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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.OutputStream;
	import java.util.Enumeration;

	import sun.security.util.*;

	/**
	* This represents the Issuer Alternative Name Extension.
	*
	* This extension, if present, allows the issuer to specify multiple
	* alternative names.
	*
	* <p>Extensions are represented as a sequence of the extension identifier
	* (Object Identifier), a boolean flag stating whether the extension is to
	* be treated as being critical and the extension value itself (this is again
	* a DER encoding of the extension value).
	*
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	* @see Extension
	* @see CertAttrSet
	*/
	public class IssuerAlternativeNameExtension
	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.IssuerAlternativeName";
	/**
	* Attribute names.
	*/
	public static final String NAME = "IssuerAlternativeName";
	public static final String ISSUER_NAME = "issuer_name";

	// private data members
	GeneralNames names = null;

	// Encode this extension
	private void encodeThis() throws IOException {
	if (names == null \|\| names.isEmpty()) {
	this.extensionValue = null;
	return;
	}
	DerOutputStream os = new DerOutputStream();
	names.encode(os);
	this.extensionValue = os.toByteArray();
	}

	/**
	* Create a IssuerAlternativeNameExtension with the passed GeneralNames.
	*
	* @param names the GeneralNames for the issuer.
	* @exception IOException on error.
	*/
	public IssuerAlternativeNameExtension(GeneralNames names)
	throws IOException {
	this.names = names;
	this.extensionId = PKIXExtensions.IssuerAlternativeName_Id;
	this.critical = false;
	encodeThis();
	}

	/**
	* Create a IssuerAlternativeNameExtension with the passed criticality
	* and GeneralNames.
	*
	* @param critical true if the extension is to be treated as critical.
	* @param names the GeneralNames for the issuer.
	* @exception IOException on error.
	*/
	public IssuerAlternativeNameExtension(Boolean critical, GeneralNames names)
	throws IOException {
	this.names = names;
	this.extensionId = PKIXExtensions.IssuerAlternativeName_Id;
	this.critical = critical.booleanValue();
	encodeThis();
	}

	/**
	* Create a default IssuerAlternativeNameExtension.
	*/
	public IssuerAlternativeNameExtension() {
	extensionId = PKIXExtensions.IssuerAlternativeName_Id;
	critical = false;
	names = new GeneralNames();
	}

	/**
	* Create the extension from the passed DER encoded value.
	*
	* @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 IssuerAlternativeNameExtension(Boolean critical, Object value)
	throws IOException {
	this.extensionId = PKIXExtensions.IssuerAlternativeName_Id;
	this.critical = critical.booleanValue();
	this.extensionValue = (byte[]) value;
	DerValue val = new DerValue(this.extensionValue);
	if (val.data == null) {
	names = new GeneralNames();
	return;
	}

	names = new GeneralNames(val);
	}

	/**
	* Returns a printable representation of the IssuerAlternativeName.
	*/
	public String toString() {
	StringBuilder sb = new StringBuilder();
	sb.append(super.toString())
	.append("IssuerAlternativeName [\n");
	if (names == null) {
	sb.append(" null\n");
	} else {
	for (GeneralName name : names.names()) {
	sb.append(" ")
	.append(name)
	.append('\n');
	}
	}
	sb.append("]\n");
	return sb.toString();
	}

	/**
	* Write the extension to the OutputStream.
	*
	* @param out the OutputStream to write the extension to.
	* @exception IOException on encoding error.
	*/
	public void encode(OutputStream out) throws IOException {
	DerOutputStream tmp = new DerOutputStream();
	if (extensionValue == null) {
	extensionId = PKIXExtensions.IssuerAlternativeName_Id;
	critical = false;
	encodeThis();
	}
	super.encode(tmp);
	out.write(tmp.toByteArray());
	}

	/**
	* Set the attribute value.
	*/
	public void set(String name, Object obj) throws IOException {
	if (name.equalsIgnoreCase(ISSUER_NAME)) {
	if (!(obj instanceof GeneralNames)) {
	throw new IOException("Attribute value should be of" +
	" type GeneralNames.");
	}
	names = (GeneralNames)obj;
	} else {
	throw new IOException("Attribute name not recognized by " +
	"CertAttrSet:IssuerAlternativeName.");
	}
	encodeThis();
	}

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

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

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

	return (elements.elements());
	}

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

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