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package bjc.dicelang.dice;
import java.util.function.Predicate;
/**
* Implements a compounding die.
*
* This means that the source will be rolled, and then more single rolls will be
* added while it meets a qualification.
*
* @author Ben Culkin
*/
public class CompoundingDie implements Die {
private Die source;
private Predicate<Long> compoundOn;
private String compoundPattern;
/**
* Create a new compounding die with no pattern.
*
* @param src
* The die to compound from
* @param compound
* The conditions to compound on
*/
public CompoundingDie(Die src, Predicate<Long> compound) {
this(src, compound, null);
}
/**
* Create a new compounding die with a specified pattern.
*
* @param src
* The die to compound from
* @param compound
* The conditions to compound on
* @param patt
* The string pattern the condition came from, for
* printing
*/
public CompoundingDie(Die src, Predicate<Long> compound, String patt) {
source = src;
compoundOn = compound;
compoundPattern = patt;
}
@Override
public boolean canOptimize() {
return source.canOptimize() && source.optimize() == 0;
}
@Override
public long optimize() {
return 0;
}
@Override
public long roll() {
long res = source.roll();
long oldRes = res;
while (compoundOn.test(oldRes)) {
oldRes = source.rollSingle();
res += oldRes;
}
return res;
}
@Override
public long rollSingle() {
/*
* Just compound on a single roll
*/
long res = source.rollSingle();
long oldRes = res;
while (compoundOn.test(oldRes)) {
oldRes = source.rollSingle();
res += oldRes;
}
return res;
}
@Override
public String toString() {
if (compoundPattern == null) {
return source + "!!";
} else {
return source + "!!" + compoundPattern;
}
}
}
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