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Perform numeric conversion for primitive numeric type adapters #2158

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merged 3 commits into from Oct 4, 2022
Merged

Perform numeric conversion for primitive numeric type adapters #2158

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0b6937f
Perform numeric conversion for primitive numeric type adapters
Marcono1234 Jul 25, 2022
9768d6b
Don't call `JsonWriter.value(float)` for backward compatibility
Marcono1234 Oct 3, 2022
e7a5a08
Fix typo in comments
Marcono1234 Oct 3, 2022
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4 changes: 2 additions & 2 deletions gson/src/main/java/com/google/gson/Gson.java
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Expand Up @@ -398,7 +398,7 @@ private TypeAdapter<Number> doubleAdapter(boolean serializeSpecialFloatingPointV
}
double doubleValue = value.doubleValue();
checkValidFloatingPoint(doubleValue);
out.value(value);
out.value(doubleValue);
}
};
}
Expand All @@ -422,7 +422,7 @@ private TypeAdapter<Number> floatAdapter(boolean serializeSpecialFloatingPointVa
}
float floatValue = value.floatValue();
checkValidFloatingPoint(floatValue);
out.value(value);
out.value(floatValue);
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When I ran this PR against all of Google's tests, I found two failures, both linked to this line. The problem is that we've only had JsonWriter.value(float) since #2130. If people subclassed JsonWriter before then and overrode all of the value methods, they won't have overridden value(float).

Maybe that kind of subclassing is questionable, I'm not sure. It's certainly rare: we have only 5 subclasses of JsonWriter, though 3 of them do override the value methods. Still, I think it would safest to undo this change, and then probably also the change in doubleAdapter for symmetry.

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Hmm ok, I think I also need to adjust then TypeAdapters.FLOAT as well because that now calls value(float) too. To keep the numeric conversion but also remain backward compatible it is now checking that the value is a Float, converting it if necessary and calls value(Number) again.

I am not changing doubleAdapter though since that is similar to the TypeAdapters changes.

}
};
}
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36 changes: 30 additions & 6 deletions gson/src/main/java/com/google/gson/internal/bind/TypeAdapters.java
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Expand Up @@ -194,7 +194,11 @@ public Number read(JsonReader in) throws IOException {
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
if (value == null) {
out.nullValue();
} else {
out.value(value.byteValue());
}
}
};

Expand Down Expand Up @@ -223,7 +227,11 @@ public Number read(JsonReader in) throws IOException {
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
if (value == null) {
out.nullValue();
} else {
out.value(value.shortValue());
}
}
};

Expand All @@ -245,7 +253,11 @@ public Number read(JsonReader in) throws IOException {
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
if (value == null) {
out.nullValue();
} else {
out.value(value.intValue());
}
}
};
public static final TypeAdapterFactory INTEGER_FACTORY
Expand Down Expand Up @@ -323,7 +335,11 @@ public Number read(JsonReader in) throws IOException {
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
if (value == null) {
out.nullValue();
} else {
out.value(value.longValue());
}
}
};

Expand All @@ -338,7 +354,11 @@ public Number read(JsonReader in) throws IOException {
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
if (value == null) {
out.nullValue();
} else {
out.value(value.floatValue());
}
}
};

Expand All @@ -353,7 +373,11 @@ public Number read(JsonReader in) throws IOException {
}
@Override
public void write(JsonWriter out, Number value) throws IOException {
out.value(value);
if (value == null) {
out.nullValue();
} else {
out.value(value.doubleValue());
}
}
};

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60 changes: 60 additions & 0 deletions gson/src/test/java/com/google/gson/functional/PrimitiveTest.java
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Expand Up @@ -64,6 +64,11 @@ public void testPrimitiveIntegerAutoboxedDeserialization() {
public void testByteSerialization() {
assertEquals("1", gson.toJson(1, byte.class));
assertEquals("1", gson.toJson(1, Byte.class));
assertEquals(Byte.toString(Byte.MIN_VALUE), gson.toJson(Byte.MIN_VALUE, Byte.class));
assertEquals(Byte.toString(Byte.MAX_VALUE), gson.toJson(Byte.MAX_VALUE, Byte.class));
// Should perform narrowing conversion
assertEquals("-128", gson.toJson(128, Byte.class));
assertEquals("1", gson.toJson(1.5, Byte.class));
}

