| /* |
| * 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 java.util.ArrayList; |
| import java.util.Enumeration; |
| import java.util.List; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.openjpa.lib.util.J2DoPrivHelper; |
| import org.apache.openjpa.lib.util.MultiClassLoader; |
| |
| /** |
| * Iterator over a given metadata resource. |
| * |
| * @author Abe White |
| */ |
| public class ResourceMetaDataIterator implements MetaDataIterator { |
| |
| private List<URL> _urls = null; |
| private int _url = -1; |
| |
| /** |
| * Constructor; supply the resource to parse. |
| */ |
| public ResourceMetaDataIterator(String rsrc) throws IOException { |
| this(rsrc, null); |
| } |
| |
| /** |
| * Constructor; supply the resource to parse. |
| */ |
| public ResourceMetaDataIterator(String rsrc, ClassLoader loader) |
| throws IOException { |
| if (loader == null) { |
| MultiClassLoader multi = AccessController |
| .doPrivileged(J2DoPrivHelper.newMultiClassLoaderAction()); |
| multi.addClassLoader(MultiClassLoader.SYSTEM_LOADER); |
| multi.addClassLoader(MultiClassLoader.THREAD_LOADER); |
| multi.addClassLoader(getClass().getClassLoader()); |
| loader = multi; |
| } |
| |
| try { |
| Enumeration<URL> e = AccessController.doPrivileged( |
| J2DoPrivHelper.getResourcesAction(loader, rsrc)); |
| while (e.hasMoreElements()) { |
| if (_urls == null) |
| _urls = new ArrayList<URL>(3); |
| _urls.add(e.nextElement()); |
| } |
| } catch (PrivilegedActionException pae) { |
| throw (IOException) pae.getException(); |
| } |
| } |
| |
| public boolean hasNext() { |
| return _urls != null && _url + 1 < _urls.size(); |
| } |
| |
| public URL next() { |
| if (!hasNext()) |
| throw new NoSuchElementException(); |
| return _urls.get(++_url); |
| } |
| |
| public InputStream getInputStream() throws IOException { |
| if (_url == -1 || _url >= _urls.size()) |
| throw new IllegalStateException(); |
| try { |
| return AccessController.doPrivileged( |
| J2DoPrivHelper.openStreamAction(_urls.get(_url))); |
| } catch (PrivilegedActionException pae) { |
| throw (IOException) pae.getException(); |
| } |
| } |
| |
| public File getFile() throws IOException { |
| if (_url == -1 || _url >= _urls.size()) |
| throw new IllegalStateException(); |
| File file = new File(URLDecoder.decode((_urls.get(_url)).getFile())); |
| return ((AccessController.doPrivileged( |
| J2DoPrivHelper.existsAction(file))).booleanValue()) ? file :null; |
| } |
| |
| public void close() { |
| } |
| } |
| |