Android Open Source - AstroPhysCalc Unit Selector

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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 w  w .ja va 2s.  co  m*/
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;


public class UnitSelector {

  // Orbits
  public static final UnitSelector ORBIT_MASS_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.createFromUnit(MassUnit.M_EARTH)),
      UnitSelectionRule.create(
          ValueAndUnits.createFromUnit(0.1d, MassUnit.M_JUP), UnitExpression.createFromUnit(MassUnit.M_JUP)),
      UnitSelectionRule.create(
          ValueAndUnits.createFromUnit(0.01d, MassUnit.M_SUN), UnitExpression.createFromUnit(MassUnit.M_SUN)));

  public static final UnitSelector ORBIT_RADIUS_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.createFromUnit(LengthUnit.LY)),
      UnitSelectionRule.create(
          ValueAndUnits.createFromUnit(1E6d, LengthUnit.KM), UnitExpression.createFromUnit(LengthUnit.AU)),
      UnitSelectionRule.create(UnitExpression.createFromUnit(LengthUnit.KM)));

  public static final UnitSelector ORBIT_PERIOD_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.createFromUnit(TimeUnit.S)),
      UnitSelectionRule.create(UnitExpression.createFromUnit(TimeUnit.MIN)),
      UnitSelectionRule.create(UnitExpression.createFromUnit(TimeUnit.HR)),
      UnitSelectionRule.create(UnitExpression.createFromUnit(TimeUnit.DAYS)),
      UnitSelectionRule.create(UnitExpression.createFromUnit(TimeUnit.YEARS)));


  // Kinetic energy
  public static final UnitSelector KE_MASS_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.createFromUnit(MassUnit.G)),
      UnitSelectionRule.create(UnitExpression.createFromUnit(MassUnit.KG)));

  public static final UnitSelector KE_ENERGY_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.create(UnitAndDim.create(MassUnit.KG),
              UnitAndDim.create(LengthUnit.M, 2),
              UnitAndDim.create(TimeUnit.S, -2))));

  public static final UnitSelector KE_VELOCITY_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.create(UnitAndDim.create(LengthUnit.M),
      UnitAndDim.create(TimeUnit.S, -1))));


  // Brightness
  public static final UnitSelector FLUX_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.create(
          UnitAndDim.create(MassUnit.KG),
          UnitAndDim.create(TimeUnit.S, -3))),
      UnitSelectionRule.create(Constants.FS_EARTH.divideBy(ValueAndUnits.create(100d)),
          Constants.FS_EARTH));

  public static final UnitSelector FLUX_POWER_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.create(
          UnitAndDim.create(MassUnit.KG),
          UnitAndDim.create(LengthUnit.M, 2),
          UnitAndDim.create(TimeUnit.S, -3))),
      UnitSelectionRule.create(Constants.L_SUN));

  public static final UnitSelector FLUX_DISTANCE_SELECTOR = UnitSelector.create(
      UnitSelectionRule.create(UnitExpression.createFromUnit(LengthUnit.LY)),
      UnitSelectionRule.create(ValueAndUnits.createFromUnit(1E6d, LengthUnit.KM),
          UnitExpression.createFromUnit(LengthUnit.AU)),
      UnitSelectionRule.create(UnitExpression.createFromUnit(LengthUnit.KM)),
      UnitSelectionRule.create(UnitExpression.createFromUnit(LengthUnit.M)));


  private SortedSet<UnitSelectionRule> rules;

  public static UnitSelector create(final Set<UnitSelectionRule> rules) {
    final SortedSet<UnitSelectionRule> sortedRules = new TreeSet<UnitSelectionRule>();
    sortedRules.addAll(rules);
    return new UnitSelector(sortedRules);
  }

  private UnitSelector(final SortedSet<UnitSelectionRule> rules) {
    this.rules = rules;
  }

  public static UnitSelector create(final UnitSelectionRule ... rules) {
    final SortedSet<UnitSelectionRule> ruleSet = new TreeSet<UnitSelectionRule>();
    for (UnitSelectionRule rule : rules) {
      ruleSet.add(rule);
    }
    return new UnitSelector(ruleSet);
  }

  public UnitSelector addRule(final UnitSelectionRule rule) {
    getRules().add(rule);
    return this;
  }

  public ValueAndUnits getPreferredUnits(final ValueAndUnits vu) {
    if (rules.size() == 0) {
      return null;
    }
    for (UnitSelectionRule rule : rules) {
      if (!vu.isLessThan(rule.getLimit())) {
        return rule.getUnits();
      }
    }
    return rules.last().getUnits();
  }

  private Set<UnitSelectionRule> getRules() {
    return rules;
  }
}
Java Source Code List
