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Implement faster edge branching

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This commit is contained in:
c9s 2015-11-17 16:08:01 +08:00
parent 2f3bcb7116
commit f795785dce
1 changed files with 16 additions and 33 deletions
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47
src/edge.c
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@ -40,56 +40,39 @@ edge * r3_edge_createl(const char * pattern, int pattern_len, node * child) {
/**
* r3_edge_branch splits the edge and append the rest part as the child of the
* first level child
*
* branch the edge pattern at "dl" offset,
* insert a dummy child between the edges.
* and insert a dummy child between the edges.
*
*
* A -> [prefix..suffix] -> B
* A -> [prefix] -> B -> [suffix] -> New Child (Copy Data, Edges from B)
* A -> [EDGE: abcdefg] -> B -> [EDGE:branch1], [EDGE:branch2]
* A -> [EDGE: abcd] -> B1 -> [efg] -> B2 (new child with copied data from B)
*
*/
node * r3_edge_branch(edge *e, int dl) {
node * new_child;
edge *e1;
edge * new_edge;
// the rest string
char * s1 = e->pattern + dl;
int s1_len = 0;
int s1_len = e->pattern_len - dl;
// the suffix edge of the leaf
new_child = r3_tree_create(3);
s1_len = e->pattern_len - dl;
e1 = r3_edge_createl(zstrndup(s1, s1_len), s1_len, new_child);
new_edge = r3_edge_createl(zstrndup(s1, s1_len), s1_len, new_child);
// Migrate the child edges to the new edge we just created.
for ( int i = 0 ; i < e->child->edge_len ; i++ ) {
r3_node_append_edge(new_child, e->child->edges[i]);
e->child->edges[i] = NULL;
}
e->child->edge_len = 0;
// Move child node to the new edge
new_edge->child = e->child;
e->child = new_child;
// Migrate the child routes
for ( int i = 0 ; i < e->child->route_len ; i++ ) {
r3_node_append_route(new_child, e->child->routes[i]);
e->child->routes[i] = NULL;
}
e->child->route_len = 0;
// Migrate the endpoint
new_child->endpoint = e->child->endpoint;
e->child->endpoint = 0; // reset endpoint
// Migrate the data
new_child->data = e->child->data; // copy data pointer
e->child->data = NULL;
r3_node_append_edge(e->child, e1);
r3_node_append_edge(new_child, new_edge);
// truncate the original edge pattern
char *oldpattern = e->pattern;
e->pattern = zstrndup(e->pattern, dl);
e->pattern_len = dl;
zfree(oldpattern);
return new_child;
}