Java tutorial
/* * Copyright 2015, 2016 Ether.Camp Inc. (US) * This file is part of Ethereum Harmony. * * Ethereum Harmony is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Ethereum Harmony is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Ethereum Harmony. If not, see <http://www.gnu.org/licenses/>. */ package com.ethercamp.harmony.service; import lombok.Value; import org.springframework.core.env.Environment; import org.springframework.data.util.Pair; import java.util.HashMap; import java.util.Map; import java.util.Optional; /** * Created by Stan Reshetnyk on 20.01.17. */ class BlockchainConsts { /** * Return pair of name and explorer url. */ public static Pair<String, Optional<String>> getNetworkInfo(Environment env, String genesisHash) { final String networkNameKey = String.format("network.%s.networkName", genesisHash); final String explorerUrlKey = String.format("network.%s.explorerUrl", genesisHash); return Optional.ofNullable(env.getProperty(networkNameKey)) .map(name -> Pair.of(name, Optional.ofNullable(env.getProperty(explorerUrlKey)))) .orElse(Pair.of("Unknown network", Optional.empty())); } }