/*
* Copyright (c) 2000, 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.provider.certpath;
import java.security.InvalidAlgorithmParameterException;
import java.security.cert.Certificate;
import java.security.cert.CRL;
import java.util.Collection;
import java.util.ConcurrentModificationException;
import java.util.HashSet;
import java.util.Iterator;
import java.security.cert.CertSelector;
import java.security.cert.CertStore;
import java.security.cert.CertStoreException;
import java.security.cert.CertStoreParameters;
import java.security.cert.CollectionCertStoreParameters;
import java.security.cert.CRLSelector;
import java.security.cert.CertStoreSpi;
/**
* A <code>CertStore</code> that retrieves <code>Certificates</code> and
* <code>CRL</code>s from a <code>Collection</code>.
* <p>
* Before calling the {@link #engineGetCertificates engineGetCertificates} or
* {@link #engineGetCRLs engineGetCRLs} methods, the
* {@link #CollectionCertStore(CertStoreParameters)
* CollectionCertStore(CertStoreParameters)} constructor is called to
* create the <code>CertStore</code> and establish the
* <code>Collection</code> from which <code>Certificate</code>s and
* <code>CRL</code>s will be retrieved. If the specified
* <code>Collection</code> contains an object that is not a
* <code>Certificate</code> or <code>CRL</code>, that object will be
* ignored.
* <p>
* <b>Concurrent Access</b>
* <p>
* As described in the javadoc for <code>CertStoreSpi</code>, the
* <code>engineGetCertificates</code> and <code>engineGetCRLs</code> methods
* must be thread-safe. That is, multiple threads may concurrently
* invoke these methods on a single <code>CollectionCertStore</code>
* object (or more than one) with no ill effects.
* <p>
* This is achieved by requiring that the <code>Collection</code> passed to
* the {@link #CollectionCertStore(CertStoreParameters)
* CollectionCertStore(CertStoreParameters)} constructor (via the
* <code>CollectionCertStoreParameters</code> object) must have fail-fast
* iterators. Simultaneous modifications to the <code>Collection</code> can thus be
* detected and certificate or CRL retrieval can be retried. The fact that
* <code>Certificate</code>s and <code>CRL</code>s must be thread-safe is also
* essential.
*
* @see java.security.cert.CertStore
*
* @since 1.4
* @author Steve Hanna
*/
public class CollectionCertStore extends CertStoreSpi {
private Collection<?> coll;
/**
* Creates a <code>CertStore</code> with the specified parameters.
* For this class, the parameters object must be an instance of
* <code>CollectionCertStoreParameters</code>. The <code>Collection</code>
* included in the <code>CollectionCertStoreParameters</code> object
* must be thread-safe.
*
* @param params the algorithm parameters
* @exception InvalidAlgorithmParameterException if params is not an
* instance of <code>CollectionCertStoreParameters</code>
*/
public CollectionCertStore(CertStoreParameters params)
throws InvalidAlgorithmParameterException
{
super(params);
if (!(params instanceof CollectionCertStoreParameters))
throw new InvalidAlgorithmParameterException(
"parameters must be CollectionCertStoreParameters");
coll = ((CollectionCertStoreParameters) params).getCollection();
}
/**
* Returns a <code>Collection</code> of <code>Certificate</code>s that
* match the specified selector. If no <code>Certificate</code>s
* match the selector, an empty <code>Collection</code> will be returned.
*
* @param selector a <code>CertSelector</code> used to select which
* <code>Certificate</code>s should be returned. Specify <code>null</code>
* to return all <code>Certificate</code>s.
* @return a <code>Collection</code> of <code>Certificate</code>s that
* match the specified selector
* @throws CertStoreException if an exception occurs
*/
public Collection<Certificate> engineGetCertificates
(CertSelector selector) throws CertStoreException {
if (coll == null) {
throw new CertStoreException("Collection is null");
}
// Tolerate a few ConcurrentModificationExceptions
for (int c = 0; c < 10; c++) {
try {
HashSet<Certificate> result = new HashSet<Certificate>();
Iterator<?> i = coll.iterator();
if (selector != null) {
while (i.hasNext()) {
Object o = i.next();
if ((o instanceof Certificate) &&
selector.match((Certificate) o))
result.add((Certificate)o);
}
} else {
while (i.hasNext()) {
Object o = i.next();
if (o instanceof Certificate)
result.add((Certificate)o);
}
}
return(result);
} catch (ConcurrentModificationException e) { }
}
throw new ConcurrentModificationException("Too many "
+ "ConcurrentModificationExceptions");
}
/**
* Returns a <code>Collection</code> of <code>CRL</code>s that
* match the specified selector. If no <code>CRL</code>s
* match the selector, an empty <code>Collection</code> will be returned.
*
* @param selector a <code>CRLSelector</code> used to select which
* <code>CRL</code>s should be returned. Specify <code>null</code>
* to return all <code>CRL</code>s.
* @return a <code>Collection</code> of <code>CRL</code>s that
* match the specified selector
* @throws CertStoreException if an exception occurs
*/
public Collection<CRL> engineGetCRLs(CRLSelector selector)
throws CertStoreException
{
if (coll == null)
throw new CertStoreException("Collection is null");
// Tolerate a few ConcurrentModificationExceptions
for (int c = 0; c < 10; c++) {
try {
HashSet<CRL> result = new HashSet<CRL>();
Iterator<?> i = coll.iterator();
if (selector != null) {
while (i.hasNext()) {
Object o = i.next();
if ((o instanceof CRL) && selector.match((CRL) o))
result.add((CRL)o);
}
} else {
while (i.hasNext()) {
Object o = i.next();
if (o instanceof CRL)
result.add((CRL)o);
}
}
return(result);
} catch (ConcurrentModificationException e) { }
}
throw new ConcurrentModificationException("Too many "
+ "ConcurrentModificationExceptions");
}
}