| /* |
| * 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.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.security.AccessController; |
| import java.security.PrivilegedActionException; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.openjpa.lib.util.J2DoPrivHelper; |
| import org.apache.openjpa.lib.util.Localizer; |
| |
| /** |
| * Iterator over a file, or over all metadata resources below a given directory. |
| * |
| * @author Abe White |
| */ |
| public class FileMetaDataIterator implements MetaDataIterator { |
| |
| private static final long SCAN_LIMIT = 100000; |
| |
| private static final Localizer _loc = Localizer.forPackage |
| (FileMetaDataIterator.class); |
| |
| private final Iterator<File> _itr; |
| private File _file = null; |
| |
| /** |
| * Constructor; supply metadata file. |
| */ |
| public FileMetaDataIterator(File file) { |
| _itr = Collections.singleton(file).iterator(); |
| } |
| |
| /** |
| * Constructor; supply root of directory tree to search and optional |
| * file filter. |
| */ |
| public FileMetaDataIterator(File dir, MetaDataFilter filter) |
| throws IOException { |
| if (dir == null) |
| _itr = null; |
| else { |
| Collection<File> metas = new ArrayList<>(); |
| FileResource rsrc = (filter == null) ? null : new FileResource(); |
| scan(dir, filter, rsrc, metas, 0); |
| _itr = metas.iterator(); |
| } |
| } |
| |
| /** |
| * Scan all files below the given one for metadata files, adding them |
| * to the given collection. |
| */ |
| private int scan(File file, MetaDataFilter filter, FileResource rsrc, |
| Collection<File> metas, int scanned) throws IOException { |
| if (scanned > SCAN_LIMIT) |
| throw new IllegalStateException(_loc.get("too-many-files", |
| String.valueOf(SCAN_LIMIT)).getMessage()); |
| scanned++; |
| |
| if (filter == null) |
| metas.add(file); |
| else { |
| rsrc.setFile(file); |
| if (filter.matches(rsrc)) |
| metas.add(file); |
| else { |
| File[] files = (File[]) AccessController |
| .doPrivileged(J2DoPrivHelper.listFilesAction(file)); |
| if (files != null) |
| for (int i = 0; i < files.length; i++) |
| scanned = scan(files[i], filter, rsrc, metas, scanned); |
| } |
| } |
| return scanned; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return _itr != null && _itr.hasNext(); |
| } |
| |
| @Override |
| public URL next() throws IOException { |
| if (_itr == null) |
| throw new NoSuchElementException(); |
| |
| _file = _itr.next(); |
| try { |
| File f = AccessController.doPrivileged(J2DoPrivHelper |
| .getAbsoluteFileAction(_file)); |
| return AccessController.doPrivileged( |
| J2DoPrivHelper.toURLAction(f)); |
| } catch (PrivilegedActionException pae) { |
| throw (MalformedURLException) pae.getException(); |
| } |
| } |
| |
| @Override |
| public InputStream getInputStream() throws IOException { |
| if (_file == null) |
| throw new IllegalStateException(); |
| FileInputStream fis = null; |
| try { |
| fis = AccessController.doPrivileged( |
| J2DoPrivHelper.newFileInputStreamAction(_file)); |
| return fis; |
| } catch (PrivilegedActionException pae) { |
| throw (FileNotFoundException) pae.getException(); |
| } |
| } |
| |
| @Override |
| public File getFile() { |
| if (_file == null) |
| throw new IllegalStateException(); |
| return _file; |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| private static class FileResource implements MetaDataFilter.Resource { |
| |
| private File _file = null; |
| |
| public void setFile(File file) { |
| _file = file; |
| } |
| |
| @Override |
| public String getName() { |
| return _file.getName(); |
| } |
| |
| @Override |
| public byte[] getContent() throws IOException { |
| long len = AccessController.doPrivileged( |
| J2DoPrivHelper.lengthAction(_file)); |
| FileInputStream fin = null; |
| try { |
| fin = AccessController.doPrivileged( |
| J2DoPrivHelper.newFileInputStreamAction(_file)); |
| } catch (PrivilegedActionException pae) { |
| throw (FileNotFoundException) pae.getException(); |
| } |
| try { |
| byte[] content; |
| if (len <= 0 || len > Integer.MAX_VALUE) { |
| // some JVMs don't return a proper length |
| ByteArrayOutputStream bout = new ByteArrayOutputStream(); |
| byte[] buf = new byte[1024]; |
| for (int r; (r = fin.read(buf)) != -1;) |
| bout.write(buf, 0, r); |
| content = bout.toByteArray(); |
| } else { |
| content = new byte[(int) len]; |
| for (int r, o = 0; o < content.length && (r = fin. |
| read(content, o, content.length - o)) != -1; o += r); |
| } |
| return content; |
| } finally { |
| try { fin.close(); } catch (IOException ioe) {} |
| } |
| } |
| } |
| } |