com.networknt.schema.i18n.ResourceBundleMessageSource Maven / Gradle / Ivy
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/*
* Copyright (c) 2023 the original author or authors.
*
* 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.networknt.schema.i18n;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.Objects;
import java.util.Optional;
import java.util.ResourceBundle;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Supplier;
/**
* {@link MessageSource} that retrieves messages from a {@link ResourceBundle}.
*/
public class ResourceBundleMessageSource implements MessageSource {
/**
* Resource Bundle Cache. baseName -> locale -> resourceBundle.
*/
private Map> resourceBundleMap = new ConcurrentHashMap<>();
/**
* Message Cache. locale -> key -> message.
*/
private Map> messageMap = new ConcurrentHashMap<>();
/**
* Message Format Cache. locale -> message -> messageFormat.
*
* Note that Message Format is not threadsafe.
*/
private Map> messageFormatMap = new ConcurrentHashMap<>();
private final List baseNames;
public ResourceBundleMessageSource(String... baseName) {
this.baseNames = Arrays.asList(baseName);
}
@Override
public String getMessage(String key, Supplier defaultMessage, Locale locale, Object... arguments) {
String message = getMessageFromCache(locale, key);
if (message.isEmpty() && defaultMessage != null) {
message = defaultMessage.get();
}
if (message.isEmpty()) {
// Fallback on message key
message = key;
}
if (arguments == null || arguments.length == 0) {
// When no arguments just return the message without formatting
return message;
}
MessageFormat messageFormat = getMessageFormat(locale, message);
synchronized (messageFormat) {
// Synchronized block on messageFormat as it is not threadsafe
return messageFormat.format(arguments, new StringBuffer(), null).toString();
}
}
protected MessageFormat getMessageFormat(Locale locale, String message) {
Map map = messageFormatMap.computeIfAbsent(locale, l -> {
return new ConcurrentHashMap<>();
});
return map.computeIfAbsent(message, m -> {
return new MessageFormat(m, locale);
});
}
/**
* Gets the message from cache or the resource bundles. Returns an empty string
* if not found.
*
* @param locale the locale
* @param key the message key
* @return the message
*/
protected String getMessageFromCache(Locale locale, String key) {
Map map = messageMap.computeIfAbsent(locale, l -> new ConcurrentHashMap<>());
return map.computeIfAbsent(key, k -> {
return resolveMessage(locale, k);
});
}
/**
* Gets the message from the resource bundles. Returns an empty string if not
* found.
*
* @param locale the locale
* @param key the message key
* @return the message
*/
protected String resolveMessage(Locale locale, String key) {
Optional optionalPattern = this.baseNames.stream().map(baseName -> getResourceBundle(baseName, locale))
.filter(Objects::nonNull).map(resourceBundle -> {
try {
return resourceBundle.getString(key);
} catch (MissingResourceException e) {
return null;
}
}).filter(Objects::nonNull).findFirst();
return optionalPattern.orElse("");
}
protected Map getResourceBundle(String baseName) {
return resourceBundleMap.computeIfAbsent(baseName, key -> {
return new ConcurrentHashMap<>();
});
}
protected ResourceBundle getResourceBundle(String baseName, Locale locale) {
return getResourceBundle(baseName).computeIfAbsent(locale, key -> {
try {
return ResourceBundle.getBundle(baseName, key);
} catch (MissingResourceException e) {
return null;
}
});
}
}