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Use static PropertyNamingStrategy instances in POJOPropertiesCollector._findNamingStrategy() #4109

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Use static PropertyNamingStrategy instances in POJOPropertiesCollector._findNamingStrategy() #4109

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Use static PropertyNamingStrategy instances in POJOPropertiesCollecto…
takezoe Sep 8, 2023
0c4e911
Move switching logic to PropertyNamingStrategies
takezoe Oct 7, 2023
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44 changes: 44 additions & 0 deletions src/main/java/com/fasterxml/jackson/databind/introspect/POJOPropertiesCollector.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1450,6 +1450,50 @@ private PropertyNamingStrategy _findNamingStrategy()
return pns;
}
}

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@JooHyukKim JooHyukKim Sep 11, 2023 •
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// Plz check Line 1448
PropertyNamingStrategy pns = hi.namingStrategyInstance(_config, _classDef, namingClass);

Possibly, at line 1448 (above) HandlerInstantiator is also doing what we are trying to prevent to happen here. namingStrategyInstance() JavaDoc says....

/**
  * Method called to construct a NamingStrategy instance used for specified
  * class.
  *
  * @since 2.1
  */

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@takezoe takezoe Oct 7, 2023 •
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HandlerInstantiator is given through configuration and it can return any instance of PropertyNamingStrategy. I think we can't rescue if HandlerInstantiator is used.

// PropertyNamingStrategy
if (namingClass == PropertyNamingStrategy.SnakeCaseStrategy.class) {
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can this list of if stmts be made into a switch stmt with cases instead?

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As far as I know the baseline version Java 8 doesn't support switch for Class 🧐

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If we were to do this, I think switch logic should be moved into a static method of PropertyNamingStrategies, so here we would just call that method.

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Moved switching logic to PropertyNamingStrategies and added a test case.

return PropertyNamingStrategies.SNAKE_CASE;
}
if (namingClass == PropertyNamingStrategy.UpperCamelCaseStrategy.class) {
return PropertyNamingStrategies.UPPER_CAMEL_CASE;
}
if (namingClass == PropertyNamingStrategy.KebabCaseStrategy.class) {
return PropertyNamingStrategies.KEBAB_CASE;
}
if (namingClass == PropertyNamingStrategy.LowerDotCaseStrategy.class) {
return PropertyNamingStrategies.LOWER_DOT_CASE;
}
if (namingClass == PropertyNamingStrategy.LowerCaseWithUnderscoresStrategy.class) {
return PropertyNamingStrategies.SNAKE_CASE;
}
if (namingClass == PropertyNamingStrategy.PascalCaseStrategy.class) {
return PropertyNamingStrategies.UPPER_CAMEL_CASE;
}

// PropertyNamingStrategies
if (namingClass == PropertyNamingStrategies.SnakeCaseStrategy.class) {
return PropertyNamingStrategies.SNAKE_CASE;
}
if (namingClass == PropertyNamingStrategies.UpperSnakeCaseStrategy.class) {
return PropertyNamingStrategies.UPPER_SNAKE_CASE;
}
if (namingClass == PropertyNamingStrategies.LowerCamelCaseStrategy.class) {
return PropertyNamingStrategies.LOWER_CAMEL_CASE;
}
if (namingClass == PropertyNamingStrategies.UpperCamelCaseStrategy.class) {
return PropertyNamingStrategies.UPPER_CAMEL_CASE;
}
if (namingClass == PropertyNamingStrategies.LowerCaseStrategy.class) {
return PropertyNamingStrategies.LOWER_CASE;
}
if (namingClass == PropertyNamingStrategies.KebabCaseStrategy.class) {
return PropertyNamingStrategies.KEBAB_CASE;
}
if (namingClass == PropertyNamingStrategies.LowerDotCaseStrategy.class) {
return PropertyNamingStrategies.LOWER_DOT_CASE;
}

return (PropertyNamingStrategy) ClassUtil.createInstance(namingClass,
_config.canOverrideAccessModifiers());
}
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