/* PSPP - a program for statistical analysis.
- Copyright (C) 1997-9, 2000, 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 1997-9, 2000, 2006, 2007, 2009 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
corresponding source index. */
};
-static void translate_case (struct ccase *, struct ccase *, void *map_);
+static struct ccase *translate_case (struct ccase *, void *map_);
static bool destroy_case_map (void *map_);
/* Creates and returns an empty map. */
}
}
-/* Maps from SRC to DST, applying case map MAP. */
-void
-case_map_execute (const struct case_map *map,
- const struct ccase *src, struct ccase *dst)
-{
- size_t dst_idx;
+/* If MAP is nonnull, returns a new case that is the result of
+ applying case map MAP to SRC, and unrefs SRC.
- case_create (dst, map->value_cnt);
- for (dst_idx = 0; dst_idx < map->value_cnt; dst_idx++)
+ If MAP is null, returns SRC unchanged. */
+struct ccase *
+case_map_execute (const struct case_map *map, struct ccase *src)
+{
+ if (map != NULL)
{
- int src_idx = map->map[dst_idx];
- if (src_idx != -1)
- *case_data_rw_idx (dst, dst_idx) = *case_data_idx (src, src_idx);
+ struct ccase *dst;
+ size_t dst_idx;
+
+ dst = case_create (map->value_cnt);
+ for (dst_idx = 0; dst_idx < map->value_cnt; dst_idx++)
+ {
+ int src_idx = map->map[dst_idx];
+ if (src_idx != -1)
+ *case_data_rw_idx (dst, dst_idx) = *case_data_idx (src, src_idx);
+ }
+ case_unref (src);
+ return dst;
}
+ else
+ return src;
}
/* Returns the number of `union value's in cases created by
}
/* Casereader/casewriter translation callback. */
-static void
-translate_case (struct ccase *input, struct ccase *output, void *map_)
+static struct ccase *
+translate_case (struct ccase *input, void *map_)
{
struct case_map *map = map_;
- case_map_execute (map, input, output);
- case_destroy (input);
+ return case_map_execute (map, input);
}
/* Casereader/casewriter destruction callback. */