| /* |
| * 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.commons.vfs2.util; |
| |
| /** |
| * Factory to create an instance of a Cryptor. |
| * @since 2.0 |
| */ |
| public final class CryptorFactory |
| { |
| /** |
| * The System property name to identify the Cryptor class to be used. |
| */ |
| public static final String CRYPTOR_CLASS = "org.apache.commons.vfs2.cryptor"; |
| |
| private static Cryptor instance; |
| |
| /** |
| * Prevent instantiation of the class. |
| */ |
| private CryptorFactory() |
| { |
| |
| } |
| |
| /** |
| * Allows the Cryptor class to be set programmatically. |
| * @param cryptor The Cryptor. |
| */ |
| public static synchronized void setCryptor(final Cryptor cryptor) |
| { |
| instance = cryptor; |
| } |
| |
| /** |
| * Return the Cryptor. If one has not been previously set, create it. The Cryptor class |
| * can be set by setting the "org.apache.commons.vfs2.cryptor" System property to the |
| * name of the Cryptor class. |
| * @return The Cryptor. |
| */ |
| public static synchronized Cryptor getCryptor() |
| { |
| if (instance != null) |
| { |
| return instance; |
| } |
| |
| final String cryptorClass = System.getProperty(CRYPTOR_CLASS); |
| if (cryptorClass != null) |
| { |
| try |
| { |
| final Class<?> clazz = Class.forName(cryptorClass); |
| instance = (Cryptor) clazz.newInstance(); |
| return instance; |
| } |
| catch (final Exception ex) |
| { |
| throw new RuntimeException("Unable to create Cryptor " + cryptorClass, ex); |
| } |
| } |
| instance = new DefaultCryptor(); |
| return instance; |
| } |
| } |