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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.Enumeration;

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

	/**
	* This class represents the Inhibit Any-Policy Extension.
	*
	* <p>The inhibit any-policy extension can be used in certificates issued
	* to CAs. The inhibit any-policy indicates that the special any-policy
	* OID, with the value {2 5 29 32 0}, is not considered an explicit
	* match for other certificate policies. The value indicates the number
	* of additional certificates that may appear in the path before any-
	* policy is no longer permitted. For example, a value of one indicates
	* that any-policy may be processed in certificates issued by the sub-
	* ject of this certificate, but not in additional certificates in the
	* path.
	* <p>
	* This extension MUST be critical.
	* <p>
	* The ASN.1 syntax for this extension is:
	* <pre>{@code
	* id-ce-inhibitAnyPolicy OBJECT IDENTIFIER ::= { id-ce 54 }
	*
	* InhibitAnyPolicy ::= SkipCerts
	*
	* SkipCerts ::= INTEGER (0..MAX)
	* }</pre>
	* @author Anne Anderson
	* @see CertAttrSet
	* @see Extension
	*/
	public class InhibitAnyPolicyExtension extends Extension
	implements CertAttrSet<String> {

	private static final Debug debug = Debug.getInstance("certpath");

	/**
	* 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.InhibitAnyPolicy";

	/**
	* Object identifier for "any-policy"
	*/
	public static ObjectIdentifier AnyPolicy_Id;
	static {
	try {
	AnyPolicy_Id = new ObjectIdentifier("2.5.29.32.0");
	} catch (IOException ioe) {
	// Should not happen
	}
	}

	/**
	* Attribute names.
	*/
	public static final String NAME = "InhibitAnyPolicy";
	public static final String SKIP_CERTS = "skip_certs";

	// Private data members
	private int skipCerts = Integer.MAX_VALUE;

	// Encode this extension value
	private void encodeThis() throws IOException {
	DerOutputStream out = new DerOutputStream();
	out.putInteger(skipCerts);
	this.extensionValue = out.toByteArray();
	}

	/**
	* Default constructor for this object.
	*
	* @param skipCerts specifies the depth of the certification path.
	* Use value of -1 to request unlimited depth.
	*/
	public InhibitAnyPolicyExtension(int skipCerts) throws IOException {
	if (skipCerts < -1)
	throw new IOException("Invalid value for skipCerts");
	if (skipCerts == -1)
	this.skipCerts = Integer.MAX_VALUE;
	else
	this.skipCerts = skipCerts;
	this.extensionId = PKIXExtensions.InhibitAnyPolicy_Id;
	critical = true;
	encodeThis();
	}

	/**
	* Create the extension from the passed DER encoded value of the same.
	*
	* @param critical criticality flag to use. Must be true for this
	* extension.
	* @param value a byte array holding the DER-encoded extension value.
	* @exception ClassCastException if value is not an array of bytes
	* @exception IOException on error.
	*/
	public InhibitAnyPolicyExtension(Boolean critical, Object value)
	throws IOException {

	this.extensionId = PKIXExtensions.InhibitAnyPolicy_Id;

	if (!critical.booleanValue())
	throw new IOException("Criticality cannot be false for " +
	"InhibitAnyPolicy");
	this.critical = critical.booleanValue();

	this.extensionValue = (byte[]) value;
	DerValue val = new DerValue(this.extensionValue);
	if (val.tag != DerValue.tag_Integer)
	throw new IOException("Invalid encoding of InhibitAnyPolicy: "
	+ "data not integer");

	if (val.data == null)
	throw new IOException("Invalid encoding of InhibitAnyPolicy: "
	+ "null data");
	int skipCertsValue = val.getInteger();
	if (skipCertsValue < -1)
	throw new IOException("Invalid value for skipCerts");
	if (skipCertsValue == -1) {
	this.skipCerts = Integer.MAX_VALUE;
	} else {
	this.skipCerts = skipCertsValue;
	}
	}

	/**
	* Return user readable form of extension.
	*/
	public String toString() {
	String s = super.toString() + "InhibitAnyPolicy: " + skipCerts + "\n";
	return s;
	}

	/**
	* Encode this extension value to the output stream.
	*
	* @param out the DerOutputStream to encode the extension to.
	*/
	public void encode(OutputStream out) throws IOException {
	DerOutputStream tmp = new DerOutputStream();
	if (extensionValue == null) {
	this.extensionId = PKIXExtensions.InhibitAnyPolicy_Id;
	critical = true;
	encodeThis();
	}
	super.encode(tmp);

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

	/**
	* Set the attribute value.
	*
	* @param name name of attribute to set. Must be SKIP_CERTS.
	* @param obj value to which attribute is to be set. Must be Integer
	* type.
	* @throws IOException on error
	*/
	public void set(String name, Object obj) throws IOException {
	if (name.equalsIgnoreCase(SKIP_CERTS)) {
	if (!(obj instanceof Integer))
	throw new IOException("Attribute value should be of type Integer.");
	int skipCertsValue = ((Integer)obj).intValue();
	if (skipCertsValue < -1)
	throw new IOException("Invalid value for skipCerts");
	if (skipCertsValue == -1) {
	skipCerts = Integer.MAX_VALUE;
	} else {
	skipCerts = skipCertsValue;
	}
	} else
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:InhibitAnyPolicy.");
	encodeThis();
	}

	/**
	* Get the attribute value.
	*
	* @param name name of attribute to get. Must be SKIP_CERTS.
	* @return value of the attribute. In this case it will be of type
	* Integer.
	* @throws IOException on error
	*/
	public Integer get(String name) throws IOException {
	if (name.equalsIgnoreCase(SKIP_CERTS))
	return (skipCerts);
	else
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:InhibitAnyPolicy.");
	}

	/**
	* Delete the attribute value.
	*
	* @param name name of attribute to delete. Must be SKIP_CERTS.
	* @throws IOException on error. In this case, IOException will always be
	* thrown, because the only attribute, SKIP_CERTS, is
	* required.
	*/
	public void delete(String name) throws IOException {
	if (name.equalsIgnoreCase(SKIP_CERTS))
	throw new IOException("Attribute " + SKIP_CERTS +
	" may not be deleted.");
	else
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:InhibitAnyPolicy.");
	}

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

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

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