8341445: DecimalFormatSymbols setters should throw NPE

Reviewed-by: naoto

src/java.base/share/classes/java/text/DecimalFormatSymbols.java

@@ -349,10 +349,11 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
      * unchanged.
      *
      * @param infinity the string representing infinity
+     * @throws NullPointerException if {@code infinity} is {@code null}
      */
     public void setInfinity(String infinity) {
+        this.infinity = Objects.requireNonNull(infinity);
         hashCode = 0;
-        this.infinity = infinity;
     }
 
     /**
@@ -370,10 +371,11 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
      * unchanged.
      *
      * @param NaN the string representing "not a number"
+     * @throws NullPointerException if {@code NaN} is {@code null}
      */
     public void setNaN(String NaN) {
+        this.NaN = Objects.requireNonNull(NaN);
         hashCode = 0;
-        this.NaN = NaN;
     }
 
     /**
@@ -414,14 +416,18 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
     }
 
     /**
-     * Sets the currency symbol for the currency of these
+     * Sets the currency symbol for the currency of this
-     * DecimalFormatSymbols in their locale.
+     * {@code DecimalFormatSymbols} in their locale. Unlike {@link
+     * #setInternationalCurrencySymbol(String)}, this method does not update
+     * the currency attribute nor the international currency symbol attribute.
      *
      * @param currency the currency symbol
+     * @throws NullPointerException if {@code currency} is {@code null}
      * @since 1.2
      */
     public void setCurrencySymbol(String currency)
     {
+        Objects.requireNonNull(currency);
         initializeCurrency(locale);
         hashCode = 0;
         currencySymbol = currency;
@@ -448,35 +454,29 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
      * this also sets the currency attribute to the corresponding Currency
      * instance and the currency symbol attribute to the currency's symbol
      * in the DecimalFormatSymbols' locale. If the currency code is not valid,
-     * then the currency attribute is set to null and the currency symbol
+     * then the currency attribute and the currency symbol attribute are not modified.
-     * attribute is not modified.
      *
      * @param currencyCode the currency code
+     * @throws NullPointerException if {@code currencyCode} is {@code null}
      * @see #setCurrency
      * @see #setCurrencySymbol
      * @since 1.2
      */
-    public void setInternationalCurrencySymbol(String currencyCode)
+    public void setInternationalCurrencySymbol(String currencyCode) {
-    {
+        Objects.requireNonNull(currencyCode);
+        // init over setting currencyInit flag as true so that currency has
+        // fallback if code is not valid
         initializeCurrency(locale);
         hashCode = 0;
         intlCurrencySymbol = currencyCode;
-        currency = null;
-        if (currencyCode != null) {
         try {
             currency = Currency.getInstance(currencyCode);
-                currencySymbol = currency.getSymbol();
+            currencySymbol = currency.getSymbol(locale);
-            } catch (IllegalArgumentException e) {
+        } catch (IllegalArgumentException _) {} // Simply ignore if not valid
-            }
-        }
     }
 
     /**
-     * Gets the currency of these DecimalFormatSymbols. May be null if the
+     * {@return the {@code Currency} of this {@code DecimalFormatSymbols}}
-     * currency symbol attribute was previously set to a value that's not
-     * a valid ISO 4217 currency code.
-     *
-     * @return the currency used, or null
      * @since 1.4
      */
     public Currency getCurrency() {
@@ -485,7 +485,7 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
     }
 
