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International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
/*
*******************************************************************************
*
* Copyright (C) 1996-2014, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
*
* CollationLoader.java, ported from ucol_res.cpp
*
* created by: Markus W. Scherer
*/
package com.ibm.icu.impl.coll;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.MissingResourceException;
import com.ibm.icu.impl.ICUResourceBundle;
import com.ibm.icu.util.ICUUncheckedIOException;
import com.ibm.icu.util.Output;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.UResourceBundle;
/**
* Convenience string denoting the Collation data tree
*/
public final class CollationLoader {
// not implemented, all methods are static
private CollationLoader() {
}
private static volatile String rootRules = null;
private static void loadRootRules() {
if (rootRules != null) {
return;
}
synchronized(CollationLoader.class) {
if (rootRules == null) {
UResourceBundle rootBundle = UResourceBundle.getBundleInstance(
ICUResourceBundle.ICU_COLLATION_BASE_NAME, ULocale.ROOT);
rootRules = rootBundle.getString("UCARules");
}
}
}
// C++: static void appendRootRules(UnicodeString &s)
public static String getRootRules() {
loadRootRules();
return rootRules;
}
static String loadRules(ULocale locale, CharSequence collationType) {
UResourceBundle bundle = UResourceBundle.getBundleInstance(
ICUResourceBundle.ICU_COLLATION_BASE_NAME, locale);
UResourceBundle data = ((ICUResourceBundle)bundle).getWithFallback("collations/" + collationType);
String rules = data.getString("Sequence");
return rules;
}
private static final UResourceBundle getWithFallback(UResourceBundle table, String entryName) {
try {
return ((ICUResourceBundle)table).getWithFallback(entryName);
} catch(MissingResourceException e) {
return null;
}
}
public static CollationTailoring loadTailoring(ULocale locale, Output outValidLocale) {
// Java porting note: ICU4J getWithFallback/getStringWithFallback currently does not
// work well when alias table is involved in a resource path, unless full path is specified.
// For now, collation resources does not contain such data, so the code below should work fine.
CollationTailoring root = CollationRoot.getRoot();
String localeName = locale.getName();
if (localeName.length() == 0 || localeName.equals("root")) {
outValidLocale.value = ULocale.ROOT;
return root;
}
UResourceBundle bundle = null;
try {
bundle = UResourceBundle.getBundleInstance(
ICUResourceBundle.ICU_COLLATION_BASE_NAME, locale);
} catch (MissingResourceException e) {
outValidLocale.value = ULocale.ROOT;
return root;
}
ULocale validLocale = bundle.getULocale();
// Normalize the root locale. See
// http://bugs.icu-project.org/trac/ticket/10715
String validLocaleName = validLocale.getName();
if (validLocaleName.length() == 0 || validLocaleName.equals("root")) {
validLocale = ULocale.ROOT;
}
outValidLocale.value = validLocale;
// There are zero or more tailorings in the collations table.
UResourceBundle collations;
try {
collations = ((ICUResourceBundle)bundle).get("collations");
if (collations == null) {
return root;
}
} catch(MissingResourceException ignored) {
return root;
}
// Fetch the collation type from the locale ID and the default type from the data.
String type = locale.getKeywordValue("collation");
String defaultType = "standard";
try {
String defT = ((ICUResourceBundle)collations).getStringWithFallback("default");
if (defT != null) {
defaultType = defT;
}
} catch(MissingResourceException ignored) {
}
if (type == null || type.equals("default")) {
type = defaultType;
}
// Load the collations/type tailoring, with type fallback.
// Java porting note: typeFallback is used for setting U_USING_DEFAULT_WARNING in
// ICU4C, but not used by ICU4J
// boolean typeFallback = false;
UResourceBundle data = getWithFallback(collations, type);
if (data == null &&
type.length() > 6 && type.startsWith("search")) {
// fall back from something like "searchjl" to "search"
// typeFallback = true;
type = "search";
data = getWithFallback(collations, type);
}
if (data == null && !type.equals(defaultType)) {
// fall back to the default type
// typeFallback = true;
type = defaultType;
data = getWithFallback(collations, type);
}
if (data == null && !type.equals("standard")) {
// fall back to the "standard" type
// typeFallback = true;
type = "standard";
data = getWithFallback(collations, type);
}
if (data == null) {
return root;
}
// Is this the same as the root collator? If so, then use that instead.
ULocale actualLocale = data.getULocale();
// http://bugs.icu-project.org/trac/ticket/10715 ICUResourceBundle(root).getULocale() != ULocale.ROOT
// Therefore not just if (actualLocale.equals(ULocale.ROOT) && type.equals("standard")) {
String actualLocaleName = actualLocale.getName();
if (actualLocaleName.length() == 0 || actualLocaleName.equals("root")) {
actualLocale = ULocale.ROOT;
if (type.equals("standard")) {
return root;
}
}
CollationTailoring t = new CollationTailoring(root.settings);
t.actualLocale = actualLocale;
// deserialize
UResourceBundle binary = ((ICUResourceBundle)data).get("%%CollationBin");
byte[] inBytes = binary.getBinary(null);
ByteArrayInputStream inStream = new ByteArrayInputStream(inBytes);
try {
CollationDataReader.read(root, inStream, t);
} catch (IOException e) {
throw new ICUUncheckedIOException("Failed to load collation tailoring data for locale:"
+ actualLocale + " type:" + type, e);
} // No need to close BAIS.
// Try to fetch the optional rules string.
try {
String s = ((ICUResourceBundle)data).getString("Sequence");
if (s != null) {
t.rules = s;
}
} catch(MissingResourceException ignored) {
}
// Set the collation types on the informational locales,
// except when they match the default types (for brevity and backwards compatibility).
// For the valid locale, suppress the default type.
if (!type.equals(defaultType)) {
outValidLocale.value = validLocale.setKeywordValue("collation", type);
}
// For the actual locale, suppress the default type *according to the actual locale*.
// For example, zh has default=pinyin and contains all of the Chinese tailorings.
// zh_Hant has default=stroke but has no other data.
// For the valid locale "zh_Hant" we need to suppress stroke.
// For the actual locale "zh" we need to suppress pinyin instead.
if (!actualLocale.equals(validLocale)) {
// Opening a bundle for the actual locale should always succeed.
UResourceBundle actualBundle = UResourceBundle.getBundleInstance(
ICUResourceBundle.ICU_COLLATION_BASE_NAME, actualLocale);
try {
String defT = ((ICUResourceBundle)actualBundle).getStringWithFallback("collations/default");
if (defT != null) {
defaultType = defT;
}
} catch(MissingResourceException ignored) {
}
}
if (!type.equals(defaultType)) {
t.actualLocale = t.actualLocale.setKeywordValue("collation", type);
}
// if (typeFallback) {
// ICU4C implementation sets U_USING_DEFAULT_WARNING here
// }
return t;
}
}