public boolean contains(String key) {
// ADD YOUR CODE BELOW HERE
TrieNode prefixNode = getPrefixNode(key);
return (prefixNode != null && prefixNode.getDepth() == key.length() && prefixNode.isEndOfKey());
// ADD YOUR CODE ABOVE HERE
}
public void insert(String key) {
// ADD YOUR CODE BELOW HERE
TrieNode prefixNode = getPrefixNode(key);
for (int curDepth = prefixNode.getDepth(); curDepth < key.length(); curDepth++) {
prefixNode = prefixNode.createChild(key.charAt(curDepth));
}
prefixNode.setEndOfKey(true);
// ADD YOUR ABOVE HERE
}
public ArrayList<String> getAllPrefixMatches(String prefix) {
// ADD YOUR CODE BELOW
TrieNode node = getPrefixNode(prefix);
ArrayList<String> stringList = new ArrayList<String>();
if (node.getDepth() == prefix.length()) // make sure whole prefix is matched
preOrderTraverse(node, stringList);
// ADD YOUR CODE ABOVE HERE
return stringList;
}