--- /dev/null
+/* This file is part of the YAZ toolkit.
+ * Copyright (C) 1995-2010 Index Data
+ * See the file LICENSE for details.
+ */
+/**
+ * \file zoom-query.c
+ * \brief Implements ZOOM C query interface.
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <errno.h>
+#include "zoom-p.h"
+
+#include <yaz/yaz-util.h>
+#include <yaz/xmalloc.h>
+#include <yaz/log.h>
+#include <yaz/pquery.h>
+#include <yaz/cql.h>
+#include <yaz/ccl.h>
+#include <yaz/sortspec.h>
+
+struct ZOOM_query_p {
+ Z_Query *z_query;
+ Z_SortKeySpecList *sort_spec;
+ int refcount;
+ ODR odr;
+ char *query_string;
+};
+
+Z_Query *ZOOM_query_get_Z_Query(ZOOM_query s)
+{
+ return s->z_query;
+}
+
+
+Z_SortKeySpecList *ZOOM_query_get_sortspec(ZOOM_query s)
+{
+ return s->sort_spec;
+}
+
+static void cql2pqf_wrbuf_puts(const char *buf, void *client_data)
+{
+ WRBUF wrbuf = (WRBUF) client_data;
+ wrbuf_puts(wrbuf, buf);
+}
+
+char *ZOOM_query_get_query_string(ZOOM_query s)
+{
+ return s->query_string;
+}
+
+/*
+ * Returns an xmalloc()d string containing RPN that corresponds to the
+ * CQL passed in. On error, sets the Connection object's error state
+ * and returns a null pointer.
+ * ### We could cache CQL parser and/or transformer in Connection.
+ */
+static char *cql2pqf(ZOOM_connection c, const char *cql)
+{
+ CQL_parser parser;
+ int error;
+ const char *cqlfile;
+ cql_transform_t trans;
+ char *result = 0;
+
+ parser = cql_parser_create();
+ if ((error = cql_parser_string(parser, cql)) != 0) {
+ cql_parser_destroy(parser);
+ ZOOM_set_error(c, ZOOM_ERROR_CQL_PARSE, cql);
+ return 0;
+ }
+
+ cqlfile = ZOOM_connection_option_get(c, "cqlfile");
+ if (cqlfile == 0)
+ {
+ ZOOM_set_error(c, ZOOM_ERROR_CQL_TRANSFORM, "no CQL transform file");
+ }
+ else if ((trans = cql_transform_open_fname(cqlfile)) == 0)
+ {
+ char buf[512];
+ sprintf(buf, "can't open CQL transform file '%.200s': %.200s",
+ cqlfile, strerror(errno));
+ ZOOM_set_error(c, ZOOM_ERROR_CQL_TRANSFORM, buf);
+ }
+ else
+ {
+ WRBUF wrbuf_result = wrbuf_alloc();
+ error = cql_transform(trans, cql_parser_result(parser),
+ cql2pqf_wrbuf_puts, wrbuf_result);
+ if (error != 0) {
+ char buf[512];
+ const char *addinfo;
+ error = cql_transform_error(trans, &addinfo);
+ sprintf(buf, "%.200s (addinfo=%.200s)",
+ cql_strerror(error), addinfo);
+ ZOOM_set_error(c, ZOOM_ERROR_CQL_TRANSFORM, buf);
+ }
+ else
+ {
+ result = xstrdup(wrbuf_cstr(wrbuf_result));
+ }
+ cql_transform_close(trans);
+ wrbuf_destroy(wrbuf_result);
+ }
+ cql_parser_destroy(parser);
+ return result;
+}
+
+
+ZOOM_API(ZOOM_query)
+ ZOOM_query_create(void)
+{
+ ZOOM_query s = (ZOOM_query) xmalloc(sizeof(*s));
+
+ s->refcount = 1;
+ s->z_query = 0;
+ s->sort_spec = 0;
+ s->odr = odr_createmem(ODR_ENCODE);
+ s->query_string = 0;
+
+ return s;
+}
+
+ZOOM_API(void)
+ ZOOM_query_destroy(ZOOM_query s)
+{
+ if (!s)
+ return;
+
+ (s->refcount)--;
+ if (s->refcount == 0)
+ {
