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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 {
/* The source die to compound. */
private final Die source;
/* The predicate that marks when to compound. */
private final Predicate<Long> compoundOn;
/* The string version of the predicate, if one exists. */
private final 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(final Die src, final 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(final Die src, final Predicate<Long> compound, final String patt) {
source = src;
compoundOn = compound;
compoundPattern = patt;
}
@Override
public boolean canOptimize() {
if (source.canOptimize()) {
/* We can only be optimized for a result of zero. */
return source.optimize() == 0;
}
return false;
}
@Override
public long optimize() {
/* If we can be optimized, its to zero. */
return 0;
}
@Override
public long roll() {
/* The current result. */
long res = source.roll();
/* The last result. */
long oldRes = res;
while (compoundOn.test(oldRes)) {
/* Compound while the result should be compounded. */
oldRes = source.rollSingle();
/* Accumulate. */
res += oldRes;
}
return res;
}
@Override
public long rollSingle() {
/* Just compound on an initial single role. */
long res = source.rollSingle();
/* The last result. */
long oldRes = res;
while (compoundOn.test(oldRes)) {
/* Compound while the result should be compounded. */
oldRes = source.rollSingle();
/* Accumulate. */
res += oldRes;
}
return res;
}
@Override
public String toString() {
String sourceString = source.toString();
/* Can't print a parseable version. */
if (compoundPattern == null) {
return String.format("%s!!<complex-pattern>", sourceString);
}
return String.format("%s!!%s", sourceString, compoundPattern);
}
}
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