Android Open Source - AstroPhysCalc Unit Selection Rule

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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;
//  w  w  w.  j  av  a 2  s  .  c om
public class UnitSelectionRule implements Comparable<UnitSelectionRule> {

  private final ValueAndUnits limit;
  private final ValueAndUnits units;

  public static UnitSelectionRule create(final ValueAndUnits limit) {
    return new UnitSelectionRule(limit, limit);
  }

  public static UnitSelectionRule create(final ValueAndUnits limit, final ValueAndUnits units) {
    return new UnitSelectionRule(limit, units);
  }

  public static UnitSelectionRule create(final ValueAndUnits limit, final UnitExpression expr) {
    return new UnitSelectionRule(limit, ValueAndUnits.create(1d, expr));
  }

  public static UnitSelectionRule create(final UnitExpression expr) {
    return new UnitSelectionRule(ValueAndUnits.create(1d, expr), ValueAndUnits.create(1d, expr));
  }

  private UnitSelectionRule(final ValueAndUnits limit, final ValueAndUnits units) {
    this.limit = limit;
    this.units = units;
  }

  public ValueAndUnits getLimit() {
    return limit;
  }

  public ValueAndUnits getUnits() {
    return units;
  }

  /**
   *  The requirement for equality here is less stringent than that of ValueAndUnits.equals().
   *  Here, we consider ValueAndUnits(1, KM) to be equal to ValueAndUnits(1000, M), for example, even though
   *  ValueAndUnits.equals() returns false in that case.
   */
  @Override
  public boolean equals(Object object2) {
    if (!(object2 instanceof UnitSelectionRule)) {
      return false;
    }

    final UnitSelectionRule rule2 = (UnitSelectionRule) object2;

    return limit.toBaseUnits().equals(rule2.getLimit().toBaseUnits())
        && units.toBaseUnits().equals(rule2.getUnits().toBaseUnits());
  }

  @Override
  public int hashCode() {
    return limit.hashCode() ^ units.hashCode();
  }

  @Override
  public String toString() {
    return UnitSelectionRule.class.getSimpleName() + ": " + limit.toString() + ", "+ units.toString();
  }

  /**
   * Descending order - rules with the greatest values first.
   */
  @Override
  public int compareTo(UnitSelectionRule rule2) {
    if (rule2 == null) {
      throw new NullPointerException();
    }

    return rule2.getLimit().compareTo(limit);
  }

}

Java Source Code List