Package com.launchdarkly.sdk

Class LDValue.Converter<T>

java.lang.Object
com.launchdarkly.sdk.LDValue.Converter<T>
Type Parameters:
T - the type to convert from/to
Enclosing class:
LDValue
public abstract static class LDValue.Converter<T> extends Object
Defines a conversion between LDValue and some other type.

Besides converting individual values, this provides factory methods like arrayOf(T...) which transform a collection of the specified type to the corresponding LDValue complex type.

  • Constructor Details

    • Converter

      public Converter()

  • Method Details

    • fromType

      public abstract LDValue fromType(T value)
      Converts a value of the specified type to an LDValue.

      This method should never throw an exception; if for some reason the value is invalid, it should return LDValue.ofNull().

      Parameters:
      value - a value of this type
      Returns:
      an LDValue

    • toType

      public abstract T toType(LDValue value)
      Converts an LDValue to a value of the specified type.

      This method should never throw an exception; if the conversion cannot be done, it should return the default value of the given type (zero for numbers, null for nullable types).

      Parameters:
      value - an LDValue
      Returns:
      a value of this type

    • arrayFrom

      public LDValue arrayFrom(Iterable<T> values)
      Initializes an LDValue as an array, from a sequence of this type.

      Values are copied, so subsequent changes to the source values do not affect the array.

      Example: 

      
     List<Integer> listOfInts = ImmutableList.<Integer>builder().add(1).add(2).add(3).build();
     LDValue arrayValue = LDValue.Convert.Integer.arrayFrom(listOfInts);
      Parameters:
      values - a sequence of elements of the specified type
      Returns:
      a value representing a JSON array, or LDValue.ofNull() if the parameter was null
      See Also:

    • arrayOf

      public LDValue arrayOf(T... values)
      Initializes an LDValue as an array, from a sequence of this type.

      Values are copied, so subsequent changes to the source values do not affect the array.

      Example: 

      
     LDValue arrayValue = LDValue.Convert.Integer.arrayOf(1, 2, 3);
      Parameters:
      values - a sequence of elements of the specified type
      Returns:
      a value representing a JSON array, or LDValue.ofNull() if the parameter was null
      See Also:

    • objectFrom

      public LDValue objectFrom(Map<String,T> map)
      Initializes an LDValue as an object, from a map containing this type.

      Values are copied, so subsequent changes to the source map do not affect the array.

      Example: 

      
     Map<String, Integer> mapOfInts = ImmutableMap.<String, Integer>builder().put("a", 1).build();
     LDValue objectValue = LDValue.Convert.Integer.objectFrom(mapOfInts);
      Parameters:
      map - a map with string keys and values of the specified type
      Returns:
      a value representing a JSON object, or LDValue.ofNull() if the parameter was null
      See Also: