Android Open Source - dice-probabilities Constant Distribution

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License

The source code is released under:

MIT License

Java Source Code

package org.kleemann.diceprobabilities.distribution;
/* ww  w . j  a va2 s  .c o  m*/
import org.apache.commons.math3.fraction.BigFraction;

/**
 * <p>
 * A distribution that has 100% chance at a single point. This is useful for
 * representing constants that are added to dice rolls.
 */
public class ConstantDistribution extends AbstractDistribution {

  /**
   * Useful as a starting value when summing lots of distributions
   */
  static public final Distribution ZERO = new ConstantDistribution(0);

  private int x;

  public ConstantDistribution(int x) {
    this.x = x;
  }

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

  @Override
  public int upperBound() {
    return x + 1;
  }

  @Override
  public BigFraction getProbability(int x) {
    return x == this.x ? BigFraction.ONE : BigFraction.ZERO;
  }

  @Override
  public BigFraction getCumulativeProbability(int x) {
    return x > this.x ? BigFraction.ZERO : BigFraction.ONE;
  }
  
  /**
   * <p>
   * This class has an efficient getCumulativeProbability(x)
   */
  @Override
  public Distribution cacheCumulative() {
    return this;
  }
}

Java Source Code List

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