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	/*
	* Copyright (c) 1997, 2003, 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.util.*;
	import java.io.IOException;

	import sun.security.util.*;

	/**
	* This object class represents the GeneralNames type required in
	* X509 certificates.
	* <p>The ASN.1 syntax for this is:
	* <pre>
	* GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
	* </pre>
	*
	* @author Amit Kapoor
	* @author Hemma Prafullchandra
	*
	*/
	public class GeneralNames {

	private final List<GeneralName> names;

	/**
	* Create the GeneralNames, decoding from the passed DerValue.
	*
	* @param derVal the DerValue to construct the GeneralNames from.
	* @exception IOException on error.
	*/
	public GeneralNames(DerValue derVal) throws IOException {
	this();
	if (derVal.tag != DerValue.tag_Sequence) {
	throw new IOException("Invalid encoding for GeneralNames.");
	}
	if (derVal.data.available() == 0) {
	throw new IOException("No data available in "
	+ "passed DER encoded value.");
	}
	// Decode all the GeneralName's
	while (derVal.data.available() != 0) {
	DerValue encName = derVal.data.getDerValue();

	GeneralName name = new GeneralName(encName);
	add(name);
	}
	}

	/**
	* The default constructor for this class.
	*/
	public GeneralNames() {
	names = new ArrayList<GeneralName>();
	}

	public GeneralNames add(GeneralName name) {
	if (name == null) {
	throw new NullPointerException();
	}
	names.add(name);
	return this;
	}

	public GeneralName get(int index) {
	return names.get(index);
	}

	public boolean isEmpty() {
	return names.isEmpty();
	}

	public int size() {
	return names.size();
	}

	public Iterator<GeneralName> iterator() {
	return names.iterator();
	}

	public List<GeneralName> names() {
	return names;
	}

	/**
	* Write the extension to the DerOutputStream.
	*
	* @param out the DerOutputStream to write the extension to.
	* @exception IOException on error.
	*/
	public void encode(DerOutputStream out) throws IOException {
	if (isEmpty()) {
	return;
	}

	DerOutputStream temp = new DerOutputStream();
	for (GeneralName gn : names) {
	gn.encode(temp);
	}
	out.write(DerValue.tag_Sequence, temp);
	}

	/**
	* compare this GeneralNames to other object for equality
	*
	* @return true if this equals obj
	*/
	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}
	if (obj instanceof GeneralNames == false) {
	return false;
	}
	GeneralNames other = (GeneralNames)obj;
	return this.names.equals(other.names);
	}

	public int hashCode() {
	return names.hashCode();
	}

	public String toString() {
	return names.toString();
	}

	}

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