Android Open Source - AstroPhysCalc Dimension

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Back to project page AstroPhysCalc.

License

The source code is released under:

Apache License

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Java Source Code

package org.astrophyscalc;
/*from  w ww.ja v a  2s . c  om*/
public class Dimension {

  private final Fraction fraction;

  public static Dimension ONE = new Dimension(Fraction.ONE);
  public static Dimension ZERO = new Dimension(Fraction.ZERO);

  static final String DENOMINATOR_ZERO = "Denominator cannot be zero";

  public static Dimension create(final int numerator, final int denominator) {
    if (denominator == 0) {
      throw new IllegalArgumentException(DENOMINATOR_ZERO);
    }

    Fraction fraction = Fraction.create(numerator, denominator);
    if(fraction.isOne()) {
      return ONE;
    }
    if(fraction.isZero()) {
      return ZERO;
    }

    return new Dimension(fraction);
  }

  private Dimension(final Fraction fraction) {
    this.fraction = fraction;
  }

  public int getNumerator() {
    return fraction.getNumerator();
  }

  public int getDenominator() {
    return fraction.getDenominator();
  }

  public boolean isOne() {
    return fraction.isOne();
  }

  public boolean isZero() {
    return fraction.isZero();
  }

  public double toDouble() {
    return fraction.toDouble();
  }

  public Dimension add(final Dimension dim2) {
    // get sum of the two fractions
    final Fraction fraction2 = Fraction.create(dim2.getNumerator(), dim2.getDenominator());

    final Fraction newFraction = fraction.add(fraction2);

    final Dimension newDim = Dimension.create(newFraction.getNumerator(), newFraction.getDenominator());
    return newDim;
  }

  public Dimension subtract(final Dimension dim2) {
    final Dimension negDim2 = dim2.negative();
    return add(negDim2);
  }

  /**
   * Raises this dimension to the given power.
   *
   * @param exponent
   * @return
   */
  public Dimension pow(final Dimension exponent) {
    final Fraction newFraction = fraction.pow(exponent.toFraction());
    return Dimension.create(newFraction.getNumerator(), newFraction.getDenominator());
  }

  public Dimension negative() {
    return Dimension.create(-getNumerator(), getDenominator());
  }

  private Fraction toFraction() {
    return Fraction.create(getNumerator(), getDenominator());
  }

  @Override
  public boolean equals(final Object object) {

    if (!(object instanceof Dimension)) {
      return false;
    }

    Dimension dim = (Dimension) object;

    return fraction.equals(dim.fraction);
  }

  @Override public int hashCode() {
    return fraction.getNumerator() ^ fraction.getDenominator();
  }

  @Override public String toString() {
    return Dimension.class.getSimpleName() + ": " + fraction.getNumerator() + ", " + fraction.getDenominator();
  }

}

Java Source Code List