java/java-impl/src/com/intellij/openapi/roots/libraries/LibrariesHelperImpl.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.libraries;
  17
  18 import com.intellij.openapi.roots.OrderRootType;
  19 import com.intellij.openapi.vfs.JarFileSystem;
  20 import com.intellij.openapi.vfs.VirtualFile;
  21 import com.intellij.openapi.vfs.VirtualFileManager;
  22 import com.intellij.util.text.StringTokenizer;
  23 import org.jetbrains.annotations.NonNls;
  24
  25 /**
  26  * author: lesya
  27  */
  28 public class LibrariesHelperImpl extends LibrariesHelper {
  29
  30   @Override
  31   public VirtualFile findJarByClass(Library library, @NonNls String fqn) {
  32     return library == null ? null : findJarByClass(library.getFiles(OrderRootType.CLASSES), fqn);
  33   }
  34
  35   private VirtualFile findJarByClass(VirtualFile[] files, String fqn) {
  36     for (VirtualFile file : files) {
  37       if (findInFile(file, new StringTokenizer(fqn, "."))) return file;
  38     }
  39     return null;
  40   }
  41
  42   public boolean isClassAvailableInLibrary(Library library, String fqn) {
  43     final String[] urls = library.getUrls(OrderRootType.CLASSES);
  44     return isClassAvailable(urls, fqn);
  45   }
  46
  47   public boolean isClassAvailable(final String[] urls, String fqn) {
  48     for (String url : urls) {
  49       VirtualFile file = VirtualFileManager.getInstance().findFileByUrl(url);
  50       if (file == null) continue;
  51       if (!(file.getFileSystem() instanceof JarFileSystem) && !file.isDirectory()) {
  52         file = JarFileSystem.getInstance().findFileByPath(file.getPath() + JarFileSystem.JAR_SEPARATOR);
  53       }
  54       if (file == null) continue;
  55       if (findInFile(file, new StringTokenizer(fqn, "."))) return true;
  56     }
  57     return false;
  58   }
  59
  60   private static boolean findInFile(VirtualFile root, final StringTokenizer filePath) {
  61     if (!filePath.hasMoreTokens()) return true;
  62     @NonNls String name = filePath.nextToken();
  63     if (!filePath.hasMoreTokens()) {
  64       name += ".class";
  65     }
  66     final VirtualFile child = root.findChild(name);
  67     return child != null && findInFile(child, filePath);
  68   }
  69
  70 }