1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
7 ------------- Copyright (C) 2004 Jon S. Berndt (jsb@hal-pc.org) -------------
9 This program is free software; you can redistribute it and/or modify it under
10 the terms of the GNU Lesser General Public License as published by the Free Software
11 Foundation; either version 2 of the License, or (at your option) any later
14 This program is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
16 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
19 You should have received a copy of the GNU Lesser General Public License along with
20 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21 Place - Suite 330, Boston, MA 02111-1307, USA.
23 Further information about the GNU Lesser General Public License can also be found on
24 the world wide web at http://www.gnu.org.
26 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
28 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
33 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
38 # include <simgear/compiler.h>
39 # ifdef SG_HAVE_STD_INCLUDES
54 #include <math/FGColumnVector3.h>
56 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
58 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
60 #define ID_XMLELEMENT "$Id$"
62 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
64 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
68 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
70 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
72 /** Encapsulates an XML element.
73 This class handles the creation, storage, and manipulation of XML elements.
74 This class also can convert supplied values as follows:
76 convert ["from"]["to"] = factor, so: from * factor = to
77 - convert["M"]["FT"] = 3.2808399;
78 - convert["FT"]["M"] = 1.0/convert["M"]["FT"];
79 - convert["M2"]["FT2"] = convert["M"]["FT"]*convert["M"]["FT"];
80 - convert["FT2"]["M2"] = 1.0/convert["M2"]["FT2"];
81 - convert["FT"]["IN"] = 12.0;
82 - convert["IN"]["FT"] = 1.0/convert["FT"]["IN"];
83 - convert["LBS"]["KG"] = 0.45359237;
84 - convert["KG"]["LBS"] = 1.0/convert["LBS"]["KG"];
85 - convert["SLUG*FT2"]["KG*M2"] = 1.35594;
86 - convert["KG*M2"]["SLUG*FT2"] = 1.0/convert["SLUG*FT2"]["KG*M2"];
87 - convert["RAD"]["DEG"] = 360.0/(2.0*3.1415926);
88 - convert["DEG"]["RAD"] = 1.0/convert["RAD"]["DEG"];
89 - convert["LBS/FT"]["N/M"] = 14.5939;
90 - convert["LBS/FT/SEC"]["N/M/SEC"] = 14.5939;
91 - convert["N/M"]["LBS/FT"] = 1.0/convert["LBS/FT"]["N/M"];
92 - convert["N/M/SEC"]["LBS/FT/SEC"] = 1.0/convert["LBS/FT/SEC"]["N/M/SEC"];
93 - convert["WATTS"]["HP"] = 0.001341022;
94 - convert["HP"]["WATTS"] = 1.0/convert["WATTS"]["HP"];
95 - convert["N"]["LBS"] = 0.22482;
96 - convert["LBS"]["N"] = 1.0/convert["N"]["LBS"];
97 - convert["KTS"]["FT/SEC"] = ktstofps;
99 - convert["M"]["M"] = 1.00;
100 - convert["FT"]["FT"] = 1.00;
101 - convert["IN"]["IN"] = 1.00;
102 - convert["DEG"]["DEG"] = 1.00;
103 - convert["RAD"]["RAD"] = 1.00;
104 - convert["M2"]["M2"] = 1.00;
105 - convert["FT2"]["FT2"] = 1.00;
106 - convert["KG*M2"]["KG*M2"] = 1.00;
107 - convert["SLUG*FT2"]["SLUG*FT2"] = 1.00;
108 - convert["KG"]["KG"] = 1.00;
109 - convert["LBS"]["LBS"] = 1.00;
110 - convert["LBS/FT"]["LBS/FT"] = 1.00;
111 - convert["N/M"]["N/M"] = 1.00;
112 - convert["LBS/FT/SEC"]["LBS/FT/SEC"] = 1.00;
113 - convert["N/M/SEC"]["N/M/SEC"] = 1.00;
114 - convert["PSI"]["PSI"] = 1.00;
115 - convert["INHG"]["INHG"] = 1.00;
116 - convert["HP"]["HP"] = 1.00;
117 - convert["N"]["N"] = 1.00;
118 - convert["WATTS"]["WATTS"] = 1.00;
119 - convert["KTS"]["KTS"] = 1.0;
120 - convert["FT/SEC"]["FT/SEC"] = 1.0;
125 - M2 = meters squared
136 @author Jon S. Berndt
140 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
142 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
147 @param nm the name of this element (if given)
149 Element(std::string nm);
153 /** Retrieves an attribute.
