Package org.apache.flink.cep.nfa

Class DeweyNumber

java.lang.Object
org.apache.flink.cep.nfa.DeweyNumber
All Implemented Interfaces:
Serializable
public class DeweyNumber extends Object implements Serializable
Versioning scheme which allows to retrieve dependencies between different versions.

A dewey number consists of a sequence of digits d1.d2.d3. ... .dn. A dewey number v is compatible to v' iff v contains v' as a prefix or if both dewey number differ only in the last digit and the last digit of v is greater than v'.

See Also:

  • Constructor Details

    • DeweyNumber

      public DeweyNumber(int start)

    • DeweyNumber

      public DeweyNumber(DeweyNumber number)

  • Method Details

    • isCompatibleWith

      public boolean isCompatibleWith(DeweyNumber other)
      Checks whether this dewey number is compatible to the other dewey number.

      True iff this contains other as a prefix or iff they differ only in the last digit whereas the last digit of this is greater than the last digit of other.

      Parameters:
      other - The other dewey number to check compatibility against
      Returns:
      Whether this dewey number is compatible to the other dewey number

    • getRun

      public int getRun()

    • length

      public int length()

    • increase

      public DeweyNumber increase()
      Creates a new dewey number from this such that its last digit is increased by one.
      Returns:
      A new dewey number derived from this whose last digit is increased by one

    • increase

      public DeweyNumber increase(int times)
      Creates a new dewey number from this such that its last digit is increased by the supplied number.
      Parameters:
      times - how many times to increase the Dewey number
      Returns:
      A new dewey number derived from this whose last digit is increased by given number

    • addStage

      public DeweyNumber addStage()
      Creates a new dewey number from this such that a 0 is appended as new last digit.
      Returns:
      A new dewey number which contains this as a prefix and has 0 as last digit

    • equals

      public boolean equals(Object obj)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • fromString

      public static DeweyNumber fromString(String deweyNumberString)
      Creates a dewey number from a string representation. The input string must be a dot separated string of integers.
      Parameters:
      deweyNumberString - Dot separated string of integers
      Returns:
      Dewey number generated from the given input string