/**
* computes matrices for all actions which show whether two pattern nodes are allowed to be
* identified by the matcher
*/
protected void collectPotHomInfo() {
// tells whether two pattern nodes of a given action are pot hom or not
// e.g. : potHomMatrices[act_id][node_1][node_2]
// protected int potHomMatrices[][][];
potHomNodeMatrices = new int[n_graph_actions][max_n_pattern_nodes][max_n_pattern_nodes];
for (int i = 0; i < n_graph_actions; i++)
for (int j = 0; j < max_n_pattern_nodes; j++)
for (int k = 0; k < max_n_pattern_nodes; k++) potHomNodeMatrices[i][j][k] = 0;
// got through that m,atrices and set cells to '1' if two nodes
// are potentialy homomorphic
for (Rule action : actionRuleMap.keySet()) {
PatternGraph pattern = action.getPattern();
for (Node node_1 : pattern.getNodes()) {
Collection<Node> hom_of_node_1 = new HashSet<Node>();
hom_of_node_1 = pattern.getHomomorphic(node_1);
for (Node node_2 : pattern.getNodes()) {
// check whether these to nodes are potentially homomorphic
// the pattern graph of the currrent action
if (hom_of_node_1.contains(node_2)) {
int act_id = actionRuleMap.get(action).intValue();
int node_1_num = pattern_node_num.get(act_id).get(node_1).intValue();
int node_2_num = pattern_node_num.get(act_id).get(node_2).intValue();
potHomNodeMatrices[act_id][node_1_num][node_2_num] = 1;
}
}
}
}
}
/*
* collect some information needed for code gen process of the data
* structures representing the graph actions
*
*/
protected void collectActionInfo() {
/* get the overall number of graph actions */
n_graph_actions = actionRuleMap.keySet().size();
/* get the overall maximum numbers of nodes and edges of all pattern
and replacement graphs respectively */
max_n_pattern_nodes = 0;
max_n_pattern_edges = 0;
max_n_replacement_nodes = 0;
max_n_replacement_edges = 0;
for (Rule act : actionRuleMap.keySet()) {
// check whether its graphs node and edge set sizes are greater
int size;
size = act.getPattern().getNodes().size();
if (size > max_n_pattern_nodes) max_n_pattern_nodes = size;
size = act.getPattern().getEdges().size();
if (size > max_n_pattern_edges) max_n_pattern_edges = size;
if (act.getRight() != null) {
size = act.getRight().getNodes().size();
if (size > max_n_replacement_nodes) max_n_replacement_nodes = size;
size = act.getRight().getEdges().size();
if (size > max_n_replacement_edges) max_n_replacement_edges = size;
}
}
/* compute the numbers of nodes/edges of all pattern/replacement-graphs */
pattern_node_num = new Vector<Map<Node, Integer>>(n_graph_actions);
pattern_edge_num = new Vector<Map<Edge, Integer>>(n_graph_actions);
replacement_node_num = new Vector<Map<Node, Integer>>(n_graph_actions);
replacement_edge_num = new Vector<Map<Edge, Integer>>(n_graph_actions);
for (Rule act : actionRuleMap.keySet()) {
int act_id = actionRuleMap.get(act).intValue();
assert act_id < n_graph_actions
: "action id found which was greater than the number of graph actions";
// compute node/edge numbers
pattern_node_num.set(act_id, new HashMap<Node, Integer>());
pattern_edge_num.set(act_id, new HashMap<Edge, Integer>());
// fill the map with pairs (node, node_num)
int node_num = 0;
for (Node node : act.getPattern().getNodes()) {
pattern_node_num.get(act_id).put(node, new Integer(node_num++));
}
assert node_num == act.getPattern().getNodes().size()
: "Wrong number of node_nums was created";
// fill the map with pairs (edge, edge_num)
int edge_num = 0;
for (Edge edge : act.getPattern().getEdges()) {
pattern_edge_num.get(act_id).put(edge, new Integer(edge_num++));
}
assert edge_num == act.getPattern().getEdges().size()
: "Wrong number of edge_nums was created";
// if action has a replacement graph, compute node/edge numbers
