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package org.apache.naming;
import java.text.MessageFormat;
import java.util.Hashtable;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
/**
* An internationalization / localization helper class which reduces
* the bother of handling ResourceBundles and takes care of the
* common cases of message formating which otherwise require the
* creation of Object arrays and such.
*
* <p>The StringManager operates on a package basis. One StringManager
* per package can be created and accessed via the getManager method
* call.
*
* <p>The StringManager will look for a ResourceBundle named by
* the package name given plus the suffix of "LocalStrings". In
* practice, this means that the localized information will be contained
* in a LocalStrings.properties file located in the package
* directory of the classpath.
*
* <p>Please see the documentation for java.util.ResourceBundle for
* more information.
*
* @author James Duncan Davidson [duncan@eng.sun.com]
* @author James Todd [gonzo@eng.sun.com]
*/
public class StringManager {
/**
* The ResourceBundle for this StringManager.
*/
private ResourceBundle bundle;
/**
* Creates a new StringManager for a given package. This is a
* private method and all access to it is arbitrated by the
* static getManager method call so that only one StringManager
* per package will be created.
*
* @param packageName Name of package to create StringManager for.
*/
private StringManager(String packageName) {
String bundleName = packageName + ".LocalStrings";
bundle = ResourceBundle.getBundle(bundleName);
}
/**
* Get a string from the underlying resource bundle.
*
* @param key
*/
public String getString(String key) {
if (key == null) {
String msg = "key is null";
throw new NullPointerException(msg);
}
String str = null;
try {
str = bundle.getString(key);
} catch (MissingResourceException mre) {
str = "Cannot find message associated with key '" + key + "'";
}
return str;
}
/**
* Get a string from the underlying resource bundle and format
* it with the given set of arguments.
*
* @param key
* @param args
*/
public String getString(String key, Object[] args) {
String iString = null;
String value = getString(key);
// this check for the runtime exception is some pre 1.1.6
// VM's don't do an automatic toString() on the passed in
// objects and barf out
try {
// ensure the arguments are not null so pre 1.2 VM's don't barf
Object nonNullArgs[] = args;
for (int i=0; i<args.length; i++) {
if (args[i] == null) {
if (nonNullArgs==args) nonNullArgs=(Object[])args.clone();
nonNullArgs[i] = "null";
}
}
iString = MessageFormat.format(value, nonNullArgs);
} catch (IllegalArgumentException iae) {
StringBuffer buf = new StringBuffer();
buf.append(value);
for (int i = 0; i < args.length; i++) {
buf.append(" arg[" + i + "]=" + args[i]);
}
iString = buf.toString();
}
return iString;
}
/**
* Get a string from the underlying resource bundle and format it
* with the given object argument. This argument can of course be
* a String object.
*
* @param key
* @param arg
*/
public String getString(String key, Object arg) {
Object[] args = new Object[] {arg};
return getString(key, args);
}
/**
* Get a string from the underlying resource bundle and format it
* with the given object arguments. These arguments can of course
* be String objects.
*
* @param key
* @param arg1
* @param arg2
*/
public String getString(String key, Object arg1, Object arg2) {
Object[] args = new Object[] {arg1, arg2};
return getString(key, args);
}
/**
* Get a string from the underlying resource bundle and format it
* with the given object arguments. These arguments can of course
* be String objects.
*
* @param key
* @param arg1
* @param arg2
* @param arg3
*/
public String getString(String key, Object arg1, Object arg2,
Object arg3) {
Object[] args = new Object[] {arg1, arg2, arg3};
return getString(key, args);
}
/**
* Get a string from the underlying resource bundle and format it
* with the given object arguments. These arguments can of course
* be String objects.
*
* @param key
* @param arg1
* @param arg2
* @param arg3
* @param arg4
*/
public String getString(String key, Object arg1, Object arg2,
Object arg3, Object arg4) {
Object[] args = new Object[] {arg1, arg2, arg3, arg4};
return getString(key, args);
}
// --------------------------------------------------------------
// STATIC SUPPORT METHODS
// --------------------------------------------------------------
private static Hashtable managers = new Hashtable();
/**
* Get the StringManager for a particular package. If a manager for
* a package already exists, it will be reused, else a new
* StringManager will be created and returned.
*
* @param packageName
*/
public synchronized static StringManager getManager(String packageName) {
StringManager mgr = (StringManager)managers.get(packageName);
if (mgr == null) {
mgr = new StringManager(packageName);
managers.put(packageName, mgr);
}
return mgr;
}
}
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