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    • se.bjurr.violations.lib.util.Absent Maven / Gradle / Ivy

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    package se.bjurr.violations.lib.util;

import java.util.Collections;
import java.util.Set;

final class Absent extends Optional {
  static final Absent INSTANCE = new Absent<>();

  private static final long serialVersionUID = 0;

  @SuppressWarnings("unchecked") // implementation is "fully variant"
  static  Optional withType() {
    return (Optional) INSTANCE;
  }

  private Absent() {}

  @Override
  public Set asSet() {
    return Collections.emptySet();
  }

  @Override
  public boolean equals(Object object) {
    return object == this;
  }

  @Override
  public T get() {
    throw new IllegalStateException("Optional.get() cannot be called on an absent value");
  }

  @Override
  public int hashCode() {
    return 0x79a31aac;
  }

  @Override
  public boolean isPresent() {
    return false;
  }

  @Override
  public T or(T defaultValue) {
    return Utils.checkNotNull(defaultValue, "use Optional.orNull() instead of Optional.or(null)");
  }

  @Override
  public T orNull() {
    return null;
  }

  private Object readResolve() {
    return INSTANCE;
  }

  @Override
  public String toString() {
    return "Optional.absent()";
  }
}
    
    
    
    

    




    
    
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