Method keyEquivalence

corpus/java/training/guava/collect/MapMaker.java:122–129

Sets a custom Equivalence strategy for comparing keys. By default, the map uses Equivalence#identity to determine key equality when #weakKeys is specified, and Equivalence#equals() otherwise. The only place this is used is in Interners.WeakInterner.

(Equivalence<Object> equivalence)

   * is used is in {@link Interners.WeakInterner}.
   */
  @CanIgnoreReturnValue
  @GwtIncompatible // To be supported
  MapMaker keyEquivalence(Equivalence<Object> equivalence) {
    checkState(keyEquivalence == null, "key equivalence was already set to %s", keyEquivalence);
    keyEquivalence = checkNotNull(equivalence);
    this.useCustomMap = true;
    return this;
  }

  Equivalence<Object> getKeyEquivalence() {
    return MoreObjects.firstNonNull(keyEquivalence, getKeyStrength().defaultEquivalence());