if (act.getRight() != null) {
replacement_node_num.set(act_id, new HashMap<Node, Integer>());
replacement_edge_num.set(act_id, new HashMap<Edge, Integer>());
// fill the map with pairs (node, node_num)
node_num = 0;
for (Node node : act.getRight().getNodes()) {
replacement_node_num.get(act_id).put(node, new Integer(node_num++));
}
assert node_num == act.getRight().getNodes().size()
: "Wrong number of node_nums was created";
// fill the map with pairs (edge, edge_num)
edge_num = 0;
for (Edge edge : act.getRight().getEdges()) {
replacement_edge_num.get(act_id).put(edge, new Integer(edge_num++));
}
assert edge_num == act.getRight().getEdges().size()
: "Wrong number of edge_nums was created";
} else {
replacement_node_num.set(act_id, null);
replacement_edge_num.set(act_id, null);
}
}
/* for all actions decompose the conditions into conjunctive parts,
give all these subexpessions a number, and setup some maps keeping
information about them */
// init a subexpression counter
int subConditionCounter = 0;
// setup the array for conditions
conditions = new HashMap<Integer, Collection<Expression>>();
// iterate over all actions
for (Rule act : actionRuleMap.keySet()) {
int act_id = actionRuleMap.get(act).intValue();
conditions.put(act_id, new TreeSet<Expression>(conditionsComparator));
// iterate over all conditions of the current action
for (Expression condition : act.getPattern().getConditions()) {
// divide the expression to all AND-connected parts, which do
// not have an AND-Operator as root themselves
Collection<Expression> subConditions = decomposeAndParts(condition);
// for all the subconditions just computed...
for (Expression sub_condition : subConditions) {
// ...create condition numbers
conditionNumbers.put(sub_condition, new Integer(subConditionCounter++));
// ...extract the pattern nodes and edges involved in the condition
Collection<Node> involvedNodes = collectInvolvedNodes(sub_condition);
Collection<Edge> involvedEdges = collectInvolvedEdges(sub_condition);
// and at these Collections to prepared Maps
conditionsInvolvedNodes.put(sub_condition, involvedNodes);
conditionsInvolvedEdges.put(sub_condition, involvedEdges);
// store the subcondition in an ordered Collection
conditions.get(act_id).add(sub_condition);
}
}
}
// store the overall number of (sub)conditions
n_conditions = subConditionCounter;
/* collect the type constraints of the node of all actions pattern graphs */
int typeConditionCounter = n_conditions;
typeConditions = new Vector<Collection<Collection<InheritanceType>>>(n_graph_actions);
for (Rule act : actionRuleMap.keySet()) {
int act_id = actionRuleMap.get(act).intValue();
typeConditions.set(
act_id, new TreeSet<Collection<InheritanceType>>(typeConditionsComparator));
/* for all nodes of the current MatchingActions pattern graph
extract that nodes type constraints */
PatternGraph pattern = act.getPattern();
for (Node node : pattern.getNodes()) {
// if node has type constraints, register the as conditions
if (!node.getConstraints().isEmpty()) {
// note that a type condition is the set of all types,
// the corresponding node/edge is not allowed to be of
Collection<InheritanceType> type_condition = node.getConstraints();
// ...create condition numbers
typeConditionNumbers.put(type_condition, new Integer(typeConditionCounter++));
// ...extract the pattern nodes and edges involved in the condition
Collection<Node> involvedNodes = new HashSet<Node>();
involvedNodes.add(node);
// and at these Collections to prepared Maps
typeConditionsInvolvedNodes.put(type_condition, involvedNodes);
Collection<Edge> empty = Collections.emptySet();
typeConditionsInvolvedEdges.put(type_condition, empty);
