sun.util.resources.BreakIteratorResourceBundle Maven / Gradle / Ivy
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/*
* Copyright (c) 2016, 2021, 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
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*/
package sun.util.resources;
import java.io.InputStream;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Collections;
import java.util.Enumeration;
import java.util.ResourceBundle;
import java.util.Set;
/**
* BreakIteratorResourceBundle is an abstract class for loading BreakIterator
* data (rules or dictionary) from each module. An implementation class must
* implement getBreakIteratorInfo() that returns an instance of the
* corresponding BreakIteratorInfo (basename). The data name is taken from the
* BreakIteratorInfo instance.
*
* For example, if the given key is "WordDictionary" and Locale is "th", the
* data name is taken from a BreakIteratorInfo_th and the key's value is
* "thai_dict". Its data thai_dict is loaded from the Module of the
* implementation class of this class.
*/
public abstract class BreakIteratorResourceBundle extends ResourceBundle {
// If any keys that are not for data names are added to BreakIteratorInfo*,
// those keys must be added to NON_DATA_KEYS.
private static final Set NON_DATA_KEYS = Set.of("BreakIteratorClasses");
private volatile Set keys;
/**
* Returns an instance of the corresponding {@code BreakIteratorInfo} (basename).
* The instance shouldn't have its parent.
*/
protected abstract ResourceBundle getBreakIteratorInfo();
@Override
protected Object handleGetObject(String key) {
if (NON_DATA_KEYS.contains(key)) {
return null;
}
ResourceBundle info = getBreakIteratorInfo();
if (!info.containsKey(key)) {
return null;
}
String path = getClass().getPackageName().replace('.', '/')
+ '/' + info.getString(key);
byte[] data;
try (InputStream is = getResourceAsStream(path)) {
data = is.readAllBytes();
} catch (Exception e) {
throw new InternalError("Can't load " + path, e);
}
return data;
}
@SuppressWarnings("removal")
private InputStream getResourceAsStream(String path) throws Exception {
PrivilegedExceptionAction pa;
pa = () -> getClass().getModule().getResourceAsStream(path);
InputStream is;
try {
is = AccessController.doPrivileged(pa);
} catch (PrivilegedActionException e) {
throw e.getException();
}
return is;
}
@Override
public Enumeration getKeys() {
return Collections.enumeration(keySet());
}
@Override
protected Set handleKeySet() {
if (keys == null) {
ResourceBundle info = getBreakIteratorInfo();
Set k = info.keySet();
k.removeAll(NON_DATA_KEYS);
synchronized (this) {
if (keys == null) {
keys = k;
}
}
}
return keys;
}
}