altoslib: Add imperial units conversion support

[fw/altos] / altoslib / AltosUnits.java

diff --git a/altoslib/AltosUnits.java b/altoslib/AltosUnits.java
new file mode 100644 (file)
index 0000000..47540c6
--- /dev/null
+++ b/altoslib/AltosUnits.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+package org.altusmetrum.AltosLib;
+
+public abstract class AltosUnits {
+
+       public abstract double value(double v);
+
+       public abstract String show_units();
+
+       public abstract String say_units();
+
+       abstract int show_fraction(int width);
+
+       int say_fraction() {
+               return 0;
+       }
+
+       private String show_format(int width) {
+               return String.format("%%%d.%df %s", width, show_fraction(width), show_units());
+       }
+
+       private String say_format() {
+               return String.format("%%1.%df", say_fraction());
+       }
+
+       private String say_units_format() {
+               return String.format("%%1.%df %s", say_fraction(), say_units());
+       }
+
+       public String show(int width, double v) {
+               return String.format(show_format(width), value(v));
+       }
+
+       public String say(double v) {
+               return String.format(say_format(), value(v));
+       }
+
+       public String say_units(double v) {
+               return String.format(say_units_format(), value(v));
+       }
+}
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