| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.openjpa.lib.meta; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| import java.net.URLDecoder; |
| import java.security.AccessController; |
| import java.security.PrivilegedActionException; |
| |
| import org.apache.openjpa.lib.util.J2DoPrivHelper; |
| |
| /** |
| * Iterator over the metadata resource represented by a URL. |
| * |
| * @author Abe White |
| */ |
| public class URLMetaDataIterator implements MetaDataIterator { |
| |
| private final URL _url; |
| private boolean _iterated = false; |
| |
| /** |
| * Constructor; supply resource URL. |
| */ |
| public URLMetaDataIterator(URL url) { |
| _url = url; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return _url != null && !_iterated; |
| } |
| |
| @Override |
| public URL next() throws IOException { |
| if (!hasNext()) |
| throw new IllegalStateException(); |
| |
| _iterated = true; |
| return _url; |
| } |
| |
| @Override |
| public InputStream getInputStream() throws IOException { |
| if (!_iterated) |
| throw new IllegalStateException(); |
| if (_url == null) |
| return null; |
| try { |
| return AccessController.doPrivileged( |
| J2DoPrivHelper.openStreamAction(_url)); |
| } catch (PrivilegedActionException pae) { |
| throw (IOException) pae.getException(); |
| } |
| } |
| |
| @Override |
| public File getFile() { |
| if (!_iterated) |
| throw new IllegalStateException(); |
| if (_url == null) |
| return null; |
| File file = new File(URLDecoder.decode(_url.getPath())); |
| return ((AccessController.doPrivileged( |
| J2DoPrivHelper.existsAction(file))).booleanValue()) ? file:null; |
| } |
| |
| @Override |
| public void close() { |
| } |
| } |
| |