com.fasterxml.jackson.databind.deser

## Class DataFormatReaders

- java.lang.Object
- - com.fasterxml.jackson.databind.deser.DataFormatReaders

-     public class DataFormatReaders
      extends Object

  Alternative to `DataFormatDetector` that needs to be used when using data-binding.
  Since:
    2.1

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected class` | `DataFormatReaders.AccessorForReader` We need sub-class here as well, to be able to access efficiently.
    `static class` | `DataFormatReaders.Match` Result class, similar to `DataFormatMatcher`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected int` | `_maxInputLookahead` Maximum number of leading bytes of the input that we can read to determine data format.
    `protected MatchStrength` | `_minimalMatch` Strength of minimal match we accept as the answer, unless better matches are found.
    `protected MatchStrength` | `_optimalMatch` Strength of match we consider to be good enough to be used without checking any other formats.
    `protected ObjectReader[]` | `_readers` Ordered list of readers which both represent data formats to detect (in precedence order, starting with highest) and contain factories used for actual detection.
    `static int` | `DEFAULT_MAX_INPUT_LOOKAHEAD` By default we will look ahead at most 64 bytes; in most cases, much less (4 bytes or so) is needed, but we will allow bit more leniency to support data formats that need more complex heuristics.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `DataFormatReaders(Collection<ObjectReader> detectors)`
    `DataFormatReaders(ObjectReader... detectors)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `DataFormatReaders.Match` | `findFormat(byte[] fullInputData)` Method to call to find format that given content (full document) has, as per configuration of this detector instance.
    `DataFormatReaders.Match` | `findFormat(byte[] fullInputData, int offset, int len)` Method to call to find format that given content (full document) has, as per configuration of this detector instance.
    `DataFormatReaders.Match` | `findFormat(InputStream in)` Method to call to find format that content (accessible via given `InputStream`) given has, as per configuration of this detector instance.
    `String` | `toString()`
    `DataFormatReaders` | `with(DeserializationConfig config)`
    `DataFormatReaders` | `with(ObjectReader[] readers)`
    `DataFormatReaders` | `withMaxInputLookahead(int lookaheadBytes)`
    `DataFormatReaders` | `withMinimalMatch(MatchStrength minMatch)`
    `DataFormatReaders` | `withOptimalMatch(MatchStrength optMatch)`
    `DataFormatReaders` | `withType(JavaType type)`

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

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

- - ### Field Detail

    - #### DEFAULT_MAX_INPUT_LOOKAHEAD

          public static final int DEFAULT_MAX_INPUT_LOOKAHEAD

      By default we will look ahead at most 64 bytes; in most cases, much less (4 bytes or so) is needed, but we will allow bit more leniency to support data formats that need more complex heuristics.
      See Also:
        Constant Field Values

    - #### _readers

          protected final ObjectReader[] _readers

      Ordered list of readers which both represent data formats to detect (in precedence order, starting with highest) and contain factories used for actual detection.

    - #### _optimalMatch

          protected final MatchStrength _optimalMatch

      Strength of match we consider to be good enough to be used without checking any other formats. Default value is `MatchStrength.SOLID_MATCH`,

    - #### _minimalMatch

          protected final MatchStrength _minimalMatch

      Strength of minimal match we accept as the answer, unless better matches are found. Default value is `MatchStrength.WEAK_MATCH`,

    - #### _maxInputLookahead

          protected final int _maxInputLookahead

      Maximum number of leading bytes of the input that we can read to determine data format.

      Default value is `DEFAULT_MAX_INPUT_LOOKAHEAD`.

  - ### Constructor Detail

    - #### DataFormatReaders

          public DataFormatReaders(ObjectReader... detectors)

    - #### DataFormatReaders

          public DataFormatReaders(Collection<ObjectReader> detectors)

  - ### Method Detail

    - #### withOptimalMatch

          public DataFormatReaders withOptimalMatch(MatchStrength optMatch)

    - #### withMinimalMatch

          public DataFormatReaders withMinimalMatch(MatchStrength minMatch)

    - #### with

          public DataFormatReaders with(ObjectReader[] readers)

    - #### withMaxInputLookahead

          public DataFormatReaders withMaxInputLookahead(int lookaheadBytes)

    - #### with

          public DataFormatReaders with(DeserializationConfig config)

    - #### withType

          public DataFormatReaders withType(JavaType type)

    - #### findFormat

          public DataFormatReaders.Match findFormat(InputStream in)
                                             throws IOException

      Method to call to find format that content (accessible via given `InputStream`) given has, as per configuration of this detector instance.
      Returns:
        Matcher object which contains result; never null, even in cases where no match (with specified minimal match strength) is found.
      Throws:
        `IOException`

    - #### findFormat

          public DataFormatReaders.Match findFormat(byte[] fullInputData)
                                             throws IOException

      Method to call to find format that given content (full document) has, as per configuration of this detector instance.
      Returns:
        Matcher object which contains result; never null, even in cases where no match (with specified minimal match strength) is found.
      Throws:
        `IOException`

    - #### findFormat

          public DataFormatReaders.Match findFormat(byte[] fullInputData,
                                                    int offset,
                                                    int len)
                                             throws IOException

      Method to call to find format that given content (full document) has, as per configuration of this detector instance.
      Returns:
        Matcher object which contains result; never null, even in cases where no match (with specified minimal match strength) is found.
      Throws:
        `IOException`
      Since:
        2.1

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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