     /**
-     * Sets the currency of these DecimalFormatSymbols.
+     * Sets the currency of this {@code DecimalFormatSymbols}.
      * This also sets the currency symbol attribute to the currency's symbol
      * in the DecimalFormatSymbols' locale, and the international currency
      * symbol attribute to the currency's ISO 4217 currency code.
@@ -497,9 +497,7 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
      * @see #setInternationalCurrencySymbol
      */
     public void setCurrency(Currency currency) {
-        if (currency == null) {
+        Objects.requireNonNull(currency);
-            throw new NullPointerException();
-        }
         initializeCurrency(locale);
         hashCode = 0;
         this.currency = currency;
@@ -555,9 +553,7 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
      */
     public void setExponentSeparator(String exp)
     {
-        if (exp == null) {
+        Objects.requireNonNull(exp);
-            throw new NullPointerException();
-        }
         hashCode = 0;
         exponentialSeparator = exp;
     }
@@ -767,7 +763,8 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
             patternSeparator == other.patternSeparator &&
             infinity.equals(other.infinity) &&
             NaN.equals(other.NaN) &&
-            getCurrencySymbol().equals(other.getCurrencySymbol()) && // possible currency init occurs here
+            // Currency fields are lazy. Init via get call to ensure non-null
+            getCurrencySymbol().equals(other.getCurrencySymbol()) &&
             intlCurrencySymbol.equals(other.intlCurrencySymbol) &&
             currency == other.currency &&
             monetarySeparator == other.monetarySeparator &&
@@ -800,7 +797,8 @@ public class DecimalFormatSymbols implements Cloneable, Serializable {
                 patternSeparator,
                 infinity,
                 NaN,
-                getCurrencySymbol(), // possible currency init occurs here
+                // Currency fields are lazy. Init via get call to ensure non-null
+                getCurrencySymbol(),
                 intlCurrencySymbol,
                 currency,
                 monetarySeparator,

test/jdk/java/text/Format/DecimalFormat/SettersShouldThrowNPETest.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8341445
+ * @summary DFS setters should throw NPE. This ensures that NPE is not thrown
+ *          by equals().
+ * @run junit SettersShouldThrowNPETest
+ */
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.text.DecimalFormatSymbols;
+import java.util.Arrays;
+import java.util.Currency;
+import java.util.List;
+import java.util.Locale;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class SettersShouldThrowNPETest {
+
+    // The public setter methods that should throw NPE
+    private static final List<Method> NPE_SETTERS =
+            Arrays.stream(DecimalFormatSymbols.class.getDeclaredMethods())
+            .filter(m -> Modifier.isPublic(m.getModifiers())
+                    && m.getName().startsWith("set")
+                    && Stream.of(m.getParameterTypes()).noneMatch(Class::isPrimitive))
+            .toList();
+
+    // Non-primitive setters should throw NPE
+    @ParameterizedTest
+    @MethodSource("setters")
+    public void settersThrowNPETest(Method m) {
+        var dfs = new DecimalFormatSymbols();
+        InvocationTargetException e =
+                assertThrows(InvocationTargetException.class, () -> m.invoke(dfs, (Object) null));
+        if (!(e.getCause() instanceof NullPointerException)) {
+            throw new RuntimeException(e.getCause() + " was thrown instead of NPE by : " + m);
+        }
+    }
+
+    // Currency fields are lazy and can be null
+    // Ensure when exposed to users, they are never null
+    @ParameterizedTest
+    @MethodSource("locales")
+    public void lazyCurrencyFieldsTest(Locale locale) {
+        var dfs = new DecimalFormatSymbols(locale);
+        assertDoesNotThrow(() -> dfs.equals(new DecimalFormatSymbols()));
+        assertNotNull(dfs.getCurrency());
+        assertNotNull(dfs.getInternationalCurrencySymbol());
+        assertNotNull(dfs.getCurrencySymbol());
+    }
+
+    // Prior to 8341445, if the international currency symbol was invalid,
+    // the currency attribute was set to null. However, we should not have null
+    // currency fields post initializeCurrency() call. Ensure invalid code
+    // does not update the other fields.
+    @Test
+    public void setInternationalCurrencySymbolFallbackTest() {
+        var code = "fooBarBazQux";
+        // initialize() should provide null for all currency related fields
+        var dfs = new DecimalFormatSymbols(Locale.ROOT);
+        // Load the fallbacks via initCurrency() since the loc is Locale.ROOT
+        dfs.setInternationalCurrencySymbol(code); // set invalid code
+        // Ensure our values are the expected fallbacks, minus the updated intl code
+        assertEquals(Currency.getInstance("XXX"), dfs.getCurrency());
+        assertEquals("\u00A4", dfs.getCurrencySymbol());
+        assertEquals("fooBarBazQux", dfs.getInternationalCurrencySymbol());
+    }
+
+    private static List<Method> setters() {
+        return NPE_SETTERS;
+    }
+
+    private static List<Locale> locales() {
+        return List.of(Locale.ROOT, Locale.US, Locale.forLanguageTag("XXX"));
+    }
+}