Android Open Source - dice-probabilities Death Zone Die Distribution

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License

The source code is released under:

MIT License

Java Source Code

package org.kleemann.diceprobabilities.distribution;
//from  ww w  .  ja  v a2 s . c o  m
import org.apache.commons.math3.fraction.BigFraction;

/**
 * Similar to a normal die except ones and twos count as zeros
 */
public class DeathZoneDieDistribution extends AbstractDistribution {

  // the total number of sides of the die
  private final int sides;

  // the equal probability of getting any side of the die
  // cache this for efficiency
  private final BigFraction probability;

  public DeathZoneDieDistribution(int sides) {
    assert (sides > 2);
    this.sides = sides;
    this.probability = new BigFraction(1, sides);
  }

  public int getSides() {
    return sides;
  }

  @Override
  public int lowerBound() {
    return 0;
  }

  @Override
  public int upperBound() {
    // sides are one based. e.g. a six sided die uses the x values
    // 1 through 6 inclusive
    return sides + 1;
  }

  @Override
  public BigFraction getProbabilityBounded(int x) {
    if (x == 0) {
      return probability.multiply(2);
    } else if (x == 1 || x == 2) {
      return BigFraction.ZERO;
    } else {
      return probability;
    }
  }
}

Java Source Code List

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