com.fasterxml.jackson.databind

## Class PropertyNamingStrategy

- java.lang.Object
- - com.fasterxml.jackson.databind.PropertyNamingStrategy

- All Implemented Interfaces:
    java.io.Serializable
  Direct Known Subclasses:
    PropertyNamingStrategy.PropertyNamingStrategyBase

      public class PropertyNamingStrategy
      extends java.lang.Object
      implements java.io.Serializable

  Class that defines how names of JSON properties ("external names") are derived from names of POJO methods and fields ("internal names"), in cases where they are not auto-detected and no explicit annotations exist for naming. Methods are passed information about POJO member for which name is needed, as well as default name that would be used if no custom strategy was used.

  Default (empty) implementation returns suggested ("default") name unmodified.

  Note that the strategy is guaranteed to be called once per logical property (which may be represented by multiple members; such as pair of a getter and a setter), but may be called for each: implementations should not count on exact number of times, and should work for any member that represent a property.

  In absence of a registered custom strategy, default Java property naming strategy is used, which leaves field names as is, and removes set/get/is prefix from methods (as well as lower-cases initial sequence of capitalized characters).

  See Also:
    Serialized Form

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `PropertyNamingStrategy.KebabCaseStrategy` Naming strategy similar to `PropertyNamingStrategy.SnakeCaseStrategy`, but instead of underscores as separators, uses hyphens.
    `static class` | `PropertyNamingStrategy.LowerCaseStrategy` Simple strategy where external name simply only uses lower-case characters, and no separators.
    `static class` | `PropertyNamingStrategy.LowerCaseWithUnderscoresStrategy` Deprecated. In 2.7 use `PropertyNamingStrategy.SnakeCaseStrategy` instead
    `static class` | `PropertyNamingStrategy.PascalCaseStrategy` Deprecated. In 2.7 use `PropertyNamingStrategy.UpperCamelCaseStrategy` instead
    `static class` | `PropertyNamingStrategy.PropertyNamingStrategyBase`
    `static class` | `PropertyNamingStrategy.SnakeCaseStrategy` A `PropertyNamingStrategy` that translates typical camel case Java property names to lower case JSON element names, separated by underscores.
    `static class` | `PropertyNamingStrategy.UpperCamelCaseStrategy` A `PropertyNamingStrategy` that translates typical camelCase Java property names to PascalCase JSON element names (i.e., with a capital first letter).

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static PropertyNamingStrategy` | `CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES` Deprecated. Since 2.7 use `SNAKE_CASE` instead;
    `static PropertyNamingStrategy` | `KEBAB_CASE` Naming convention used in languages like Lisp, where words are in lower-case letters, separated by hyphens.
    `static PropertyNamingStrategy` | `LOWER_CAMEL_CASE` Naming convention used in Java, where words other than first are capitalized and no separator is used between words.
    `static PropertyNamingStrategy` | `LOWER_CASE` Naming convention in which all words of the logical name are in lower case, and no separator is used between words.
    `static PropertyNamingStrategy` | `PASCAL_CASE_TO_CAMEL_CASE` Deprecated. Since 2.7 use `UPPER_CAMEL_CASE` instead;
    `static PropertyNamingStrategy` | `SNAKE_CASE` Naming convention used in languages like C, where words are in lower-case letters, separated by underscores.
    `static PropertyNamingStrategy` | `UPPER_CAMEL_CASE` Naming convention used in languages like Pascal, where words are capitalized and no separator is used between words.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PropertyNamingStrategy()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.lang.String` | `nameForConstructorParameter(MapperConfig<?> config, AnnotatedParameter ctorParam, java.lang.String defaultName)` Method called to find external name (name used in JSON) for given logical POJO property, as defined by given constructor parameter; typically called when building a deserializer (but not necessarily only then).
    `java.lang.String` | `nameForField(MapperConfig<?> config, AnnotatedField field, java.lang.String defaultName)` Method called to find external name (name used in JSON) for given logical POJO property, as defined by given field.
    `java.lang.String` | `nameForGetterMethod(MapperConfig<?> config, AnnotatedMethod method, java.lang.String defaultName)` Method called to find external name (name used in JSON) for given logical POJO property, as defined by given getter method; typically called when building a serializer.
    `java.lang.String` | `nameForSetterMethod(MapperConfig<?> config, AnnotatedMethod method, java.lang.String defaultName)` Method called to find external name (name used in JSON) for given logical POJO property, as defined by given setter method; typically called when building a deserializer (but not necessarily only then).

