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Modern server-side Java template engine for both web and standalone environments
/*
* =============================================================================
*
* Copyright (c) 2011-2018, The THYMELEAF team (http://www.thymeleaf.org)
*
* 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 org.thymeleaf.messageresolver;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import org.thymeleaf.exceptions.TemplateInputException;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.templateresource.ITemplateResource;
import org.thymeleaf.util.StringUtils;
/**
*
* @author Daniel Fernández
*
* @since 3.0.0
*
*/
final class StandardMessageResolutionUtils {
private static final Map EMPTY_MESSAGES = Collections.emptyMap();
private static final String PROPERTIES_FILE_EXTENSION = ".properties";
private static final Object[] EMPTY_MESSAGE_PARAMETERS = new Object[0];
static Map resolveMessagesForTemplate(final ITemplateResource templateResource, final Locale locale) {
// Let the resource tell us about its 'base name'
final String resourceBaseName = templateResource.getBaseName();
if (resourceBaseName == null || resourceBaseName.length() == 0) {
// No way to compute base name -> no messages
return EMPTY_MESSAGES;
}
// Compute all the resource names we should use: *_gl_ES-gheada.properties, *_gl_ES.properties, _gl.properties...
// The order here is important: as we will let values from more specific files overwrite those in less specific,
// (e.g. a value for gl_ES will have more precedence than a value for gl). So we will iterate these resource
// names from less specific to more specific.
final List messageResourceNames = computeMessageResourceNamesFromBase(resourceBaseName, locale);
// Build the combined messages
Map combinedMessages = null;
for (final String messageResourceName : messageResourceNames) {
try {
final ITemplateResource messageResource = templateResource.relative(messageResourceName);
final Reader messageResourceReader = messageResource.reader();
if (messageResourceReader != null) {
final Properties messageProperties = readMessagesResource(messageResourceReader);
if (messageProperties != null && !messageProperties.isEmpty()) {
if (combinedMessages == null) {
combinedMessages = new HashMap(20);
}
for (final Map.Entry propertyEntry : messageProperties.entrySet()) {
combinedMessages.put((String)propertyEntry.getKey(), (String)propertyEntry.getValue());
}
}
}
} catch (final IOException ignored) {
// File might not exist, simply try the next one
}
}
if (combinedMessages == null) {
return EMPTY_MESSAGES;
}
return Collections.unmodifiableMap(combinedMessages);
}
static Map resolveMessagesForOrigin(final Class origin, final Locale locale) {
final Map combinedMessages = new HashMap(20);
Class currentClass = origin;
combinedMessages.putAll(resolveMessagesForSpecificClass(currentClass, locale));
while (!currentClass.getSuperclass().equals(Object.class)) {
currentClass = currentClass.getSuperclass();
final Map messagesForCurrentClass = resolveMessagesForSpecificClass(currentClass, locale);
for (final String messageKey : messagesForCurrentClass.keySet()) {
if (!combinedMessages.containsKey(messageKey)) {
combinedMessages.put(messageKey, messagesForCurrentClass.get(messageKey));
}
}
}
return Collections.unmodifiableMap(combinedMessages);
}
private static Map resolveMessagesForSpecificClass(final Class originClass, final Locale locale) {
final ClassLoader originClassLoader = originClass.getClassLoader();
final String originClassName = originClass.getName();
final String resourceBaseName = StringUtils.replace(originClassName, ".", "/");
// Compute all the resource names we should use: *_gl_ES-gheada.properties, *_gl_ES.properties, _gl.properties...
// The order here is important: as we will let values from more specific files overwrite those in less specific,
// (e.g. a value for gl_ES will have more precedence than a value for gl). So we will iterate these resource
// names from less specific to more specific.
final List messageResourceNames = computeMessageResourceNamesFromBase(resourceBaseName, locale);
// Build the combined messages
Map combinedMessages = null;
for (final String messageResourceName : messageResourceNames) {
final InputStream inputStream = originClassLoader.getResourceAsStream(messageResourceName);
if (inputStream != null) {
// At this point we cannot be specified a character encoding (that's only for template resolution),
// so we will use the standard character encoding for .properties files, which is ISO-8859-1
// (see Properties#load(InputStream) javadoc).
final InputStreamReader messageResourceReader = new InputStreamReader(inputStream);
final Properties messageProperties = readMessagesResource(messageResourceReader);
if (messageProperties != null && !messageProperties.isEmpty()) {
if (combinedMessages == null) {
combinedMessages = new HashMap(20);
}
for (final Map.Entry propertyEntry : messageProperties.entrySet()) {
combinedMessages.put((String)propertyEntry.getKey(), (String)propertyEntry.getValue());
}
}
}
}
if (combinedMessages == null) {
return EMPTY_MESSAGES;
}
return Collections.unmodifiableMap(combinedMessages);
}
private static List computeMessageResourceNamesFromBase(
final String resourceBaseName, final Locale locale) {
final List resourceNames = new ArrayList(5);
if (StringUtils.isEmptyOrWhitespace(locale.getLanguage())) {
throw new TemplateProcessingException(
"Locale \"" + locale.toString() + "\" " +
"cannot be used as it does not specify a language.");
}
resourceNames.add(resourceBaseName + PROPERTIES_FILE_EXTENSION);
resourceNames.add(resourceBaseName + "_" + locale.getLanguage() + PROPERTIES_FILE_EXTENSION);
if (!StringUtils.isEmptyOrWhitespace(locale.getCountry())) {
resourceNames.add(
resourceBaseName + "_" + locale.getLanguage() + "_" + locale.getCountry() + PROPERTIES_FILE_EXTENSION);
}
if (!StringUtils.isEmptyOrWhitespace(locale.getVariant())) {
resourceNames.add(
resourceBaseName + "_" + locale.getLanguage() + "_" + locale.getCountry() + "-" + locale.getVariant() + PROPERTIES_FILE_EXTENSION);
}
return resourceNames;
}
private static Properties readMessagesResource(final Reader propertiesReader) {
if (propertiesReader == null) {
return null;
}
final Properties properties = new Properties();
try {
// Note Properties#load(Reader) this is JavaSE 6 specific, but Thymeleaf 3.0 does
// not support Java 5 anymore...
properties.load(propertiesReader);
} catch (final Exception e) {
throw new TemplateInputException("Exception loading messages file", e);
} finally {
try {
propertiesReader.close();
} catch (final Throwable ignored) {
// ignore errors closing
}
}
return properties;
}
static String formatMessage(final Locale locale, final String message, final Object[] messageParameters) {
if (message == null) {
return null;
}
if (!isFormatCandidate(message)) { // trying to avoid creating MessageFormat if not needed
return message;
}
final MessageFormat messageFormat = new MessageFormat(message, locale);
return messageFormat.format((messageParameters != null? messageParameters : EMPTY_MESSAGE_PARAMETERS));
}
/*
* This will allow us determine whether a message might actually contain parameter placeholders.
*/
private static boolean isFormatCandidate(final String message) {
char c;
int n = message.length();
while (n-- != 0) {
c = message.charAt(n);
if (c == '}' || c == '\'') {
return true;
}
}
return false;
}
private StandardMessageResolutionUtils() {
super();
}
}
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