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/* -*- Mode: c; c-basic-offset: 2 -*-
*
* rasqal_feature.c - Query system features
*
* Copyright (C) 2006, David Beckett http://purl.org/net/dajobe/
*
* This package is Free Software and part of Redland http://librdf.org/
*
* It is licensed under the following three licenses as alternatives:
* 1. GNU Lesser General Public License (LGPL) V2.1 or any newer version
* 2. GNU General Public License (GPL) V2 or any newer version
* 3. Apache License, V2.0 or any newer version
*
* You may not use this file except in compliance with at least one of
* the above three licenses.
*
* See LICENSE.html or LICENSE.txt at the top of this package for the
* complete terms and further detail along with the license texts for
* the licenses in COPYING.LIB, COPYING and LICENSE-2.0.txt respectively.
*
*
*/
#ifdef HAVE_CONFIG_H
#include <rasqal_config.h>
#endif
#ifdef WIN32
#include <win32_rasqal_config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.h>
/* Rasqal includes */
#include "rasqal.h"
#include "rasqal_internal.h"
static struct
{
rasqal_feature feature;
/* flag bits
* 1=query feature
* 2=unused
* 4=string value (else int)
*/
int flags;
const char *name;
const char *label;
} rasqal_features_list [RASQAL_FEATURE_LAST+1]= {
{ RASQAL_FEATURE_NO_NET, 1, "noNet", "Deny network requests." }
};
static const char *rasqal_feature_uri_prefix="http://feature.librdf.org/rasqal-";
/* NOTE: this is strlen(rasqal_feature_uri_prefix) */
#define RASQAL_FEATURE_URI_PREFIX_LEN 33
/*
* rasqal_features_enumerate_common:
* @feature: feature enumeration (0+)
* @name: pointer to store feature short name (or NULL)
* @uri: pointer to store feature URI (or NULL)
* @label: pointer to feature label (or NULL)
* @flags: flags to match
*
* Internal: Get list of rasqal features.
*
* If @uri is not NULL, a pointer to a new raptor_uri is returned
* that must be freed by the caller with rasqal_free_uri().
*
* Return value: 0 on success, <0 on failure, >0 if feature is unknown
**/
static int
rasqal_features_enumerate_common(const rasqal_feature feature,
const char **name,
raptor_uri **uri, const char **label,
int flags)
{
int i;
for(i=0; i <= RASQAL_FEATURE_LAST; i++)
if(rasqal_features_list[i].feature == feature &&
(rasqal_features_list[i].flags & flags)) {
if(name)
*name=rasqal_features_list[i].name;
if(uri) {
raptor_uri *base_uri=raptor_new_uri((const unsigned char*)rasqal_feature_uri_prefix);
if(!base_uri)
return -1;
*uri=raptor_new_uri_from_uri_local_name(base_uri,
(const unsigned char*)rasqal_features_list[i].name);
raptor_free_uri(base_uri);
}
if(label)
*label=rasqal_features_list[i].label;
return 0;
}
return 1;
}
/**
* rasqal_features_enumerate:
* @feature: feature enumeration (0+)
* @name: pointer to store feature short name (or NULL)
* @uri: pointer to store feature URI (or NULL)
* @label: pointer to feature label (or NULL)
*
* Get list of rasqal features.
*
* If uri is not NULL, a pointer to a new raptor_uri is returned
* that must be freed by the caller with raptor_free_uri().
*
* Return value: 0 on success, <0 on failure, >0 if feature is unknown
**/
int
rasqal_features_enumerate(const rasqal_feature feature,
const char **name,
raptor_uri **uri, const char **label)
{
return rasqal_features_enumerate_common(feature, name, uri, label, 1);
}
/**
* rasqal_feature_value_type
* @feature: rasqal query feature
*
* Get the type of a features.
*
* The type of the @feature is 0=integer , 1=string. Other values are
* undefined. Most features are integer values and use
* rasqal_query_set_feature rasqal_query_get_feature()
*
* Return value: the type of the feature or <0 if @feature is unknown
*/
int
rasqal_feature_value_type(const rasqal_feature feature) {
if(feature > RASQAL_FEATURE_LAST)
return -1;
return (rasqal_features_list[feature].flags & 4) ? 1 : 0;
}
/**
* rasqal_feature_from_uri:
* @uri: feature URI
*
* Turn a feature URI into an feature enum.
*
* The allowed feature URIs are available via rasqal_features_enumerate().
*
* Return value: < 0 if the feature is unknown
**/
rasqal_feature
rasqal_feature_from_uri(raptor_uri *uri)
{
unsigned char *uri_string;
int i;
rasqal_feature feature= (rasqal_feature)-1;
if(!uri)
return feature;
uri_string=raptor_uri_as_string(uri);
if(strncmp((const char*)uri_string, rasqal_feature_uri_prefix,
RASQAL_FEATURE_URI_PREFIX_LEN))
return feature;
uri_string += RASQAL_FEATURE_URI_PREFIX_LEN;
for(i=0; i <= RASQAL_FEATURE_LAST; i++)
if(!strcmp(rasqal_features_list[i].name, (const char*)uri_string)) {
feature=(rasqal_feature)i;
break;
}
return feature;
}
/**
* rasqal_get_feature_count:
*
* Get the count of features defined.
*
* This is prefered to the compile time-only symbol #RASQAL_FEATURE_LAST
* and returns a count of the number of features which is
* #RASQAL_FEATURE_LAST+1.
*
* Return value: count of features in the #rasqal_feature enumeration
**/
unsigned int
rasqal_get_feature_count(void) {
return RASQAL_FEATURE_LAST+1;
}
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