mirror of git://gcc.gnu.org/git/gcc.git
102 lines
3.3 KiB
Java
102 lines
3.3 KiB
Java
/* SignatureFactory.java --
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Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.security.sig;
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import gnu.java.security.Registry;
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import gnu.java.security.sig.dss.DSSSignature;
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import gnu.java.security.sig.rsa.RSASignatureFactory;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Set;
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/**
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* A Factory to instantiate signature-with-appendix handlers.
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*/
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public class SignatureFactory
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{
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private static Set names;
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/** Trivial constructor to enforce Singleton pattern. */
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private SignatureFactory()
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{
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super();
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}
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/**
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* Returns an instance of a signature-with-appendix scheme given its name.
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*
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* @param ssa the case-insensitive signature-with-appendix scheme name.
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* @return an instance of the scheme, or <code>null</code> if none found.
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*/
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public static final ISignature getInstance(String ssa)
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{
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if (ssa == null)
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return null;
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ssa = ssa.trim();
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ssa = ssa.toLowerCase();
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ISignature result = null;
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if (ssa.equalsIgnoreCase(Registry.DSA_SIG) || ssa.equals(Registry.DSS_SIG))
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result = new DSSSignature();
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else if (ssa.startsWith(Registry.RSA_SIG_PREFIX))
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result = RSASignatureFactory.getInstance(ssa);
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return result;
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}
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/**
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* Returns a {@link Set} of signature-with-appendix scheme names supported by
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* this <i>Factory</i>.
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*
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* @return a {@link Set} of signature-with-appendix scheme names (Strings).
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*/
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public static synchronized final Set getNames()
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{
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if (names == null)
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{
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HashSet hs = new HashSet();
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hs.add(Registry.DSS_SIG);
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hs.addAll(RSASignatureFactory.getNames());
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names = Collections.unmodifiableSet(hs);
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}
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return names;
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}
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}
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