154 @param key specifies the attribute key to retrieve the value of.
155 @return the key value (as a string), or the empty string if no such
157 std::string GetAttributeValue(std::string key);
159 /** Retrieves an attribute value as a double precision real number.
160 @param key specifies the attribute key to retrieve the value of.
161 @return the key value (as a number), or the HUGE_VAL if no such
163 double GetAttributeValueAsNumber(std::string key);
165 /** Retrieves the element name.
166 @return the element name, or the empty string if no name has been set.*/
167 std::string GetName(void) {return name;}
169 /** Gets a line of data belonging to an element.
170 @param i the index of the data line to return (0 by default).
171 @return a string representing the data line requested, or the empty string
173 std::string GetDataLine(unsigned int i=0);
175 /// Returns the number of lines of data stored
176 unsigned int GetNumDataLines(void) {return (unsigned int)data_lines.size();}
178 /// Returns the number of child elements for this element.
179 unsigned int GetNumElements(void) {return (unsigned int)children.size();}
181 /// Returns the number of named child elements for this element.
182 unsigned int GetNumElements(std::string);
184 /** Converts the element data to a number.
185 This function attempts to convert the first (and presumably only) line of
186 data "owned" by the element into a real number. If there is not exactly one
187 line of data owned by the element, then HUGE_VAL is returned.
188 @return the numeric value of the data owned by the element.*/
189 double GetDataAsNumber(void);
191 /** Returns a pointer to the element requested by index.
192 This function also resets an internal counter to the index, so that
193 subsequent calls to GetNextElement() will return the following
194 elements sequentially, until the last element is reached. At that point,
195 GetNextElement() will return NULL.
196 @param el the index of the requested element (0 by default)
197 @return a pointer to the Element, or 0 if no valid element exists. */
198 Element* GetElement(unsigned int el=0);
200 /** Returns a pointer to the next element in the list.
201 The function GetElement() must be called first to be sure that this
202 function will return the correct element. The call to GetElement() resets
203 the internal counter to zero. Subsequent calls to GetNextElement() return
204 a pointer to subsequent elements in the list. When the final element is
205 reached, 0 is returned.
206 @return a pointer to the next Element in the sequence, or 0 if no valid
207 Element is present. */
208 Element* GetNextElement(void);
210 /** Returns a pointer to the parent of an element.
211 @return a pointer to the parent Element, or 0 if this is the top level Element. */
212 Element* GetParent(void) {return parent;}
214 /** Searches for a specified element.
215 Finds the first element that matches the supplied std::string, or simply the first
216 element if no search std::string is supplied. This function call resets the internal
217 element counter to the first element.
218 @param el the search std::string (empty std::string by default).
219 @return a pointer to the first element that matches the supplied search std::string. */
220 Element* FindElement(std::string el="");
222 /** Searches for the next element as specified.
223 This function would be called after FindElement() is first called (in order to
224 reset the internal counter). If no argument is supplied (or the empty string)
225 a pointer to the very next element is returned. Otherwise, the next occurence
226 of the named element is returned. If the end of the list is reached, 0 is
228 @param el the name of the next element to find.
229 @return the pointer to the found element, or 0 if no appropriate element us
231 Element* FindNextElement(std::string el="");
233 /** Searches for the named element and returns the string data belonging to it.
234 This function allows the data belonging to a named element to be returned
235 as a string. If no element is found, the empty string is returned. If no
236 argument is supplied, the data string for the first element is returned.
237 @param el the name of the element being searched for (the empty string by
239 @return the data value for the named element as a string, or the empty
240 string if the element cannot be found. */
241 std::string FindElementValue(std::string el="");
243 /** Searches for the named element and returns the data belonging to it as a number.
