Package io.permazen.encoding

Class DoubleEncoding

java.lang.Object
io.permazen.encoding.AbstractEncoding<T>
io.permazen.encoding.PrimitiveEncoding<T>
io.permazen.encoding.NumberEncoding<Double>
io.permazen.encoding.DoubleEncoding
All Implemented Interfaces:
Encoding<Double>, NaturalSortAware, Serializable, Comparator<Double>
public class DoubleEncoding extends NumberEncoding<Double>
Double type.
See Also:

  • Constructor Details

    • DoubleEncoding

      public DoubleEncoding(EncodingId encodingId)

  • Method Details

    • read

      public Double read(ByteData.Reader reader)
      Description copied from interface: Encoding
      Read a value from the given input.
      Parameters:
      reader - byte input
      Returns:
      decoded value (possibly null)

    • write

      public void write(ByteData.Writer writer, Double value)
      Description copied from interface: Encoding
      Write a value to the given output.
      Parameters:
      writer - byte output
      value - value to write (possibly null)

    • skip

      public void skip(ByteData.Reader reader)
      Description copied from interface: Encoding
      Read and discard an encoded value from the given input.

      If the value skipped over is invalid, this method may, but is not required to, throw IllegalArgumentException.

      If the value skipped over is truncated, this method must throw IndexOutOfBoundsException.

      Parameters:
      reader - byte input

    • validate

      public Double validate(Object obj)
      Description copied from interface: Encoding
      Verify the given object is a valid instance of this Encoding's Java type and cast it to that type.

      Note that this method must throw IllegalArgumentException, not ClassCastException or NullPointerException, if obj does not have the correct type, or is an unsupported value - including null if null is not supported.

      This method is allowed to perform widening conversions of the object that lose no information, e.g., from Integer to Long.

      The implementation in Encoding first verifies the value is not null if this instance does not allow null values, and then attempts to cast the value using this instance's raw Java type. Subclasses should override this method to implement any other restrictions.

      Specified by:
      validate in interface Encoding<Double>
      Overrides:
      validate in class PrimitiveEncoding<Double>
      Parameters:
      obj - object to validate
      Returns:
      obj cast to this encoding's type

    • hasPrefix0x00

      public boolean hasPrefix0x00()
      Description copied from interface: Encoding
      Determine whether any of this encoding's encoded values start with a 0x00 byte. Certain optimizations are possible when this is not the case. It is safe for this method to always return true.

      Note: changing the result of this method may result in an incompatible encoding if this encoding is wrapped in another class.

      Returns:
      true if an encoded value starting with 0x00 exists

    • hasPrefix0xff

      public boolean hasPrefix0xff()
      Description copied from interface: Encoding
      Determine whether any of this encoding's encoded values start with a 0xff byte. Certain optimizations are possible when this is not the case. It is safe for this method to always return true.

      Note: changing the result of this method may result in an incompatible encoding if this encoding is wrapped in another class.

      Returns:
      true if an encoded value starting with 0xff exists

    • getFixedWidth

      public OptionalInt getFixedWidth()
      Description copied from interface: Encoding
      Get the fixed width of this encoding, if any.

      Some encodings encode every value into the same number of bytes. For such encodings, this method returns that number. For variable width encodings, this method must return empty.

      Returns:
      the number of bytes of every encoded value, or empty if the encoding length varies

    • convertNumber

      protected Double convertNumber(Number value)
      Specified by:
      convertNumber in class PrimitiveEncoding<Double>