| /* |
| * Copyright 2000-2011 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.openapi.vcs.checkin; |
| |
| import com.intellij.openapi.util.TextRange; |
| import com.intellij.util.containers.Convertor; |
| |
| import java.util.Collections; |
| import java.util.Comparator; |
| import java.util.List; |
| |
| /** |
| * @author irengrig |
| * Date: 2/21/11 |
| * Time: 12:05 PM |
| * if T and S are compared by convertion to Z, we can find where some t should be placed in s list |
| * |
| */ |
| public class HackSearch<T,S,Z> { |
| private final Convertor<T,Z> myTZConvertor; |
| private final Convertor<S,Z> mySZConvertor; |
| private final Comparator<Z> myZComparator; |
| private S myFake; |
| private Z myFakeConverted; |
| private final Comparator<S> myComparator; |
| |
| public HackSearch(Convertor<T, Z> TZConvertor, Convertor<S, Z> SZConvertor, Comparator<Z> zComparator) { |
| myTZConvertor = TZConvertor; |
| mySZConvertor = SZConvertor; |
| myZComparator = zComparator; |
| myComparator = new Comparator<S>() { |
| @Override |
| public int compare(S o1, S o2) { |
| Z z1 = mySZConvertor.convert(o1); |
| Z z2 = mySZConvertor.convert(o2); |
| if (o1 == myFake) { |
| z1 = myFakeConverted; |
| } else if (o2 == myFake) { |
| z2 = myFakeConverted; |
| } |
| return myZComparator.compare(z1, z2); |
| } |
| }; |
| } |
| |
| public int search(final List<S> list, final T item) { |
| if (list.isEmpty()) return 0; |
| myFake = list.get(0); |
| myFakeConverted = myTZConvertor.convert(item); |
| if (myZComparator.compare(mySZConvertor.convert(myFake), myTZConvertor.convert(item)) >= 0) { |
| return 0; |
| } |
| |
| final int idx = Collections.binarySearch(list.subList(1, list.size()), myFake, myComparator); |
| if (idx >= 0) { |
| return 1 + idx; |
| } else { |
| return - idx; |
| } |
| } |
| } |