java/idea-ui/src/com/intellij/openapi/roots/ui/configuration/LibrariesAlphaComparator.java

   1 /*
   2  * Copyright 2000-2009 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.openapi.roots.ui.configuration;
  17
  18 import com.intellij.openapi.roots.OrderRootType;
  19 import com.intellij.openapi.roots.libraries.Library;
  20 import com.intellij.openapi.vfs.VirtualFile;
  21
  22 import java.util.Comparator;
  23
  24 /**
  25  * @author Eugene Zhuravlev
  26  *         Date: Jan 14, 2004
  27  */
  28 public class LibrariesAlphaComparator implements Comparator<Library> {
  29   public static LibrariesAlphaComparator INSTANCE = new LibrariesAlphaComparator();
  30
  31   public int compare(Library library1, Library library2) {
  32     String name1 = library1.getName();
  33     if (name1 != null && name1.length() == 0) {
  34       name1 = null;
  35     }
  36     String name2 = library2.getName();
  37     if (name2 != null && name2.length() == 0) {
  38       name2 = null;
  39     }
  40     if (name1 == null && name2 == null) {
  41       final VirtualFile[] files1 = library1.getFiles(OrderRootType.CLASSES);
  42       final VirtualFile[] files2 = library2.getFiles(OrderRootType.CLASSES);
  43       name1 = files1.length > 0? files1[0].getName() : null;
  44       name2 = files2.length > 0? files2[0].getName() : null;
  45     }
  46     return compareNames(name1, name2);
  47   }
  48
  49   public int compareNames(String name1, String name2) {
  50     if (name1 == null && name2 == null) {
  51       return 0;
  52     }
  53     else if (name1 == null) {
  54       return -1;
  55     }
  56     else if (name2 == null) {
  57       return +1;
  58     }
  59     else {
  60       return name1.compareToIgnoreCase(name2);
  61     }
  62   }
  63 }