com.fasterxml.jackson.core

## Enum StreamReadCapability

- java.lang.Object
- - java.lang.Enum<StreamReadCapability>
  - - com.fasterxml.jackson.core.StreamReadCapability

- All Implemented Interfaces:
    JacksonFeature, Serializable, Comparable<StreamReadCapability>

      public enum StreamReadCapability
      extends Enum<StreamReadCapability>
      implements JacksonFeature

  Set of on/off capabilities that a `JsonParser` for given format (or in case of buffering, original format) has. Used in some cases to adjust aspects of things like content conversions, coercions and validation by format-agnostic functionality. Specific or expected usage documented by individual capability entry Javadocs.
  Since:
    2.12

- - ### Enum Constant Summary

    Enum Constants
    Enum Constant and Description
    `DUPLICATE_PROPERTIES` Capability that indicates that data format can expose multiple properties with same name ("duplicates") within one Object context.
    `SCALARS_AS_OBJECTS` Capability that indicates that data format may in some cases expose Scalar values (whether typed or untyped) as Object values.
    `UNTYPED_SCALARS` Capability that indicates that data format only exposed "untyped" scalars: that is, instead of Number, Boolean and String types all scalar values are reported as text (`JsonToken.VALUE_STRING`) unless some sort of coercion is implied by caller.

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `enabledByDefault()` Accessor for checking whether this feature is enabled by default.
    `boolean` | `enabledIn(int flags)` Convenience method for checking whether feature is enabled in given bitmask.
    `int` | `getMask()` Returns bit mask for this feature instance; must be a single bit, that is of form `1 << N`.
    `static StreamReadCapability` | `valueOf(String name)` Returns the enum constant of this type with the specified name.
    `static StreamReadCapability[]` | `values()` Returns an array containing the constants of this enum type, in the order they are declared.

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

      `clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

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

      `getClass, notify, notifyAll, wait, wait, wait`

- - ### Enum Constant Detail

    - #### DUPLICATE_PROPERTIES

          public static final StreamReadCapability DUPLICATE_PROPERTIES

      Capability that indicates that data format can expose multiple properties with same name ("duplicates") within one Object context. This is usually not enabled, except for formats like `xml` that have content model that does not map cleanly to JSON-based token stream.

      Capability may be used for allowing secondary mapping of such duplicates in case of using Tree Model (see `TreeNode`), or "untyped" databinding (mapping content as generic `Object`).

      Capability is currently only enabled for XML format backend.

    - #### SCALARS_AS_OBJECTS

          public static final StreamReadCapability SCALARS_AS_OBJECTS

      Capability that indicates that data format may in some cases expose Scalar values (whether typed or untyped) as Object values. There are additional access methods at databind level: this capability may be used to decide whether to attempt to use such methods especially in potentially ambiguous cases.

      Capability is currently only enabled for XML format backend.

    - #### UNTYPED_SCALARS

          public static final StreamReadCapability UNTYPED_SCALARS

      Capability that indicates that data format only exposed "untyped" scalars: that is, instead of Number, Boolean and String types all scalar values are reported as text (`JsonToken.VALUE_STRING`) unless some sort of coercion is implied by caller.

      This capability is true for many textual formats like CSV, Properties and XML.

  - ### Method Detail

    - #### values

          public static StreamReadCapability[] values()

      Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

          for (StreamReadCapability c : StreamReadCapability.values())
              System.out.println(c);

      Returns:
        an array containing the constants of this enum type, in the order they are declared

    - #### valueOf

          public static StreamReadCapability valueOf(String name)

      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
        `name` - the name of the enum constant to be returned.
      Returns:
        the enum constant with the specified name
      Throws:
        `IllegalArgumentException` - if this enum type has no constant with the specified name
        `NullPointerException` - if the argument is null

    - #### enabledByDefault

          public boolean enabledByDefault()

      Description copied from interface: `JacksonFeature`
      Accessor for checking whether this feature is enabled by default.
      Specified by:
        `enabledByDefault` in interface `JacksonFeature`
      Returns:
        Whether this instance is enabled by default or not

    - #### enabledIn

          public boolean enabledIn(int flags)

      Description copied from interface: `JacksonFeature`
      Convenience method for checking whether feature is enabled in given bitmask.
      Specified by:
        `enabledIn` in interface `JacksonFeature`
      Parameters:
        `flags` - Bit field that contains a set of enabled features of this type
      Returns:
        True if this feature is enabled in passed bit field

    - #### getMask

          public int getMask()

      Description copied from interface: `JacksonFeature`
      Returns bit mask for this feature instance; must be a single bit, that is of form `1 << N`.
      Specified by:
        `getMask` in interface `JacksonFeature`
      Returns:
        Bit mask of this feature

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