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	/*
	* Copyright (c) 2000, 2013, 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 java.security.cert;

	import java.security.AccessController;
	import java.security.InvalidAlgorithmParameterException;
	import java.security.NoSuchAlgorithmException;
	import java.security.NoSuchProviderException;
	import java.security.PrivilegedAction;
	import java.security.Provider;
	import java.security.Security;
	import java.util.Collection;

	import sun.security.jca.*;
	import sun.security.jca.GetInstance.Instance;

	/**
	* A class for retrieving {@code Certificate}s and {@code CRL}s
	* from a repository.
	* <p>
	* This class uses a provider-based architecture.
	* To create a {@code CertStore}, call one of the static
	* {@code getInstance} methods, passing in the type of
	* {@code CertStore} desired, any applicable initialization parameters
	* and optionally the name of the provider desired.
	* <p>
	* Once the {@code CertStore} has been created, it can be used to
	* retrieve {@code Certificate}s and {@code CRL}s by calling its
	* {@link #getCertificates(CertSelector selector) getCertificates} and
	* {@link #getCRLs(CRLSelector selector) getCRLs} methods.
	* <p>
	* Unlike a {@link java.security.KeyStore KeyStore}, which provides access
	* to a cache of private keys and trusted certificates, a
	* {@code CertStore} is designed to provide access to a potentially
	* vast repository of untrusted certificates and CRLs. For example, an LDAP
	* implementation of {@code CertStore} provides access to certificates
	* and CRLs stored in one or more directories using the LDAP protocol and the
	* schema as defined in the RFC service attribute.
	*
	* <p> Every implementation of the Java platform is required to support the
	* following standard {@code CertStore} type:
	* <ul>
	* <li>{@code Collection}</li>
	* </ul>
	* This type is described in the <a href=
	* "{@docRoot}/../technotes/guides/security/StandardNames.html#CertStore">
	* CertStore section</a> of the
	* Java Cryptography Architecture Standard Algorithm Name Documentation.
	* Consult the release documentation for your implementation to see if any
	* other types are supported.
	*
	* <p>
	* <b>Concurrent Access</b>
	* <p>
	* All public methods of {@code CertStore} objects must be thread-safe.
	* That is, multiple threads may concurrently invoke these methods on a
	* single {@code CertStore} object (or more than one) with no
	* ill effects. This allows a {@code CertPathBuilder} to search for a
	* CRL while simultaneously searching for further certificates, for instance.
	* <p>
	* The static methods of this class are also guaranteed to be thread-safe.
	* Multiple threads may concurrently invoke the static methods defined in
	* this class with no ill effects.
	*
	* @since 1.4
	* @author Sean Mullan, Steve Hanna
	*/
	public class CertStore {
	/*
	* Constant to lookup in the Security properties file to determine
	* the default certstore type. In the Security properties file, the
	* default certstore type is given as:
	* <pre>
	* certstore.type=LDAP
	* </pre>
	*/
	private static final String CERTSTORE_TYPE = "certstore.type";
	private CertStoreSpi storeSpi;
	private Provider provider;
	private String type;
	private CertStoreParameters params;

	/**
	* Creates a {@code CertStore} object of the given type, and
	* encapsulates the given provider implementation (SPI object) in it.
	*
	* @param storeSpi the provider implementation
	* @param provider the provider
	* @param type the type
	* @param params the initialization parameters (may be {@code null})
	*/
	protected CertStore(CertStoreSpi storeSpi, Provider provider,
	String type, CertStoreParameters params) {
	this.storeSpi = storeSpi;
	this.provider = provider;
	this.type = type;
	if (params != null)
	this.params = (CertStoreParameters) params.clone();
	}

	/**
	* Returns a {@code Collection} of {@code Certificate}s that
	* match the specified selector. If no {@code Certificate}s
	* match the selector, an empty {@code Collection} will be returned.
	* <p>
	* For some {@code CertStore} types, the resulting
	* {@code Collection} may not contain <b>all</b> of the
	* {@code Certificate}s that match the selector. For instance,
	* an LDAP {@code CertStore} may not search all entries in the
	* directory. Instead, it may just search entries that are likely to
	* contain the {@code Certificate}s it is looking for.
	* <p>
	* Some {@code CertStore} implementations (especially LDAP
	* {@code CertStore}s) may throw a {@code CertStoreException}
	* unless a non-null {@code CertSelector} is provided that
	* includes specific criteria that can be used to find the certificates.
	* Issuer and/or subject names are especially useful criteria.
	*
	* @param selector A {@code CertSelector} used to select which
	* {@code Certificate}s should be returned. Specify {@code null}
	* to return all {@code Certificate}s (if supported).
	* @return A {@code Collection} of {@code Certificate}s that
	* match the specified selector (never {@code null})
	* @throws CertStoreException if an exception occurs
	*/
	public final Collection<? extends Certificate> getCertificates
	(CertSelector selector) throws CertStoreException {
	return storeSpi.engineGetCertificates(selector);
	}

