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/*
* Copyright (c) 2018, 2022, 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.
*
* 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.
*/
/*
* @test
* @bug 8204938 8242010
* @summary Checks the IANA language subtag registry data update
* with Locale.LanguageRange parse method.
* @run main LSRDataTest
*/
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Locale;
import java.util.Locale.LanguageRange;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.Locale.LanguageRange.MAX_WEIGHT;
import static java.util.Locale.LanguageRange.MIN_WEIGHT;
public class LSRDataTest {
private static final char HYPHEN = '-';
private static final Map<String, String> singleLangEquivMap = new HashMap<>();
private static final Map<String, List<String>> multiLangEquivsMap = new HashMap<>();
private static final Map<String, String> regionVariantEquivMap = new HashMap<>();
// path to the lsr file from the data folder, this test relies on the
// relative path to the file in the data folder, considering
// test and src/.../data will always exist in the same jdk layout
private static final String LSR_FILE_PATH = System.getProperty("test.src", ".")
+ "/../../../../../src/java.base/share/data/lsrdata/language-subtag-registry.txt";
public static void main(String[] args) throws IOException {
loadLSRData(Paths.get(LSR_FILE_PATH).toRealPath());
// checking the tags with weight
String ranges = "Accept-Language: aam, adp, aue, bcg, cqu, ema,"
+ " en-gb-oed, gti, koj, kwq, kxe, lii, lmm, mtm, ngv,"
+ " oyb, phr, pub, suj, taj;q=0.9, yug;q=0.5, gfx;q=0.4";
List<LanguageRange> expected = parse(ranges);
List<LanguageRange> actual = LanguageRange.parse(ranges);
checkEquality(actual, expected);
// checking all language ranges
ranges = generateLangRanges();
expected = parse(ranges);
actual = LanguageRange.parse(ranges);
checkEquality(actual, expected);
// checking all region/variant ranges
ranges = generateRegionRanges();
expected = parse(ranges);
actual = LanguageRange.parse(ranges);
checkEquality(actual, expected);
}
// generate range string containing all equiv language tags
private static String generateLangRanges() {
return Stream.concat(singleLangEquivMap.keySet().stream(), multiLangEquivsMap
.keySet().stream()).collect(Collectors.joining(","));
}
// generate range string containing all equiv region tags
private static String generateRegionRanges() {
return regionVariantEquivMap.keySet().stream()
.map(r -> "en".concat(r)).collect(Collectors.joining(", "));
}
// load LSR data from the file
private static void loadLSRData(Path path) throws IOException {
String type = null;
String tag = null;
String preferred = null;
String prefix = null;
for (String line : Files.readAllLines(path, Charset.forName("UTF-8"))) {
line = line.toLowerCase(Locale.ROOT);
int index = line.indexOf(' ') + 1;
if (line.startsWith("type:")) {
type = line.substring(index);
} else if (line.startsWith("tag:") || line.startsWith("subtag:")) {
tag = line.substring(index);
} else if (line.startsWith("preferred-value:")) {
preferred = line.substring(index);
} else if (line.startsWith("prefix:")) {
prefix = line.substring(index);
} else if (line.equals("%%")) {
processDataAndGenerateMaps(type, tag, preferred, prefix);
type = null;
tag = null;
preferred = null;
prefix = null;
}
}
// Last entry
processDataAndGenerateMaps(type, tag, preferred, prefix);
}
private static void processDataAndGenerateMaps(String type,
String tag,
String preferred,
String prefix) {
if (type == null || tag == null || preferred == null) {
return;
}
if (type.equals("extlang") && prefix != null) {
tag = prefix + "-" + tag;
}
if (type.equals("region") || type.equals("variant")) {
if (!regionVariantEquivMap.containsKey(preferred)) {
String tPref = HYPHEN + preferred;
String tTag = HYPHEN + tag;
regionVariantEquivMap.put(tPref, tTag);
regionVariantEquivMap.put(tTag, tPref);
} else {
throw new RuntimeException("New case, need implementation."
