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/*
* 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.logging.log4j.core.lookup;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.MarkerManager;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.plugins.Plugin;
import org.apache.logging.log4j.status.StatusLogger;
/**
* Looks up keys from resource bundles.
*/
@Plugin(name = "bundle", category = StrLookup.CATEGORY)
public class ResourceBundleLookup extends AbstractLookup {
private static final Logger LOGGER = StatusLogger.getLogger();
private static final Marker LOOKUP = MarkerManager.getMarker("LOOKUP");
/**
* Looks up the value for the key in the format "BundleName:BundleKey".
*
* For example: "com.domain.messages:MyKey".
*
* @param event
* The current LogEvent.
* @param key
* the key to be looked up, may be null
* @return The value associated with the key.
*/
@Override
public String lookup(final LogEvent event, final String key) {
if (key == null) {
return null;
}
final String[] keys = key.split(":");
final int keyLen = keys.length;
if (keyLen != 2) {
LOGGER.warn(LOOKUP, "Bad ResourceBundle key format [{}]. Expected format is BundleName:KeyName.", key);
return null;
}
final String bundleName = keys[0];
final String bundleKey = keys[1];
try {
// The ResourceBundle class caches bundles, no need to cache here.
return ResourceBundle.getBundle(bundleName).getString(bundleKey);
} catch (final MissingResourceException e) {
LOGGER.warn(LOOKUP, "Error looking up ResourceBundle [{}].", bundleName, e);
return null;
}
}
}