ICU-5491 put back functionality for negative multipliers, fixed up some code to handle them correctly, and added tests.

X-SVN-Rev: 23228

icu4c/source/i18n/decimfmt.cpp

@@ -641,7 +641,8 @@ DecimalFormat::format(int64_t number,
     // instead, trading off accuracy for range.
     if (fRoundingIncrement != NULL
         || (fMultiplier != 0 && (number > (U_INT64_MAX / fMultiplier)
-                              || number < (U_INT64_MIN / fMultiplier))))
+                              || number < (U_INT64_MIN / fMultiplier)
+                              || number == U_INT64_MIN && fMultiplier < 0)))
     {
         digits.set(((double)number) * fMultiplier,
                    precision(FALSE),
@@ -682,6 +683,13 @@ DecimalFormat::format(  double number,
         return appendTo;
     }
 
+    // Do this BEFORE checking to see if value is infinite or negative! Sets the
+    // begin and end index to be length of the string composed of
+    // localized name of Infinite and the positive/negative localized
+    // signs.
+
+    number *= fMultiplier;
+
     /* Detecting whether a double is negative is easy with the exception of
      * the value -0.0.  This is a double which has a zero mantissa (and
      * exponent), but a negative sign bit.  It is semantically distinct from
@@ -694,13 +702,6 @@ DecimalFormat::format(  double number,
      */
     UBool isNegative = uprv_isNegative(number);
 
-    // Do this BEFORE checking to see if value is infinite! Sets the
-    // begin and end index to be length of the string composed of
-    // localized name of Infinite and the positive/negative localized
-    // signs.
-
-    number *= fMultiplier;
-
     // Apply rounding after multiplier
     if (fRoundingIncrement != NULL) {
         if (isNegative)     // For rounding in the correct direction
@@ -2100,10 +2101,10 @@ int32_t DecimalFormat::getMultiplier() const
 void
 DecimalFormat::setMultiplier(int32_t newValue)
 {
-//    if (newValue <= 0) {
-//        throw new IllegalArgumentException("Bad multiplier: " + newValue);
-//    }
-    if (newValue > 0) {
+//  if (newValue == 0) {
+//      throw new IllegalArgumentException("Bad multiplier: " + newValue);
+//  }
+    if (newValue != 0) {
         fMultiplier = newValue;
     }
     // else No way to return an error.

icu4c/source/test/intltest/numfmtst.cpp

@@ -85,6 +85,7 @@ void NumberFormatTest::runIndexedTest( int32_t index, UBool exec, const char* &n
         CASE(33,TestHostClone);
         CASE(34,TestCurrencyFormat);
         CASE(35,TestRounding);
+        CASE(36,TestNonpositiveMultiplier);
         default: name = ""; break;
     }
 }
@@ -2409,4 +2410,52 @@ double NumberFormatTest::checkRound(DecimalFormat* df, double iValue, double las
     return lastParsed;
 }
 
+void NumberFormatTest::TestNonpositiveMultiplier() {
+    UErrorCode status = U_ZERO_ERROR;
+    DecimalFormatSymbols US(Locale::getUS(), status);
+    CHECK(status, "DecimalFormatSymbols constructor");
+    DecimalFormat df(UnicodeString("0"), US, status);
+    CHECK(status, "DecimalFormat(0)");
+    
+    // test zero multiplier
+
+    int32_t mult = df.getMultiplier();
+    df.setMultiplier(0);
+    if (df.getMultiplier() != mult) {
+        errln("DecimalFormat.setMultiplier(0) did not ignore its zero input");
+    }
+    
+    // test negative multiplier
+    
+    df.setMultiplier(-1);
+    if (df.getMultiplier() != -1) {
+        errln("DecimalFormat.setMultiplier(-1) ignored its negative input");
+        return;
+    }
+    
+    expect(df, "1122.123", -1122.123);
+    expect(df, "-1122.123", 1122.123);
+    expect(df, "1.2", -1.2);
+    expect(df, "-1.2", 1.2);
+
+    // TODO: comment once BigInteger is ported
+    // (right now the big numbers get turned into doubles and lose tons of accuracy)
+    expect(df, U_INT64_MIN, "9223372036854780000");
+
+    // TODO: uncomment (and fix up) once BigInteger is ported and DecimalFormat can handle it
+    // (right now the big numbers get turned into doubles and lose tons of accuracy)
+    //expect2(df, U_INT64_MAX, Int64ToUnicodeString(-U_INT64_MAX));
+    //expect2(df, U_INT64_MIN, UnicodeString(Int64ToUnicodeString(U_INT64_MIN), 1));
+    //expect2(df, U_INT64_MAX / 2, Int64ToUnicodeString(-(U_INT64_MAX / 2)));
+    //expect2(df, U_INT64_MIN / 2, Int64ToUnicodeString(-(U_INT64_MIN / 2)));
+
+    // TODO: uncomment (and fix up) once BigDecimal is ported and DecimalFormat can handle it
+    //expect2(df, BigDecimal.valueOf(Long.MAX_VALUE), BigDecimal.valueOf(Long.MAX_VALUE).negate().toString());
+    //expect2(df, BigDecimal.valueOf(Long.MIN_VALUE), BigDecimal.valueOf(Long.MIN_VALUE).negate().toString());
+    //expect2(df, java.math.BigDecimal.valueOf(Long.MAX_VALUE), java.math.BigDecimal.valueOf(Long.MAX_VALUE).negate().toString());
+    //expect2(df, java.math.BigDecimal.valueOf(Long.MIN_VALUE), java.math.BigDecimal.valueOf(Long.MIN_VALUE).negate().toString());
+}
+
+
+
 #endif /* #if !UCONFIG_NO_FORMATTING */

icu4c/source/test/intltest/numfmtst.h

@@ -129,6 +129,8 @@ class NumberFormatTest: public CalendarTimeZoneTest {
     
     /* Port of ICU4J rounding test. */
     void TestRounding(void);
+
+    void TestNonpositiveMultiplier(void);
  private:
 
     static UBool equalValue(const Formattable& a, const Formattable& b);