com.ibm.wala.util.intset.EmptyIntSet Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of com.ibm.wala.util Show documentation

T. J. Watson Libraries for Analysis

The newest version!

/*
 * Copyright (c) 2011 - IBM Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 */
package com.ibm.wala.util.intset;

import java.util.NoSuchElementException;

public class EmptyIntSet implements IntSet {

  private static final long serialVersionUID = 5116475799916663164L;
  public static EmptyIntSet instance = new EmptyIntSet();

  @Override
  public boolean contains(int i) {
    return false;
  }

  @Override
  public boolean containsAny(IntSet set) {
    return false;
  }

  @Override
  public IntSet intersection(IntSet that) {
    return this;
  }

  @Override
  public IntSet union(IntSet that) {
    return that;
  }

  @Override
  public boolean isEmpty() {
    return true;
  }

  @Override
  public int size() {
    return 0;
  }

  private static final IntIterator emptyIter =
      new IntIterator() {

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

        @Override
        public int next() {
          throw new NoSuchElementException();
        }
      };

  @Override
  public IntIterator intIterator() {
    return emptyIter;
  }

  @Override
  public void foreach(IntSetAction action) {}

  @Override
  public void foreachExcluding(IntSet X, IntSetAction action) {}

  @Override
  public int max() {
    throw new NoSuchElementException();
  }

  @Override
  public boolean sameValue(IntSet that) {
    return that.isEmpty();
  }

  @Override
  public boolean isSubset(IntSet that) {
    return true;
  }
}