public void testByteDeserialization() {
Expand Down Expand Up @@ -102,6 +107,13 @@ public void testByteDeserializationLossy() {
public void testShortSerialization() {
assertEquals("1", gson.toJson(1, short.class));
assertEquals("1", gson.toJson(1, Short.class));
assertEquals(Short.toString(Short.MIN_VALUE), gson.toJson(Short.MIN_VALUE, Short.class));
assertEquals(Short.toString(Short.MAX_VALUE), gson.toJson(Short.MAX_VALUE, Short.class));
// Should perform widening conversion
assertEquals("1", gson.toJson((byte) 1, Short.class));
// Should perform narrowing conversion
assertEquals("-32768", gson.toJson(32768, Short.class));
assertEquals("1", gson.toJson(1.5, Short.class));
}

public void testShortDeserialization() {
Expand Down Expand Up @@ -137,6 +149,54 @@ public void testShortDeserializationLossy() {
}
}

public void testIntSerialization() {
assertEquals("1", gson.toJson(1, int.class));
assertEquals("1", gson.toJson(1, Integer.class));
assertEquals(Integer.toString(Integer.MIN_VALUE), gson.toJson(Integer.MIN_VALUE, Integer.class));
assertEquals(Integer.toString(Integer.MAX_VALUE), gson.toJson(Integer.MAX_VALUE, Integer.class));
// Should perform widening conversion
assertEquals("1", gson.toJson((byte) 1, Integer.class));
// Should perform narrowing conversion
assertEquals("-2147483648", gson.toJson(2147483648L, Integer.class));
assertEquals("1", gson.toJson(1.5, Integer.class));
}

public void testLongSerialization() {
assertEquals("1", gson.toJson(1L, long.class));
assertEquals("1", gson.toJson(1L, Long.class));
assertEquals(Long.toString(Long.MIN_VALUE), gson.toJson(Long.MIN_VALUE, Long.class));
assertEquals(Long.toString(Long.MAX_VALUE), gson.toJson(Long.MAX_VALUE, Long.class));
// Should perform widening conversion
assertEquals("1", gson.toJson((byte) 1, Long.class));
// Should perform narrowing conversion
assertEquals("1", gson.toJson(1.5, Long.class));
}

public void testFloatSerialization() {
assertEquals("1.5", gson.toJson(1.5f, float.class));
assertEquals("1.5", gson.toJson(1.5f, Float.class));
assertEquals(Float.toString(Float.MIN_VALUE), gson.toJson(Float.MIN_VALUE, Float.class));
assertEquals(Float.toString(Float.MAX_VALUE), gson.toJson(Float.MAX_VALUE, Float.class));
// Should perform widening conversion
assertEquals("1.0", gson.toJson((byte) 1, Float.class));
// (This widening conversion is actually lossy)
assertEquals(Float.toString(Long.MAX_VALUE - 10L), gson.toJson(Long.MAX_VALUE - 10L, Float.class));
// Should perform narrowing conversion
gson = new GsonBuilder().serializeSpecialFloatingPointValues().create();
assertEquals("Infinity", gson.toJson(Double.MAX_VALUE, Float.class));
}

public void testDoubleSerialization() {
assertEquals("1.5", gson.toJson(1.5, double.class));
assertEquals("1.5", gson.toJson(1.5, Double.class));
assertEquals(Double.toString(Double.MIN_VALUE), gson.toJson(Double.MIN_VALUE, Double.class));
assertEquals(Double.toString(Double.MAX_VALUE), gson.toJson(Double.MAX_VALUE, Double.class));
// Should perform widening conversion
assertEquals("1.0", gson.toJson((byte) 1, Double.class));
// (This widening conversion is actually lossy)
assertEquals(Double.toString(Long.MAX_VALUE - 10L), gson.toJson(Long.MAX_VALUE - 10L, Double.class));
}

public void testPrimitiveIntegerAutoboxedInASingleElementArraySerialization() {
int target[] = {-9332};
assertEquals("[-9332]", gson.toJson(target));
Expand Down