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Struts example source code file (TextProviderSupport.java)

This example Struts source code file (TextProviderSupport.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

arraylist, class, list, locale, locale, localeprovider, object, object, resourcebundle, string, string, textprovidersupport, textprovidersupport, util, valuestack

The Struts TextProviderSupport.java source code

/*
 * Copyright 2002-2006,2009 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.opensymphony.xwork2;

import com.opensymphony.xwork2.util.LocalizedTextUtil;
import com.opensymphony.xwork2.util.ValueStack;

import java.util.*;


/**
 * Default TextProvider implementation.
 *
 * @author Jason Carreira
 * @author Rainer Hermanns
 */
public class TextProviderSupport implements ResourceBundleTextProvider {

    private Class clazz;
    private LocaleProvider localeProvider;
    private ResourceBundle bundle;

    /**
     * Default constructor
     */
    public TextProviderSupport() {
    }

    /**
     * Constructor.
     *
     * @param clazz    a clazz to use for reading the resource bundle.
     * @param provider a locale provider.
     */
    public TextProviderSupport(Class clazz, LocaleProvider provider) {
        this.clazz = clazz;
        this.localeProvider = provider;
    }

    /**
     * Constructor.
     *
     * @param bundle   the resource bundle.
     * @param provider a locale provider.
     */
    public TextProviderSupport(ResourceBundle bundle, LocaleProvider provider) {
        this.bundle = bundle;
        this.localeProvider = provider;
    }

    /**
     * @param bundle the resource bundle.
     */
    public void setBundle(ResourceBundle bundle) {
        this.bundle = bundle;
    }

    /**
     * @param clazz a clazz to use for reading the resource bundle.
     */
    public void setClazz(Class clazz) {
        this.clazz = clazz;
    }


    /**
     * @param localeProvider a locale provider.
     */
    public void setLocaleProvider(LocaleProvider localeProvider) {
        this.localeProvider = localeProvider;
    }


    /**
     * Checks if a key is available in the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * 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.
     */
    public boolean hasKey(String key) {
    	String message;
    	if (clazz != null) {
            message =  LocalizedTextUtil.findText(clazz, key, getLocale(), null, new Object[0] );
        } else {
            message = LocalizedTextUtil.findText(bundle, key, getLocale(), null, new Object[0]);
        }
    	return message != null;
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * 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.
     *
     * @param key name of text to be found
     * @return value of named text
     */
    public String getText(String key) {
        return getText(key, key, Collections.emptyList());
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * 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. If no text is found for this text name, the default value is returned.
     *
     * @param key    name of text to be found
     * @param defaultValue the default value which will be returned if no text is found
     * @return value of named text
     */
    public String getText(String key, String defaultValue) {
        return getText(key, defaultValue, Collections.emptyList());
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * 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. If no text is found for this text name, the default value is returned.
     *
     * @param key    name of text to be found
     * @param defaultValue the default value which will be returned if no text is found
     * @return value of named text
     */
    public String getText(String key, String defaultValue, String arg) {
        List<Object> args = new ArrayList();
        args.add(arg);
        return getText(key, defaultValue, args);
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * 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. If no text is found for this text name, the default value is returned.
     *
     * @param key name of text to be found
     * @param args      a List of args to be used in a MessageFormat message
     * @return value of named text
     */
    public String getText(String key, List<?> args) {
        return getText(key, key, args);
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * 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. If no text is found for this text name, the default value is returned.
     *
     * @param key name of text to be found
     * @param args      an array of args to be used in a MessageFormat message
     * @return value of named text
     */
    public String getText(String key, String[] args) {
        return getText(key, key, args);
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * 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. If no text is found for this text name, the default value is returned.
     *
     * @param key    name of text to be found
     * @param defaultValue the default value which will be returned if no text is found
     * @param args         a List of args to be used in a MessageFormat message
     * @return value of named text
     */
    public String getText(String key, String defaultValue, List<?> args) {
        Object[] argsArray = ((args != null && !args.equals(Collections.emptyList())) ? args.toArray() : null);
        if (clazz != null) {
            return LocalizedTextUtil.findText(clazz, key, getLocale(), defaultValue, argsArray);
        } else {
            return LocalizedTextUtil.findText(bundle, key, getLocale(), defaultValue, argsArray);
        }
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * 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. If no text is found for this text name, the default value is returned.
     *
     * @param key          name of text to be found
     * @param defaultValue the default value which will be returned if no text is found
     * @param args         an array of args to be used in a MessageFormat message
     * @return value of named text
     */
    public String getText(String key, String defaultValue, String[] args) {
        if (clazz != null) {
            return LocalizedTextUtil.findText(clazz, key, getLocale(), defaultValue, args);
        } else {
            return LocalizedTextUtil.findText(bundle, key, getLocale(), defaultValue, 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
     */
    public String getText(String key, String defaultValue, List<?> args, ValueStack stack) {
        Object[] argsArray = ((args != null) ? args.toArray() : null);
        Locale locale;
        if (stack == null){
        	locale = getLocale();
        }else{
        	locale = (Locale) stack.getContext().get(ActionContext.LOCALE);
        }
        if (locale == null) {
            locale = getLocale();
        }
        if (clazz != null) {
            return LocalizedTextUtil.findText(clazz, key, locale, defaultValue, argsArray, stack);
        } else {
            return LocalizedTextUtil.findText(bundle, key, locale, defaultValue, argsArray, 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
     */
    public String getText(String key, String defaultValue, String[] args, ValueStack stack) {
        Locale locale;
        if (stack == null){
        	locale = getLocale();
        }else{
        	locale = (Locale) stack.getContext().get(ActionContext.LOCALE);
        }
        if (locale == null) {
            locale = getLocale();
        }
        if (clazz != null) {
            return LocalizedTextUtil.findText(clazz, key, locale, defaultValue, args, stack);
        } else {
            return LocalizedTextUtil.findText(bundle, key, locale, defaultValue, args, stack);
        }

    }

    /**
     * Get the named bundle.
     * <p/>
     * You can override the getLocale() methodName to change the behaviour of how
     * to choose locale for the bundles that are returned. Typically you would
     * use the TextProvider interface to get the users configured locale, or use
     * your own methodName to allow the user to select the locale and store it in
     * the session (by using the SessionAware interface).
     *
     * @param aBundleName bundle name
     * @return a resource bundle
     */
    public ResourceBundle getTexts(String aBundleName) {
        return LocalizedTextUtil.findResourceBundle(aBundleName, getLocale());
    }

    /**
     * Get the resource bundle associated with this action.
     * This will be based on the actual subclass that is used.
     *
     * @return resouce bundle
     */
    public ResourceBundle getTexts() {
        if (clazz != null) {
            return getTexts(clazz.getName());
        }
        return bundle;
    }

    /**
     * Get's the locale from the localeProvider.
     *
     * @return the locale from the localeProvider.
     */
    private Locale getLocale() {
        return localeProvider.getLocale();
    }
}

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