Java tutorial
/* * Copyright 2002-2006,2009 The Apache Software Foundation. * * 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 com.opensymphony.xwork2.config.providers; import org.apache.commons.lang3.text.StrSubstitutor; import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; public class EnvsValueSubstitutor implements ValueSubstitutor { private static final Logger LOG = LogManager.getLogger(EnvsValueSubstitutor.class); protected StrSubstitutor strSubstitutor; public EnvsValueSubstitutor() { strSubstitutor = new StrSubstitutor(System.getenv()); strSubstitutor.setVariablePrefix("${env."); strSubstitutor.setVariableSuffix('}'); strSubstitutor.setValueDelimiter(":"); } @Override public String substitute(String value) { LOG.debug("Substituting value {} with proper System variable or environment variable", value); String substituted = StrSubstitutor.replaceSystemProperties(value); return strSubstitutor.replace(substituted); } }