87             if (!attrs.isRegularFile())
  88                 throw new UnsupportedOperationException();
  89             return true;
  90         } catch (IOException ioe) {
  91             return false;
  92         }
  93     }
  94 
  95     @Override
  96     public FileSystem newFileSystem(URI uri, Map<String, ?> env)
  97         throws IOException
  98     {
  99         Path path = uriToPath(uri);
 100         synchronized(filesystems) {
 101             Path realPath = null;
 102             if (ensureFile(path)) {
 103                 realPath = path.toRealPath();
 104                 if (filesystems.containsKey(realPath))
 105                     throw new FileSystemAlreadyExistsException();
 106             }
 107             ZipFileSystem zipfs = null;
 108             try {
 109                 if (env.containsKey("multi-release")) {
 110                     zipfs = new JarFileSystem(this, path, env);
 111                 } else {
 112                     zipfs = new ZipFileSystem(this, path, env);
 113                 }
 114             } catch (ZipException ze) {
 115                 String pname = path.toString();
 116                 if (pname.endsWith(".zip") || pname.endsWith(".jar"))
 117                     throw ze;
 118                 // assume NOT a zip/jar file
 119                 throw new UnsupportedOperationException();
 120             }
 121             if (realPath == null) {  // newly created
 122                 realPath = path.toRealPath();
 123             }
 124             filesystems.put(realPath, zipfs);
 125             return zipfs;
 126         }
 127     }

  87             if (!attrs.isRegularFile())
  88                 throw new UnsupportedOperationException();
  89             return true;
  90         } catch (IOException ioe) {
  91             return false;
  92         }
  93     }
  94 
  95     @Override
  96     public FileSystem newFileSystem(URI uri, Map<String, ?> env)
  97         throws IOException
  98     {
  99         Path path = uriToPath(uri);
 100         synchronized(filesystems) {
 101             Path realPath = null;
 102             if (ensureFile(path)) {
 103                 realPath = path.toRealPath();
 104                 if (filesystems.containsKey(realPath))
 105                     throw new FileSystemAlreadyExistsException();
 106             }
 107             ZipFileSystem zipfs;
 108             try {
 109                 if (env.containsKey("multi-release")) {
 110                     zipfs = new JarFileSystem(this, path, env);
 111                 } else {
 112                     zipfs = new ZipFileSystem(this, path, env);
 113                 }
 114             } catch (ZipException ze) {
 115                 String pname = path.toString();
 116                 if (pname.endsWith(".zip") || pname.endsWith(".jar"))
 117                     throw ze;
 118                 // assume NOT a zip/jar file
 119                 throw new UnsupportedOperationException();
 120             }
 121             if (realPath == null) {  // newly created
 122                 realPath = path.toRealPath();
 123             }
 124             filesystems.put(realPath, zipfs);
 125             return zipfs;
 126         }
 127     }