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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.io.IOException;
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.util.Enumeration;

	import sun.security.util.*;

	/**
	* This class defines the version of the X509 Certificate.
	*
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	* @see CertAttrSet
	*/
	public class CertificateVersion implements CertAttrSet<String> {
	/**
	* X509Certificate Version 1
	*/
	public static final int V1 = 0;
	/**
	* X509Certificate Version 2
	*/
	public static final int V2 = 1;
	/**
	* X509Certificate Version 3
	*/
	public static final int V3 = 2;
	/**
	* Identifier for this attribute, to be used with the
	* get, set, delete methods of Certificate, x509 type.
	*/
	public static final String IDENT = "x509.info.version";
	/**
	* Sub attributes name for this CertAttrSet.
	*/
	public static final String NAME = "version";
	public static final String VERSION = "number";

	// Private data members
	int version = V1;

	// Returns the version number.
	private int getVersion() {
	return(version);
	}

	// Construct the class from the passed DerValue
	private void construct(DerValue derVal) throws IOException {
	if (derVal.isConstructed() && derVal.isContextSpecific()) {
	derVal = derVal.data.getDerValue();
	version = derVal.getInteger();
	if (derVal.data.available() != 0) {
	throw new IOException("X.509 version, bad format");
	}
	}
	}

	/**
	* The default constructor for this class,
	* sets the version to 0 (i.e. X.509 version 1).
	*/
	public CertificateVersion() {
	version = V1;
	}

	/**
	* The constructor for this class for the required version.
	*
	* @param version the version for the certificate.
	* @exception IOException if the version is not valid.
	*/
	public CertificateVersion(int version) throws IOException {

	// check that it is a valid version
	if (version == V1 \|\| version == V2 \|\| version == V3)
	this.version = version;
	else {
	throw new IOException("X.509 Certificate version " +
	version + " not supported.\n");
	}
	}

	/**
	* Create the object, decoding the values from the passed DER stream.
	*
	* @param in the DerInputStream to read the CertificateVersion from.
	* @exception IOException on decoding errors.
	*/
	public CertificateVersion(DerInputStream in) throws IOException {
	version = V1;
	DerValue derVal = in.getDerValue();

	construct(derVal);
	}

	/**
	* Create the object, decoding the values from the passed stream.
	*
	* @param in the InputStream to read the CertificateVersion from.
	* @exception IOException on decoding errors.
	*/
	public CertificateVersion(InputStream in) throws IOException {
	version = V1;
	DerValue derVal = new DerValue(in);

	construct(derVal);
	}

	/**
	* Create the object, decoding the values from the passed DerValue.
	*
	* @param val the Der encoded value.
	* @exception IOException on decoding errors.
	*/
	public CertificateVersion(DerValue val) throws IOException {
	version = V1;

	construct(val);
	}

	/**
	* Return the version number of the certificate.
	*/
	public String toString() {
	return("Version: V" + (version+1));
	}

	/**
	* Encode the CertificateVersion period in DER form to the stream.
	*
	* @param out the OutputStream to marshal the contents to.
	* @exception IOException on errors.
	*/
	public void encode(OutputStream out) throws IOException {
	// Nothing for default
	if (version == V1) {
	return;
	}
	DerOutputStream tmp = new DerOutputStream();
	tmp.putInteger(version);

	DerOutputStream seq = new DerOutputStream();
	seq.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0),
	tmp);

	out.write(seq.toByteArray());
	}

	/**
	* Set the attribute value.
	*/
	public void set(String name, Object obj) throws IOException {
	if (!(obj instanceof Integer)) {
	throw new IOException("Attribute must be of type Integer.");
	}
	if (name.equalsIgnoreCase(VERSION)) {
	version = ((Integer)obj).intValue();
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet: CertificateVersion.");
	}
	}

	/**
	* Get the attribute value.
	*/
	public Integer get(String name) throws IOException {
	if (name.equalsIgnoreCase(VERSION)) {
	return(getVersion());
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet: CertificateVersion.");
	}
	}

	/**
	* Delete the attribute value.
	*/
	public void delete(String name) throws IOException {
	if (name.equalsIgnoreCase(VERSION)) {
	version = V1;
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet: CertificateVersion.");
	}
	}

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

	return (elements.elements());
	}

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

	/**
	* Compare versions.
	*/
	public int compare(int vers) {
	return(version - vers);
	}
	}

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