| /* |
| * Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.security.jca; |
| |
| import java.util.*; |
| |
| import java.security.*; |
| import java.security.Provider.Service; |
| |
| /** |
| * Collection of utility methods to facilitate implementing getInstance() |
| * methods in the JCA/JCE/JSSE/... framework. |
| * |
| * @author Andreas Sterbenz |
| * @since 1.5 |
| */ |
| public class GetInstance { |
| |
| private GetInstance() { |
| // empty |
| } |
| |
| /** |
| * Static inner class representing a newly created instance. |
| */ |
| public static final class Instance { |
| // public final fields, access directly without accessors |
| public final Provider provider; |
| public final Object impl; |
| private Instance(Provider provider, Object impl) { |
| this.provider = provider; |
| this.impl = impl; |
| } |
| // Return Provider and implementation as an array as used in the |
| // old Security.getImpl() methods. |
| public Object[] toArray() { |
| return new Object[] {impl, provider}; |
| } |
| } |
| |
| public static Service getService(String type, String algorithm) |
| throws NoSuchAlgorithmException { |
| ProviderList list = Providers.getProviderList(); |
| Service s = list.getService(type, algorithm); |
| if (s == null) { |
| throw new NoSuchAlgorithmException |
| (algorithm + " " + type + " not available"); |
| } |
| return s; |
| } |
| |
| public static Service getService(String type, String algorithm, |
| String provider) throws NoSuchAlgorithmException, |
| NoSuchProviderException { |
| if ((provider == null) || (provider.length() == 0)) { |
| throw new IllegalArgumentException("missing provider"); |
| } |
| Provider p = Providers.getProviderList().getProvider(provider); |
| if (p == null) { |
| throw new NoSuchProviderException("no such provider: " + provider); |
| } |
| Service s = p.getService(type, algorithm); |
| if (s == null) { |
| throw new NoSuchAlgorithmException("no such algorithm: " |
| + algorithm + " for provider " + provider); |
| } |
| return s; |
| } |
| |
| public static Service getService(String type, String algorithm, |
| Provider provider) throws NoSuchAlgorithmException { |
| if (provider == null) { |
| throw new IllegalArgumentException("missing provider"); |
| } |
| Service s = provider.getService(type, algorithm); |
| if (s == null) { |
| throw new NoSuchAlgorithmException("no such algorithm: " |
| + algorithm + " for provider " + provider.getName()); |
| } |
| return s; |
| } |
| |
| /** |
| * Return a List of all the available Services that implement |
| * (type, algorithm). Note that the list is initialized lazily |
| * and Provider loading and lookup is only trigered when |
| * necessary. |
| */ |
| public static List<Service> getServices(String type, String algorithm) { |
| ProviderList list = Providers.getProviderList(); |
| return list.getServices(type, algorithm); |
| } |
| |
| /** |
| * This method exists for compatibility with JCE only. It will be removed |
| * once JCE has been changed to use the replacement method. |
| * @deprecated use getServices(List<ServiceId>) instead |
| */ |
| @Deprecated |
| public static List<Service> getServices(String type, |
| List<String> algorithms) { |
| ProviderList list = Providers.getProviderList(); |
| return list.getServices(type, algorithms); |
| } |
| |
| /** |
| * Return a List of all the available Services that implement any of |
| * the specified algorithms. See getServices(String, String) for detals. |
| */ |
| public static List<Service> getServices(List<ServiceId> ids) { |
| ProviderList list = Providers.getProviderList(); |
| return list.getServices(ids); |
| } |
| |
| /* |
| * For all the getInstance() methods below: |
| * @param type the type of engine (e.g. MessageDigest) |
| * @param clazz the Spi class that the implementation must subclass |
| * (e.g. MessageDigestSpi.class) or null if no superclass check |
| * is required |
| * @param algorithm the name of the algorithm (or alias), e.g. MD5 |
| * @param provider the provider (String or Provider object) |