+ " A region/variant subtag \"" + preferred
+ "\" is registered for more than one subtags.");
}
} else { // language, extlang, legacy, and redundant
if (!singleLangEquivMap.containsKey(preferred)
&& !multiLangEquivsMap.containsKey(preferred)) {
// new entry add it into single equiv map
singleLangEquivMap.put(preferred, tag);
singleLangEquivMap.put(tag, preferred);
} else if (singleLangEquivMap.containsKey(preferred)
&& !multiLangEquivsMap.containsKey(preferred)) {
String value = singleLangEquivMap.get(preferred);
List<String> subtags = List.of(preferred, value, tag);
// remove from single eqiv map before adding to multi equiv
singleLangEquivMap.keySet().removeAll(subtags);
addEntriesToMultiEquivsMap(subtags);
} else if (multiLangEquivsMap.containsKey(preferred)
&& !singleLangEquivMap.containsKey(preferred)) {
List<String> subtags = multiLangEquivsMap.get(preferred);
// should use the order preferred, subtags, tag to keep the
// expected order same as the JDK API in multi equivalent maps
subtags.add(0, preferred);
subtags.add(tag);
addEntriesToMultiEquivsMap(subtags);
}
}
}
// Add entries into the multi equivalent map from the given subtags
private static void addEntriesToMultiEquivsMap(List<String> subtags) {
// for each subtag within the given subtags, add an entry in multi
// equivalent language map with subtag as the key and the value
// as the list of all subtags excluding the one which is getting
// traversed
subtags.forEach(subtag -> multiLangEquivsMap.put(subtag, subtags.stream()
.filter(t -> !t.equals(subtag))
.collect(Collectors.toList())));
}
private static List<LanguageRange> parse(String ranges) {
ranges = ranges.replace(" ", "").toLowerCase(Locale.ROOT);
if (ranges.startsWith("accept-language:")) {
ranges = ranges.substring(16);
}
String[] langRanges = ranges.split(",");
List<LanguageRange> priorityList = new ArrayList<>(langRanges.length);
int numOfRanges = 0;
for (String range : langRanges) {
int wIndex = range.indexOf(";q=");
String tag;
double weight = 0.0;
if (wIndex == -1) {
tag = range;
weight = MAX_WEIGHT;
} else {
tag = range.substring(0, wIndex);
try {
weight = Double.parseDouble(range.substring(wIndex + 3));
} catch (RuntimeException ex) {
throw new IllegalArgumentException("weight= " + weight + " for"
+ " language range \"" + tag + "\", should be"
+ " represented as a double");
}
if (weight < MIN_WEIGHT || weight > MAX_WEIGHT) {
throw new IllegalArgumentException("weight=" + weight
+ " for language range \"" + tag
+ "\", must be between " + MIN_WEIGHT
+ " and " + MAX_WEIGHT + ".");
}
}
LanguageRange entry = new LanguageRange(tag, weight);
if (!priorityList.contains(entry)) {
int index = numOfRanges;
// find the index in the list to add the current range at the
// correct index sorted by the descending order of weight
for (int i = 0; i < priorityList.size(); i++) {
if (priorityList.get(i).getWeight() < weight) {
index = i;
break;
}
}
priorityList.add(index, entry);
numOfRanges++;
String equivalent = getEquivalentForRegionAndVariant(tag);
if (equivalent != null) {
LanguageRange equivRange = new LanguageRange(equivalent, weight);
if (!priorityList.contains(equivRange)) {
priorityList.add(index + 1, equivRange);
numOfRanges++;
}
}
List<String> equivalents = getEquivalentsForLanguage(tag);
if (equivalents != null) {
for (String equiv : equivalents) {
LanguageRange equivRange = new LanguageRange(equiv, weight);
if (!priorityList.contains(equivRange)) {
priorityList.add(index + 1, equivRange);
numOfRanges++;
}
equivalent = getEquivalentForRegionAndVariant(equiv);
if (equivalent != null) {
equivRange = new LanguageRange(equivalent, weight);
if (!priorityList.contains(equivRange)) {
priorityList.add(index + 1, equivRange);
numOfRanges++;
}
}
}
}
}
}
return priorityList;
}
/**
* A faster alternative approach to String.replaceFirst(), if the given
* string is a literal String, not a regex.
*/
private static String replaceFirstSubStringMatch(String range,
String substr, String replacement) {
int pos = range.indexOf(substr);
if (pos == -1) {
return range;
} else {
return range.substring(0, pos) + replacement
+ range.substring(pos + substr.length());
}
}
private static List<String> getEquivalentsForLanguage(String range) {
String r = range;
while (r.length() > 0) {
if (singleLangEquivMap.containsKey(r)) {
String equiv = singleLangEquivMap.get(r);
// Return immediately for performance if the first matching
// subtag is found.
return List.of(replaceFirstSubStringMatch(range, r, equiv));
} else if (multiLangEquivsMap.containsKey(r)) {
List<String> equivs = multiLangEquivsMap.get(r);
List<String> result = new ArrayList(equivs.size());
for (int i = 0; i < equivs.size(); i++) {
result.add(i, replaceFirstSubStringMatch(range,
r, equivs.get(i)));
}
return result;
}
// Truncate the last subtag simply.
int index = r.lastIndexOf(HYPHEN);
if (index == -1) {
break;
}
r = r.substring(0, index);
}
return null;
}
private static String getEquivalentForRegionAndVariant(String range) {
int extensionKeyIndex = getExtentionKeyIndex(range);
for (String subtag : regionVariantEquivMap.keySet()) {
int index;
if ((index = range.indexOf(subtag)) != -1) {
// Check if the matching text is a valid region or variant.
if (extensionKeyIndex != Integer.MIN_VALUE
&& index > extensionKeyIndex) {
continue;
}
int len = index + subtag.length();
if (range.length() == len || range.charAt(len) == HYPHEN) {
return replaceFirstSubStringMatch(range, subtag,
regionVariantEquivMap.get(subtag));
}
}
}
return null;
}
private static int getExtentionKeyIndex(String s) {
char[] c = s.toCharArray();
int index = Integer.MIN_VALUE;
for (int i = 1; i < c.length; i++) {
if (c[i] == HYPHEN) {
if (i - index == 2) {
return index;
} else {
index = i;
}
}
}
return Integer.MIN_VALUE;
}
private static void checkEquality(List<LanguageRange> expected,
List<LanguageRange> actual) {
int expectedSize = expected.size();
int actualSize = actual.size();
if (expectedSize != actualSize) {
throw new RuntimeException("[FAILED: Size of the priority list"
+ " does not match, Expected size=" + expectedSize + "]");
} else {
for (int i = 0; i < expectedSize; i++) {
LanguageRange lr1 = expected.get(i);
LanguageRange lr2 = actual.get(i);
if (!lr1.getRange().equals(lr2.getRange())
|| lr1.getWeight() != lr2.getWeight()) {
throw new RuntimeException("[FAILED: Ranges at index "
+ i + " do not match Expected: range=" + lr1.getRange()
+ ", weight=" + lr1.getWeight() + ", Actual: range="
+ lr2.getRange() + ", weight=" + lr2.getWeight() + "]");
}
}
}
}
}
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