Class DefaultEquator<T>

java.lang.Object
org.apache.commons.collections4.functors.DefaultEquator<T>
Type Parameters:
T - the types of object this Equator can evaluate.
All Implemented Interfaces:
Serializable, Equator<T>

public class DefaultEquator<T> extends Object implements Equator<T>, Serializable
Default Equator implementation.
Since:
4.0
See Also:
  • Field Details

    • serialVersionUID

      private static final long serialVersionUID
      Serial version UID
      See Also:
    • INSTANCE

      public static final DefaultEquator INSTANCE
      Static instance
    • HASHCODE_NULL

      public static final int HASHCODE_NULL
      Hashcode used for null objects.
      See Also:
  • Constructor Details

    • DefaultEquator

      private DefaultEquator()
      Restricted constructor.
  • Method Details

    • defaultEquator

      public static <T> DefaultEquator<T> defaultEquator()
      Factory returning the typed singleton instance.
      Type Parameters:
      T - the object type
      Returns:
      the singleton instance
    • equate

      public boolean equate(T o1, T o2)
      Evaluates the two arguments for their equality. Delegates to Object.equals(Object).
      Specified by:
      equate in interface Equator<T>
      Parameters:
      o1 - the first object to be equated.
      o2 - the second object to be equated.
      Returns:
      whether the two objects are equal.
    • hash

      public int hash(T o)
      Calculates the hash for the object, based on the method of equality used in the equate method. This is used for classes that delegate their equals(Object) method to an Equator (and so must also delegate their hashCode() method), or for implementations of HashedMap that use an Equator for the key objects.
      Specified by:
      hash in interface Equator<T>
      Parameters:
      o - the object to calculate the hash for.
      Returns:
      o.hashCode() if o is non- null, else HASHCODE_NULL.
    • readResolve

      private Object readResolve()