244 This function allows the data belonging to a named element to be returned
245 as a double. If no element is found, HUGE_VAL is returned. If no
246 argument is supplied, the data for the first element is returned.
247 @param el the name of the element being searched for (the empty string by
249 @return the data value for the named element as a double, or HUGE_VAL if the
251 double FindElementValueAsNumber(std::string el="");
253 /** Searches for the named element and converts and returns the data belonging to it.
254 This function allows the data belonging to a named element to be returned
255 as a double. If no element is found, HUGE_VAL is returned. If no
256 argument is supplied, the data for the first element is returned. Additionally,
257 this function converts the value from the units specified in the config file (via
258 the UNITS="" attribute in the element definition) to the native units used by
259 JSBSim itself, as specified by the target_units parameter. The currently
260 allowable unit conversions are seen in the source file FGXMLElement.cpp.
261 Also, see above in the main documentation for this class.
262 @param el the name of the element being searched for (the empty string by
264 @param target_units the string representing the native units used by JSBSim
265 to which the value returned will be converted.
266 @return the unit-converted data value for the named element as a double,
267 or HUGE_VAL if the data is missing. */
268 double FindElementValueAsNumberConvertTo(std::string el, std::string target_units);
270 /** Searches for the named element and converts and returns the data belonging to it.
271 This function allows the data belonging to a named element to be returned
272 as a double. If no element is found, HUGE_VAL is returned. If no
273 argument is supplied, the data for the first element is returned. Additionally,
274 this function converts the value from the units specified in the supplied_units
275 parameter to the units specified in the target_units parameter. JSBSim itself,
276 as specified by the target_units parameter. The currently allowable unit
277 conversions are seen in the source file FGXMLElement.cpp. Also, see above
278 in the main documentation for this class.
279 @param el the name of the element being searched for (the empty string by
281 @param supplied_units the string representing the units of the value as
282 supplied by the config file.
283 @param target_units the string representing the native units used by JSBSim
284 to which the value returned will be converted.
285 @return the unit-converted data value for the named element as a double,
286 or HUGE_VAL if the data is missing. */
287 double FindElementValueAsNumberConvertFromTo( std::string el,
288 std::string supplied_units,
289 std::string target_units);
291 /** Composes a 3-element column vector for the supplied location or orientation.
292 This function processes a LOCATION or ORIENTATION construct, returning a
293 filled-out 3-element column vector containing the X, Y, Z or ROLL, PITCH,
294 YAW elements found in the supplied element. If one of the mentioned components
295 is not found, that component is set to zero and a warning message is printed.
296 All three elements should be supplied.
297 @param target_units the string representing the native units used by JSBSim
298 to which the value returned will be converted.
299 @return a column vector object built from the LOCATION or ORIENT components. */
300 FGColumnVector3 FindElementTripletConvertTo( std::string target_units);
302 /** This function sets the value of the parent class attribute to the supplied
304 @param p pointer to the parent Element. */
305 void SetParent(Element* p) {parent = p;}
307 /** Adds a child element to the list of children stored for this element.
308 * @param el Child element to add. */
309 void AddChildElement(Element* el) {children.push_back(el);}
311 /** Stores an attribute belonging to this element.
312 * @param name The string name of the attribute.
313 * @param value The string value of the attribute. */
314 void AddAttribute(std::string name, std::string value);
316 /** Stores data belonging to this element.
317 * @param d the data to store. */
318 void AddData(std::string d);
320 /** Prints the element.
321 * Prints this element and calls the Print routine for child elements.
322 * @param d The tab level. A level corresponds to a single space. */
323 void Print(unsigned int level=0);
327 std::map <std::string, std::string> attributes;
328 std::vector <std::string> data_lines;
329 std::vector <Element*> children;
330 std::vector <std::string> attribute_key;
332 unsigned int element_index;
333 typedef std::map <std::string, std::map <std::string, double> > tMapConvert;
337 } // namespace JSBSim
339 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%