/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.shindig.gadgets.render;
import java.io.IOException;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.shindig.common.util.ResourceLoader;
import org.apache.shindig.common.xml.DomUtil;
import org.apache.shindig.gadgets.Gadget;
import org.apache.shindig.gadgets.GadgetException;
import org.apache.shindig.gadgets.http.HttpResponse;
import org.apache.shindig.gadgets.rewrite.GadgetRewriter;
import org.apache.shindig.gadgets.rewrite.MutableContent;
import org.apache.shindig.gadgets.rewrite.RewritingException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* Produce data constants that are needed by the opensocial-i18n
* feature based on user locale.
*/
public class OpenSocialI18NGadgetRewriter implements GadgetRewriter {
private static final String I18N_FEATURE_NAME = "opensocial-i18n";
private static final String DATA_PATH = "features/i18n/data/";
private Map<Locale, String> i18nConstantsCache = new ConcurrentHashMap<Locale, String>();
public void rewrite(Gadget gadget, MutableContent mutableContent) throws RewritingException {
// Don't touch sanitized gadgets.
if (gadget.sanitizeOutput()) {
return;
}
// Quickly return if opensocial-i18n feature is not needed.
if (!gadget.getAllFeatures().contains(I18N_FEATURE_NAME)) {
return;
}
try {
Document document = mutableContent.getDocument();
Element head = (Element)DomUtil.getFirstNamedChildNode(document.getDocumentElement(), "head");
injectI18NConstants(gadget, head);
mutableContent.documentChanged();
} catch (GadgetException e) {
throw new RewritingException(e, e.getHttpStatusCode());
}
}
private void injectI18NConstants(Gadget gadget, Node headTag) throws GadgetException {
StringBuilder inlineJs = new StringBuilder();
Locale locale = gadget.getContext().getLocale();
if (i18nConstantsCache.containsKey(locale)) {
inlineJs.append(i18nConstantsCache.get(locale));
} else {
// load gadgets.i18n.DateTimeConstants and gadgets.i18n.NumberFormatConstants
String localeName = getLocaleNameForLoadingI18NConstants(locale);
String dateTimeConstantsResource = "DateTimeConstants__" + localeName + ".js";
String numberConstantsResource = "NumberFormatConstants__" + localeName + ".js";
try {
inlineJs.append(ResourceLoader.getContent(dateTimeConstantsResource))
.append('\n').append(ResourceLoader.getContent(numberConstantsResource));
i18nConstantsCache.put(locale, inlineJs.toString());
} catch (IOException e) {
throw new GadgetException(GadgetException.Code.INVALID_CONFIG,
"Unexpected inability to load i18n data for locale: " + localeName,
HttpResponse.SC_INTERNAL_SERVER_ERROR);
}
}
Element inlineTag = headTag.getOwnerDocument().createElement("script");
headTag.appendChild(inlineTag);
inlineTag.appendChild(headTag.getOwnerDocument().createTextNode(inlineJs.toString()));
}
String getLocaleNameForLoadingI18NConstants(Locale locale) {
String localeName = "en";
String language = locale.getLanguage();
String country = locale.getCountry();
if (!language.equalsIgnoreCase("ALL")) {
try {
attemptToLoadResource(language);
localeName = language;
} catch (IOException e) { }
}
if (!country.equalsIgnoreCase("ALL")) {
try {
attemptToLoadResource(localeName + '_' + country);
localeName += '_' + country;
} catch (IOException e) { }
}
return localeName;
}
protected String attemptToLoadResource(String localeName) throws IOException {
return ResourceLoader.getContent(DATA_PATH
+ "DateTimeConstants__" + localeName
+ ".js");
}
}