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package javax.accessibility;

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import sun.awt.AWTAccessor;


Base class used to maintain a strongly typed enumeration. This is the superclass of AccessibleState and AccessibleRole. 
 The toDisplayString() method allows you to obtain the localized string for a locale independent key from a predefined ResourceBundle for the keys defined in this class. This localized string is intended to be readable by humans. 
Author:Willie Walker, Peter Korn, Lynn Monsanto
See Also:
/**
 * Base class used to maintain a strongly typed enumeration. This is the
 * superclass of {@link AccessibleState} and {@link AccessibleRole}.
 * <p>
 * The {@link #toDisplayString()} method allows you to obtain the localized
 * string for a locale independent key from a predefined {@code ResourceBundle}
 * for the keys defined in this class. This localized string is intended to be
 * readable by humans.
 *
 * @author Willie Walker
 * @author Peter Korn
 * @author Lynn Monsanto
 * @see AccessibleRole
 * @see AccessibleState
 */
public abstract class AccessibleBundle {

    private static Hashtable<Locale, Hashtable<String, Object>> table = new Hashtable<>();

    private final String defaultResourceBundleName
        = "com.sun.accessibility.internal.resources.accessibility";

    static {
        AWTAccessor.setAccessibleBundleAccessor(
                new AWTAccessor.AccessibleBundleAccessor() {

                    @Override
                    public String getKey(AccessibleBundle accessibleBundle) {
                        return accessibleBundle.key;
                    }
                });
    }

    
Construct an AccessibleBundle. 
/**
     * Construct an {@code AccessibleBundle}.
     */
    public AccessibleBundle() {
    }

    
The locale independent name of the state. This is a programmatic name
that is not intended to be read by humans.

See Also:
  • toDisplayString
/**
     * The locale independent name of the state. This is a programmatic name
     * that is not intended to be read by humans.
     *
     * @see #toDisplayString
     */
    protected String key = null;

    
Obtains the key as a localized string. If a localized string cannot be
found for the key, the locale independent key stored in the role will be
returned. This method is intended to be used only by subclasses so that
they can specify their own resource bundles which contain localized
strings for their keys.

Params:
  • resourceBundleName – the name of the resource bundle to use for
        lookup
  • locale – the locale for which to obtain a localized string
Returns:a localized string for the key
/**
     * Obtains the key as a localized string. If a localized string cannot be
     * found for the key, the locale independent key stored in the role will be
     * returned. This method is intended to be used only by subclasses so that
     * they can specify their own resource bundles which contain localized
     * strings for their keys.
     *
     * @param  resourceBundleName the name of the resource bundle to use for
     *         lookup
     * @param  locale the locale for which to obtain a localized string
     * @return a localized string for the key
     */
    protected String toDisplayString(String resourceBundleName,
                                     Locale locale) {

        // loads the resource bundle if necessary
        loadResourceBundle(resourceBundleName, locale);

        // returns the localized string
        Hashtable<String, Object> ht = table.get(locale);
        if (ht != null) {
            Object o = ht.get(key);
            if (o != null && o instanceof String) {
                return (String)o;
            }
        }
        return key;
    }

    
Obtains the key as a localized string. If a localized string cannot be
found for the key, the locale independent key stored in the role will be
returned.

Params:
  • locale – the locale for which to obtain a localized string
Returns:a localized string for the key
/**
     * Obtains the key as a localized string. If a localized string cannot be
     * found for the key, the locale independent key stored in the role will be
     * returned.
     *
     * @param  locale the locale for which to obtain a localized string
     * @return a localized string for the key
     */
    public String toDisplayString(Locale locale) {
        return toDisplayString(defaultResourceBundleName, locale);
    }

    
Gets localized string describing the key using the default locale.

Returns:a localized string describing the key using the default locale
/**
     * Gets localized string describing the key using the default locale.
     *
     * @return a localized string describing the key using the default locale
     */
    public String toDisplayString() {
        return toDisplayString(Locale.getDefault());
    }

    
Gets localized string describing the key using the default locale.

See Also:
Returns:a localized string describing the key using the default locale
/**
     * Gets localized string describing the key using the default locale.
     *
     * @return a localized string describing the key using the default locale
     * @see #toDisplayString
     */
    public String toString() {
        return toDisplayString();
    }

    
Loads the Accessibility resource bundle if necessary.

/**
     * Loads the Accessibility resource bundle if necessary.
     */
    private void loadResourceBundle(String resourceBundleName,
                                    Locale locale) {
        if (! table.contains(locale)) {

            try {
                Hashtable<String, Object> resourceTable = new Hashtable<>();

                ResourceBundle bundle = ResourceBundle.getBundle(resourceBundleName, locale);

                Enumeration<String> iter = bundle.getKeys();
                while(iter.hasMoreElements()) {
                    String key = iter.nextElement();
                    resourceTable.put(key, bundle.getObject(key));
                }

                table.put(locale, resourceTable);
            }
            catch (MissingResourceException e) {
                System.err.println("loadResourceBundle: " + e);
                // Just return so toDisplayString() returns the
                // non-localized key.
                return;
            }
        }
    }
}