| /* |
| * Copyright 2000-2009 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.openapi.diagnostic.Logger; |
| import com.intellij.util.ArrayUtil; |
| import gnu.trove.TObjectHashingStrategy; |
| import gnu.trove.TObjectIntHashMap; |
| import gnu.trove.TObjectIntIterator; |
| |
| /** |
| * @author dyoma |
| */ |
| public class Enumerator<T> { |
| private static final Logger LOG = Logger.getInstance("#com.intellij.util.containers.Enumerator"); |
| private final TObjectIntHashMap<T> myNumbers; |
| private int myNextNumber = 1; |
| |
| public Enumerator(int expectNumber, TObjectHashingStrategy<T> strategy) { |
| myNumbers = new TObjectIntHashMap<T>(expectNumber, strategy); |
| } |
| |
| public void clear() { |
| myNumbers.clear(); |
| myNextNumber = 1; |
| } |
| |
| public int[] enumerate(T[] objects) { |
| return enumerate(objects, 0, 0); |
| } |
| |
| public int[] enumerate(T[] objects, final int startShift, final int endCut) { |
| int[] idx = ArrayUtil.newIntArray(objects.length - startShift - endCut); |
| for (int i = startShift; i < (objects.length - endCut); i++) { |
| final T object = objects[i]; |
| final int number = enumerate(object); |
| idx[i - startShift] = number; |
| } |
| return idx; |
| } |
| |
| public int enumerate(T object) { |
| final int res = enumerateImpl(object); |
| return Math.max(res, -res); |
| } |
| |
| public boolean add(T object) { |
| final int res = enumerateImpl(object); |
| return res < 0; |
| } |
| |
| public int enumerateImpl(T object) { |
| if( object == null ) return 0; |
| |
| int number = myNumbers.get(object); |
| if (number == 0) { |
| number = myNextNumber++; |
| myNumbers.put(object, number); |
| return -number; |
| } |
| return number; |
| } |
| |
| public int get(T object) { |
| if (object == null) return 0; |
| final int res = myNumbers.get(object); |
| |
| if (res == 0) |
| LOG.error( "Object "+ object + " must be already added to enumerator!" ); |
| |
| return res; |
| } |
| |
| public String toString() { |
| StringBuffer buffer = new StringBuffer(); |
| for( TObjectIntIterator<T> iter = myNumbers.iterator(); iter.hasNext(); ) { |
| iter.advance(); |
| buffer.append(Integer.toString(iter.value()) + ": " + iter.key().toString() + "\n"); |
| } |
| return buffer.toString(); |
| } |
| } |