| * @param param the parameter to pass to the Spi constructor |
| * (for CertStores) |
| * |
| * There are overloaded methods for all the permutations. |
| */ |
| |
| public static Instance getInstance(String type, Class clazz, |
| String algorithm) throws NoSuchAlgorithmException { |
| // in the almost all cases, the first service will work |
| // avoid taking long path if so |
| ProviderList list = Providers.getProviderList(); |
| Service firstService = list.getService(type, algorithm); |
| if (firstService == null) { |
| throw new NoSuchAlgorithmException |
| (algorithm + " " + type + " not available"); |
| } |
| NoSuchAlgorithmException failure; |
| try { |
| return getInstance(firstService, clazz); |
| } catch (NoSuchAlgorithmException e) { |
| failure = e; |
| } |
| // if we cannot get the service from the prefered provider, |
| // fail over to the next |
| for (Service s : list.getServices(type, algorithm)) { |
| if (s == firstService) { |
| // do not retry initial failed service |
| continue; |
| } |
| try { |
| return getInstance(s, clazz); |
| } catch (NoSuchAlgorithmException e) { |
| failure = e; |
| } |
| } |
| throw failure; |
| } |
| |
| public static Instance getInstance(String type, Class clazz, |
| String algorithm, Object param) throws NoSuchAlgorithmException { |
| List<Service> services = getServices(type, algorithm); |
| NoSuchAlgorithmException failure = null; |
| for (Service s : services) { |
| try { |
| return getInstance(s, clazz, param); |
| } catch (NoSuchAlgorithmException e) { |
| failure = e; |
| } |
| } |
| if (failure != null) { |
| throw failure; |
| } else { |
| throw new NoSuchAlgorithmException |
| (algorithm + " " + type + " not available"); |
| } |
| } |
| |
| public static Instance getInstance(String type, Class clazz, |
| String algorithm, String provider) throws NoSuchAlgorithmException, |
| NoSuchProviderException { |
| return getInstance(getService(type, algorithm, provider), clazz); |
| } |
| |
| public static Instance getInstance(String type, Class clazz, |
| String algorithm, Object param, String provider) |
| throws NoSuchAlgorithmException, NoSuchProviderException { |
| return getInstance(getService(type, algorithm, provider), clazz, param); |
| } |
| |
| public static Instance getInstance(String type, Class clazz, |
| String algorithm, Provider provider) |
| throws NoSuchAlgorithmException { |
| return getInstance(getService(type, algorithm, provider), clazz); |
| } |
| |
| public static Instance getInstance(String type, Class clazz, |
| String algorithm, Object param, Provider provider) |
| throws NoSuchAlgorithmException { |
| return getInstance(getService(type, algorithm, provider), clazz, param); |
| } |
| |
| /* |
| * The two getInstance() methods below take a service. They are |
| * intended for classes that cannot use the standard methods, e.g. |
| * because they implement delayed provider selection like the |
| * Signature class. |
| */ |
| |
| public static Instance getInstance(Service s, Class clazz) |
| throws NoSuchAlgorithmException { |
| Object instance = s.newInstance(null); |
| checkSuperClass(s, instance.getClass(), clazz); |
| return new Instance(s.getProvider(), instance); |
| } |
| |
| public static Instance getInstance(Service s, Class clazz, |
| Object param) throws NoSuchAlgorithmException { |
| Object instance = s.newInstance(param); |
| checkSuperClass(s, instance.getClass(), clazz); |
| return new Instance(s.getProvider(), instance); |
| } |
| |
| /** |
| * Check is subClass is a subclass of superClass. If not, |
| * throw a NoSuchAlgorithmException. |
| */ |
| public static void checkSuperClass(Service s, Class subClass, |
| Class superClass) throws NoSuchAlgorithmException { |
| if (superClass == null) { |
| return; |
| } |
| if (superClass.isAssignableFrom(subClass) == false) { |
| throw new NoSuchAlgorithmException |
| ("class configured for " + s.getType() + ": " |
| + s.getClassName() + " not a " + s.getType()); |
| } |
| } |
| |
| } |