Java tutorial
/* * Copyright 2009-2017 Aconex * * 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 io.pcp.parfait.dxm; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.util.Properties; import com.google.common.io.Closeables; public class PcpConfig { private final static String pcpConf = System.getenv("PCP_CONF"); private final static String pcpDir = System.getenv("PCP_DIR"); public File getRoot() { return new File(pcpDir, "/"); } private File getConfigFile() { if (pcpConf == null) { File etcDir = new File(getRoot(), "etc"); return new File(etcDir, "pcp.conf"); } return new File(pcpConf); } public String getValue(String key) { Properties properties = new Properties(); File configuration = getConfigFile(); InputStream is = null; String value = System.getenv(key); if (value != null) { return value; } try { is = new FileInputStream(configuration); properties.load(is); value = properties.get(key).toString(); } catch (FileNotFoundException e) { } catch (IOException e) { // just drop these, and go with defaults } finally { Closeables.closeQuietly(is); } return value; } }