| /* |
| * 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.ByteArrayOutputStream; |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.JarURLConnection; |
| import java.net.URL; |
| import java.security.AccessController; |
| import java.security.PrivilegedActionException; |
| import java.util.ArrayList; |
| import java.util.Enumeration; |
| import java.util.NoSuchElementException; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| |
| import org.apache.openjpa.lib.util.J2DoPrivHelper; |
| |
| /** |
| * Iterator over all metadata resources in a given resource addressed by a jar:file URL. |
| * |
| */ |
| public class JarFileURLMetaDataIterator implements MetaDataIterator, MetaDataFilter.Resource { |
| private final MetaDataFilter _filter; |
| private final JarFile _jarFile; |
| private final JarEntry _jarTargetEntry; |
| |
| private int index = 0; |
| private JarEntry _last = null; |
| private final ArrayList<JarEntry> _entryList = new ArrayList<>(); |
| |
| public JarFileURLMetaDataIterator(URL url, MetaDataFilter filter) throws IOException { |
| if (url == null) { |
| _jarFile = null; |
| _jarTargetEntry = null; |
| } else { |
| JarURLConnection jarURLConn = (JarURLConnection) url.openConnection(); |
| jarURLConn.setDefaultUseCaches(false); |
| |
| try { |
| _jarFile = AccessController.doPrivileged(J2DoPrivHelper.getJarFileAction(jarURLConn)); |
| _jarTargetEntry = AccessController.doPrivileged(J2DoPrivHelper.getJarEntryAction(jarURLConn)); |
| |
| if (_jarTargetEntry.isDirectory()) { |
| Enumeration<JarEntry> jarEntryEnum = _jarFile.entries(); |
| while (jarEntryEnum.hasMoreElements()) { |
| JarEntry jarEntry = jarEntryEnum.nextElement(); |
| if (jarEntry.getName().startsWith(_jarTargetEntry.getName())) { |
| _entryList.add(jarEntry); |
| } |
| } |
| } else { |
| _entryList.add(_jarTargetEntry); |
| } |
| } catch (PrivilegedActionException pae) { |
| throw (IOException) pae.getException(); |
| } |
| } |
| |
| _filter = filter; |
| } |
| |
| /** |
| * Return whether there is another resource to iterate over. |
| */ |
| @Override |
| public boolean hasNext() throws IOException { |
| if (_entryList.size() <= index) { |
| return false; |
| } |
| |
| // Search for next metadata file |
| while (index < _entryList.size()) { |
| if (_filter != null && !_filter.matches(this)) { |
| index++; |
| continue; |
| } |
| break; |
| } |
| |
| return (index < _entryList.size()); |
| } |
| |
| /** |
| * Return the next metadata resource. |
| */ |
| @Override |
| public Object next() throws IOException { |
| if (!hasNext()) { |
| throw new NoSuchElementException(); |
| } |
| |
| String ret = _entryList.get(index).getName(); |
| _last = _entryList.get(index); |
| index++; |
| |
| return ret; |
| } |
| |
| /** |
| * Return the last-iterated metadata resource content as a stream. |
| */ |
| @Override |
| public InputStream getInputStream() throws IOException { |
| if (_last == null) |
| throw new IllegalStateException(); |
| return _jarFile.getInputStream(_last); |
| } |
| |
| /** |
| * Return the last-iterated metadata resource content as a file, or null if not an extant file. |
| */ |
| @Override |
| public File getFile() throws IOException { |
| if (_last == null) |
| throw new IllegalStateException(); |
| return null; |
| } |
| |
| /** |
| * Close the resources used by this iterator. |
| */ |
| @Override |
| public void close() { |
| try { |
| if (_jarFile != null) |
| _jarFile.close(); |
| } catch (IOException ioe) { |
| } |
| } |
| |
| // //////////////////////////////////////// |
| // MetaDataFilter.Resource implementation |
| // //////////////////////////////////////// |
| |
| /** |
| * The name of the resource. |
| */ |
| @Override |
| public String getName() { |
| if (index < _entryList.size()) { |
| return _entryList.get(index).getName(); |
| } else { |
| return null; |
| } |
| } |
| |
| /** |
| * Resource content. |
| */ |
| @Override |
| public byte[] getContent() throws IOException { |
| if (_entryList.size() <= index) { |
| return new byte[0]; |
| } |
| |
| long size = _entryList.get(index).getSize(); |
| if (size == 0) |
| return new byte[0]; |
| |
| InputStream in = _jarFile.getInputStream(_entryList.get(index)); |
| byte[] content; |
| if (size < 0) { |
| ByteArrayOutputStream bout = new ByteArrayOutputStream(); |
| byte[] buf = new byte[1024]; |
| for (int r; (r = in.read(buf)) != -1; bout.write(buf, 0, r)) |
| ; |
| content = bout.toByteArray(); |
| } else { |
| content = new byte[(int) size]; |
| int offset = 0; |
| int read; |
| while (offset < size && (read = in.read(content, offset, (int) size - offset)) != -1) { |
| offset += read; |
| } |
| } |
| in.close(); |
| return content; |
| } |
| } |