| /* |
| * Copyright 2000-2014 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.intellij.util.containers; |
| |
| import com.intellij.util.ArrayUtil; |
| import com.intellij.util.IncorrectOperationException; |
| import gnu.trove.TIntHashSet; |
| import gnu.trove.TIntIterator; |
| import gnu.trove.TIntProcedure; |
| |
| import java.util.NoSuchElementException; |
| |
| public class EmptyIntHashSet extends TIntHashSet { |
| public static final TIntHashSet INSTANCE = new EmptyIntHashSet(); |
| public static final TIntIterator EMPTY_INT_ITERATOR = new TIntIterator(INSTANCE) { |
| @Override |
| public int next() { |
| throw new NoSuchElementException(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return false; |
| } |
| |
| @Override |
| public void remove() { |
| throw new NoSuchElementException(); |
| } |
| }; |
| |
| private EmptyIntHashSet() { |
| super(0); |
| } |
| |
| @Override |
| public boolean add(int val) { |
| throw new IncorrectOperationException(); |
| } |
| |
| @Override |
| public int[] toArray() { |
| return ArrayUtil.EMPTY_INT_ARRAY; |
| } |
| |
| @Override |
| public TIntIterator iterator() { |
| return EMPTY_INT_ITERATOR; |
| } |
| |
| @Override |
| public void clear() { |
| throw new IncorrectOperationException(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return 0; |
| } |
| |
| @Override |
| public boolean remove(int val) { |
| throw new IncorrectOperationException(); |
| } |
| |
| @Override |
| public boolean containsAll(int[] array) { |
| return false; |
| } |
| |
| @Override |
| public boolean addAll(int[] array) { |
| throw new IncorrectOperationException(); |
| } |
| |
| @Override |
| public boolean removeAll(int[] array) { |
| throw new IncorrectOperationException(); |
| } |
| |
| @Override |
| public boolean retainAll(int[] array) { |
| throw new IncorrectOperationException(); |
| } |
| |
| @Override |
| public boolean contains(int val) { |
| return false; |
| } |
| |
| @Override |
| public boolean forEach(TIntProcedure procedure) { |
| return true; |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return true; |
| } |
| |
| @Override |
| public int size() { |
| return 0; |
| } |
| |
| @Override |
| public void compact() { |
| throw new IncorrectOperationException(); |
| } |
| |
| @Override |
| public String toString() { |
| return "Empty Int Hash Set"; |
| } |
| } |