src/FDM/JSBSim/input_output/FGXMLElement.cpp

   1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   2
   3  Author:       Jon Berndt
   4  Date started: 09/28/2004
   5  Purpose:      XML element class
   6  Called by:    FGXMLParse
   7
   8  ------------- Copyright (C) 2001  Jon S. Berndt (jon@jsbsim.org) -------------
   9
  10  This program is free software; you can redistribute it and/or modify it under
  11  the terms of the GNU Lesser General Public License as published by the Free Software
  12  Foundation; either version 2 of the License, or (at your option) any later
  13  version.
  14
  15  This program is distributed in the hope that it will be useful, but WITHOUT
  16  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
  18  details.
  19
  20  You should have received a copy of the GNU Lesser General Public License along with
  21  this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  22  Place - Suite 330, Boston, MA  02111-1307, USA.
  23
  24  Further information about the GNU Lesser General Public License can also be found on
  25  the world wide web at http://www.gnu.org.
  26
  27 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  28 INCLUDES
  29 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
  30
  31 #include "FGXMLElement.h"
  32
  33 #include <cmath>
  34 #include <cstdlib>
  35 #include <iostream>
  36
  37 using namespace std;
  38
  39 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  40 FORWARD DECLARATIONS
  41 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
  42
  43 namespace JSBSim {
  44
  45 static const char *IdSrc = "$Id: FGXMLElement.cpp,v 1.29 2010/03/18 13:18:31 jberndt Exp $";
  46 static const char *IdHdr = ID_XMLELEMENT;
  47
  48 bool Element::converterIsInitialized = false;
  49 map <string, map <string, double> > Element::convert;
  50
  51 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  52 CLASS IMPLEMENTATION
  53 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
  54
  55 Element::Element(const string& nm)
  56 {
  57   name   = nm;
  58   parent = 0L;
  59   element_index = 0;
  60
  61   if (!converterIsInitialized) {
  62     converterIsInitialized = true;
  63     // convert ["from"]["to"] = factor, so: from * factor = to
  64     // Length
  65     convert["M"]["FT"] = 3.2808399;
  66     convert["FT"]["M"] = 1.0/convert["M"]["FT"];
  67     convert["FT"]["IN"] = 12.0;
  68     convert["IN"]["FT"] = 1.0/convert["FT"]["IN"];
  69     convert["IN"]["M"] = convert["IN"]["FT"] * convert["FT"]["M"];
  70     convert["M"]["IN"] = convert["M"]["FT"] * convert["FT"]["IN"];
  71     // Area
  72     convert["M2"]["FT2"] = convert["M"]["FT"]*convert["M"]["FT"];
  73     convert["FT2"]["M2"] = 1.0/convert["M2"]["FT2"];
  74     convert["M2"]["IN2"] = convert["M"]["IN"]*convert["M"]["IN"];
  75     convert["IN2"]["M2"] = 1.0/convert["M2"]["IN2"];
  76     convert["FT2"]["IN2"] = 144.0;
  77     convert["IN2"]["FT2"] = 1.0/convert["FT2"]["IN2"];
  78     // Volume
  79     convert["IN3"]["CC"] = 16.387064;
  80     convert["CC"]["IN3"] = 1.0/convert["IN3"]["CC"];
  81     convert["FT3"]["IN3"] = 1728.0;
  82     convert["IN3"]["FT3"] = 1.0/convert["FT3"]["IN3"];
  83     convert["M3"]["FT3"] = 35.3146667;
  84     convert["FT3"]["M3"] = 1.0/convert["M3"]["FT3"];
  85     convert["LTR"]["IN3"] = 61.0237441;
  86     convert["IN3"]["LTR"] = 1.0/convert["LTR"]["IN3"];
  87     // Mass & Weight
  88     convert["LBS"]["KG"] = 0.45359237;
  89     convert["KG"]["LBS"] = 1.0/convert["LBS"]["KG"];