// store the subcondition in an ordered Collection
typeConditions.get(act_id).add(type_condition);
}
}
// do the same thing for all edges of the current pattern
for (Edge edge : pattern.getEdges()) {
// if node has type constraints, register the as conditions
if (!edge.getConstraints().isEmpty()) {
// note that a type condition is the set of all types,
// the corresponding edge is not allowed to be of
Collection<InheritanceType> type_condition = edge.getConstraints();
// ...create condition numbers
typeConditionNumbers.put(type_condition, new Integer(typeConditionCounter++));
// ...extract the pattern edges and edges involved in the condition
Collection<Edge> involvedEdges = new HashSet<Edge>();
involvedEdges.add(edge);
// and at these Collections to prepared Maps
Collection<Node> empty = Collections.emptySet();
typeConditionsInvolvedNodes.put(type_condition, empty);
typeConditionsInvolvedEdges.put(type_condition, involvedEdges);
// store the subcondition in an ordered Collection
typeConditions.get(act_id).add(type_condition);
}
}
}
// update the overall number of conditions, such that type
// conditions are also included
n_conditions = typeConditionCounter;
/* for all conditions (not type conditions!) the pairs
(pattern_node_num, attr_id), which occur
in qualifications at the leaves of the condition, are needed.
To obtain that compute a map
condition_num -> pattern_node_num_ -> { attr_ids }
implemented by an Array of Maps; usage is:
involvedPatternNodeAttrIds[cond_num].get(pattern_node_num)
which yields a Collection of attr-ids.
*/
involvedPatternNodeAttrIds = new HashMap<Expression, Map<Node, Collection<Integer>>>();
involvedPatternEdgeAttrIds = new HashMap<Expression, Map<Edge, Collection<Integer>>>();
for (Rule act : actionRuleMap.keySet()) {
int act_id = actionRuleMap.get(act).intValue();
// collect the attr ids in dependency of condition and the pattern node
for (Expression cond : conditions.get(act_id)) {
// TODO use or remove it
// int cond_num = conditionNumbers.get(cond).intValue();
// descent to the conditions leaves and look for qualifications
Map<Node, Collection<Integer>> node_map = new HashMap<Node, Collection<Integer>>();
Map<Edge, Collection<Integer>> edge_map = new HashMap<Edge, Collection<Integer>>();
__recursive_qual_collect(act_id, node_map, edge_map, cond);
involvedPatternNodeAttrIds.put(cond, node_map);
involvedPatternEdgeAttrIds.put(cond, edge_map);
}
}
/* for each action compute the start node used in the matching process */
// init the array of start nodes
start_node = new Node[n_graph_actions];
// for all actions gen matcher programs
for (Rule action : actionRuleMap.keySet()) {
Graph pattern = action.getPattern();
// pick out the node with the highest priority as start node
int max_prio = 0;
// get any node as initial node
Node max_prio_node = null;
if (pattern.getNodes().iterator().hasNext()) {
max_prio_node = pattern.getNodes().iterator().next();
}
for (Node node : pattern.getNodes()) {
// get the nodes priority
int prio = 0;
Annotations a = node.getAnnotations();
if (a != null)
if (a.containsKey("prio") && a.isInteger("prio"))
prio = ((Integer) a.get("prio")).intValue();
// if the current priority is greater, update the maximum priority node
if (prio > max_prio) {
max_prio = prio;
max_prio_node = node;
}
}
start_node[actionRuleMap.get(action).intValue()] = max_prio_node;
}
// collect information about potential homomorphic pattern graph nodes,
// i.e. nodes that are allowed to be identified by the matcher during the
// matching process
collectPotHomInfo();
collectPatternNodesToBeKeptInfo();
collectReplacementNodeIsPreservedNodeInfo();
collectReplacementNodeChangesTypeToInfo();
collectNewInsertEdgesInfo();
}