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source: code/branches/core4/src/util/OutputBuffer.h @ 3665

Last change on this file since 3665 was 3196, checked in by rgrieder, 15 years ago

Merged pch branch back to trunk.

  • Property svn:eol-style set to native
File size: 5.6 KB
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1/*
2 *   ORXONOX - the hottest 3D action shooter ever to exist
3 *                    > www.orxonox.net <
4 *
5 *
6 *   License notice:
7 *
8 *   This program is free software; you can redistribute it and/or
9 *   modify it under the terms of the GNU General Public License
10 *   as published by the Free Software Foundation; either version 2
11 *   of the License, or (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
21 *
22 *   Author:
23 *      Fabian 'x3n' Landau
24 *   Co-authors:
25 *      ...
26 *
27 */
28
29/**
30    @file
31    @brief Declaration of the OutputBuffer class.
32
33    The OutputBuffer acts almost like std::ostream. You can put text and other values to the
34    OutputBuffer by using the << operator. The OutputBuffer stores the text and calls registerd
35    listeners if new text gets assigned.
36    The listeners are then able to retrieve the text line by line.
37
38    It's important to know that getLine actually removes the line from the OutputBuffer, so it's
39    better to only have one "active" listener.
40*/
41
42#ifndef _OutputBuffer_H__
43#define _OutputBuffer_H__
44
45#include "UtilPrereqs.h"
46
47#include <vector>
48#include <sstream>
49
50namespace orxonox
51{
52    /**
53        @brief A pure virtual baseclass for classes that want to register as listener to an OutputBuffer.
54
55        This class is pure virtual, so an inheriting class has to implement the function on it's own.
56        The function get's called, if an instance of the inheriting class registers as a listener at
57        an OutputBuffer and this buffer changes.
58    */
59    class OutputBufferListener
60    {
61        friend class OutputBuffer;
62
63        public:
64            virtual ~OutputBufferListener() {}
65
66        private:
67            virtual void outputChanged() = 0;
68    };
69
70    /**
71        @brief The OutputBuffer acts almost like std::ostream and stores the assigned text.
72
73        If text gets assigned by using the << operator or another function, the OutputBuffer
74        calls it's listeners, allowing them to retrieve the text line by line.
75
76        It's important to know that getLine actually removes the line from the OutputBuffer, so it's
77        better to only have one "active" listener.
78    */
79    class _UtilExport OutputBuffer
80    {
81        public:
82            OutputBuffer() {}
83            ~OutputBuffer() {}
84
85            /**
86                @brief Puts some object/value to the OutputBuffer. The text gets assigned and the OutputBuffer calls it's listeners.
87                @param object The object/value to assign
88            */
89            template <class T>
90            inline OutputBuffer& operator<<(T object)
91            {
92                this->stream_ << object;
93                this->callListeners();
94                return *this;
95            }
96
97            /**
98                @brief Reads the stored text of the other OutputBuffer and calls the listeners.
99                @param object The other OutputBuffer
100            */
101            template <const OutputBuffer&>
102            inline OutputBuffer& operator<<(const OutputBuffer& object)
103            {
104                this->stream_ << object.stream_.rdbuf();
105                this->callListeners();
106                return *this;
107            }
108
109            OutputBuffer& operator<<(std::ostream& (*manipulator)(std::ostream&));
110            OutputBuffer& operator<<(std::ios& (*manipulator)(std::ios&));
111            OutputBuffer& operator<<(std::ios_base& (*manipulator)(std::ios_base&));
112
113            /**
114                @brief Does the same like operator<<: Assigns the object to the stream and calls the listeners.
115                @param object The object/value
116            */
117            template <class T>
118            inline void add(T object)
119            {
120                this->stream_ << object;
121                this->callListeners();
122            }
123
124            /**
125                @brief Assigns an object/value and adds std::endl.
126                @param object The object/value
127            */
128            template <class T>
129            inline void addLine(T object)
130            {
131                this->stream_ << object << std::endl;
132                this->callListeners();
133            }
134
135            /**
136                @brief Puts std::endl to the stream and calls the listeners.
137            */
138            inline void newline()
139            {
140                this->stream_ << std::endl;
141                this->callListeners();
142            }
143
144            /**
145                @brief Flushes the stored text (~empties the OutputBuffer).
146            */
147            inline void flush()
148            {
149                this->stream_.flush();
150            }
151
152            bool getLine(std::string* output);
153
154            void registerListener(OutputBufferListener* listener);
155            void unregisterListener(OutputBufferListener* listener);
156
157            /**
158                @brief Returns the internal stringstream object.
159            */
160            inline std::stringstream& getStream()
161            {
162                return this->stream_;
163            }
164
165        private:
166            void callListeners();
167
168            std::stringstream stream_;                     //!< The stringstream that stores the assigned text
169            std::vector<OutputBufferListener*> listeners_; //!< A list of all listeners
170    };
171}
172
173#endif /* _OutputBuffer_H__ */
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