  90     convert["SLUG"]["KG"] = 14.59390;
  91     convert["KG"]["SLUG"] = 1.0/convert["SLUG"]["KG"];
  92     // Moments of Inertia
  93     convert["SLUG*FT2"]["KG*M2"] = 1.35594;
  94     convert["KG*M2"]["SLUG*FT2"] = 1.0/convert["SLUG*FT2"]["KG*M2"];
  95     // Angles
  96     convert["RAD"]["DEG"] = 360.0/(2.0*3.1415926);
  97     convert["DEG"]["RAD"] = 1.0/convert["RAD"]["DEG"];
  98     // Spring force
  99     convert["LBS/FT"]["N/M"] = 14.5939;
 100     convert["N/M"]["LBS/FT"] = 1.0/convert["LBS/FT"]["N/M"];
 101     // Damping force
 102     convert["LBS/FT/SEC"]["N/M/SEC"] = 14.5939;
 103     convert["N/M/SEC"]["LBS/FT/SEC"] = 1.0/convert["LBS/FT/SEC"]["N/M/SEC"];
 104     // Damping force (Square Law)
 105     convert["LBS/FT2/SEC2"]["N/M2/SEC2"] = 47.880259;
 106     convert["N/M2/SEC2"]["LBS/FT2/SEC2"] = 1.0/convert["LBS/FT2/SEC2"]["N/M2/SEC2"];
 107     // Power
 108     convert["WATTS"]["HP"] = 0.001341022;
 109     convert["HP"]["WATTS"] = 1.0/convert["WATTS"]["HP"];
 110     // Force
 111     convert["N"]["LBS"] = 0.22482;
 112     convert["LBS"]["N"] = 1.0/convert["N"]["LBS"];
 113     // Velocity
 114     convert["KTS"]["FT/SEC"] = 1.68781;
 115     convert["FT/SEC"]["KTS"] = 1.0/convert["KTS"]["FT/SEC"];
 116     convert["M/S"]["FT/S"] = 3.2808399;
 117     convert["M/SEC"]["FT/SEC"] = 3.2808399;
 118     convert["FT/S"]["M/S"] = 1.0/convert["M/S"]["FT/S"];
 119     convert["M/SEC"]["FT/SEC"] = 3.2808399;
 120     convert["FT/SEC"]["M/SEC"] = 1.0/convert["M/SEC"]["FT/SEC"];
 121     // Torque
 122     convert["FT*LBS"]["N*M"] = 1.35581795;
 123     convert["N*M"]["FT*LBS"] = 1/convert["FT*LBS"]["N*M"];
 124     // Valve
 125     convert["M4*SEC/KG"]["FT4*SEC/SLUG"] = convert["M"]["FT"]*convert["M"]["FT"]*
 126       convert["M"]["FT"]*convert["M"]["FT"]/convert["KG"]["SLUG"];
 127     convert["FT4*SEC/SLUG"]["M4*SEC/KG"] =
 128       1.0/convert["M4*SEC/KG"]["FT4*SEC/SLUG"];
 129     // Pressure
 130     convert["INHG"]["PSF"] = 70.7180803;
 131     convert["PSF"]["INHG"] = 1.0/convert["INHG"]["PSF"];
 132     convert["ATM"]["INHG"] = 29.9246899;
 133     convert["INHG"]["ATM"] = 1.0/convert["ATM"]["INHG"];
 134     convert["PSI"]["INHG"] = 2.03625437;
 135     convert["INHG"]["PSI"] = 1.0/convert["PSI"]["INHG"];
 136     convert["INHG"]["PA"] = 3386.0; // inches Mercury to pascals
 137     convert["PA"]["INHG"] = 1.0/convert["INHG"]["PA"];
 138     convert["LBS/FT2"]["N/M2"] = 14.5939/convert["FT"]["M"];
 139     convert["N/M2"]["LBS/FT2"] = 1.0/convert["LBS/FT2"]["N/M2"];
 140     convert["LBS/FT2"]["PA"] = convert["LBS/FT2"]["N/M2"];
 141     convert["PA"]["LBS/FT2"] = 1.0/convert["LBS/FT2"]["PA"];
 142     // Mass flow
 143     convert["KG/MIN"]["LBS/MIN"] = convert["KG"]["LBS"];
 144     // Fuel Consumption
 145     convert["LBS/HP*HR"]["KG/KW*HR"] = 0.6083;
 146     convert["KG/KW*HR"]["LBS/HP*HR"] = 1.0/convert["LBS/HP*HR"]["KG/KW*HR"];
 147     // Density
 148     convert["KG/L"]["LBS/GAL"] = 8.3454045;
 149     convert["LBS/GAL"]["KG/L"] = 1.0/convert["KG/L"]["LBS/GAL"];
 150
 151     // Length
 152     convert["M"]["M"] = 1.00;
 153     convert["FT"]["FT"] = 1.00;
 154     convert["IN"]["IN"] = 1.00;
 155     // Area
 156     convert["M2"]["M2"] = 1.00;
 157     convert["FT2"]["FT2"] = 1.00;
 158     // Volume
 159     convert["IN3"]["IN3"] = 1.00;
 160     convert["CC"]["CC"] = 1.0;
 161     convert["M3"]["M3"] = 1.0;
 162     convert["FT3"]["FT3"] = 1.0;
 163     convert["LTR"]["LTR"] = 1.0;
 164     // Mass & Weight
 165     convert["KG"]["KG"] = 1.00;
