ImmutableSet.java

package org.klojang.collections;

import java.util.Collection;
import java.util.Set;
import java.util.function.Predicate;

abstract sealed class ImmutableSet<E> implements Set<E> permits ArraySet,
    AbstractTypeSet {

  @Override
  public boolean add(E e) {
    throw new UnsupportedOperationException();
  }

  @Override
  public boolean remove(Object o) {
    throw new UnsupportedOperationException();
  }

  @Override
  public boolean addAll(Collection<? extends E> c) {
    throw new UnsupportedOperationException();
  }

  @Override
  public boolean retainAll(Collection<?> c) {
    throw new UnsupportedOperationException();
  }

  @Override
  public boolean removeAll(Collection<?> c) {
    throw new UnsupportedOperationException();
  }

  @Override
  public void clear() {
    throw new UnsupportedOperationException();

  }

  @Override
  public boolean removeIf(Predicate<? super E> filter) {
    throw new UnsupportedOperationException();
  }

}