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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   *
   * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
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   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
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  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
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  * Licensed under the Apache License, Version 2.0 (the "License");
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  */
 
 package org.apache.tomcat.util.res;
 
 import java.util.*;

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.

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(s):
James Duncan Davidson [duncan@eng.sun.com]
James Todd [gonzo@eng.sun.com]
Mel Martinez [mmartinez@g1440.com]
Version:
$Revision: 1.3.6.1 $ $Date: 2008/04/17 18:38:19 $
See also:
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.

Parameters:
packageName Name of package to create StringManager for.
    private StringManager(String packageName) {
	thispackageName, Locale.getDefault() );
    }
    private StringManager(String packageName,Locale loc) {
        String bundleName = packageName + ".LocalStrings";
        try {
             = ResourceBundle.getBundle(bundleName,loc);
        } catchMissingResourceException ex ) {
            = ResourceBundle.getBundlebundleName.);
        }
    }
    private StringManager(ResourceBundle bundle )
    {
	this.=bundle;
    }

    
Get a string from the underlying resource bundle or return null if the String is not found.

Parameters:
key to desired resource String
Returns:
resource String matching key from underlying bundle or null if not found.
Throws:
java.lang.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 = null;
        try{
	        str = .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.

Parameters:
key
args
    public String getString(String keyObject[] 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
            if(args==null){
                args = new Object[1];
            }
            
            Object[] nonNullArgs = args;
            for (int i=0; i<args.lengthi++) {
                if (args[i] == null) {
                    if (nonNullArgs==args){
                        nonNullArgs=(Object[])args.clone();
                    }
                    nonNullArgs[i] = "null";
                }
            }
            ifvalue==null ) value=key;
            iString = MessageFormat.format(valuenonNullArgs);
        } catch (IllegalArgumentException iae) {
            StringBuffer buf = new StringBuffer();
            buf.append(value);
            for (int i = 0; i < args.lengthi++) {
                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.

Parameters:
key
arg
    public String getString(String keyObject arg) {
	Object[] args = new Object[] {arg};
	return getString(keyargs);
    }

    
Get a string from the underlying resource bundle and format it with the given object arguments. These arguments can of course be String objects.

Parameters:
key
arg1
arg2
    public String getString(String keyObject arg1Object arg2) {
	Object[] args = new Object[] {arg1arg2};
	return getString(keyargs);
    }
    
    
Get a string from the underlying resource bundle and format it with the given object arguments. These arguments can of course be String objects.

Parameters:
key
arg1
arg2
arg3
    public String getString(String keyObject arg1Object arg2,
			    Object arg3) {
	Object[] args = new Object[] {arg1arg2arg3};
	return getString(keyargs);
    }

    
Get a string from the underlying resource bundle and format it with the given object arguments. These arguments can of course be String objects.

Parameters:
key
arg1
arg2
arg3
arg4
    public String getString(String keyObject arg1Object arg2,
			    Object arg3Object arg4) {
	Object[] args = new Object[] {arg1arg2arg3arg4};
	return getString(keyargs);
    }
    // --------------------------------------------------------------
    // 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.

Parameters:
packageName
    public synchronized static StringManager getManager(String packageName) {
      StringManager mgr = (StringManager).get(packageName);
      if (mgr == null) {
          mgr = new StringManager(packageName);
          .put(packageNamemgr);
      }
      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.

Parameters:
packageName
    public synchronized static StringManager getManager(ResourceBundle bundle) {
      return new StringManagerbundle );
    }

    
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.

Parameters:
packageName
   public synchronized static StringManager getManager(String packageName,Locale loc) {
      StringManager mgr = (StringManager).get(packageName+"_"+loc.toString());
      if (mgr == null) {
          mgr = new StringManager(packageName,loc);
          .put(packageName+"_"+loc.toString(), mgr);
      }
      return mgr;
    }
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