	/**
	* Returns a {@code Collection} of {@code CRL}s that
	* match the specified selector. If no {@code CRL}s
	* match the selector, an empty {@code Collection} will be returned.
	* <p>
	* For some {@code CertStore} types, the resulting
	* {@code Collection} may not contain <b>all</b> of the
	* {@code CRL}s that match the selector. For instance,
	* an LDAP {@code CertStore} may not search all entries in the
	* directory. Instead, it may just search entries that are likely to
	* contain the {@code CRL}s it is looking for.
	* <p>
	* Some {@code CertStore} implementations (especially LDAP
	* {@code CertStore}s) may throw a {@code CertStoreException}
	* unless a non-null {@code CRLSelector} is provided that
	* includes specific criteria that can be used to find the CRLs.
	* Issuer names and/or the certificate to be checked are especially useful.
	*
	* @param selector A {@code CRLSelector} used to select which
	* {@code CRL}s should be returned. Specify {@code null}
	* to return all {@code CRL}s (if supported).
	* @return A {@code Collection} of {@code CRL}s that
	* match the specified selector (never {@code null})
	* @throws CertStoreException if an exception occurs
	*/
	public final Collection<? extends CRL> getCRLs(CRLSelector selector)
	throws CertStoreException {
	return storeSpi.engineGetCRLs(selector);
	}

	/**
	* Returns a {@code CertStore} object that implements the specified
	* {@code CertStore} type and is initialized with the specified
	* parameters.
	*
	* <p> This method traverses the list of registered security Providers,
	* starting with the most preferred Provider.
	* A new CertStore object encapsulating the
	* CertStoreSpi implementation from the first
	* Provider that supports the specified type is returned.
	*
	* <p> Note that the list of registered providers may be retrieved via
	* the {@link Security#getProviders() Security.getProviders()} method.
	*
	* <p>The {@code CertStore} that is returned is initialized with the
	* specified {@code CertStoreParameters}. The type of parameters
	* needed may vary between different types of {@code CertStore}s.
	* Note that the specified {@code CertStoreParameters} object is
	* cloned.
	*
	* @param type the name of the requested {@code CertStore} type.
	* See the CertStore section in the <a href=
	* "{@docRoot}/../technotes/guides/security/StandardNames.html#CertStore">
	* Java Cryptography Architecture Standard Algorithm Name Documentation</a>
	* for information about standard types.
	*
	* @param params the initialization parameters (may be {@code null}).
	*
	* @return a {@code CertStore} object that implements the specified
	* {@code CertStore} type.
	*
	* @throws NoSuchAlgorithmException if no Provider supports a
	* CertStoreSpi implementation for the specified type.
	*
	* @throws InvalidAlgorithmParameterException if the specified
	* initialization parameters are inappropriate for this
	* {@code CertStore}.
	*
	* @see java.security.Provider
	*/
	public static CertStore getInstance(String type, CertStoreParameters params)
	throws InvalidAlgorithmParameterException,
	NoSuchAlgorithmException {
	try {
	Instance instance = GetInstance.getInstance("CertStore",
	CertStoreSpi.class, type, params);
	return new CertStore((CertStoreSpi)instance.impl,
	instance.provider, type, params);
	} catch (NoSuchAlgorithmException e) {
	return handleException(e);
	}
	}

	private static CertStore handleException(NoSuchAlgorithmException e)
	throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
	Throwable cause = e.getCause();
	if (cause instanceof InvalidAlgorithmParameterException) {
	throw (InvalidAlgorithmParameterException)cause;
	}
	throw e;
	}

