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	/*
	* Copyright (c) 1999, 2004, 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.misc;

	import java.util.StringTokenizer;
	import java.util.jar.Attributes;
	import java.util.jar.Attributes.Name;
	import java.util.ResourceBundle;
	import java.util.MissingResourceException;
	import java.text.MessageFormat;
	import java.lang.Character.*;


	/**
	* This class holds all necessary information to install or
	* upgrade a extension on the user's disk
	*
	* @author Jerome Dochez
	*/
	public class ExtensionInfo {

	/**
	* <p>
	* public static values returned by the isCompatible method
	* </p>
	*/
	public static final int COMPATIBLE = 0;
	public static final int REQUIRE_SPECIFICATION_UPGRADE = 1;
	public static final int REQUIRE_IMPLEMENTATION_UPGRADE = 2;
	public static final int REQUIRE_VENDOR_SWITCH = 3;
	public static final int INCOMPATIBLE = 4;

	/**
	* <p>
	* attributes fully describer an extension. The underlying described
	* extension may be installed and requested.
	* <p>
	*/
	public String title;
	public String name;
	public String specVersion;
	public String specVendor;
	public String implementationVersion;
	public String vendor;
	public String vendorId;
	public String url;

	// For I18N support
	private static final ResourceBundle rb =
	ResourceBundle.getBundle("sun.misc.resources.Messages");


	/**
	* <p>
	* Create a new uninitialized extension information object
	* </p>
	*/
	public ExtensionInfo() {
	}

	/**
	* <p>
	* Create and initialize an extension information object.
	* The initialization uses the attributes passed as being
	* the content of a manifest file to load the extension
	* information from.
	* Since manifest file may contain information on several
	* extension they may depend on, the extension key parameter
	* is prepanded to the attribute name to make the key used
	* to retrieve the attribute from the manifest file
	* <p>
	* @param extensionKey unique extension key in the manifest
	* @param attr Attributes of a manifest file
	*/
	public ExtensionInfo(String extensionKey, Attributes attr)
	throws NullPointerException
	{
	String s;
	if (extensionKey!=null) {
	s = extensionKey + "-";
	} else {
	s ="";
	}

	String attrKey = s + Name.EXTENSION_NAME.toString();
	name = attr.getValue(attrKey);
	if (name != null)
	name = name.trim();

	attrKey = s + Name.SPECIFICATION_TITLE.toString();
	title = attr.getValue(attrKey);
	if (title != null)
	title = title.trim();

	attrKey = s + Name.SPECIFICATION_VERSION.toString();
	specVersion = attr.getValue(attrKey);
	if (specVersion != null)
	specVersion = specVersion.trim();

	attrKey = s + Name.SPECIFICATION_VENDOR.toString();
	specVendor = attr.getValue(attrKey);
	if (specVendor != null)
	specVendor = specVendor.trim();

	attrKey = s + Name.IMPLEMENTATION_VERSION.toString();
	implementationVersion = attr.getValue(attrKey);
	if (implementationVersion != null)
	implementationVersion = implementationVersion.trim();

	attrKey = s + Name.IMPLEMENTATION_VENDOR.toString();
	vendor = attr.getValue(attrKey);
	if (vendor != null)
	vendor = vendor.trim();

	attrKey = s + Name.IMPLEMENTATION_VENDOR_ID.toString();
	vendorId = attr.getValue(attrKey);
	if (vendorId != null)
	vendorId = vendorId.trim();

	attrKey =s + Name.IMPLEMENTATION_URL.toString();
	url = attr.getValue(attrKey);
	if (url != null)
	url = url.trim();
	}

	/**
	* <p>
	* @return true if the extension described by this extension information
	* is compatible with the extension described by the extension
	* information passed as a parameter
	* </p>
	*
	* @param the requested extension information to compare to
	*/
	public int isCompatibleWith(ExtensionInfo ei) {

	if (name == null \|\| ei.name == null)
	return INCOMPATIBLE;
	if (name.compareTo(ei.name)==0) {
	// is this true, if not spec version is specified, we consider
	// the value as being "any".
	if (specVersion == null \|\| ei.specVersion == null)
	return COMPATIBLE;

	int version = compareExtensionVersion(specVersion, ei.specVersion);
	if (version<0) {
	// this extension specification is "older"
	if (vendorId != null && ei.vendorId !=null) {
	if (vendorId.compareTo(ei.vendorId)!=0) {
	return REQUIRE_VENDOR_SWITCH;
	}
	}
	return REQUIRE_SPECIFICATION_UPGRADE;
	} else {
	// the extension spec is compatible, let's look at the
	// implementation attributes
	if (vendorId != null && ei.vendorId != null) {
	// They care who provides the extension
	if (vendorId.compareTo(ei.vendorId)!=0) {
	// They want to use another vendor implementation
	return REQUIRE_VENDOR_SWITCH;
	} else {
	// Vendor matches, let's see the implementation version
	if (implementationVersion != null && ei.implementationVersion != null) {
	// they care about the implementation version
	version = compareExtensionVersion(implementationVersion, ei.implementationVersion);
	if (version<0) {
	// This extension is an older implementation
	return REQUIRE_IMPLEMENTATION_UPGRADE;
	}
	}
	}
	}
	// All othe cases, we consider the extensions to be compatible
	return COMPATIBLE;
	}
	}
	return INCOMPATIBLE;
	}