+ odr_destroy(s->odr);
+ xfree(s);
+ }
+}
+
+ZOOM_API(void)
+ ZOOM_query_addref(ZOOM_query s)
+{
+ s->refcount++;
+}
+
+ZOOM_API(int)
+ ZOOM_query_prefix(ZOOM_query s, const char *str)
+{
+ s->query_string = odr_strdup(s->odr, str);
+ s->z_query = (Z_Query *) odr_malloc(s->odr, sizeof(*s->z_query));
+ s->z_query->which = Z_Query_type_1;
+ s->z_query->u.type_1 = p_query_rpn(s->odr, str);
+ if (!s->z_query->u.type_1)
+ {
+ s->z_query = 0;
+ return -1;
+ }
+ return 0;
+}
+
+ZOOM_API(int)
+ ZOOM_query_cql(ZOOM_query s, const char *str)
+{
+ Z_External *ext;
+
+ s->query_string = odr_strdup(s->odr, str);
+
+ ext = (Z_External *) odr_malloc(s->odr, sizeof(*ext));
+ ext->direct_reference = odr_oiddup(s->odr, yaz_oid_userinfo_cql);
+ ext->indirect_reference = 0;
+ ext->descriptor = 0;
+ ext->which = Z_External_CQL;
+ ext->u.cql = s->query_string;
+
+ s->z_query = (Z_Query *) odr_malloc(s->odr, sizeof(*s->z_query));
+ s->z_query->which = Z_Query_type_104;
+ s->z_query->u.type_104 = ext;
+
+ return 0;
+}
+
+/*
+ * Translate the CQL string client-side into RPN which is passed to
+ * the server. This is useful for server's that don't themselves
+ * support CQL, for which ZOOM_query_cql() is useless. `conn' is used
+ * only as a place to stash diagnostics if compilation fails; if this
+ * information is not needed, a null pointer may be used.
+ */
+ZOOM_API(int)
+ ZOOM_query_cql2rpn(ZOOM_query s, const char *str, ZOOM_connection conn)
+{
+ char *rpn;
+ int ret;
+ ZOOM_connection freeme = 0;
+
+ if (conn == 0)
+ conn = freeme = ZOOM_connection_create(0);
+
+ rpn = cql2pqf(conn, str);
+ if (freeme != 0)
+ ZOOM_connection_destroy(freeme);
+ if (rpn == 0)
+ return -1;
+
+ ret = ZOOM_query_prefix(s, rpn);
+ xfree(rpn);
+ return ret;
+}
+
+/*
+ * Analogous in every way to ZOOM_query_cql2rpn(), except that there
+ * is no analogous ZOOM_query_ccl() that just sends uninterpreted CCL
+ * to the server, as the YAZ GFS doesn't know how to handle this.
+ */
+ZOOM_API(int)
+ ZOOM_query_ccl2rpn(ZOOM_query s, const char *str, const char *config,
+ int *ccl_error, const char **error_string,
+ int *error_pos)
+{
+ int ret;
+ struct ccl_rpn_node *rpn;
+ CCL_bibset bibset = ccl_qual_mk();
+
+ if (config)
+ ccl_qual_buf(bibset, config);
+
+ rpn = ccl_find_str(bibset, str, ccl_error, error_pos);
+ if (!rpn)
+ {
+ *error_string = ccl_err_msg(*ccl_error);
+ ret = -1;
+ }
+ else
+ {
+ WRBUF wr = wrbuf_alloc();
+ ccl_pquery(wr, rpn);
+ ccl_rpn_delete(rpn);
+ ret = ZOOM_query_prefix(s, wrbuf_cstr(wr));
+ wrbuf_destroy(wr);
+ }
+ ccl_qual_rm(&bibset);
+ return ret;
+}
+
+ZOOM_API(int)
+ ZOOM_query_sortby(ZOOM_query s, const char *criteria)
+{
+ s->sort_spec = yaz_sort_spec(s->odr, criteria);
+ if (!s->sort_spec)
+ return -1;
+ return 0;
+}
+
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * c-file-style: "Stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+
projects / yaz-moved-to-github.git / blobdiff