/**
* Retrieves Strings corresponding to all valid _transition paths from a given node that satisfy a
* given condition.
*
* @param strHashSet a HashSet of Strings to contain all those in the MDAG satisfying {@code
* searchCondition} with {@code conditionString}
* @param searchCondition the SearchCondition enum field describing the type of relationship that
* Strings contained in the MDAG must have with {@code conditionString} in order to be
* included in the result set
* @param searchConditionString the String that all Strings in the MDAG must be related with in
* the fashion denoted by {@code searchCondition} in order to be included in the result set
* @param prefixString the String corresponding to the currently traversed _transition path
* @param node an int denoting the starting index of a SimpleMDAGNode's _transition set in
* mdagDataArray
*/
private void getStrings(
HashSet<String> strHashSet,
SearchCondition searchCondition,
String searchConditionString,
String prefixString,
SimpleMDAGNode node) {
int transitionSetBegin = node.getTransitionSetBeginIndex();
int onePastTransitionSetEnd = transitionSetBegin + node.getOutgoingTransitionSetSize();
// Traverse all the valid _transition paths beginning from each _transition in
// transitionTreeMap, inserting the
// corresponding Strings in to strHashSet that have the relationship with conditionString
// denoted by searchCondition
for (int i = transitionSetBegin; i < onePastTransitionSetEnd; i++) {
SimpleMDAGNode currentNode = mdagDataArray[i];
String newPrefixString = prefixString + currentNode.getLetter();
if (currentNode.isAcceptNode()
&& searchCondition.satisfiesCondition(newPrefixString, searchConditionString))
strHashSet.add(newPrefixString);
// Recursively call this to traverse all the valid _transition paths from currentNode
getStrings(strHashSet, searchCondition, searchConditionString, newPrefixString, currentNode);
}
/////
}
/**
* 递归创建节点<br>
*
* @param current 当前简易节点
* @param fromIndex 起点下标
* @param toNodeArray 终点数组
* @param fromNodeArray 起点数组，它们两个按照下标一一对应
*/
private void createMDAGNode(
SimpleMDAGNode current, int fromIndex, MDAGNode[] toNodeArray, MDAGNode[] fromNodeArray) {
MDAGNode from = (fromIndex == -1 ? sourceNode : toNodeArray[fromIndex]);
int transitionSetBegin = current.getTransitionSetBeginIndex();
int onePastTransitionSetEnd = transitionSetBegin + current.getOutgoingTransitionSetSize();
for (int i = transitionSetBegin; i < onePastTransitionSetEnd; i++) {
SimpleMDAGNode targetNode = mdagDataArray[i];
if (toNodeArray[i] != null) {
fromNodeArray[fromIndex].addOutgoingTransition(current.getLetter(), fromNodeArray[i]);
toNodeArray[fromIndex] = fromNodeArray[i];
continue;
}
toNodeArray[i] =
from.addOutgoingTransition(targetNode.getLetter(), targetNode.isAcceptNode());
fromNodeArray[i] = from;
createMDAGNode(targetNode, i, toNodeArray, fromNodeArray);
}
}