number formatter (thx to guy from stackoverflow)

1 files changed, 32 insertions, 0 deletions

diff --git a/core/src/com/ilotterytea/maxoning/utils/formatters/NumberFormatter.java b/core/src/com/ilotterytea/maxoning/utils/formatters/NumberFormatter.java
new file mode 100644
index 0000000..96c0258
--- /dev/null
+++ b/core/src/com/ilotterytea/maxoning/utils/formatters/NumberFormatter.java
@@ -0,0 +1,32 @@
+package com.ilotterytea.maxoning.utils.formatters;
+
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.TreeMap;
+
+public class NumberFormatter {
+    private static final NavigableMap<Long, String> suffixes = new TreeMap<>();
+    static {
+        suffixes.put(1_000L, "k");
+        suffixes.put(1_000_000L, "M");
+        suffixes.put(1_000_000_000L, "G");
+        suffixes.put(1_000_000_000_000L, "T");
+        suffixes.put(1_000_000_000_000_000L, "P");
+        suffixes.put(1_000_000_000_000_000_000L, "E");
+    }
+
+    public static String format(long value) {
+        //Long.MIN_VALUE == -Long.MIN_VALUE so we need an adjustment here
+        if (value == Long.MIN_VALUE) return format(Long.MIN_VALUE + 1);
+        if (value < 0) return "-" + format(-value);
+        if (value < 1000) return Long.toString(value); //deal with easy case
+
+        Map.Entry<Long, String> e = suffixes.floorEntry(value);
+        Long divideBy = e.getKey();
+        String suffix = e.getValue();
+
+        long truncated = value / (divideBy / 10); //the number part of the output times 10
+        boolean hasDecimal = truncated < 100 && (truncated / 10d) != (truncated / 10);
+        return hasDecimal ? (truncated / 10d) + suffix : (truncated / 10) + suffix;
+    }
+}