| /* |
| * 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.felix.connect; |
| |
| import java.io.BufferedInputStream; |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.Closeable; |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.List; |
| import java.util.jar.JarEntry; |
| import java.util.jar.JarFile; |
| import java.util.jar.JarInputStream; |
| import java.lang.ref.WeakReference; |
| |
| class URLRevision implements Revision |
| { |
| private final URL m_url; |
| private final long m_lastModified; |
| private WeakReference<byte[]> m_urlContent; |
| |
| public URLRevision(URL url, long lastModified) |
| { |
| m_url = url; |
| if (lastModified > 0) |
| { |
| m_lastModified = lastModified; |
| } |
| else |
| { |
| m_lastModified = System.currentTimeMillis(); |
| } |
| } |
| |
| @Override |
| public long getLastModified() |
| { |
| return m_lastModified; |
| } |
| |
| @Override |
| public Enumeration<String> getEntries() |
| { |
| InputStream content = null; |
| JarInputStream jarInput = null; |
| |
| try |
| { |
| content = getUrlContent(); |
| jarInput = new JarInputStream(content); |
| List<String> entries = new ArrayList<String>(); |
| JarEntry jarEntry; |
| |
| while ((jarEntry = jarInput.getNextJarEntry()) != null) |
| { |
| entries.add(jarEntry.getName()); |
| } |
| return Collections.enumeration(entries); |
| } |
| |
| catch (IOException e) |
| { |
| e.printStackTrace(); |
| return Collections.enumeration(Collections.EMPTY_LIST); |
| } |
| |
| finally |
| { |
| close(content); |
| close(jarInput); |
| } |
| } |
| |
| @Override |
| public URL getEntry(String entryName) |
| { |
| try |
| { |
| return new URL(m_url, entryName); |
| } |
| catch (MalformedURLException e) |
| { |
| // TODO Auto-generated catch block |
| e.printStackTrace(); |
| return null; |
| } |
| } |
| |
| /** |
| * Loads the URL content, and cache it using a weak reference. |
| * |
| * @return the URL content |
| * @throws IOException on any io errors |
| */ |
| private synchronized InputStream getUrlContent() throws IOException { |
| BufferedInputStream in = null; |
| ByteArrayOutputStream out = null; |
| byte[] content = null; |
| |
| try |
| { |
| if (m_urlContent == null || (content = m_urlContent.get()) == null) |
| { |
| out = new ByteArrayOutputStream(4096); |
| in = new BufferedInputStream(m_url.openStream(), 4096); |
| int c; |
| while ((c = in.read()) != -1) |
| { |
| out.write(c); |
| } |
| content = out.toByteArray(); |
| m_urlContent = new WeakReference<byte[]>(content); |
| } |
| |
| return new ByteArrayInputStream(content); |
| } |
| |
| finally |
| { |
| close(out); |
| close(in); |
| } |
| } |
| |
| /** |
| * Helper method used to simply close a stream. |
| * |
| * @param closeable the stream to close |
| */ |
| private void close(Closeable closeable) |
| { |
| try |
| { |
| if (closeable != null) |
| { |
| closeable.close(); |
| } |
| } |
| catch (IOException e) |
| { |
| } |
| } |
| } |