projectresourcebundle.java

Java有关XML编程需要用到axis 的源代码 把里面bin下的包导入相应的Java工程 进行使用

     *        It must be a proper prefix of the caller's package.
     * 
     * @param caller The calling class.
     *        This is used to get the package name to further construct
     *        the basename as well as to get the proper ClassLoader.
     * 
     * @param resourceName The name of the resource without the
     *        ".properties" extension
     * 
     * @param locale The locale
     * 
     * @param extendsBundle If non-null, then this ExtendMessages will
     *         default to extendsBundle.
     * 
     * @throws MissingResourceException if projectName is not a prefix of
     *         the caller's package name, or if the resource could not be
     *         found/loaded.
     */
    public static ProjectResourceBundle getBundle(String projectName,
                                                  String packageName,
                                                  String resourceName,
                                                  Locale locale,
                                                  ClassLoader loader,
                                                  ResourceBundle extendsBundle)
        throws MissingResourceException
    {
        if (log.isDebugEnabled()) {
            log.debug("getBundle(" + projectName + ","
                                   + packageName + ","
                                   + resourceName + ","
                                   + String.valueOf(locale) + ",...)");
        }
        
        Context context = new Context();
        context.setLocale(locale);
        context.setLoader(loader);
        context.setProjectName(projectName);
        context.setResourceName(resourceName);
        context.setParentBundle(extendsBundle);

        packageName = context.validate(packageName);

        ProjectResourceBundle bundle = null;
        try {
            bundle = getBundle(context, packageName);
        } catch (RuntimeException e) {
            log.debug("Exception: ", e);
            throw e;
        }
        
        if (bundle == null) {
            throw new MissingResourceException("Cannot find resource '" +
                                               packageName + '.' + resourceName + "'",
                                               resourceName, "");
        }
        
        return bundle;
    }

    /**
     * get bundle...
     * - check cache
     * - try up hierarchy
     * - if at top of hierarchy, use (link to) context.getParentBundle()
     */
    private static synchronized ProjectResourceBundle getBundle(Context context, String packageName)
        throws MissingResourceException
    {
        String cacheKey = context.getCacheKey(packageName);
        
        ProjectResourceBundle prb = (ProjectResourceBundle)bundleCache.get(cacheKey);

        if (prb == null) {
            String name = packageName + '.' + context.getResourceName();
            ResourceBundle rb = context.loadBundle(packageName);
            ResourceBundle parent = context.getParentBundle(packageName);
            
            if (rb != null) {
                prb = new ProjectResourceBundle(name, rb);
                prb.setParent(parent);
                if (log.isDebugEnabled()) {
                    log.debug("Created " + prb + ", linked to parent " + String.valueOf(parent));
                }
            } else {
                if (parent != null) {
                    if (parent instanceof ProjectResourceBundle) {
                        prb = (ProjectResourceBundle)parent;
                    } else {
                        prb = new ProjectResourceBundle(name, parent);
                    }
                    if (log.isDebugEnabled()) {
                        log.debug("Root package not found, cross link to " + parent);
                    }
                }
            }

            if (prb != null) {
                // Cache the resource
                bundleCache.put(cacheKey, prb);
            }
        }

        return prb;
    }

    private static final String getPackage(String name) {
        return name.substring(0, name.lastIndexOf('.')).intern();
    }
    
    /**
      * Construct a new ProjectResourceBundle
      */
    private ProjectResourceBundle(String name, ResourceBundle bundle)
        throws MissingResourceException
    {
        this.resourceBundle = bundle;
        this.resourceName = name;
    }
    
    public String getResourceName() {
        return resourceName;
    }

    /**
     * Clears the internal cache
     */
    public static void clearCache()
    {
        bundleCache.clear();
    }
    
    public String toString() {
        return resourceName;
    }


    private static class Context {
        private Locale _locale;
        private ClassLoader _loader;
        private String _projectName;
        private String _resourceName;
        private ResourceBundle _parent;
        
        void setLocale(Locale l) {
            /* 1. Docs indicate that if locale is not specified,
             *    then the default local is used in it's place.
             * 2. A null value for locale is invalid.
             * 
             * Therefore, default...
             */
            _locale = (l == null) ? defaultLocale : l;
        }

        void setLoader(ClassLoader l) {
            _loader = (l != null) ? l : this.getClass().getClassLoader();
            // START FIX: http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16868
            if (_loader == null) {
                _loader = ClassLoader.getSystemClassLoader();
            }
            // END FIX: http://nagoya.apache.org/bugzilla/show_bug.cgi?id=16868
        }
        
        void setProjectName(String name) { _projectName = name.intern(); }
        void setResourceName(String name) { _resourceName = name.intern(); }
        void setParentBundle(ResourceBundle b) { _parent = b; }
        
        Locale getLocale() { return _locale; }
        ClassLoader getLoader() { return _loader; }
        String getProjectName() { return _projectName; }
        String getResourceName() { return _resourceName; }
        ResourceBundle getParentBundle() { return _parent; }
    
        String getCacheKey(String packageName)
        {
            String loaderName = (_loader == null) ? "" : (":" + _loader.hashCode());
            return packageName + "." + _resourceName + ":" + _locale + ":" + defaultLocale + loaderName;
        }

        ResourceBundle loadBundle(String packageName)
        {
            try {
                return ResourceBundle.getBundle(packageName + '.' + _resourceName,
                                                _locale,
                                                _loader);
            } catch (MissingResourceException e) {
                // Deliberately surpressing print stack.. just the string for info.
                log.debug("loadBundle: Ignoring MissingResourceException: " + e.getMessage());
            }
            return null;
        }
    
        ResourceBundle getParentBundle(String packageName)
        {
            ResourceBundle p;
            if (packageName != _projectName) {
                p = getBundle(this, getPackage(packageName));
            } else {
                p = _parent;
                _parent = null;
            }
            return p;
        }
        
        String validate(String packageName)
            throws MissingResourceException
        {
            if (_projectName == null  ||  _projectName.length() == 0) {
                log.debug("Project name not specified");
                throw new MissingResourceException("Project name not specified",
                                                   "", "");
            }

            if (packageName == null  ||  packageName.length() == 0) {
                log.debug("Package name not specified");
                throw new MissingResourceException("Package not specified",
                                                   packageName, "");
            }
            packageName = packageName.intern();
    
            /* Ensure that project is a proper prefix of class.
             * Terminate project name with '.' to ensure proper match.
             */
            if (packageName != _projectName  &&  !packageName.startsWith(_projectName + '.')) {
                log.debug("Project not a prefix of Package");
                throw new MissingResourceException("Project '" + _projectName
                                 + "' must be a prefix of Package '"
                                 + packageName + "'",
                                 packageName + '.' + _resourceName, "");
            }
                
            return packageName;
        }
    }
}