001 // This file is part of the program FRYSK.
002 //
003 // Copyright 2008 Red Hat Inc.
004 //
005 // FRYSK is free software; you can redistribute it and/or modify it
006 // under the terms of the GNU General Public License as published by
007 // the Free Software Foundation; version 2 of the License.
008 //
009 // FRYSK is distributed in the hope that it will be useful, but
010 // WITHOUT ANY WARRANTY; without even the implied warranty of
011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 // General Public License for more details.
013 //
014 // You should have received a copy of the GNU General Public License
015 // along with FRYSK; if not, write to the Free Software Foundation,
016 // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
017 //
018 // In addition, as a special exception, Red Hat, Inc. gives You the
019 // additional right to link the code of FRYSK with code not covered
020 // under the GNU General Public License ("Non-GPL Code") and to
021 // distribute linked combinations including the two, subject to the
022 // limitations in this paragraph. Non-GPL Code permitted under this
023 // exception must only link to the code of FRYSK through those well
024 // defined interfaces identified in the file named EXCEPTION found in
025 // the source code files (the "Approved Interfaces"). The files of
026 // Non-GPL Code may instantiate templates or use macros or inline
027 // functions from the Approved Interfaces without causing the
028 // resulting work to be covered by the GNU General Public
029 // License. Only Red Hat, Inc. may make changes or additions to the
030 // list of Approved Interfaces. You must obey the GNU General Public
031 // License in all respects for all of the FRYSK code and other code
032 // used in conjunction with FRYSK except the Non-GPL Code covered by
033 // this exception. If you modify this file, you may extend this
034 // exception to your version of the file, but you are not obligated to
035 // do so. If you do not wish to provide this exception without
036 // modification, you must delete this exception statement from your
037 // version and license this file solely under the GPL without
038 // exception.
039
040 package frysk.proc;
041
042 import java.util.HashMap;
043 import java.util.Map.Entry;
044 import java.util.Iterator;
045 import java.util.Set;
046
047 /**
048 * The environment vector.
049 */
050 public class Environ {
051 private final HashMap environ;
052
053 /**
054 * Create a new empty environment.
055 */
056 public Environ() {
057 environ = new HashMap();
058 }
059 /**
060 * Create a new environment populated by the existing environ.
061 */
062 public Environ(String[] environ) {
063 this();
064 put(environ);
065 }
066
067 /**
068 * Return the environ as a string array.
069 */
070 public String[] toStringArray() {
071 Set entries = environ.entrySet();
072 String[] env = new String[environ.size()];
073 int j = 0;
074 for (Iterator i = entries.iterator(); i.hasNext(); ) {
075 Entry e = (Entry)i.next();
076 String name = (String)e.getKey();
077 String value = (String)e.getValue();
078 env[j++] = name + "=" + value;
079 }
080 return env;
081 }
082
083 /**
084 * Get an environment variable.
085 * @param name is the environment variable name.
086 * @return the value of the variable.
087 */
088 public String get(String name) {
089 return (String)environ.get(name);
090 }
091
092 /**
093 * Put the variable into the environ set with the provided value.
094 * @param name is the environment variable name.
095 * @param value is the environment variable value.
096 */
097 public void put(String name, String value) {
098 environ.put(name, value);
099 }
100
101 /**
102 * Decode then add an environment variable.
103 * @param name is the variable=value pair.
104 */
105 public void put(String name) {
106 String[] member = name.split("=");
107 if (member.length == 2) {
108 environ.put(member[0], member[1]);
109 } else {
110 environ.put(member[0], "");
111 }
112 }
113
114 /**
115 * Put all elements of the the ENVIRON array into the ENVIRON set.
116 */
117 public void put(String[] environ) {
118 for (int i = 0; i < environ.length; i++) {
119 put(environ[i]);
120 }
121 }
122
123 /**
124 * Delete the entry.
125 */
126 public void remove(String name) {
127 environ.remove(name);
128 }
129 }