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	/*
	* Copyright (c) 1997, 2011, 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.x509;

	import java.util.*;
	import java.io.IOException;

	import java.security.cert.CertificateException;

	import sun.security.util.*;

	/**
	* This class defines the mapping from OID {@literal &} name to classes and vice
	* versa. Used by CertificateExtensions {@literal &} PKCS10 to get the java
	* classes associated with a particular OID/name.
	*
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	* @author Andreas Sterbenz
	*
	*/
	public class OIDMap {

	private OIDMap() {
	// empty
	}

	// "user-friendly" names
	private static final String ROOT = X509CertImpl.NAME + "." +
	X509CertInfo.NAME + "." +
	X509CertInfo.EXTENSIONS;
	private static final String AUTH_KEY_IDENTIFIER = ROOT + "." +
	AuthorityKeyIdentifierExtension.NAME;
	private static final String SUB_KEY_IDENTIFIER = ROOT + "." +
	SubjectKeyIdentifierExtension.NAME;
	private static final String KEY_USAGE = ROOT + "." +
	KeyUsageExtension.NAME;
	private static final String PRIVATE_KEY_USAGE = ROOT + "." +
	PrivateKeyUsageExtension.NAME;
	private static final String POLICY_MAPPINGS = ROOT + "." +
	PolicyMappingsExtension.NAME;
	private static final String SUB_ALT_NAME = ROOT + "." +
	SubjectAlternativeNameExtension.NAME;
	private static final String ISSUER_ALT_NAME = ROOT + "." +
	IssuerAlternativeNameExtension.NAME;
	private static final String BASIC_CONSTRAINTS = ROOT + "." +
	BasicConstraintsExtension.NAME;
	private static final String NAME_CONSTRAINTS = ROOT + "." +
	NameConstraintsExtension.NAME;
	private static final String POLICY_CONSTRAINTS = ROOT + "." +
	PolicyConstraintsExtension.NAME;
	private static final String CRL_NUMBER = ROOT + "." +
	CRLNumberExtension.NAME;
	private static final String CRL_REASON = ROOT + "." +
	CRLReasonCodeExtension.NAME;
	private static final String NETSCAPE_CERT = ROOT + "." +
	NetscapeCertTypeExtension.NAME;
	private static final String CERT_POLICIES = ROOT + "." +
	CertificatePoliciesExtension.NAME;
	private static final String EXT_KEY_USAGE = ROOT + "." +
	ExtendedKeyUsageExtension.NAME;
	private static final String INHIBIT_ANY_POLICY = ROOT + "." +
	InhibitAnyPolicyExtension.NAME;
	private static final String CRL_DIST_POINTS = ROOT + "." +
	CRLDistributionPointsExtension.NAME;

	private static final String CERT_ISSUER = ROOT + "." +
	CertificateIssuerExtension.NAME;
	private static final String SUBJECT_INFO_ACCESS = ROOT + "." +
	SubjectInfoAccessExtension.NAME;
	private static final String AUTH_INFO_ACCESS = ROOT + "." +
	AuthorityInfoAccessExtension.NAME;
	private static final String ISSUING_DIST_POINT = ROOT + "." +
	IssuingDistributionPointExtension.NAME;
	private static final String DELTA_CRL_INDICATOR = ROOT + "." +
	DeltaCRLIndicatorExtension.NAME;
	private static final String FRESHEST_CRL = ROOT + "." +
	FreshestCRLExtension.NAME;
	private static final String OCSPNOCHECK = ROOT + "." +
	OCSPNoCheckExtension.NAME;

	private static final int[] NetscapeCertType_data =
	{ 2, 16, 840, 1, 113730, 1, 1 };

	/** Map ObjectIdentifier(oid) -> OIDInfo(info) */
	private static final Map<ObjectIdentifier,OIDInfo> oidMap;

	/** Map String(friendly name) -> OIDInfo(info) */
	private static final Map<String,OIDInfo> nameMap;

