filter_query_rewrite.hpp" #include +#include +#include + +#include +#include -namespace yf = yp2::filter; +namespace mp = metaproxy_1; +namespace yf = mp::filter; -namespace yp2 { +namespace metaproxy_1 { namespace filter { class QueryRewrite::Rep { - //friend class QueryRewrite; public: - void process(yp2::Package &package) const; + Rep(); + ~Rep(); + void process(mp::Package &package) const; + void configure(const xmlNode * ptr); private: - void rewriteRegex(Z_Query *query) const; + xsltStylesheetPtr m_stylesheet; }; } } +yf::QueryRewrite::Rep::Rep() +{ + m_stylesheet = 0; +} + +yf::QueryRewrite::Rep::~Rep() +{ + if (m_stylesheet) + xsltFreeStylesheet(m_stylesheet); +} + yf::QueryRewrite::QueryRewrite() : m_p(new Rep) { } @@ -39,130 +55,119 @@ yf::QueryRewrite::~QueryRewrite() { // must have a destructor because of boost::scoped_ptr } -void yf::QueryRewrite::process(yp2::Package &package) const +void yf::QueryRewrite::process(mp::Package &package) const { m_p->process(package); } -void yf::QueryRewrite::Rep::process(yp2::Package &package) const +void mp::filter::QueryRewrite::configure(const xmlNode *ptr) +{ + m_p->configure(ptr); +} + +void yf::QueryRewrite::Rep::process(mp::Package &package) const { - if (package.session().is_closed()) - { - std::cout << "Got Close.\n"; - } - Z_GDU *gdu = package.request().get(); - if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which == - Z_APDU_initRequest) + if (gdu && gdu->which == Z_GDU_Z3950) { - std::cout << "Got Z3950 Init PDU\n"; - //Z_InitRequest *req = gdu->u.z3950->u.initRequest; - //package.request() = gdu; - } - else if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which == - Z_APDU_searchRequest) - { - std::cout << "Got Z3950 Search PDU\n"; - Z_SearchRequest *req = gdu->u.z3950->u.searchRequest; - - // applying regex query rewriting - rewriteRegex(req->query); + Z_APDU *apdu_req = gdu->u.z3950; + if (apdu_req->which == Z_APDU_searchRequest) + { + int error_code = 0; + const char *addinfo = 0; + mp::odr odr; + Z_SearchRequest *req = apdu_req->u.searchRequest; - // fold new query structure into gdu package .. - // yp2::util::pqf(odr, gdu->u.z3950, query_out); - // question: which odr structure to use in this call ?? - // memory alignment has to be correct, this is a little tricky ... - // I'd rather like to alter the gdu and pack it back using: - package.request() = gdu; - } - else if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which == - Z_APDU_scanRequest) - { - std::cout << "Got Z3950 Scan PDU\n"; - //Z_ScanRequest *req = gdu->u.z3950->u.scanRequest; - //package.request() = gdu; - } + xmlDocPtr doc_input = 0; + yaz_query2xml(req->query, &doc_input); + + if (!doc_input) + { + error_code = YAZ_BIB1_MALFORMED_QUERY; + addinfo = "converion from Query to XML failed"; + } + else + { + if (m_stylesheet) + { + xmlDocPtr doc_res = xsltApplyStylesheet(m_stylesheet, + doc_input, 0); + if (!doc_res) + { + error_code = YAZ_BIB1_MALFORMED_QUERY; + addinfo = "XSLT transform failed for query"; + } + else + { + const xmlNode *root_element = xmlDocGetRootElement(doc_res); + yaz_xml2query(root_element, &req->query, odr, + &error_code, &addinfo); + xmlFreeDoc(doc_res); + } + } + xmlFreeDoc(doc_input); + } + package.request() = gdu; + if (error_code) + { + Z_APDU *f_apdu = + odr.create_searchResponse(apdu_req, error_code, addinfo); + package.response() = f_apdu; + return; + } + } + } package.move(); } - -void yf::QueryRewrite::Rep::rewriteRegex(Z_Query *query) const +void mp::filter::QueryRewrite::Rep::configure(const xmlNode *ptr) { - std::string query_in = yp2::util::zQueryToString(query); - std::cout << "QUERY IN '" << query_in << "'\n"; - - std::string query_out; - - boost::regex rgx; - try{ - // make regular expression replacement here - std::string expression("@attr 1=4"); - std::string format("@attr 1=4 @attr 4=3"); - //std::string expression("the"); - //std::string format("else"); - //std::string expression("(<)|(>)|\\r"); - //std::string format("(?1<)(?2>)"); - - std::cout << "EXPRESSION '" << expression << "'\n"; - std::cout << "FORMAT '" << format << "'\n"; - - rgx.assign(expression.c_str()); - - bool match(false); - bool search(false); - - // other flags - // see http://www.boost.org/libs/regex/doc/match_flag_type.html - //boost::match_flag_type flags = boost::match_default; - // boost::format_default - // boost::format_perl - // boost::format_literal - // boost::format_all - // boost::format_no_copy - // boost::format_first_only - - boost::match_flag_type flags - = boost::match_default | boost::format_all; - - match = regex_match(query_in, rgx, flags); - search = regex_search(query_in, rgx, flags); - query_out = boost::regex_replace(query_in, rgx, format, flags); - std::cout << "MATCH '" << match << "'\n"; - std::cout << "SEARCH '" << search << "'\n"; - std::cout << "QUERY OUT '" << query_out << "'\n"; - - } - catch(boost::regex_error &e) + for (ptr = ptr->children; ptr; ptr = ptr->next) { - std::cout << "REGEX Error code=" << e.code() - << " position=" << e.position() << "\n"; + if (ptr->type != XML_ELEMENT_NODE) + continue; + if (!strcmp((const char *) ptr->name, "xslt")) + { + if (m_stylesheet) + { + throw mp::filter::FilterException + ("Only one xslt element allowed in query_rewrite filter"); + } + + std::string fname = mp::xml::get_text(ptr); + m_stylesheet = xsltParseStylesheetFile(BAD_CAST fname.c_str()); + if (!m_stylesheet) + { + throw mp::filter::FilterException + ("Failed to read stylesheet " + + fname + + " in query_rewrite filter"); + } + } + else + { + throw mp::filter::FilterException + ("Bad element " + + std::string((const char *) ptr->name) + + " in query_rewrite filter"); + } } - - //std::cout << "QUERY OUT '" << query_out << "'\n"; - // still need to fold this new rpn query string into Z_Query structure... } - - -static yp2::filter::Base* filter_creator() +static mp::filter::Base* filter_creator() { - return new yp2::filter::QueryRewrite; + return new mp::filter::QueryRewrite; } extern "C" { - struct yp2_filter_struct yp2_filter_query_rewrite = { + struct metaproxy_1_filter_struct metaproxy_1_filter_query_rewrite = { 0, - "query-rewrite", + "query_rewrite", filter_creator }; } -extern "C" { - extern struct yp2_filter_struct yp2_filter_query_rewrite; -} - - /* * Local variables: * c-basic-offset: 4