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	/*
	* Copyright (c) 2012, 2015, 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 javax.net.ssl;

	import java.util.Arrays;

	/**
	* Instances of this class represent a server name in a Server Name
	* Indication (SNI) extension.
	* <P>
	* The SNI extension is a feature that extends the SSL/TLS/DTLS protocols to
	* indicate what server name the client is attempting to connect to during
	* handshaking. See section 3, "Server Name Indication", of <A
	* HREF="http://www.ietf.org/rfc/rfc6066.txt">TLS Extensions (RFC 6066)</A>.
	* <P>
	* {@code SNIServerName} objects are immutable. Subclasses should not provide
	* methods that can change the state of an instance once it has been created.
	*
	* @see SSLParameters#getServerNames()
	* @see SSLParameters#setServerNames(List)
	*
	* @since 1.8
	*/
	public abstract class SNIServerName {

	// the type of the server name
	private final int type;

	// the encoded value of the server name
	private final byte[] encoded;

	// the hex digitals
	private static final char[] HEXES = "0123456789ABCDEF".toCharArray();

	/**
	* Creates an {@code SNIServerName} using the specified name type and
	* encoded value.
	* <P>
	* Note that the {@code encoded} byte array is cloned to protect against
	* subsequent modification.
	*
	* @param type
	* the type of the server name
	* @param encoded
	* the encoded value of the server name
	*
	* @throws IllegalArgumentException if {@code type} is not in the range
	* of 0 to 255, inclusive.
	* @throws NullPointerException if {@code encoded} is null
	*/
	protected SNIServerName(int type, byte[] encoded) {
	if (type < 0) {
	throw new IllegalArgumentException(
	"Server name type cannot be less than zero");
	} else if (type > 255) {
	throw new IllegalArgumentException(
	"Server name type cannot be greater than 255");
	}
	this.type = type;

	if (encoded == null) {
	throw new NullPointerException(
	"Server name encoded value cannot be null");
	}
	this.encoded = encoded.clone();
	}


	/**
	* Returns the name type of this server name.
	*
	* @return the name type of this server name
	*/
	public final int getType() {
	return type;
	}

	/**
	* Returns a copy of the encoded server name value of this server name.
	*
	* @return a copy of the encoded server name value of this server name
	*/
	public final byte[] getEncoded() {
	return encoded.clone();
	}

	/**
	* Indicates whether some other object is "equal to" this server name.
	*
	* @return true if, and only if, {@code other} is of the same class
	* of this object, and has the same name type and
	* encoded value as this server name.
	*/
	@Override
	public boolean equals(Object other) {
	if (this == other) {
	return true;
	}

	if (this.getClass() != other.getClass()) {
	return false;
	}

	SNIServerName that = (SNIServerName)other;
	return (this.type == that.type) &&
	Arrays.equals(this.encoded, that.encoded);
	}

	/**
	* Returns a hash code value for this server name.
	* <P>
	* The hash code value is generated using the name type and encoded
	* value of this server name.
	*
	* @return a hash code value for this server name.
	*/
	@Override
	public int hashCode() {
	int result = 17; // 17/31: prime number to decrease collisions
	result = 31 * result + type;
	result = 31 * result + Arrays.hashCode(encoded);

	return result;
	}

	/**
	* Returns a string representation of this server name, including the server
	* name type and the encoded server name value in this
	* {@code SNIServerName} object.
	* <P>
	* The exact details of the representation are unspecified and subject
	* to change, but the following may be regarded as typical:
	* <pre>
	* "type={@literal <name type>}, value={@literal <name value>}"
	* </pre>
	* <P>
	* In this class, the format of "{@literal <name type>}" is
	* "[LITERAL] (INTEGER)", where the optional "LITERAL" is the literal
	* name, and INTEGER is the integer value of the name type. The format
	* of "{@literal <name value>}" is "XX:...:XX", where "XX" is the
	* hexadecimal digit representation of a byte value. For example, a
	* returned value of an pseudo server name may look like:
	* <pre>
	* "type=(31), value=77:77:77:2E:65:78:61:6D:70:6C:65:2E:63:6E"
	* </pre>
	* or
	* <pre>
	* "type=host_name (0), value=77:77:77:2E:65:78:61:6D:70:6C:65:2E:63:6E"
	* </pre>
	*
	* <P>
	* Please NOTE that the exact details of the representation are unspecified
	* and subject to change, and subclasses may override the method with
	* their own formats.
	*
	* @return a string representation of this server name
	*/
	@Override
	public String toString() {
	if (type == StandardConstants.SNI_HOST_NAME) {
	return "type=host_name (0), value=" + toHexString(encoded);
	} else {
	return "type=(" + type + "), value=" + toHexString(encoded);
	}
	}

	// convert byte array to hex string
	private static String toHexString(byte[] bytes) {
	if (bytes.length == 0) {
	return "(empty)";
	}

	StringBuilder sb = new StringBuilder(bytes.length * 3 - 1);
	boolean isInitial = true;
	for (byte b : bytes) {
	if (isInitial) {
	isInitial = false;
	} else {
	sb.append(':');
	}

	int k = b & 0xFF;
	sb.append(HEXES[k >>> 4]);
	sb.append(HEXES[k & 0xF]);
	}

	return sb.toString();
	}
	}

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