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SystemEnvironment.h
1 /* -*- mode: c++; indent-tabs-mode: nil -*- */
2 /*
3 SystemEnvironment.h
4
5 Qore Programming Language
6
7 Copyright 2003 - 2013 David Nichols
8
9 This library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
13
14 This library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public
20 License along with this library; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #ifndef _QORE_SYSTEMENVIRONMENT_H
25
26 #define _QORE_SYSTEMENVIRONMENT_H
27
29
38 class SystemEnvironment {
39 friend class AtomicEnvironmentSetter;
40
41 private:
43 DLLLOCAL SystemEnvironment(const SystemEnvironment&);
44
46 DLLLOCAL SystemEnvironment& operator=(const SystemEnvironment&);
47
48 protected:
50
55 DLLLOCAL static int set_intern(const char *name, const char *value, bool overwrite = 1);
56
58
62 DLLLOCAL static class QoreString *get_intern(const char *name);
63
65
69 DLLLOCAL static class QoreStringNode *get_as_string_node_intern(const char *name);
70
72
77 DLLLOCAL static int get_intern(const char *name, class QoreString &str);
78
80
84 DLLLOCAL static int unset_intern(const char *name);
85
86 public:
87 DLLLOCAL SystemEnvironment();
88 DLLLOCAL ~SystemEnvironment();
89
91
96 DLLEXPORT static int set(const char *name, const char *value, bool overwrite = 1);
97
99
103 DLLEXPORT static class QoreString *get(const char *name);
104
106
110 DLLEXPORT static class QoreStringNode *getAsStringNode(const char *name);
111
113
118 DLLEXPORT static int get(const char *name, class QoreString &str);
119
121
125 DLLEXPORT static int unset(const char *name);
126
128
132 DLLEXPORT static bool valueExists(const char* name); // true if exists and is not empty
133 };
134
135 DLLEXPORT extern SystemEnvironment SysEnv;
136
138
142 class AtomicEnvironmentSetter
143 {
144 private:
146 DLLLOCAL AtomicEnvironmentSetter(const AtomicEnvironmentSetter&);
147
149 DLLLOCAL AtomicEnvironmentSetter& operator=(const AtomicEnvironmentSetter&);
150
152 DLLLOCAL void* operator new(size_t); // not implemented, make sure it is not new'ed
153
154 public:
155 DLLEXPORT AtomicEnvironmentSetter();
156 DLLEXPORT ~AtomicEnvironmentSetter();
157
159
164 DLLEXPORT int set(const char *name, const char *value, bool overwrite = 1);
165
167
171 DLLEXPORT class QoreString *get(const char *name);
172
174
178 DLLEXPORT class QoreStringNode *getAsStringNode(const char *name);
179
181
186 DLLEXPORT int get(const char *name, class QoreString &str);
187
189
193 DLLEXPORT int unset(const char *name);
194
196
200 DLLEXPORT bool valueExists(const char* name); // true if exists and is not empty
201 };
202
203 #endif
AtomicEnvironmentSetter
class allowing for multiple updates to the system environment within a single lock in a thread-safe w...
Definition: SystemEnvironment.h:142
SystemEnvironment::valueExists
static DLLEXPORT bool valueExists(const char *name)
returns true if the environment variable exists and has a value, false if not
SystemEnvironment::set_intern
static DLLLOCAL int set_intern(const char *name, const char *value, bool overwrite=1)
sets the given environment variable to the value passed, respecting the overwrite flag ...
SystemEnvironment::get_as_string_node_intern
static DLLLOCAL class QoreStringNode * get_as_string_node_intern(const char *name)
returns the value of the environment variable as a new QoreStringNode object, 0 if not present...
AtomicEnvironmentSetter::unset
DLLEXPORT int unset(const char *name)
unsets the given environment variable
SystemEnvironment
class used to safely manipulate the system environment
Definition: SystemEnvironment.h:38
AtomicEnvironmentSetter::set
DLLEXPORT int set(const char *name, const char *value, bool overwrite=1)
sets the given environment variable to the value passed, respecting the overwrite flag ...
QoreString
Qore&#39;s string type supported by the QoreEncoding class.
Definition: QoreString.h:42
QoreStringNode
Qore&#39;s string value type, reference counted, dynamically-allocated only.
Definition: QoreStringNode.h:40
SystemEnvironment::unset_intern
static DLLLOCAL int unset_intern(const char *name)
unsets the given environment variable
SystemEnvironment::getAsStringNode
static DLLEXPORT class QoreStringNode * getAsStringNode(const char *name)
returns the value of the environment variable as a new QoreStringNode object, 0 if not present...
SystemEnvironment::unset
static DLLEXPORT int unset(const char *name)
unsets the given environment variable
SystemEnvironment::get_intern
static DLLLOCAL class QoreString * get_intern(const char *name)
returns the value of the environment variable as a new QoreString object, 0 if not present...
AtomicEnvironmentSetter::getAsStringNode
DLLEXPORT class QoreStringNode * getAsStringNode(const char *name)
returns the value of the environment variable as a new QoreStringNode object, 0 if not present...
SystemEnvironment::set
static DLLEXPORT int set(const char *name, const char *value, bool overwrite=1)
sets the given environment variable to the value passed, respecting the overwrite flag ...
AtomicEnvironmentSetter::valueExists
DLLEXPORT bool valueExists(const char *name)
returns true if the environment variable exists and has a value, false if not