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package bjc.utils.esodata;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.SetMultimap;
import bjc.utils.funcdata.FunctionalMap;
import bjc.utils.funcdata.IMap;
/**
* Represents a mapping from a set of strings to a mapping of all unambiguous
* prefixes of their respective strings.
*
* This works the same as Ruby's Abbrev.
*
* @author EVE
*
*/
public class AbbrevMap {
/*
* All of the words we have abbreviations for.
*/
private final Set<String> wrds;
/*
* Maps abbreviations to their strings.
*/
private IMap<String, String> abbrevMap;
/*
* Counts how many times we've seen a substring.
*/
private Set<String> seen;
/*
* Maps ambiguous abbreviations to the strings they could be.
*/
private SetMultimap<String, String> ambMap;
/**
* Create a new abbreviation map.
*
* @param words
* The initial set of words to put in the map.
*/
public AbbrevMap(final String... words) {
wrds = new HashSet<>(Arrays.asList(words));
recalculate();
}
/**
* Recalculate all the abbreviations in this map.
*/
public void recalculate() {
abbrevMap = new FunctionalMap<>();
ambMap = HashMultimap.create();
seen = new HashSet<>();
for (final String word : wrds) {
/*
* A word always abbreviates to itself.
*/
abbrevMap.put(word, word);
intAddWord(word);
}
}
/**
* Adds words to the abbreviation map.
*
* @param words
* The words to add to the abbreviation map.
*/
public void addWords(final String... words) {
wrds.addAll(Arrays.asList(words));
for (final String word : words) {
/*
* A word always abbreviates to itself.
*/
abbrevMap.put(word, word);
intAddWord(word);
}
}
/*
* Actually add abbreviations of a word.
*/
private void intAddWord(final String word) {
/*
* Skip blank words.
*/
if (word.equals("")) return;
/*
* Handle each possible abbreviation.
*/
for (int i = word.length(); i > 0; i--) {
final String subword = word.substring(0, i);
if (seen.contains(subword)) {
/*
* Remove a mapping if its ambiguous and not a
* whole word.
*/
if (abbrevMap.containsKey(subword) && !wrds.contains(subword)) {
final String oldword = abbrevMap.remove(subword);
ambMap.put(subword, oldword);
ambMap.put(subword, word);
} else if (!wrds.contains(subword)) {
ambMap.put(subword, word);
}
} else {
seen.add(subword);
abbrevMap.put(subword, word);
}
}
}
/**
* Removes words from the abbreviation map.
*
* NOTE: There may be inconsistent behavior. Use
* {@link AbbrevMap#recalculate()} to fix it if it occurs.
*
* @param words
* The words to remove.
*/
public void removeWords(final String... words) {
wrds.removeAll(Arrays.asList(words));
for (final String word : words) {
intRemoveWord(word);
}
}
/*
* Actually remove a word.
*/
private void intRemoveWord(final String word) {
/*
* Skip blank words.
*/
if (word.equals("")) return;
/*
* Handle each possible abbreviation.
*/
for (int i = word.length(); i > 0; i--) {
final String subword = word.substring(0, i);
if (abbrevMap.containsKey(subword)) {
abbrevMap.remove(subword);
} else {
ambMap.remove(subword, word);
final Set<String> possWords = ambMap.get(subword);
if (possWords.size() == 0) {
seen.remove(subword);
} else if (possWords.size() == 1) {
final String newWord = possWords.iterator().next();
abbrevMap.put(subword, newWord);
ambMap.remove(subword, newWord);
}
}
}
}
/**
* Convert an abbreviation into all the strings it could abbreviate
* into.
*
* @param abbrev
* The abbreviation to convert.
*
* @return All the expansions for the provided abbreviation.
*/
public String[] deabbrev(final String abbrev) {
if (abbrevMap.containsKey(abbrev))
return new String[] { abbrevMap.get(abbrev) };
else return ambMap.get(abbrev).toArray(new String[0]);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (wrds == null ? 0 : wrds.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (!(obj instanceof AbbrevMap)) return false;
final AbbrevMap other = (AbbrevMap) obj;
if (wrds == null) {
if (other.wrds != null) return false;
} else if (!wrds.equals(other.wrds)) return false;
return true;
}
@Override
public String toString() {
final String fmt = "AbbrevMap [wrds=%s, abbrevMap=%s, seen=%s, ambMap=%s]";
return String.format(fmt, wrds, abbrevMap, seen, ambMap);
}
}
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