platform-api/src/com/intellij/ui/treeStructure/WeightBasedComparator.java

   1 /*
   2  * Copyright 2000-2007 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.ui.treeStructure;
  17
  18 import com.intellij.ide.util.treeView.NodeDescriptor;
  19
  20 import java.util.Comparator;
  21
  22 public class WeightBasedComparator implements Comparator<NodeDescriptor> {
  23
  24   private boolean myCompareToString;
  25
  26   public static final WeightBasedComparator INSTANCE = new WeightBasedComparator();
  27
  28   public WeightBasedComparator() {
  29     this(false);
  30   }
  31
  32   public WeightBasedComparator(final boolean compareToString) {
  33     myCompareToString = compareToString;
  34   }
  35
  36   public int compare(NodeDescriptor o1, NodeDescriptor o2) {
  37     SimpleNode first = (SimpleNode) o1;
  38     SimpleNode second = (SimpleNode) o2;
  39
  40     if (myCompareToString && first.getWeight() == second.getWeight()) {
  41       String s1 = first.toString();
  42       String s2 = second.toString();
  43       if (s1 == null) return s2 == null ? 0 : -1;
  44       if (s2 == null) return +1;
  45       return s1.compareToIgnoreCase(s2);
  46     }
  47     return first.getWeight() - second.getWeight();
  48   }
  49 }