com.google.gwt.i18n.client

Class Dictionary

java.lang.Object

com.google.gwt.i18n.client.Dictionary

public final class Dictionary
extends java.lang.Object

Provides dynamic string lookup of key/value string pairs defined in a module's host HTML page. Each unique instance of Dictionary is bound to a named JavaScript object that resides in the global namespace of the host page's window object. The bound JavaScript object is used directly as an associative array.

For example, suppose you define the following JavaScript object in your host page:

var CurrentTheme = {
  highlightColor: "#FFFFFF",
  shadowColor: "#808080",
  errorColor: "#FF0000",
  errorIconSrc: "stopsign.gif"
};

You can then use a Dictionary to access the key/value pairs above:

public void useThemeDictionary() {
  Dictionary theme = Dictionary.getDictionary("CurrentTheme");

  String highlightColor = theme.get("highlightColor");
  String shadowColor = theme.get("shadowColor");
  applyShadowStyle(highlightColor, shadowColor);

  String errorColor = theme.get("errorColor");
  String errorIconSrc = theme.get("errorIconSrc");
  Image errorImg = new Image(errorIconSrc);
  showError(errorColor, errorImg);
}

Unlike the family of interfaces that extend Localizable which support static internationalization, the Dictionary class is fully dynamic. As a result, a variety of error conditions (particularly those involving key mismatches) cannot be caught until runtime. Similarly, the GWT compiler is unable discard unused dictionary values since the structure cannot be statically analyzed.

A Caveat Regarding Locale

The module's host page completely determines the mappings defined for each dictionary without regard to the locale client property. Thus, Dictionary is the most flexible of the internationalization types and may provide the simplest form of integration with existing localization systems which were not specifically designed to use GWT's locale client property.

See Localizable for background on the locale client property.

Required Module

Modules that use this interface should inherit com.google.gwt.i18n.I18N.

<module>
  <!-- other inherited modules, such as com.google.gwt.user.User -->
  <inherits name="com.google.gwt.i18n.I18N"/>
  <!-- additional module settings -->
</module>

Method Summary

Modifier and Type	Method and Description
java.lang.String	get(java.lang.String key) Get the value associated with the given Dictionary key.
static Dictionary	getDictionary(java.lang.String name) Returns the Dictionary object associated with the given name.
java.util.Set<java.lang.String>	keySet() The set of keys associated with this dictionary.
(package private) void	resourceError(java.lang.String key)
(package private) static void	resourceErrorBadType(java.lang.String name)
java.lang.String	toString()
java.util.Collection<java.lang.String>	values() Collection of values associated with this dictionary.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

getDictionary

public static Dictionary getDictionary(java.lang.String name)

Returns the Dictionary object associated with the given name.

Parameters:

name -

Returns:

specified dictionary

Throws:

java.util.MissingResourceException

resourceErrorBadType

static void resourceErrorBadType(java.lang.String name)

get

public java.lang.String get(java.lang.String key)

Get the value associated with the given Dictionary key. We have to call Object.hasOwnProperty to verify that the value is defined on this object, rather than a superclass, since normal Object properties are also visible on this object.

Parameters:

key - to lookup

Returns:

the value

Throws:

java.util.MissingResourceException - if the value is not found

keySet

public java.util.Set<java.lang.String> keySet()

The set of keys associated with this dictionary.

Returns:

the Dictionary set

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

values

public java.util.Collection<java.lang.String> values()

Collection of values associated with this dictionary.

Returns:

the values

resourceError

void resourceError(java.lang.String key)