/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.harmony.luni.util;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
// BEGIN android-added
import java.lang.ref.SoftReference;
import java.util.HashMap;
import java.util.logging.Logger;
// END android-added
// BEGIN android-changed
import wonka.vm.VMStack;
// END android-changed
/**
* This class contains helper methods for loading resource bundles and
* formatting external message strings.
*/
public final class MsgHelp {
// BEGIN android-added
// A HashMap mapping a resource name to a SoftReference to a ResourceBundle
// holding the messages for that resource.
private static HashMap<String, SoftReference<ResourceBundle>> sRefMap = null;
public synchronized static ResourceBundle loadBundle(String resource) {
if (sRefMap == null) {
sRefMap = new HashMap<String, SoftReference<ResourceBundle>>();
}
SoftReference<ResourceBundle> bundleRef = sRefMap.get(resource);
if (bundleRef == null || bundleRef.get() == null) {
// Attempt to load the messages.
try {
ResourceBundle bundle = setLocale(Locale.getDefault(),
resource);
bundleRef = new SoftReference<ResourceBundle>(bundle);
sRefMap.put(resource, bundleRef);
return bundle;
} catch (Throwable e) {
Logger.global.warning("Got Throwable " + e +
" loading messages");
return null;
}
} else {
return bundleRef.get();
}
}
public static String getString(String resource, String msg) {
ResourceBundle bundle = MsgHelp.loadBundle(resource);
if (bundle == null) {
return msg;
}
try {
return bundle.getString(msg);
} catch (MissingResourceException e) {
return "Missing message: " + msg; // $NON_NLS-1$
}
}
static public String getString(String resource, String msg, Object[] args) {
String format = msg;
ResourceBundle bundle = MsgHelp.loadBundle(resource);
if (bundle != null) {
try {
format = bundle.getString(msg);
} catch (MissingResourceException e) {
}
}
return format(format, args);
}
// END android-added
/**
* Generates a formatted text string given a source string containing
* "argument markers" of the form "{argNum}" where each argNum must be in
* the range 0..9. The result is generated by inserting the toString of each
* argument into the position indicated in the string.
* <p>
* To insert the "{" character into the output, use a single backslash
* character to escape it (i.e. "\{"). The "}" character does not need to be
* escaped.
*
* @param format
* String the format to use when printing.
* @param args
* Object[] the arguments to use.
* @return String the formatted message.
*/
public static String format(String format, Object[] args) {
StringBuilder answer = new StringBuilder(format.length()
+ (args.length * 20));
String[] argStrings = new String[args.length];
for (int i = 0; i < args.length; ++i) {
if (args[i] == null)
argStrings[i] = "<null>";
else
argStrings[i] = args[i].toString();
}
int lastI = 0;
for (int i = format.indexOf('{', 0); i >= 0; i = format.indexOf('{',
lastI)) {
if (i != 0 && format.charAt(i - 1) == '\\') {
// It's escaped, just print and loop.
if (i != 1)
answer.append(format.substring(lastI, i - 1));
answer.append('{');
lastI = i + 1;
} else {
// It's a format character.
if (i > format.length() - 3) {
// Bad format, just print and loop.
answer.append(format.substring(lastI, format.length()));
lastI = format.length();
} else {
int argnum = (byte) Character.digit(format.charAt(i + 1),
10);
if (argnum < 0 || format.charAt(i + 2) != '}') {
// Bad format, just print and loop.
answer.append(format.substring(lastI, i + 1));
lastI = i + 1;
} else {
// Got a good one!
answer.append(format.substring(lastI, i));
if (argnum >= argStrings.length)
answer.append("<missing argument>");
else
answer.append(argStrings[argnum]);
lastI = i + 3;
}
}
}
}
if (lastI < format.length())
answer.append(format.substring(lastI, format.length()));
return answer.toString();
}
/**
* Changes the locale of the messages.
*
* @param locale
* Locale the locale to change to.
* @param resource
* the name of the bundle resource
*/
static public ResourceBundle setLocale(final Locale locale,
final String resource) {
try {
// BEGIN android-removed
// final ClassLoader loader = VM.bootCallerClassLoader();
// END android-removed
return (ResourceBundle) AccessController
.doPrivileged(new PrivilegedAction<Object>() {
public Object run() {
// BEGIN android-changed
return ResourceBundle.getBundle(resource, locale,
ClassLoader.getSystemClassLoader());
// END android-changed
}
});
} catch (MissingResourceException e) {
}
return null;
}
}