Version 8, September 2009

[GpsPrune.git] / tim / prune / data / NumberUtils.java

diff --git a/tim/prune/data/NumberUtils.java b/tim/prune/data/NumberUtils.java
new file mode 100644 (file)
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+++ b/tim/prune/data/NumberUtils.java
@@ -0,0 +1,55 @@
+package tim.prune.data;
+
+import java.text.DecimalFormat;
+import java.text.NumberFormat;
+import java.util.Locale;
+
+/**
+ * Abstract class to offer general number manipulation functions
+ */
+public abstract class NumberUtils
+{
+       /** Number formatter object to avoid lots of instantiations */
+       private static final NumberFormat NUM_FORMATTER = NumberFormat.getNumberInstance(Locale.UK);
+       // Select the UK locale for this formatter so that decimal point is always used (not comma)
+       static {
+               if (NUM_FORMATTER instanceof DecimalFormat) ((DecimalFormat) NUM_FORMATTER).applyPattern("0.000");
+       }
+
+       /**
+        * Find the number of decimal places represented in the String
+        * @param inString String to check
+        * @return number of decimal places, or 0 for integer value
+        */
+       public static int getDecimalPlaces(String inString)
+       {
+               if (inString == null || inString.equals("")) {return 0;}
+               int places = 0;
+               final int sLen = inString.length();
+               for (int i=sLen-1; i>=0; i--) {
+                       char c = inString.charAt(i);
+                       if (c >= '0' && c <= '9') {
+                               // Numeric character found
+                               places++;
+                       }
+                       else {
+                               // Non-numeric character found, return places
+                               return places;
+                       }
+               }
+               // No non-numeric characters found, so must be integer
+               return 0;
+       }
+
+       /**
+        * Format the given number to the given number of decimal places
+        * @param inNumber double number to format
+        * @param inDecimalPlaces number of decimal places
+        */
+       public static String formatNumber(double inNumber, int inDecimalPlaces)
+       {
+               NUM_FORMATTER.setMaximumFractionDigits(inDecimalPlaces);
+               NUM_FORMATTER.setMinimumFractionDigits(inDecimalPlaces);
+               return NUM_FORMATTER.format(inNumber);
+       }
+}
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