001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018 package org.apache.commons.exec.environment; 019 020 import java.io.BufferedReader; 021 import java.io.IOException; 022 import java.util.HashMap; 023 import java.util.Map; 024 025 import org.apache.commons.exec.CommandLine; 026 027 /** 028 * Helper class to determine the environment variable 029 * for VMS. 030 */ 031 public class OpenVmsProcessingEnvironment extends DefaultProcessingEnvironment { 032 033 /** 034 * Find the list of environment variables for this process. 035 * 036 * @return a map containing the environment variables 037 * @throws IOException the operation failed 038 */ 039 protected Map createProcEnvironment() throws IOException { 040 if (procEnvironment == null) { 041 BufferedReader in = runProcEnvCommand(); 042 procEnvironment = addVMSenvironmentVariables(new HashMap(), in); 043 } 044 045 return procEnvironment; 046 } 047 048 /** 049 * Determine the OS specific command line to get a list of environment 050 * variables. 051 * 052 * @return the command line 053 */ 054 protected CommandLine getProcEnvCommand() { 055 CommandLine commandLine = new CommandLine("show"); 056 commandLine.addArgument("symbol/global"); // the parser assumes symbols are global 057 commandLine.addArgument("*"); 058 return commandLine; 059 } 060 061 /** 062 * This method is VMS specific and used by getProcEnvironment(). Parses VMS 063 * symbols from <code>in</code> and adds them to <code>environment</code>. 064 * <code>in</code> is expected to be the output of "SHOW SYMBOL/GLOBAL *". 065 * 066 * @param environment the current environment 067 * @param in the reader from the process to determine VMS env variables 068 * @return the updated environment 069 * @throws IOException operation failed 070 */ 071 private Map addVMSenvironmentVariables(final Map environment, 072 final BufferedReader in) throws IOException { 073 String line; 074 while ((line = in.readLine()) != null) { 075 final String SEP = "=="; // global symbol separator 076 int sepidx = line.indexOf(SEP); 077 if (sepidx > 0){ 078 String name = line.substring(0, sepidx).trim(); 079 String value = line.substring(sepidx+SEP.length()).trim(); 080 value = value.substring(1,value.length()-1); // drop enclosing quotes 081 environment.put(name,value); 082 } 083 } 084 return environment; 085 } 086 }