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EnumTypeAdapter constructor optimization #2734

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merged 3 commits into from
Sep 3, 2024
Merged

EnumTypeAdapter constructor optimization #2734

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c6b1964
EnumTypeAdapter constructor optimization
esaulpaugh Sep 3, 2024
83741ec
reuse the fields array
esaulpaugh Sep 3, 2024
bc435b3
add comment about the necessity of unconditionally trimming the field…
esaulpaugh Sep 3, 2024
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16 changes: 10 additions & 6 deletions gson/src/main/java/com/google/gson/internal/bind/EnumTypeAdapter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@
import java.io.IOException;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

Expand Down Expand Up @@ -59,17 +59,21 @@ private EnumTypeAdapter(final Class<T> classOfT) {
// Uses reflection to find enum constants to work around name mismatches for obfuscated
// classes
Field[] fields = classOfT.getDeclaredFields();
ArrayList<Field> constantFieldsList = new ArrayList<>(fields.length);
int constantCount = 0;
for (Field f : fields) {
// Filter out non-constant fields, replacing elements as we go
if (f.isEnumConstant()) {
constantFieldsList.add(f);
fields[constantCount++] = f;
}
}

Field[] constantFields = constantFieldsList.toArray(new Field[0]);
AccessibleObject.setAccessible(constantFields, true);
// Trim the array to the new length. Every enum type can be expected to have at least
// one declared field which is not an enum constant, namely the implicit $VALUES array
fields = Arrays.copyOf(fields, constantCount);

for (Field constantField : constantFields) {
AccessibleObject.setAccessible(fields, true);

for (Field constantField : fields) {
@SuppressWarnings("unchecked")
T constant = (T) constantField.get(null);
String name = constant.name();
Expand Down