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	/*
	* Copyright (c) 2007, 2014, 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.io.IOException;
	import java.io.OutputStream;
	import java.util.Date;
	import java.util.Enumeration;

	import sun.security.util.*;

	/**
	* From RFC 5280:
	* <p>
	* The invalidity date is a non-critical CRL entry extension that
	* provides the date on which it is known or suspected that the private
	* key was compromised or that the certificate otherwise became invalid.
	* This date may be earlier than the revocation date in the CRL entry,
	* which is the date at which the CA processed the revocation. When a
	* revocation is first posted by a CRL issuer in a CRL, the invalidity
	* date may precede the date of issue of earlier CRLs, but the
	* revocation date SHOULD NOT precede the date of issue of earlier CRLs.
	* Whenever this information is available, CRL issuers are strongly
	* encouraged to share it with CRL users.
	* <p>
	* The GeneralizedTime values included in this field MUST be expressed
	* in Greenwich Mean Time (Zulu), and MUST be specified and interpreted
	* as defined in section 4.1.2.5.2.
	* <pre>
	* id-ce-invalidityDate OBJECT IDENTIFIER ::= { id-ce 24 }
	*
	* invalidityDate ::= GeneralizedTime
	* </pre>
	*
	* @author Sean Mullan
	*/
	public class InvalidityDateExtension extends Extension
	implements CertAttrSet<String> {

	/**
	* Attribute name and Reason codes
	*/
	public static final String NAME = "InvalidityDate";
	public static final String DATE = "date";

	private Date date;

	private void encodeThis() throws IOException {
	if (date == null) {
	this.extensionValue = null;
	return;
	}
	DerOutputStream dos = new DerOutputStream();
	dos.putGeneralizedTime(date);
	this.extensionValue = dos.toByteArray();
	}

	/**
	* Create a InvalidityDateExtension with the passed in date.
	* Criticality automatically set to false.
	*
	* @param date the invalidity date
	*/
	public InvalidityDateExtension(Date date) throws IOException {
	this(false, date);
	}

	/**
	* Create a InvalidityDateExtension with the passed in date.
	*
	* @param critical true if the extension is to be treated as critical.
	* @param date the invalidity date
	*/
	public InvalidityDateExtension(boolean critical, Date date)
	throws IOException {
	this.extensionId = PKIXExtensions.InvalidityDate_Id;
	this.critical = critical;
	this.date = date;
	encodeThis();
	}

	/**
	* Create the extension from the passed DER encoded value of the same.
	*
	* @param critical true if the extension is to be treated as critical.
	* @param value an array of DER encoded bytes of the actual value.
	* @exception ClassCastException if value is not an array of bytes
	* @exception IOException on error.
	*/
	public InvalidityDateExtension(Boolean critical, Object value)
	throws IOException {
	this.extensionId = PKIXExtensions.InvalidityDate_Id;
	this.critical = critical.booleanValue();
	this.extensionValue = (byte[]) value;
	DerValue val = new DerValue(this.extensionValue);
	this.date = val.getGeneralizedTime();
	}

	/**
	* Set the attribute value.
	*/
	public void set(String name, Object obj) throws IOException {
	if (!(obj instanceof Date)) {
	throw new IOException("Attribute must be of type Date.");
	}
	if (name.equalsIgnoreCase(DATE)) {
	date = (Date) obj;
	} else {
	throw new IOException
	("Name not supported by InvalidityDateExtension");
	}
	encodeThis();
	}

	/**
	* Get the attribute value.
	*/
	public Date get(String name) throws IOException {
	if (name.equalsIgnoreCase(DATE)) {
	if (date == null) {
	return null;
	} else {
	return (new Date(date.getTime())); // clone
	}
	} else {
	throw new IOException
	("Name not supported by InvalidityDateExtension");
	}
	}

	/**
	* Delete the attribute value.
	*/
	public void delete(String name) throws IOException {
	if (name.equalsIgnoreCase(DATE)) {
	date = null;
	} else {
	throw new IOException
	("Name not supported by InvalidityDateExtension");
	}
	encodeThis();
	}

	/**
	* Returns a printable representation of the Invalidity Date.
	*/
	public String toString() {
	return super.toString() + " Invalidity Date: " + String.valueOf(date);
	}

	/**
	* Write the extension to the DerOutputStream.
	*
	* @param out the DerOutputStream to write the extension to
	* @exception IOException on encoding errors
	*/
	public void encode(OutputStream out) throws IOException {
	DerOutputStream tmp = new DerOutputStream();

	if (this.extensionValue == null) {
	this.extensionId = PKIXExtensions.InvalidityDate_Id;
	this.critical = false;
	encodeThis();
	}
	super.encode(tmp);
	out.write(tmp.toByteArray());
	}

	/**
	* Return an enumeration of names of attributes existing within this
	* attribute.
	*/
	public Enumeration<String> getElements() {
	AttributeNameEnumeration elements = new AttributeNameEnumeration();
	elements.addElement(DATE);

	return elements.elements();
	}

	/**
	* Return the name of this attribute.
	*/
	public String getName() {
	return NAME;
	}

	public static InvalidityDateExtension toImpl(java.security.cert.Extension ext)
	throws IOException {
	if (ext instanceof InvalidityDateExtension) {
	return (InvalidityDateExtension) ext;
	} else {
	return new InvalidityDateExtension
	(Boolean.valueOf(ext.isCritical()), ext.getValue());
	}
	}
	}

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