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Better formatting in Utils.bitcoinValueToFriendlyString

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This commit is contained in:
Mike Hearn 2013-01-09 23:41:32 +01:00
parent f2a6e41c82
commit 0bdfa7b635
2 changed files with 15 additions and 4 deletions
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18
core/src/main/java/com/google/bitcoin/core/Utils.java
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@ -294,15 +294,25 @@ public class Utils {
}
/**
* Returns the given value in nanocoins as a 0.12 type string.
* Returns the given value in nanocoins as a 0.12 type string. More digits after the decimal place will be used
* if necessary, but two will always be present.
*/
public static String bitcoinValueToFriendlyString(BigInteger value) {
// TODO: This API is crap. This method should go away when we encapsulate money values.
boolean negative = value.compareTo(BigInteger.ZERO) < 0;
if (negative)
value = value.negate();
BigInteger coins = value.divide(COIN);
BigInteger cents = value.remainder(COIN);
return String.format("%s%d.%02d", negative ? "-" : "", coins.intValue(), cents.intValue() / 1000000);
BigDecimal bd = new BigDecimal(value, 8);
String formatted = bd.toPlainString(); // Don't use scientific notation.
// Drop unnecessary zeros from the end.
int toDelete = 0;
for (int i = formatted.length() - 1; i > 1; i--) {
if (formatted.charAt(i) == '0')
toDelete++;
else
break;
}
return (negative ? "-" : "") + formatted.substring(0, formatted.length() - toDelete);
}
/**

1
core/src/test/java/com/google/bitcoin/core/UtilsTest.java
View File

@ -51,6 +51,7 @@ public class UtilsTest {
@Test
public void testFormatting() {
assertEquals("1.23", bitcoinValueToFriendlyString(toNanoCoins(1, 23)));
assertEquals("0.001", bitcoinValueToFriendlyString(BigInteger.valueOf(COIN.longValue() / 1000)));
assertEquals("-1.23", bitcoinValueToFriendlyString(toNanoCoins(1, 23).negate()));
}