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	/*
	* Copyright (c) 2002, 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.OutputStream;

	import java.util.*;
	import java.util.Collections;

	import sun.security.util.DerOutputStream;
	import sun.security.util.DerValue;
	import sun.security.util.ObjectIdentifier;

	/**
	* Represent the CRL Distribution Points Extension (OID = 2.5.29.31).
	* <p>
	* The CRL distribution points extension identifies how CRL information
	* is obtained. The extension SHOULD be non-critical, but the PKIX profile
	* recommends support for this extension by CAs and applications.
	* <p>
	* For PKIX, if the cRLDistributionPoints extension contains a
	* DistributionPointName of type URI, the following semantics MUST be
	* assumed: the URI is a pointer to the current CRL for the associated
	* reasons and will be issued by the associated cRLIssuer. The
	* expected values for the URI conform to the following rules. The
	* name MUST be a non-relative URL, and MUST follow the URL syntax and
	* encoding rules specified in [RFC 1738]. The name must include both
	* a scheme (e.g., "http" or "ftp") and a scheme-specific-part. The
	* scheme- specific-part must include a fully qualified domain name or
	* IP address as the host. As specified in [RFC 1738], the scheme
	* name is not case-sensitive (e.g., "http" is equivalent to "HTTP").
	* The host part is also not case-sensitive, but other components of
	* the scheme-specific-part may be case-sensitive. When comparing
	* URIs, conforming implementations MUST compare the scheme and host
	* without regard to case, but assume the remainder of the
	* scheme-specific-part is case sensitive. Processing rules for other
	* values are not defined by this specification. If the
	* distributionPoint omits reasons, the CRL MUST include revocations
	* for all reasons. If the distributionPoint omits cRLIssuer, the CRL
	* MUST be issued by the CA that issued the certificate.
	* <p>
	* The ASN.1 definition for this is:
	* <pre>
	* id-ce-cRLDistributionPoints OBJECT IDENTIFIER ::= { id-ce 31 }
	*
	* cRLDistributionPoints ::= {
	* CRLDistPointsSyntax }
	*
	* CRLDistPointsSyntax ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint
	* </pre>
	* <p>
	* @author Anne Anderson
	* @author Andreas Sterbenz
	* @since 1.4.2
	* @see DistributionPoint
	* @see Extension
	* @see CertAttrSet
	*/
	public class CRLDistributionPointsExtension extends Extension
	implements CertAttrSet<String> {

	/**
	* Identifier for this attribute, to be used with the
	* get, set, delete methods of Certificate, x509 type.
	*/
	public static final String IDENT =
	"x509.info.extensions.CRLDistributionPoints";

	/**
	* Attribute name.
	*/
	public static final String NAME = "CRLDistributionPoints";
	public static final String POINTS = "points";

	/**
	* The List of DistributionPoint objects.
	*/
	private List<DistributionPoint> distributionPoints;

	private String extensionName;

	/**
	* Create a CRLDistributionPointsExtension from a List of
	* DistributionPoint; the criticality is set to false.
	*
	* @param distributionPoints the list of distribution points
	* @throws IOException on error
	*/
	public CRLDistributionPointsExtension(
	List<DistributionPoint> distributionPoints) throws IOException {

	this(false, distributionPoints);
	}

	/**
	* Create a CRLDistributionPointsExtension from a List of
	* DistributionPoint.
	*
	* @param isCritical the criticality setting.
	* @param distributionPoints the list of distribution points
	* @throws IOException on error
	*/
	public CRLDistributionPointsExtension(boolean isCritical,
	List<DistributionPoint> distributionPoints) throws IOException {

	this(PKIXExtensions.CRLDistributionPoints_Id, isCritical,
	distributionPoints, NAME);
	}

	/**
	* Creates the extension (also called by the subclass).
	*/
	protected CRLDistributionPointsExtension(ObjectIdentifier extensionId,
	boolean isCritical, List<DistributionPoint> distributionPoints,
	String extensionName) throws IOException {

	this.extensionId = extensionId;
	this.critical = isCritical;
	this.distributionPoints = distributionPoints;
	encodeThis();
	this.extensionName = extensionName;
	}

