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	/*
	* Copyright (c) 2000, 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 sun.security.util.DerValue;
	import sun.security.util.DerOutputStream;

	/**
	* This class defines the certificate policies extension which specifies the
	* policies under which the certificate has been issued
	* and the purposes for which the certificate may be used.
	* <p>
	* Applications with specific policy requirements are expected to have a
	* list of those policies which they will accept and to compare the
	* policy OIDs in the certificate to that list. If this extension is
	* critical, the path validation software MUST be able to interpret this
	* extension (including the optional qualifier), or MUST reject the
	* certificate.
	* <p>
	* Optional qualifiers are not supported in this implementation, as they are
	* not recommended by RFC2459.
	*
	* The ASN.1 syntax for this is (IMPLICIT tagging is defined in the
	* module definition):
	* <pre>
	* id-ce-certificatePolicies OBJECT IDENTIFIER ::= { id-ce 32 }
	*
	* certificatePolicies ::= SEQUENCE SIZE (1..MAX) OF PolicyInformation
	*
	* PolicyInformation ::= SEQUENCE {
	* policyIdentifier CertPolicyId,
	* policyQualifiers SEQUENCE SIZE (1..MAX) OF
	* PolicyQualifierInfo OPTIONAL }
	*
	* CertPolicyId ::= OBJECT IDENTIFIER
	* </pre>
	* @author Anne Anderson
	* @since 1.4
	* @see Extension
	* @see CertAttrSet
	*/
	public class CertificatePoliciesExtension 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.CertificatePolicies";
	/**
	* Attribute names.
	*/
	public static final String NAME = "CertificatePolicies";
	public static final String POLICIES = "policies";

	/**
	* List of PolicyInformation for this object.
	*/
	private List<PolicyInformation> certPolicies;

	// Encode this extension value.
	private void encodeThis() throws IOException {
	if (certPolicies == null \|\| certPolicies.isEmpty()) {
	this.extensionValue = null;
	} else {
	DerOutputStream os = new DerOutputStream();
	DerOutputStream tmp = new DerOutputStream();

	for (PolicyInformation info : certPolicies) {
	info.encode(tmp);
	}

	os.write(DerValue.tag_Sequence, tmp);
	this.extensionValue = os.toByteArray();
	}
	}

	/**
	* Create a CertificatePoliciesExtension object from
	* a List of PolicyInformation; the criticality is set to false.
	*
	* @param certPolicies the List of PolicyInformation.
	*/
	public CertificatePoliciesExtension(List<PolicyInformation> certPolicies)
	throws IOException {
	this(Boolean.FALSE, certPolicies);
	}

	/**
	* Create a CertificatePoliciesExtension object from
	* a List of PolicyInformation with specified criticality.
	*
	* @param critical true if the extension is to be treated as critical.
	* @param certPolicies the List of PolicyInformation.
	*/
	public CertificatePoliciesExtension(Boolean critical,
	List<PolicyInformation> certPolicies) throws IOException {
	this.certPolicies = certPolicies;
	this.extensionId = PKIXExtensions.CertificatePolicies_Id;
	this.critical = critical.booleanValue();
	encodeThis();
	}

	/**
	* Create the extension from its DER encoded value and criticality.
	*
	* @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 CertificatePoliciesExtension(Boolean critical, Object value)
	throws IOException {
	this.extensionId = PKIXExtensions.CertificatePolicies_Id;
	this.critical = critical.booleanValue();
	this.extensionValue = (byte[]) value;
	DerValue val = new DerValue(this.extensionValue);
	if (val.tag != DerValue.tag_Sequence) {
	throw new IOException("Invalid encoding for " +
	"CertificatePoliciesExtension.");
	}
	certPolicies = new ArrayList<PolicyInformation>();
	while (val.data.available() != 0) {
	DerValue seq = val.data.getDerValue();
	PolicyInformation policy = new PolicyInformation(seq);
	certPolicies.add(policy);
	}
	}

	/**
	* Return the extension as user readable string.
	*/
	public String toString() {
	if (certPolicies == null) {
	return "";
	}

	StringBuilder sb = new StringBuilder();
	sb.append(super.toString())
	.append("CertificatePolicies [\n");
	for (PolicyInformation info : certPolicies) {
	sb.append(info);
	}
	sb.append("]\n");
	return sb.toString();
	}

	/**
	* 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 (extensionValue == null) {
	extensionId = PKIXExtensions.CertificatePolicies_Id;
	critical = false;
	encodeThis();
	}
	super.encode(tmp);
	out.write(tmp.toByteArray());
	}

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

	/**
	* Get the attribute value.
	*/
	public List<PolicyInformation> get(String name) throws IOException {
	if (name.equalsIgnoreCase(POLICIES)) {
	//XXXX May want to consider cloning this
	return certPolicies;
	} else {
	throw new IOException("Attribute name [" + name +
	"] not recognized by " +
	"CertAttrSet:CertificatePoliciesExtension.");
	}
	}

	/**
	* Delete the attribute value.
	*/
	public void delete(String name) throws IOException {
	if (name.equalsIgnoreCase(POLICIES)) {
	certPolicies = null;
	} else {
	throw new IOException("Attribute name [" + name +
	"] not recognized by " +
	"CertAttrSet:CertificatePoliciesExtension.");
	}
	encodeThis();
	}

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

	return (elements.elements());
	}

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

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