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package bjc.esodata;
import java.util.*;
/**
* A map that allows you to reference strings by unambiguous abbreviations to
* them.
*
* One example is that adding the string 'abc' would allow you to get it back
* with the following three keys
* <ul>
* <li>a</li>
* <li>ab</li>
* <li>abc</li>
* </ul>
*
* @author Ben Culkin
*/
public class AbbrevMap2 {
// Stores a mapping from strings, to strings that they could be abbreviations
// for
private Multimap<String, String> backing;
/**
* Create a new abbreviation map.
*/
public AbbrevMap2() {
backing = new Multimap<>();
}
/**
* Add words to the map.
*
* @param words
* The words to add to the map.
*/
public void add(String... words) {
for (String word : words) {
for (String substr : genAbbrevs(word)) backing.add(substr, word);
}
}
// Generate all of the strings a given word could be abbreviated as
private List<String> genAbbrevs(String word) {
List<String> retList = new ArrayList<>();
int len = word.length();
for (int i = 1; i <= len; i++) {
String substr = word.substring(0, i);
retList.add(substr);
}
return retList;
}
/**
* Remove words from the map.
*
* @param words
* The words to remove from the map.
*/
public void removeWords(String... words) {
for (String word : words) {
for (String substr : genAbbrevs(word)) backing.remove(substr, word);
}
}
/**
* Get all of the strings that a string could be an abbreviation for.
*
* @param word
* The word to attempt to deabbreviate.
*
* @return All of the possible deabbreviations for that word.
*/
public Set<String> deabbrevAll(String word) {
return backing.get(word);
}
/**
* Get the unambiguous thing the string is an abbreviation for.
*
* @param word
* The word to attempt to deabbreviate.
*
* @return The unambiguous deabbreviation of the string, or null if there isn't
* one.
*/
public String deabbrev(String word) {
Set<String> st = backing.get(word);
if (st.size() == 1) return st.iterator().next();
else return null;
}
}
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