	/**
	* 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 Array of DER encoded bytes of the actual value.
	* @exception IOException on error.
	*/
	public CRLDistributionPointsExtension(Boolean critical, Object value)
	throws IOException {
	this(PKIXExtensions.CRLDistributionPoints_Id, critical, value, NAME);
	}

	/**
	* Creates the extension (also called by the subclass).
	*/
	protected CRLDistributionPointsExtension(ObjectIdentifier extensionId,
	Boolean critical, Object value, String extensionName)
	throws IOException {

	this.extensionId = extensionId;
	this.critical = critical.booleanValue();

	if (!(value instanceof byte[])) {
	throw new IOException("Illegal argument type");
	}

	extensionValue = (byte[])value;
	DerValue val = new DerValue(extensionValue);
	if (val.tag != DerValue.tag_Sequence) {
	throw new IOException("Invalid encoding for " + extensionName +
	" extension.");
	}
	distributionPoints = new ArrayList<DistributionPoint>();
	while (val.data.available() != 0) {
	DerValue seq = val.data.getDerValue();
	DistributionPoint point = new DistributionPoint(seq);
	distributionPoints.add(point);
	}
	this.extensionName = extensionName;
	}

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

	/**
	* 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 {
	encode(out, PKIXExtensions.CRLDistributionPoints_Id, false);
	}

	/**
	* Write the extension to the DerOutputStream.
	* (Also called by the subclass)
	*/
	protected void encode(OutputStream out, ObjectIdentifier extensionId,
	boolean isCritical) throws IOException {

	DerOutputStream tmp = new DerOutputStream();
	if (this.extensionValue == null) {
	this.extensionId = extensionId;
	this.critical = isCritical;
	encodeThis();
	}
	super.encode(tmp);
	out.write(tmp.toByteArray());
	}

	/**
	* Set the attribute value.
	*/
	@SuppressWarnings("unchecked") // Checked with instanceof
	public void set(String name, Object obj) throws IOException {
	if (name.equalsIgnoreCase(POINTS)) {
	if (!(obj instanceof List)) {
	throw new IOException("Attribute value should be of type List.");
	}
	distributionPoints = (List<DistributionPoint>)obj;
	} else {
	throw new IOException("Attribute name [" + name +
	"] not recognized by " +
	"CertAttrSet:" + extensionName + ".");
	}
	encodeThis();
	}

	/**
	* Get the attribute value.
	*/
	public List<DistributionPoint> get(String name) throws IOException {
	if (name.equalsIgnoreCase(POINTS)) {
	return distributionPoints;
	} else {
	throw new IOException("Attribute name [" + name +
	"] not recognized by " +
	"CertAttrSet:" + extensionName + ".");
	}
	}

	/**
	* Delete the attribute value.
	*/
	public void delete(String name) throws IOException {
	if (name.equalsIgnoreCase(POINTS)) {
	distributionPoints =
	Collections.<DistributionPoint>emptyList();
	} else {
	throw new IOException("Attribute name [" + name +
	"] not recognized by " +
	"CertAttrSet:" + extensionName + '.');
	}
	encodeThis();
	}

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

	// Encode this extension value
	private void encodeThis() throws IOException {
	if (distributionPoints.isEmpty()) {
	this.extensionValue = null;
	} else {
	DerOutputStream pnts = new DerOutputStream();
	for (DistributionPoint point : distributionPoints) {
	point.encode(pnts);
	}
	DerOutputStream seq = new DerOutputStream();
	seq.write(DerValue.tag_Sequence, pnts);
	this.extensionValue = seq.toByteArray();
	}
	}

	/**
	* Return the extension as user readable string.
	*/
	public String toString() {
	return super.toString() + extensionName + " [\n "
	+ distributionPoints + "]\n";
	}

	}

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