| /* |
| * 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.URL; |
| import java.net.URLConnection; |
| import java.security.AccessController; |
| import java.security.PrivilegedActionException; |
| import java.util.Enumeration; |
| import java.util.NoSuchElementException; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipFile; |
| |
| import org.apache.openjpa.lib.util.J2DoPrivHelper; |
| |
| /** |
| * Iterator over all metadata resources in a given zip file. |
| * |
| * @author Abe White |
| */ |
| public class ZipFileMetaDataIterator |
| implements MetaDataIterator, MetaDataFilter.Resource { |
| |
| private final ZipFile _file; |
| private final MetaDataFilter _filter; |
| private final Enumeration<? extends ZipEntry> _entries; |
| private ZipEntry _entry = null; |
| private ZipEntry _last = null; |
| |
| /** |
| * Constructor; supply zip/jar URL and optional file filter. |
| */ |
| public ZipFileMetaDataIterator(URL url, MetaDataFilter filter) |
| throws IOException { |
| if (url == null) { |
| _file = null; |
| } else { |
| URLConnection con = url.openConnection(); |
| con.setDefaultUseCaches(false); |
| try { |
| _file = (ZipFile) AccessController.doPrivileged( |
| J2DoPrivHelper.getContentAction(con)); |
| } catch (PrivilegedActionException pae) { |
| throw (IOException) pae.getException(); |
| } |
| } |
| _filter = filter; |
| _entries = (_file == null) ? null : _file.entries(); |
| } |
| |
| /** |
| * Constructor; supply zip file and optional file filter. |
| */ |
| public ZipFileMetaDataIterator(ZipFile file, MetaDataFilter filter) { |
| _file = file; |
| _filter = filter; |
| _entries = (file == null) ? null : file.entries(); |
| } |
| |
| @Override |
| public boolean hasNext() throws IOException { |
| if (_entries == null) |
| return false; |
| |
| // search for next metadata file |
| while (_entry == null && _entries.hasMoreElements()) { |
| _entry = _entries.nextElement(); |
| if (_filter != null && !_filter.matches(this)) |
| _entry = null; |
| } |
| return _entry != null; |
| } |
| |
| @Override |
| public String next() throws IOException { |
| if (!hasNext()) |
| throw new NoSuchElementException(); |
| String ret = _entry.getName(); |
| _last = _entry; |
| _entry = null; |
| return ret; |
| } |
| |
| @Override |
| public InputStream getInputStream() throws IOException { |
| if (_last == null) |
| throw new IllegalStateException(); |
| return _file.getInputStream(_last); |
| } |
| |
| @Override |
| public File getFile() { |
| if (_last == null) |
| throw new IllegalStateException(); |
| return null; |
| } |
| |
| @Override |
| public void close() { |
| try { |
| if (_file != null) |
| _file.close(); |
| } catch (IOException ioe) { |
| } |
| } |
| |
| ////////////////////////////////////////// |
| // MetaDataFilter.Resource implementation |
| ////////////////////////////////////////// |
| |
| @Override |
| public String getName() { |
| return _entry.getName(); |
| } |
| |
| @Override |
| public byte[] getContent() throws IOException { |
| long size = _entry.getSize(); |
| if (size == 0) |
| return new byte[0]; |
| |
| InputStream in = _file.getInputStream(_entry); |
| 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; |
| } |
| } |
| |