	/**
	* Returns a {@code CertStore} object that implements the specified
	* {@code CertStore} type.
	*
	* <p> A new CertStore object encapsulating the
	* CertStoreSpi implementation from the specified provider
	* is returned. The specified provider must be registered
	* in the security provider list.
	*
	* <p> Note that the list of registered providers may be retrieved via
	* the {@link Security#getProviders() Security.getProviders()} method.
	*
	* <p>The {@code CertStore} that is returned is initialized with the
	* specified {@code CertStoreParameters}. The type of parameters
	* needed may vary between different types of {@code CertStore}s.
	* Note that the specified {@code CertStoreParameters} object is
	* cloned.
	*
	* @param type the requested {@code CertStore} type.
	* See the CertStore section in the <a href=
	* "{@docRoot}/../technotes/guides/security/StandardNames.html#CertStore">
	* Java Cryptography Architecture Standard Algorithm Name Documentation</a>
	* for information about standard types.
	*
	* @param params the initialization parameters (may be {@code null}).
	*
	* @param provider the name of the provider.
	*
	* @return a {@code CertStore} object that implements the
	* specified type.
	*
	* @throws NoSuchAlgorithmException if a CertStoreSpi
	* implementation for the specified type is not
	* available from the specified provider.
	*
	* @throws InvalidAlgorithmParameterException if the specified
	* initialization parameters are inappropriate for this
	* {@code CertStore}.
	*
	* @throws NoSuchProviderException if the specified provider is not
	* registered in the security provider list.
	*
	* @exception IllegalArgumentException if the {@code provider} is
	* null or empty.
	*
	* @see java.security.Provider
	*/
	public static CertStore getInstance(String type,
	CertStoreParameters params, String provider)
	throws InvalidAlgorithmParameterException,
	NoSuchAlgorithmException, NoSuchProviderException {
	try {
	Instance instance = GetInstance.getInstance("CertStore",
	CertStoreSpi.class, type, params, provider);
	return new CertStore((CertStoreSpi)instance.impl,
	instance.provider, type, params);
	} catch (NoSuchAlgorithmException e) {
	return handleException(e);
	}
	}

	/**
	* Returns a {@code CertStore} object that implements the specified
	* {@code CertStore} type.
	*
	* <p> A new CertStore object encapsulating the
	* CertStoreSpi implementation from the specified Provider
	* object is returned. Note that the specified Provider object
	* does not have to be registered in the provider list.
	*
	* <p>The {@code CertStore} that is returned is initialized with the
	* specified {@code CertStoreParameters}. The type of parameters
	* needed may vary between different types of {@code CertStore}s.
	* Note that the specified {@code CertStoreParameters} object is
	* cloned.
	*
	* @param type the requested {@code CertStore} type.
	* See the CertStore section in the <a href=
	* "{@docRoot}/../technotes/guides/security/StandardNames.html#CertStore">
	* Java Cryptography Architecture Standard Algorithm Name Documentation</a>
	* for information about standard types.
	*
	* @param params the initialization parameters (may be {@code null}).
	*
	* @param provider the provider.
	*
	* @return a {@code CertStore} object that implements the
	* specified type.
	*
	* @exception NoSuchAlgorithmException if a CertStoreSpi
	* implementation for the specified type is not available
	* from the specified Provider object.
	*
	* @throws InvalidAlgorithmParameterException if the specified
	* initialization parameters are inappropriate for this
	* {@code CertStore}
	*
	* @exception IllegalArgumentException if the {@code provider} is
	* null.
	*
	* @see java.security.Provider
	*/
	public static CertStore getInstance(String type, CertStoreParameters params,
	Provider provider) throws NoSuchAlgorithmException,
	InvalidAlgorithmParameterException {
	try {
	Instance instance = GetInstance.getInstance("CertStore",
	CertStoreSpi.class, type, params, provider);
	return new CertStore((CertStoreSpi)instance.impl,
	instance.provider, type, params);
	} catch (NoSuchAlgorithmException e) {
	return handleException(e);
	}
	}

	/**
	* Returns the parameters used to initialize this {@code CertStore}.
	* Note that the {@code CertStoreParameters} object is cloned before
	* it is returned.
	*
	* @return the parameters used to initialize this {@code CertStore}
	* (may be {@code null})
	*/
	public final CertStoreParameters getCertStoreParameters() {
	return (params == null ? null : (CertStoreParameters) params.clone());
	}

	/**
	* Returns the type of this {@code CertStore}.
	*
	* @return the type of this {@code CertStore}
	*/
	public final String getType() {
	return this.type;
	}

	/**
	* Returns the provider of this {@code CertStore}.
	*
	* @return the provider of this {@code CertStore}
	*/
	public final Provider getProvider() {
	return this.provider;
	}

	/**
	* Returns the default {@code CertStore} type as specified by the
	* {@code certstore.type} security property, or the string
	* {@literal "LDAP"} if no such property exists.
	*
	* <p>The default {@code CertStore} type can be used by applications
	* that do not want to use a hard-coded type when calling one of the
	* {@code getInstance} methods, and want to provide a default
	* {@code CertStore} type in case a user does not specify its own.
	*
	* <p>The default {@code CertStore} type can be changed by setting
	* the value of the {@code certstore.type} security property to the
	* desired type.
	*
	* @see java.security.Security security properties
	* @return the default {@code CertStore} type as specified by the
	* {@code certstore.type} security property, or the string
	* {@literal "LDAP"} if no such property exists.
	*/
	public final static String getDefaultType() {
	String cstype;
	cstype = AccessController.doPrivileged(new PrivilegedAction<String>() {
	public String run() {
	return Security.getProperty(CERTSTORE_TYPE);
	}
	});
	if (cstype == null) {
	cstype = "LDAP";
	}
	return cstype;
	}
	}

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