Here you can find the source of getStringConfigValue( final String configKey, final Properties config)
public static Optional<String> getStringConfigValue( final String configKey, final Properties config)
//package com.java2s; /**/*from w ww. j av a 2s . c o m*/ * Copyright (C) 2015 ? 2016 Dortmund University Library, SLUB Dresden & Avantgarde Labs GmbH (<code@dswarm.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. */ import java.util.*; public class Main { public static Optional<String> getStringConfigValue( final String configKey, final Properties config) { final String configValue = config.getProperty(configKey); final Optional<String> optionalConfigValue; if (configValue != null && !configValue.trim().isEmpty()) { optionalConfigValue = Optional.of(configValue); } else { optionalConfigValue = Optional.empty(); } return optionalConfigValue; } }