org.glassfish.grizzly.http.util.StringManager Maven / Gradle / Ivy
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package org.glassfish.grizzly.http.util;
import java.text.MessageFormat;
import java.util.*;
/**
* An internationalization / localization helper class which reduces
* the bother of handling ResourceBundles and takes care of the
* common cases of message formatting which otherwise require the
* creation of Object arrays and such.
*
* The StringManager operates on a package basis. One StringManager
* per package can be created and accessed via the getManager method
* call.
*
* 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.
*
* Please see the documentation for java.util.ResourceBundle for
* more information.
*
* @author James Duncan Davidson [[email protected]]
* @author James Todd [[email protected]]
* @author Mel Martinez [[email protected]]
* @version $Revision: 1.2 $ $Date: 2005/12/08 01:29:37 $
* @see java.util.ResourceBundle
*/
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, ClassLoader loader) {
this(packageName, Locale.getDefault(), loader);
}
private StringManager(String packageName, Locale loc, ClassLoader loader) {
String bundleName = packageName + ".LocalStrings";
try {
bundle = ResourceBundle.getBundle(bundleName, loc, loader);
} catch (MissingResourceException ex) {
bundle = ResourceBundle.getBundle(bundleName, Locale.US, loader);
}
}
private StringManager(ResourceBundle bundle) {
this.bundle = bundle;
}
/**
* Get a string from the underlying resource bundle or return
* null if the String is not found.
*
* @param key to desired resource String
* @return resource String matching key from underlying
* bundle or null if not found.
* @throws IllegalArgumentException if key is null.
*/
public String getString(String key) {
if (key == null) {
String msg = "key may not have a null value";
throw new IllegalArgumentException(msg);
}
String str;
try {
str = bundle.getString(key);
} catch (MissingResourceException mre) {
//bad: shouldn't mask an exception the following way:
// str = "[cannot find message associated with key '" + key + "' due to " + mre + "]";
// because it hides the fact that the String was missing
// from the calling code.
//good: could just throw the exception (or wrap it in another)
// but that would probably cause much havoc on existing
// code.
//better: consistent with container pattern to
// simply return null. Calling code can then do
// a null check.
str = null;
}
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;
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
if (args == null) {
args = new Object[1];
}
Object[] nonNullArgs = args;
for (int i = 0; i < args.length; i++) {
if (args[i] == null) {
if (nonNullArgs == args) {
nonNullArgs = args.clone();
}
nonNullArgs[i] = "null";
}
}
if (value == null) value = key;
iString = MessageFormat.format(value, nonNullArgs);
} catch (IllegalArgumentException iae) {
StringBuilder buf = new StringBuilder();
buf.append(value);
for (int i = 0; i < args.length; i++) {
buf.append(" arg[").append(i).append("]=").append(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 final Map managers =
new HashMap();
/**
* 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,
ClassLoader loader) {
StringManager mgr = managers.get(packageName);
if (mgr == null) {
mgr = new StringManager(packageName, loader);
managers.put(packageName, mgr);
}
return mgr;
}
/**
* 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 bundle
*/
public synchronized static StringManager getManager(ResourceBundle bundle) {
return new StringManager(bundle);
}
/**
* Get the StringManager for a particular package and Locale. If a manager for
* a package already exists, it will be reused, else a new
* StringManager will be created for that Locale and returned.
*
* @param packageName
*/
public synchronized static StringManager getManager(String packageName,
Locale loc,
ClassLoader loader) {
StringManager mgr = managers.get(packageName + '_' + loc.toString());
if (mgr == null) {
mgr = new StringManager(packageName, loc, loader);
managers.put(packageName + '_' + loc.toString(), mgr);
}
return mgr;
}
}