	static {
	oidMap = new HashMap<ObjectIdentifier,OIDInfo>();
	nameMap = new HashMap<String,OIDInfo>();
	addInternal(SUB_KEY_IDENTIFIER, PKIXExtensions.SubjectKey_Id,
	"sun.security.x509.SubjectKeyIdentifierExtension");
	addInternal(KEY_USAGE, PKIXExtensions.KeyUsage_Id,
	"sun.security.x509.KeyUsageExtension");
	addInternal(PRIVATE_KEY_USAGE, PKIXExtensions.PrivateKeyUsage_Id,
	"sun.security.x509.PrivateKeyUsageExtension");
	addInternal(SUB_ALT_NAME, PKIXExtensions.SubjectAlternativeName_Id,
	"sun.security.x509.SubjectAlternativeNameExtension");
	addInternal(ISSUER_ALT_NAME, PKIXExtensions.IssuerAlternativeName_Id,
	"sun.security.x509.IssuerAlternativeNameExtension");
	addInternal(BASIC_CONSTRAINTS, PKIXExtensions.BasicConstraints_Id,
	"sun.security.x509.BasicConstraintsExtension");
	addInternal(CRL_NUMBER, PKIXExtensions.CRLNumber_Id,
	"sun.security.x509.CRLNumberExtension");
	addInternal(CRL_REASON, PKIXExtensions.ReasonCode_Id,
	"sun.security.x509.CRLReasonCodeExtension");
	addInternal(NAME_CONSTRAINTS, PKIXExtensions.NameConstraints_Id,
	"sun.security.x509.NameConstraintsExtension");
	addInternal(POLICY_MAPPINGS, PKIXExtensions.PolicyMappings_Id,
	"sun.security.x509.PolicyMappingsExtension");
	addInternal(AUTH_KEY_IDENTIFIER, PKIXExtensions.AuthorityKey_Id,
	"sun.security.x509.AuthorityKeyIdentifierExtension");
	addInternal(POLICY_CONSTRAINTS, PKIXExtensions.PolicyConstraints_Id,
	"sun.security.x509.PolicyConstraintsExtension");
	addInternal(NETSCAPE_CERT, ObjectIdentifier.newInternal
	(new int[] {2,16,840,1,113730,1,1}),
	"sun.security.x509.NetscapeCertTypeExtension");
	addInternal(CERT_POLICIES, PKIXExtensions.CertificatePolicies_Id,
	"sun.security.x509.CertificatePoliciesExtension");
	addInternal(EXT_KEY_USAGE, PKIXExtensions.ExtendedKeyUsage_Id,
	"sun.security.x509.ExtendedKeyUsageExtension");
	addInternal(INHIBIT_ANY_POLICY, PKIXExtensions.InhibitAnyPolicy_Id,
	"sun.security.x509.InhibitAnyPolicyExtension");
	addInternal(CRL_DIST_POINTS, PKIXExtensions.CRLDistributionPoints_Id,
	"sun.security.x509.CRLDistributionPointsExtension");
	addInternal(CERT_ISSUER, PKIXExtensions.CertificateIssuer_Id,
	"sun.security.x509.CertificateIssuerExtension");
	addInternal(SUBJECT_INFO_ACCESS, PKIXExtensions.SubjectInfoAccess_Id,
	"sun.security.x509.SubjectInfoAccessExtension");
	addInternal(AUTH_INFO_ACCESS, PKIXExtensions.AuthInfoAccess_Id,
	"sun.security.x509.AuthorityInfoAccessExtension");
	addInternal(ISSUING_DIST_POINT,
	PKIXExtensions.IssuingDistributionPoint_Id,
	"sun.security.x509.IssuingDistributionPointExtension");
	addInternal(DELTA_CRL_INDICATOR, PKIXExtensions.DeltaCRLIndicator_Id,
	"sun.security.x509.DeltaCRLIndicatorExtension");
	addInternal(FRESHEST_CRL, PKIXExtensions.FreshestCRL_Id,
	"sun.security.x509.FreshestCRLExtension");
	addInternal(OCSPNOCHECK, PKIXExtensions.OCSPNoCheck_Id,
	"sun.security.x509.OCSPNoCheckExtension");
	}

	/**
	* Add attributes to the table. For internal use in the static
	* initializer.
	*/
	private static void addInternal(String name, ObjectIdentifier oid,
	String className) {
	OIDInfo info = new OIDInfo(name, oid, className);
	oidMap.put(oid, info);
	nameMap.put(name, info);
	}

	/**
	* Inner class encapsulating the mapping info and Class loading.
	*/
	private static class OIDInfo {

	final ObjectIdentifier oid;
	final String name;
	final String className;
	private volatile Class<?> clazz;

	OIDInfo(String name, ObjectIdentifier oid, String className) {
	this.name = name;
	this.oid = oid;
	this.className = className;
	}

	OIDInfo(String name, ObjectIdentifier oid, Class<?> clazz) {
	this.name = name;
	this.oid = oid;
	this.className = clazz.getName();
	this.clazz = clazz;
	}

	/**
	* Return the Class object associated with this attribute.
	*/
	Class<?> getClazz() throws CertificateException {
	try {
	Class<?> c = clazz;
	if (c == null) {
	c = Class.forName(className);
	clazz = c;
	}
	return c;
	} catch (ClassNotFoundException e) {
	throw new CertificateException("Could not load class: " + e, e);
	}
	}
	}

	/**
	* Add a name to lookup table.
	*
	* @param name the name of the attr
	* @param oid the string representation of the object identifier for
	* the class.
	* @param clazz the Class object associated with this attribute
	* @exception CertificateException on errors.
	*/
	public static void addAttribute(String name, String oid, Class<?> clazz)
	throws CertificateException {
	ObjectIdentifier objId;
	try {
	objId = new ObjectIdentifier(oid);
	} catch (IOException ioe) {
	throw new CertificateException
	("Invalid Object identifier: " + oid);
	}
	OIDInfo info = new OIDInfo(name, objId, clazz);
	if (oidMap.put(objId, info) != null) {
	throw new CertificateException
	("Object identifier already exists: " + oid);
	}
	if (nameMap.put(name, info) != null) {
	throw new CertificateException("Name already exists: " + name);
	}
	}

	/**
	* Return user friendly name associated with the OID.
	*
	* @param oid the name of the object identifier to be returned.
	* @return the user friendly name or null if no name
	* is registered for this oid.
	*/
	public static String getName(ObjectIdentifier oid) {
	OIDInfo info = oidMap.get(oid);
	return (info == null) ? null : info.name;
	}

	/**
	* Return Object identifier for user friendly name.
	*
	* @param name the user friendly name.
	* @return the Object Identifier or null if no oid
	* is registered for this name.
	*/
	public static ObjectIdentifier getOID(String name) {
	OIDInfo info = nameMap.get(name);
	return (info == null) ? null : info.oid;
	}

	/**
	* Return the java class object associated with the user friendly name.
	*
	* @param name the user friendly name.
	* @exception CertificateException if class cannot be instantiated.
	*/
	public static Class<?> getClass(String name) throws CertificateException {
	OIDInfo info = nameMap.get(name);
	return (info == null) ? null : info.getClazz();
	}

	/**
	* Return the java class object associated with the object identifier.
	*
	* @param oid the name of the object identifier to be returned.
	* @exception CertificateException if class cannot be instatiated.
	*/
	public static Class<?> getClass(ObjectIdentifier oid)
	throws CertificateException {
	OIDInfo info = oidMap.get(oid);
	return (info == null) ? null : info.getClazz();
	}

	}

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