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XWork is an command-pattern framework that is used to power WebWork as well as other applications. XWork provides an Inversion of Control container, a powerful expression language, data type conversion, validation, and pluggable configuration.
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/*
 * Copyright (c) 2002-2006 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.xwork2;

import com.opensymphony.xwork2.util.ValueStack;

import java.util.List;
import java.util.ResourceBundle;


/**
 * Provides access to {@link ResourceBundle}s and their underlying text messages.
 * Implementing classes can delegate {@link TextProviderSupport}. Messages will be
 * searched in multiple resource bundles, starting with the one associated with
 * this particular class (action in most cases), continuing to try the message
 * bundle associated with each superclass as well. It will stop once a bundle is
 * found that contains the given text. This gives a cascading style that allow
 * global texts to be defined for an application base class.
 * 
 * You can override {@link LocaleProvider#getLocale()} to change the behaviour of how
 * to choose locale for the bundles that are returned. Typically you would
 * use the {@link LocaleProvider} interface to get the users configured locale.
 *
 * @author Jason Carreira
 * @author Rainer Hermanns
 * @see LocaleProvider
 * @see TextProviderSupport
 */
public interface TextProvider {

    /**
     * Gets a message based on a message key, or null if no message is found.
     *
     * @param key the resource bundle key that is to be searched for
     * @return the message as found in the resource bundle, or null if none is found.
     */
    String getText(String key);

    /**
     * Gets a message based on a key, or, if the message is not found, a supplied
     * default value is returned.
     *
     * @param key          the resource bundle key that is to be searched for
     * @param defaultValue the default value which will be returned if no message is found
     * @return the message as found in the resource bundle, or defaultValue if none is found
     */
    String getText(String key, String defaultValue);

    /**
     * Gets a message based on a key using the supplied obj, as defined in
     * {@link java.text.MessageFormat}, or, if the message is not found, a supplied
     * default value is returned.
     *
     * @param key          the resource bundle key that is to be searched for
     * @param defaultValue the default value which will be returned if no message is found
     * @param obj          obj to be used in a {@link java.text.MessageFormat} message
     * @return the message as found in the resource bundle, or defaultValue if none is found
     */
    String getText(String key, String defaultValue, String obj);

    /**
     * Gets a message based on a key using the supplied args, as defined in
     * {@link java.text.MessageFormat}, or null if no message is found.
     *
     * @param key  the resource bundle key that is to be searched for
     * @param args a list args to be used in a {@link java.text.MessageFormat} message
     * @return the message as found in the resource bundle, or null if none is found.
     */
    String getText(String key, List args);
    /**
     * Gets a message based on a key using the supplied args, as defined in
     * {@link java.text.MessageFormat}, or null if no message is found.
     *
     * @param key  the resource bundle key that is to be searched for
     * @param args an array args to be used in a {@link java.text.MessageFormat} message
     * @return the message as found in the resource bundle, or null if none is found.
     */
    String getText(String key, String[] args);

    /**
     * Gets a message based on a key using the supplied args, as defined in
     * {@link java.text.MessageFormat}, or, if the message is not found, a supplied
     * default value is returned.
     *
     * @param key          the resource bundle key that is to be searched for
     * @param defaultValue the default value which will be returned if no message is found
     * @param args         a list args to be used in a {@link java.text.MessageFormat} message
     * @return the message as found in the resource bundle, or defaultValue if none is found
     */
    String getText(String key, String defaultValue, List args);

    /**
     * Gets a message based on a key using the supplied args, as defined in
     * {@link java.text.MessageFormat}, or, if the message is not found, a supplied
     * default value is returned.
     *
     * @param key          the resource bundle key that is to be searched for
     * @param defaultValue the default value which will be returned if no message is found
     * @param args         an array args to be used in a {@link java.text.MessageFormat} message
     * @return the message as found in the resource bundle, or defaultValue if none is found
     */
    String getText(String key, String defaultValue, String[] args);

    /**
     * Gets a message based on a key using the supplied args, as defined in
     * {@link java.text.MessageFormat}, or, if the message is not found, a supplied
     * default value is returned. Instead of using the value stack in the ActionContext
     * this version of the getText() method uses the provided value stack.
     *
     * @param key          the resource bundle key that is to be searched for
     * @param defaultValue the default value which will be returned if no message is found
     * @param args         a list args to be used in a {@link java.text.MessageFormat} message
     * @param stack        the value stack to use for finding the text
     * @return the message as found in the resource bundle, or defaultValue if none is found
     */
    String getText(String key, String defaultValue, List args, ValueStack stack);

    /**
     * Gets a message based on a key using the supplied args, as defined in
     * {@link java.text.MessageFormat}, or, if the message is not found, a supplied
     * default value is returned. Instead of using the value stack in the ActionContext
     * this version of the getText() method uses the provided value stack.
     *
     * @param key          the resource bundle key that is to be searched for
     * @param defaultValue the default value which will be returned if no message is found
     * @param args         an array args to be used in a {@link java.text.MessageFormat} message
     * @param stack        the value stack to use for finding the text
     * @return the message as found in the resource bundle, or defaultValue if none is found
     */
    String getText(String key, String defaultValue, String[] args, ValueStack stack);

    /**
     * Get the named bundle, such as "com/acme/Foo".
     *
     * @param bundleName the name of the resource bundle, such as "com/acme/Foo"
     */
    ResourceBundle getTexts(String bundleName);

    /**
     * Get the resource bundle associated with the implementing class (usually an action).
     */
    ResourceBundle getTexts();
}