text: /*
   * Copyright (C) 2013 Red Hat, Inc. and/or its affiliates.
   *
   * 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 org.jboss.errai.common.metadata;
  
  import com.google.common.collect.AbstractIterator;
  import org.jboss.errai.reflections.vfs.Vfs;
  import org.jboss.vfs.VirtualFile;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * Implementation of {@link Vfs.Dir} to support JBoss VFS for proper classpath scanning on JBoss AS.
   *
   * @author Mike Brock <cbrock@redhat.com>
   * @author Jonathan Fuerth <jfuerth@redhat.com>
   */
  public class JBossVfsDir implements Vfs.Dir {
    private VirtualFile virtualFile;
  
    public JBossVfsDir(URL url) {
      try {
        Object content = url.getContent();
        if (content instanceof VirtualFile) {
          virtualFile = (VirtualFile) content;
        }
        else {
          throw new IllegalArgumentException(
              "URL content is not a JBoss VFS VirtualFile. Type is: " +
                  (content == null ? "null" : content.getClass().getName()));
        }
      }
      catch (IOException e) {
        throw new RuntimeException("could not instantiate VFS directory", e);
      }
    }
  
    @Override
    public String getPath() {
      return virtualFile.getPathName();
    }
  
    @Override
    public Iterable<Vfs.File> getFiles() {
      return new Iterable<Vfs.File>() {
        @Override
        public Iterator<Vfs.File> iterator() {
          final List<VirtualFile> toVisit = new ArrayList<VirtualFile>(virtualFile.getChildren());
  
          return new AbstractIterator<Vfs.File>() {
  
            @Override
            protected Vfs.File computeNext() {
              while (!toVisit.isEmpty()) {
                final VirtualFile nextFile = toVisit.remove(toVisit.size() - 1);
                if (nextFile.isDirectory()) {
                  toVisit.addAll(nextFile.getChildren());
                  continue;
                }
                return new Vfs.File() {
                  @Override
                  public String getName() {
                    return nextFile.getName();
                  }
  
                  @Override
                  public String getRelativePath() {
                    return nextFile.getPathName();
                  }
  
                  @Override
                  public String getFullPath() {
                    return nextFile.getPathName();
                  }
  
                  @Override
                  public InputStream openInputStream() throws IOException {
                    return nextFile.openStream();
                  }
                };
              }
              return endOfData();
            }
          };
        }
      };
    }
  
    @Override
    public void close() {
    }
  }
  