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package com.wcohen.ss;
import java.util.*;
import com.wcohen.ss.tokens.*;
import com.wcohen.ss.api.*;
/**
* A string, with an associated bag of tokens. Each token has an
* associated weight.
*
*/
class BagOfTokens extends BasicStringWrapper
{
private Map weightMap = new TreeMap();
private double totalWeight = 0;
private Token[] tokens;
BagOfTokens(String s,Token[] tokens)
{
super(s);
this.tokens = tokens;
for (int i=0; i<tokens.length; i++) {
weightMap.put(tokens[i], new Double(getWeight(tokens[i])+1) );
}
totalWeight = tokens.length;
}
/** Iterates over all tokens in the bag. */
Iterator tokenIterator() {
return weightMap.keySet().iterator();
}
/** Test if this token appears at least once. */
boolean contains(Token tok) {
return weightMap.get(tok)!=null;
}
/** Weight associated with a token: by default, the number of times
* the token appears in the bag. */
double getWeight(Token tok) {
Double f = (Double)weightMap.get(tok);
return f==null ? 0 : f.doubleValue();
}
/** Change the weight of a token in the bag */
void setWeight(Token tok, double d) {
Double oldWeight = (Double)weightMap.get(tok);
totalWeight += oldWeight==null ? d : (d - oldWeight.doubleValue());
weightMap.put(tok,new Double(d));
}
/** Number of distinct tokens in the bag. */
int size() {
return weightMap.keySet().size();
}
/** Total weight of all tokens in bag */
double getTotalWeight() {
return totalWeight;
}
/** Return array of tokens */
Token[] getTokens() {
return tokens;
}
}
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