com.github.dandelion.datatables.jsp.i18n.JstlMessageResolver Maven / Gradle / Ivy
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/*
* [The "BSD licence"]
* Copyright (c) 2012 Dandelion
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Dandelion nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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package com.github.dandelion.datatables.jsp.i18n;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.jstl.fmt.LocalizationContext;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.taglibs.standard.tag.common.fmt.BundleSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.github.dandelion.datatables.core.i18n.AbstractMessageResolver;
import com.github.dandelion.datatables.core.i18n.MessageResolver;
import com.github.dandelion.datatables.core.util.StringUtils;
import com.github.dandelion.datatables.jsp.tag.ColumnTag;
/**
*
* JSTL implementation of the {@link MessageResolver}.
*
* It will make the titleKey attribute of the {@link ColumnTag}
* works the same as the key property of the
* <fmt:message> tag.
*
* @author Thibault Duchateau
* @since 0.9.0
*/
public class JstlMessageResolver extends AbstractMessageResolver {
public JstlMessageResolver(HttpServletRequest request) {
super(request);
}
// Logger
private static Logger logger = LoggerFactory.getLogger(JstlMessageResolver.class);
public String getResource(String messageKey, String defaultValue, Object... params) {
Tag tag = null;
PageContext pageContext = null;
String message = null;
ResourceBundle bundle = null;
LocalizationContext localizationContext = null;
// I'm so ashamed about that...
tag = (Tag) params[0];
pageContext = (PageContext) params[1];
Tag t = TagSupport.findAncestorWithClass(tag, BundleSupport.class);
if (t != null) {
// use resource bundle from parent tag
BundleSupport parent = (BundleSupport) t;
localizationContext = parent.getLocalizationContext();
} else {
localizationContext = BundleSupport.getLocalizationContext(pageContext);
}
if (localizationContext != null) {
bundle = localizationContext.getResourceBundle();
}
if (bundle != null) {
if (messageKey == null || StringUtils.isBlank(messageKey) && StringUtils.isNotBlank(defaultValue)) {
message = StringUtils.capitalize(defaultValue);
} else {
try {
message = bundle.getString(messageKey);
} catch (MissingResourceException e) {
logger.warn("No message found with the key The message key {} and locale {}.", messageKey,
localizationContext.getLocale());
if (StringUtils.isBlank(message)) {
message = UNDEFINED_KEY + messageKey + UNDEFINED_KEY;
}
}
}
}
else{
logger.warn("The bundle hasn't been retrieved. Please check your i18n configuration.");
message = UNDEFINED_KEY + messageKey + UNDEFINED_KEY;
}
return message;
}
}