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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, startinag 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 {
/**
* Checks if a message key exists.
*
* @param key
* @return boolean true if key exists, false otherwise.
*/
boolean hasKey(String key);
/**
* 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