 166     convert["LBS"]["LBS"] = 1.00;
 167     // Moments of Inertia
 168     convert["KG*M2"]["KG*M2"] = 1.00;
 169     convert["SLUG*FT2"]["SLUG*FT2"] = 1.00;
 170     // Angles
 171     convert["DEG"]["DEG"] = 1.00;
 172     convert["RAD"]["RAD"] = 1.00;
 173     // Spring force
 174     convert["LBS/FT"]["LBS/FT"] = 1.00;
 175     convert["N/M"]["N/M"] = 1.00;
 176     // Damping force
 177     convert["LBS/FT/SEC"]["LBS/FT/SEC"] = 1.00;
 178     convert["N/M/SEC"]["N/M/SEC"] = 1.00;
 179     // Damping force (Square law)
 180     convert["LBS/FT2/SEC2"]["LBS/FT2/SEC2"] = 1.00;
 181     convert["N/M2/SEC2"]["N/M2/SEC2"] = 1.00;
 182     // Power
 183     convert["HP"]["HP"] = 1.00;
 184     convert["WATTS"]["WATTS"] = 1.00;
 185     // Force
 186     convert["N"]["N"] = 1.00;
 187     // Velocity
 188     convert["FT/SEC"]["FT/SEC"] = 1.00;
 189     convert["KTS"]["KTS"] = 1.00;
 190     convert["M/S"]["M/S"] = 1.0;
 191     convert["M/SEC"]["M/SEC"] = 1.0;
 192     // Torque
 193     convert["FT*LBS"]["FT*LBS"] = 1.00;
 194     convert["N*M"]["N*M"] = 1.00;
 195     // Valve
 196     convert["M4*SEC/KG"]["M4*SEC/KG"] = 1.0;
 197     convert["FT4*SEC/SLUG"]["FT4*SEC/SLUG"] = 1.0;
 198     // Pressure
 199     convert["PSI"]["PSI"] = 1.00;
 200     convert["PSF"]["PSF"] = 1.00;
 201     convert["INHG"]["INHG"] = 1.00;
 202     convert["ATM"]["ATM"] = 1.0;
 203     convert["PA"]["PA"] = 1.0;
 204     convert["N/M2"]["N/M2"] = 1.00;
 205     convert["LBS/FT2"]["LBS/FT2"] = 1.00;
 206     // Mass flow
 207     convert["LBS/SEC"]["LBS/SEC"] = 1.00;
 208     convert["KG/MIN"]["KG/MIN"] = 1.0;
 209     convert["LBS/MIN"]["LBS/MIN"] = 1.0;
 210     // Fuel Consumption
 211     convert["LBS/HP*HR"]["LBS/HP*HR"] = 1.0;
 212     convert["KG/KW*HR"]["KG/KW*HR"] = 1.0;
 213     // Density
 214     convert["KG/L"]["KG/L"] = 1.0;
 215     convert["LBS/GAL"]["LBS/GAL"] = 1.0;
 216   }
 217 }
 218
 219 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 220
 221 Element::~Element(void)
 222 {
 223   for (unsigned int i=0; i<children.size(); i++) delete children[i];
 224   data_lines.clear();
 225   attributes.clear();
 226   attribute_key.clear();
 227 }
 228
 229 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 230
 231 string Element::GetAttributeValue(const string& attr)
 232 {
 233   int select=-1;
 234   for (unsigned int i=0; i<attribute_key.size(); i++) {
 235     if (attribute_key[i] == attr) select = i;
 236   }
 237   if (select < 0) return string("");
 238   else return attributes[attr];
 239 }
 240
 241 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 242
 243 double Element::GetAttributeValueAsNumber(const string& attr)
 244 {
 245   string attribute = GetAttributeValue(attr);
 246
 247   if (attribute.empty()) return HUGE_VAL;
 248   else return (atof(attribute.c_str()));
 249 }
 250
 251 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 252
 253 Element* Element::GetElement(unsigned int el)
 254 {
 255   if (children.size() > el) {
 256     element_index = el;
 257     return children[el];
 258   }
 259   else {
 260     element_index = 0;
 261     return 0L;
 262   }
 263 }
 264
 265 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 266
 267 Element* Element::GetNextElement(void)
 268 {
 269   if (children.size() > element_index+1) {
 270     element_index++;
 271     return children[element_index];
 272   } else {
 273     element_index = 0;
 274     return 0L;
 275   }
 276 }
 277
 278 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 279
 280 string Element::GetDataLine(unsigned int i)