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### SNAKE_CASE

          public static final PropertyNamingStrategy SNAKE_CASE

      Naming convention used in languages like C, where words are in lower-case letters, separated by underscores. See `PropertyNamingStrategy.SnakeCaseStrategy` for details.
      Since:
        2.7 (was formerly called `CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES`)

    - #### UPPER_CAMEL_CASE

          public static final PropertyNamingStrategy UPPER_CAMEL_CASE

      Naming convention used in languages like Pascal, where words are capitalized and no separator is used between words. See `PropertyNamingStrategy.PascalCaseStrategy` for details.
      Since:
        2.7 (was formerly called `PASCAL_CASE_TO_CAMEL_CASE`)

    - #### LOWER_CAMEL_CASE

          public static final PropertyNamingStrategy LOWER_CAMEL_CASE

      Naming convention used in Java, where words other than first are capitalized and no separator is used between words. Since this is the native Java naming convention, naming strategy will not do any transformation between names in data (JSON) and POJOS.
      Since:
        2.7 (was formerly called `PASCAL_CASE_TO_CAMEL_CASE`)

    - #### LOWER_CASE

          public static final PropertyNamingStrategy LOWER_CASE

      Naming convention in which all words of the logical name are in lower case, and no separator is used between words. See `PropertyNamingStrategy.LowerCaseStrategy` for details.
      Since:
        2.4

    - #### KEBAB_CASE

          public static final PropertyNamingStrategy KEBAB_CASE

      Naming convention used in languages like Lisp, where words are in lower-case letters, separated by hyphens. See `PropertyNamingStrategy.KebabCaseStrategy` for details.
      Since:
        2.7

    - #### CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES

          @Deprecated
          public static final PropertyNamingStrategy CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES

      Deprecated. Since 2.7 use `SNAKE_CASE` instead;

    - #### PASCAL_CASE_TO_CAMEL_CASE

          @Deprecated
          public static final PropertyNamingStrategy PASCAL_CASE_TO_CAMEL_CASE

      Deprecated. Since 2.7 use `UPPER_CAMEL_CASE` instead;

  - ### Constructor Detail

    - #### PropertyNamingStrategy

          public PropertyNamingStrategy()

  - ### Method Detail

    - #### nameForField

          public java.lang.String nameForField(MapperConfig<?> config,
                                      AnnotatedField field,
                                      java.lang.String defaultName)

      Method called to find external name (name used in JSON) for given logical POJO property, as defined by given field.
      Parameters:
        `config` - Configuration in used: either `SerializationConfig` or `DeserializationConfig`, depending on whether method is called during serialization or deserialization
        `field` - Field used to access property
        `defaultName` - Default name that would be used for property in absence of custom strategy
      Returns:
        Logical name to use for property that the field represents

    - #### nameForGetterMethod

          public java.lang.String nameForGetterMethod(MapperConfig<?> config,
                                             AnnotatedMethod method,
                                             java.lang.String defaultName)

      Method called to find external name (name used in JSON) for given logical POJO property, as defined by given getter method; typically called when building a serializer. (but not always -- when using "getter-as-setter", may be called during deserialization)
      Parameters:
        `config` - Configuration in used: either `SerializationConfig` or `DeserializationConfig`, depending on whether method is called during serialization or deserialization
        `method` - Method used to access property.
        `defaultName` - Default name that would be used for property in absence of custom strategy
      Returns:
        Logical name to use for property that the method represents

    - #### nameForSetterMethod

          public java.lang.String nameForSetterMethod(MapperConfig<?> config,
                                             AnnotatedMethod method,
                                             java.lang.String defaultName)

      Method called to find external name (name used in JSON) for given logical POJO property, as defined by given setter method; typically called when building a deserializer (but not necessarily only then).
      Parameters:
        `config` - Configuration in used: either `SerializationConfig` or `DeserializationConfig`, depending on whether method is called during serialization or deserialization
        `method` - Method used to access property.
        `defaultName` - Default name that would be used for property in absence of custom strategy
      Returns:
        Logical name to use for property that the method represents

    - #### nameForConstructorParameter

          public java.lang.String nameForConstructorParameter(MapperConfig<?> config,
                                                     AnnotatedParameter ctorParam,
                                                     java.lang.String defaultName)

      Method called to find external name (name used in JSON) for given logical POJO property, as defined by given constructor parameter; typically called when building a deserializer (but not necessarily only then).
      Parameters:
        `config` - Configuration in used: either `SerializationConfig` or `DeserializationConfig`, depending on whether method is called during serialization or deserialization
        `ctorParam` - Constructor parameter used to pass property.
        `defaultName` - Default name that would be used for property in absence of custom strategy