	/**
	* <p>
	* helper method to print sensible information on the undelying described
	* extension
	* </p>
	*/
	public String toString() {
	return "Extension : title(" + title + "), name(" + name + "), spec vendor(" +
	specVendor + "), spec version(" + specVersion + "), impl vendor(" +
	vendor + "), impl vendor id(" + vendorId + "), impl version(" +
	implementationVersion + "), impl url(" + url + ")";
	}

	/*
	* <p>
	* helper method to compare two versions.
	* version are in the x.y.z.t pattern.
	* </p>
	* @param source version to compare to
	* @param target version used to compare against
	* @return < 0 if source < version
	* > 0 if source > version
	* = 0 if source = version
	*/
	private int compareExtensionVersion(String source, String target)
	throws NumberFormatException
	{
	source = source.toLowerCase();
	target = target.toLowerCase();

	return strictCompareExtensionVersion(source, target);
	}


	/*
	* <p>
	* helper method to compare two versions.
	* version are in the x.y.z.t pattern.
	* </p>
	* @param source version to compare to
	* @param target version used to compare against
	* @return < 0 if source < version
	* > 0 if source > version
	* = 0 if source = version
	*/
	private int strictCompareExtensionVersion(String source, String target)
	throws NumberFormatException
	{
	if (source.equals(target))
	return 0;

	StringTokenizer stk = new StringTokenizer(source, ".,");
	StringTokenizer ttk = new StringTokenizer(target, ".,");

	// Compare number
	int n = 0, m = 0, result = 0;

	// Convert token into meaning number for comparision
	if (stk.hasMoreTokens())
	n = convertToken(stk.nextToken().toString());

	// Convert token into meaning number for comparision
	if (ttk.hasMoreTokens())
	m = convertToken(ttk.nextToken().toString());

	if (n > m)
	return 1;
	else if (m > n)
	return -1;
	else
	{
	// Look for index of "." in the string
	int sIdx = source.indexOf(".");
	int tIdx = target.indexOf(".");

	if (sIdx == -1)
	sIdx = source.length() - 1;

	if (tIdx == -1)
	tIdx = target.length() - 1;

	return strictCompareExtensionVersion(source.substring(sIdx + 1),
	target.substring(tIdx + 1));
	}
	}

	private int convertToken(String token)
	{
	if (token == null \|\| token.equals(""))
	return 0;

	int charValue = 0;
	int charVersion = 0;
	int patchVersion = 0;
	int strLength = token.length();
	int endIndex = strLength;
	char lastChar;

	Object[] args = {name};
	MessageFormat mf = new MessageFormat(rb.getString("optpkg.versionerror"));
	String versionError = mf.format(args);

	// Look for "-" for pre-release
	int prIndex = token.indexOf("-");

	// Look for "_" for patch release
	int patchIndex = token.indexOf("_");

	if (prIndex == -1 && patchIndex == -1)
	{
	// This is a FCS release
	try {
	return Integer.parseInt(token) * 100;
	} catch (NumberFormatException e) {
	System.out.println(versionError);
	return 0;
	}
	}
	else if (patchIndex != -1)
	{
	// This is a patch (update) release
	int prversion;
	try {
	// Obtain the version
	prversion = Integer.parseInt(token.substring(0, patchIndex));

	// Check to see if the patch version is in the n.n.n_nnl format (special release)
	lastChar = token.charAt(strLength-1);
	if (Character.isLetter(lastChar)) {
	// letters a-z have values from 10-35
	charValue = Character.getNumericValue(lastChar);
	endIndex = strLength-1;

	// Obtain the patch version id
	patchVersion = Integer.parseInt(token.substring(patchIndex+1, endIndex));

	if (charValue >= Character.getNumericValue('a') && charValue <= Character.getNumericValue('z')) {
	// This is a special release
	charVersion = (patchVersion * 100) + charValue;
	} else {
	// character is not a a-z letter, ignore
	charVersion = 0;
	System.out.println(versionError);
	}
	} else {
	// This is a regular update release. Obtain the patch version id
	patchVersion = Integer.parseInt(token.substring(patchIndex+1, endIndex));
	}
	} catch (NumberFormatException e) {
	System.out.println(versionError);
	return 0;
	}
	return prversion * 100 + (patchVersion + charVersion);
	}
	else
	{
	//This is a milestone release, either a early access, alpha, beta, or RC

	// Obtain the version
	int mrversion;
	try {
	mrversion = Integer.parseInt(token.substring(0, prIndex));
	} catch (NumberFormatException e) {
	System.out.println(versionError);
	return 0;
	}

	// Obtain the patch version string, including the milestone + version
	String prString = token.substring(prIndex + 1);

	// Milestone version
	String msVersion = "";
	int delta = 0;

	if (prString.indexOf("ea") != -1)
	{
	msVersion = prString.substring(2);
	delta = 50;
	}
	else if (prString.indexOf("alpha") != -1)
	{
	msVersion = prString.substring(5);
	delta = 40;
	}
	else if (prString.indexOf("beta") != -1)
	{
	msVersion = prString.substring(4);
	delta = 30;
	}
	else if (prString.indexOf("rc") != -1)
	{
	msVersion = prString.substring(2);
	delta = 20;
	}

	if (msVersion == null \|\| msVersion.equals(""))
	{
	// No version after the milestone, assume 0
	return mrversion * 100 - delta ;
	}
	else
	{
	// Convert the milestone version
	try {
	return mrversion * 100 - delta + Integer.parseInt(msVersion);
	} catch (NumberFormatException e) {
	System.out.println(versionError);
	return 0;
	}
	}
	}
	}
	}

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