01: /*
02: * JScience - Java(TM) Tools and Libraries for the Advancement of Sciences.
03: * Copyright (C) 2006 - JScience (http://jscience.org/)
04: * All rights reserved.
05: *
06: * Permission to use, copy, modify, and distribute this software is
07: * freely granted, provided that this notice is preserved.
08: */
09: package javax.measure.unit;
10:
11: import java.util.Set;
12:
13: /**
14: * <p> This class represents a system of units, it groups units together
15: * for historical or cultural reasons. Nothing prevents a unit from
16: * belonging to several system of units at the same time
17: * (for example an imperial system would have many of the units
18: * held by {@link NonSI}).</p>
19: *
20: * @author <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
21: * @version 4.2, August 26, 2007
22: */
23: public abstract class SystemOfUnits {
24:
25: /**
26: * Returns a read only view over the units defined in this system.
27: *
28: * @return the collection of units.
29: */
30: public abstract Set<Unit<?>> getUnits();
31:
32: }
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