| /* |
| * 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.deployment.rp.autoconf; |
| |
| import java.io.File; |
| import java.io.FileFilter; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class PersistencyManager |
| { |
| private static final FileFilter FILES_ONLY_FILTER = new FileFilter() |
| { |
| public boolean accept(File pathname) |
| { |
| return pathname.isFile(); |
| } |
| }; |
| |
| private final File m_root; |
| |
| public PersistencyManager(File root) |
| { |
| m_root = root; |
| } |
| |
| /** |
| * Deletes a resource. |
| * |
| * @param name Name of the resource. |
| * @throws IOException If the resource could not be deleted. |
| */ |
| public void delete(String name) throws IOException |
| { |
| name = name.replace('/', File.separatorChar); |
| File target = new File(m_root, name); |
| if (target.exists() && !target.delete()) |
| { |
| throw new IOException("Unable to delete file: " + target.getAbsolutePath()); |
| } |
| while (target.getParentFile().list().length == 0 && !target.getParentFile().getAbsolutePath().equals(m_root.getAbsolutePath())) |
| { |
| target = target.getParentFile(); |
| target.delete(); |
| } |
| } |
| |
| /** |
| * Returns the names of all persisted resources. |
| * @return a list of resource names, never <code>null</code>. |
| */ |
| public List<String> getResourceNames() |
| { |
| List<String> result = new ArrayList<String>(); |
| |
| File[] list = m_root.listFiles(FILES_ONLY_FILTER); |
| if (list != null && list.length > 0) |
| { |
| for (File resource : list) |
| { |
| result.add(resource.getName()); |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Loads a stored resource. |
| * |
| * @param name Name of the resource. |
| * @return List of <code>AutoConfResource</code>s representing the specified resource, if the resource is unknown an empty list is returned. |
| * @throws IOException If the resource could not be properly read. |
| */ |
| public List<AutoConfResource> load(String name) throws IOException |
| { |
| List<AutoConfResource> resources = new ArrayList<AutoConfResource>(); |
| name = name.replace('/', File.separatorChar); |
| File resourcesFile = new File(m_root, name); |
| if (!resourcesFile.exists()) |
| { |
| return resources; |
| } |
| |
| ObjectInputStream in = null; |
| try |
| { |
| in = new ObjectInputStream(new FileInputStream(resourcesFile)); |
| resources = (List<AutoConfResource>) in.readObject(); |
| } |
| catch (FileNotFoundException e) |
| { |
| throw new IOException("Resource does not exist: " + name); |
| } |
| catch (ClassNotFoundException e) |
| { |
| throw new IOException("Unable to recreate persisted object from file: " + name); |
| } |
| finally |
| { |
| if (in != null) |
| { |
| try |
| { |
| in.close(); |
| } |
| catch (Exception e) |
| { |
| // not much we can do |
| } |
| } |
| } |
| return resources; |
| } |
| |
| /** |
| * Stores a resource. |
| * |
| * @param name Name of the resource. |
| * @param configs List of <code>AutoConfResource</code>s representing the specified resource. |
| * @throws IOException If the resource could not be stored. |
| */ |
| public void store(String name, List<AutoConfResource> configs) throws IOException |
| { |
| File targetDir = m_root; |
| name = name.replace('/', File.separatorChar); |
| |
| if (name.startsWith(File.separator)) |
| { |
| name = name.substring(1); |
| } |
| int lastSeparator = name.lastIndexOf(File.separator); |
| File target = null; |
| if (lastSeparator != -1) |
| { |
| targetDir = new File(targetDir, name.substring(0, lastSeparator)); |
| targetDir.mkdirs(); |
| } |
| target = new File(targetDir, name.substring(lastSeparator + 1)); |
| |
| ObjectOutputStream out = null; |
| try |
| { |
| out = new ObjectOutputStream(new FileOutputStream(target)); |
| out.writeObject(configs); |
| } |
| finally |
| { |
| if (out != null) |
| { |
| try |
| { |
| out.close(); |
| } |
| catch (Exception e) |
| { |
| // not much we can do |
| } |
| } |
| } |
| } |
| } |