Merge Argeo Util and parts of Argeo JCR in Argeo Core.

[lgpl/argeo-commons.git] / org.argeo.core / src / org / argeo / util / Throughput.java

diff --git a/org.argeo.core/src/org/argeo/util/Throughput.java b/org.argeo.core/src/org/argeo/util/Throughput.java
new file mode 100644 (file)
index 0000000..266ddbc
--- /dev/null
+++ b/org.argeo.core/src/org/argeo/util/Throughput.java
@@ -0,0 +1,82 @@
+package org.argeo.util;
+
+import java.text.NumberFormat;
+import java.text.ParseException;
+import java.util.Locale;
+
+/** A throughput, that is, a value per unit of time. */
+public class Throughput {
+       private final static NumberFormat usNumberFormat = NumberFormat.getInstance(Locale.US);
+
+       public enum Unit {
+               s, m, h, d
+       }
+
+       private final Double value;
+       private final Unit unit;
+
+       public Throughput(Double value, Unit unit) {
+               this.value = value;
+               this.unit = unit;
+       }
+
+       public Throughput(Long periodMs, Long count, Unit unit) {
+               if (unit.equals(Unit.s))
+                       value = ((double) count * 1000d) / periodMs;
+               else if (unit.equals(Unit.m))
+                       value = ((double) count * 60d * 1000d) / periodMs;
+               else if (unit.equals(Unit.h))
+                       value = ((double) count * 60d * 60d * 1000d) / periodMs;
+               else if (unit.equals(Unit.d))
+                       value = ((double) count * 24d * 60d * 60d * 1000d) / periodMs;
+               else
+                       throw new IllegalArgumentException("Unsupported unit " + unit);
+               this.unit = unit;
+       }
+
+       public Throughput(Double value, String unitStr) {
+               this(value, Unit.valueOf(unitStr));
+       }
+
+       public Throughput(String def) {
+               int index = def.indexOf('/');
+               if (def.length() < 3 || index <= 0 || index != def.length() - 2)
+                       throw new IllegalArgumentException(
+                                       def + " no a proper throughput definition" + " (should be <value>/<unit>, e.g. 3.54/s or 1500/h");
+               String valueStr = def.substring(0, index);
+               String unitStr = def.substring(index + 1);
+               try {
+                       this.value = usNumberFormat.parse(valueStr).doubleValue();
+               } catch (ParseException e) {
+                       throw new IllegalArgumentException("Cannot parse " + valueStr + " as a number.", e);
+               }
+               this.unit = Unit.valueOf(unitStr);
+       }
+
+       public Long asMsPeriod() {
+               if (unit.equals(Unit.s))
+                       return Math.round(1000d / value);
+               else if (unit.equals(Unit.m))
+                       return Math.round((60d * 1000d) / value);
+               else if (unit.equals(Unit.h))
+                       return Math.round((60d * 60d * 1000d) / value);
+               else if (unit.equals(Unit.d))
+                       return Math.round((24d * 60d * 60d * 1000d) / value);
+               else
+                       throw new IllegalArgumentException("Unsupported unit " + unit);
+       }
+
+       @Override
+       public String toString() {
+               return usNumberFormat.format(value) + '/' + unit;
+       }
+
+       public Double getValue() {
+               return value;
+       }
+
+       public Unit getUnit() {
+               return unit;
+       }
+
+}