![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
index 5e57185ee4d8a9639cb072e1aac261c90e2fbb07..ab12162115b6d9d56d7011ae225871c488fc322f 100644 (file)
--- a/src/include/core/store.h
+++ b/src/include/core/store.h
/*
* sdb_store_expr_attrvalue:
* Creates an expression which evaluates to the value of the specified
- * attribute of a stored object.
+ * attribute of a stored object. Evaluates to a NULL value if the attribute
+ * does not exist.
*
* Returns:
* - an expression object on success
sdb_store_expr_eval(sdb_store_expr_t *expr, sdb_store_obj_t *obj,
sdb_data_t *res, sdb_store_matcher_t *filter);
-/*
- * Conditionals may be used to lookup hosts from the store based on a
- * conditional expression.
- *
- * A conditional object inherits from sdb_object_t and, thus, may safely be
- * cast to a generic object.
- */
-struct sdb_store_cond;
-typedef struct sdb_store_cond sdb_store_cond_t;
-#define SDB_STORE_COND(obj) ((sdb_store_cond_t *)(obj))
-
-/*
- * sdb_store_attr_cond:
- * Creates a conditional based on attribute values. The value of stored
- * attributes is compared against the value the expression evaluates to. See
- * sdb_data_cmp for details about the comparison.
- */
-sdb_store_cond_t *
-sdb_store_attr_cond(const char *name, sdb_store_expr_t *expr);
-
-/*
- * sdb_store_obj_cond:
- * Creates a conditional based on queryable object fields. The respective
- * field of *any* object type is compared against the value the expression
- * evaluates to.
- */
-sdb_store_cond_t *
-sdb_store_obj_cond(int field, sdb_store_expr_t *expr);
-
/*
* sdb_store_name_matcher:
* Creates a matcher matching by the specified object type's name. If 're' is
sdb_store_name_matcher(int type, const char *name, _Bool re);
/*
- * sdb_store_attr_matcher:
- * Creates a matcher matching attributes based on their value. If 're' is
- * true, the specified name is treated as a POSIX extended regular expression.
- * Else, the exact name has to match (case-insensitive).
+ * sdb_store_isnull_matcher:
+ * Creates a matcher matching NULL values.
*/
sdb_store_matcher_t *
-sdb_store_attr_matcher(const char *name, const char *value, _Bool re);
+sdb_store_isnull_matcher(sdb_store_expr_t *expr);
/*
- * sdb_store_isnull_matcher:
- * Creates a matcher matching "missing" attributes.
+ * sdb_store_isnnull_matcher:
+ * Creates a matcher matching non-NULL values.
*/
sdb_store_matcher_t *
-sdb_store_isnull_matcher(const char *attr_name);
+sdb_store_isnnull_matcher(sdb_store_expr_t *expr);
/*
* sdb_store_child_matcher:
/*
* sdb_store_lt_matcher, sdb_store_le_matcher, sdb_store_eq_matcher,
* sdb_store_ge_matcher, sdb_store_gt_matcher:
- * Creates a matcher based on a conditional. The matcher matches objects for
- * which the conditional evaluates the object to compare less than, less or
- * equal, equal, greater or equal, or greater than the conditional's value
- * repsectively.
+ * Create conditional matchers comparing the values of two expressions. The
+ * matcher matches if the left expression compres less than, less or equal
+ * than, equal to, not equal to, greater or equal than, or greater than the
+ * right expression.
*/
sdb_store_matcher_t *
-sdb_store_lt_matcher(sdb_store_cond_t *cond);
-sdb_store_matcher_t *
-sdb_store_le_matcher(sdb_store_cond_t *cond);
+sdb_store_lt_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_eq_matcher(sdb_store_cond_t *cond);
+sdb_store_le_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_ge_matcher(sdb_store_cond_t *cond);
+sdb_store_eq_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_gt_matcher(sdb_store_cond_t *cond);
-
+sdb_store_ne_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_cmp_lt(sdb_store_expr_t *left, sdb_store_expr_t *right);
+sdb_store_ge_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
sdb_store_matcher_t *
-sdb_store_cmp_le(sdb_store_expr_t *left, sdb_store_expr_t *right);
-sdb_store_matcher_t *
-sdb_store_cmp_eq(sdb_store_expr_t *left, sdb_store_expr_t *right);
-sdb_store_matcher_t *
-sdb_store_cmp_ne(sdb_store_expr_t *left, sdb_store_expr_t *right);
-sdb_store_matcher_t *
-sdb_store_cmp_ge(sdb_store_expr_t *left, sdb_store_expr_t *right);
+sdb_store_gt_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
+
+/*
+ * sdb_store_in_matcher:
+ * Creates a matcher which matches if the right value evaluates to an array
+ * value and the left value is included in that array. See sdb_data_inarray
+ * for more details.
+ */
sdb_store_matcher_t *
-sdb_store_cmp_gt(sdb_store_expr_t *left, sdb_store_expr_t *right);
+sdb_store_in_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
/*
* sdb_store_regex_matcher:
sdb_store_matcher_t *
sdb_store_nregex_matcher(sdb_store_expr_t *left, sdb_store_expr_t *right);
+/*
+ * sdb_store_matcher_op_cb:
+ * Callback constructing a matcher operator.
+ */
+typedef sdb_store_matcher_t *(*sdb_store_matcher_op_cb)
+ (sdb_store_expr_t *, sdb_store_expr_t *);
+
+/*
+ * sdb_store_parse_matcher_op:
+ * Parse a matcher operator and return a constructor for the respective
+ * matcher.
+ *
+ * Returns:
+ * - matcher operator constructor on success
+ * - NULL else
+ */
+sdb_store_matcher_op_cb
+sdb_store_parse_matcher_op(const char *op);
+
/*
* sdb_store_parse_object_type_plural:
* Parse the type name (plural) of a stored object.
/*
* sdb_store_matcher_parse_cmp:
- * Parse a simple compare expression (<obj_type>.<attr> <op> <expression>).
+ * Parse a simple compare expression (<obj_type> <op> <expression>).
*
* Returns:
* - a matcher object on success
* - NULL else
*/
sdb_store_matcher_t *
-sdb_store_matcher_parse_cmp(const char *obj_type, const char *attr,
+sdb_store_matcher_parse_cmp(const char *obj_type,
const char *op, sdb_store_expr_t *expr);
-/*
- * sdb_store_matcher_parse_field_cmp:
- * Parse a simple compare expression for queryable object fields (<field> <op>
- * <expression>).
- *
- * Returns:
- * - a matcher object on success
- * - NULL else
- */
-sdb_store_matcher_t *
-sdb_store_matcher_parse_field_cmp(const char *name, const char *op,
- sdb_store_expr_t *expr);
-
/*
* sdb_store_dis_matcher:
* Creates a matcher matching the disjunction (logical OR) of two matchers.
sdb_store_matcher_matches(sdb_store_matcher_t *m, sdb_store_obj_t *obj,
sdb_store_matcher_t *filter);
-/*
- * sdb_store_matcher_tostring:
- * Format a matcher object as string. This is meant for logging or debugging
- * purposes.
- */
-char *
-sdb_store_matcher_tostring(sdb_store_matcher_t *m, char *buf, size_t buflen);
-
/*
* sdb_store_lookup_cb:
* Lookup callback. It is called for each matching object when looking up data