package io.blobkeeper.common.configuration;
/*
* Copyright (C) 2015 by Denis M. Gabaydulin
*
* 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.
*/
import com.google.common.base.Strings;
import org.jetbrains.annotations.NotNull;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;
import static com.google.common.base.Strings.isNullOrEmpty;
import static java.lang.String.format;
public class PropertiesLoader {
private static final Logger log = LoggerFactory.getLogger(PropertiesLoader.class);
@NotNull
public static Properties loadProperties(String propertyFileName, Class<?> clazz) throws Exception {
String fileName = System.getProperty(propertyFileName);
Properties properties = new Properties();
try {
InputStream inputStream;
if (!isNullOrEmpty(fileName)) {
log.debug("Loading {} for {} from file: {}", propertyFileName, clazz.getSimpleName(), fileName);
inputStream = new FileInputStream(fileName);
} else {
log.debug("Loading {} for {} from resource: {}", propertyFileName, clazz.getSimpleName(), fileName);
ClassLoader loader = clazz.getClassLoader();
URL url = loader.getResource(propertyFileName);
assert null != url;
inputStream = url.openStream();
}
properties.load(inputStream);
return properties;
} catch (IOException e) {
throw new IllegalArgumentException(format("Failed to load config: %s", propertyFileName), e);
}
}
}