 281 {
 282   if (data_lines.size() > 0) return data_lines[i];
 283   else return string("");
 284 }
 285
 286 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 287
 288 double Element::GetDataAsNumber(void)
 289 {
 290   if (data_lines.size() == 1) {
 291     return atof(data_lines[0].c_str());
 292   } else if (data_lines.size() == 0) {
 293     return HUGE_VAL;
 294   } else {
 295     cerr << "Attempting to get single data value from multiple lines in element " << name << endl;
 296     return HUGE_VAL;
 297   }
 298 }
 299
 300 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 301
 302 unsigned int Element::GetNumElements(const string& element_name)
 303 {
 304   unsigned int number_of_elements=0;
 305   Element* el=FindElement(element_name);
 306   while (el) {
 307     number_of_elements++;
 308     el=FindNextElement(element_name);
 309   }
 310   return number_of_elements;
 311 }
 312
 313 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 314
 315 Element* Element::FindElement(const string& el)
 316 {
 317   if (el.empty() && children.size() >= 1) {
 318     element_index = 1;
 319     return children[0];
 320   }
 321   for (unsigned int i=0; i<children.size(); i++) {
 322     if (el == children[i]->GetName()) {
 323       element_index = i+1;
 324       return children[i];
 325     }
 326   }
 327   element_index = 0;
 328   return 0L;
 329 }
 330
 331 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 332
 333 Element* Element::FindNextElement(const string& el)
 334 {
 335   if (el.empty()) {
 336     if (element_index < children.size()) {
 337       return children[element_index++];
 338     } else {
 339       element_index = 0;
 340       return 0L;
 341     }
 342   }
 343   for (unsigned int i=element_index; i<children.size(); i++) {
 344     if (el == children[i]->GetName()) {
 345       element_index = i+1;
 346       return children[i];
 347     }
 348   }
 349   element_index = 0;
 350   return 0L;
 351 }
 352
 353 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 354
 355 double Element::FindElementValueAsNumber(const string& el)
 356 {
 357   Element* element = FindElement(el);
 358   if (element) {
 359     return element->GetDataAsNumber();
 360   } else {
 361     cerr << "Attempting to get single data value from multiple lines" << endl;
 362     return 0;
 363   }
 364 }
 365
 366 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 367
 368 string Element::FindElementValue(const string& el)
 369 {
 370   Element* element = FindElement(el);
 371   if (element) {
 372     return element->GetDataLine();
 373   } else {
 374     return "";
 375   }
 376 }
 377
 378 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 379
 380 double Element::FindElementValueAsNumberConvertTo(const string& el, const string& target_units)
 381 {
 382   Element* element = FindElement(el);
 383
 384   if (!element) {
 385     cerr << "Attempting to get non-existent element " << el << endl;
 386     exit(0);
 387   }
 388
 389   string supplied_units = element->GetAttributeValue("unit");
 390
 391   if (!supplied_units.empty()) {
 392     if (convert.find(supplied_units) == convert.end()) {
 393       cerr << endl << "Supplied unit: \"" << supplied_units << "\" does not exist (typo?). Add new unit"
 394            << " conversion in FGXMLElement.cpp." << endl;
 395       exit(-1);
 396     }
 397     if (convert[supplied_units].find(target_units) == convert[supplied_units].end()) {
 398       cerr << endl << "Supplied unit: \"" << supplied_units << "\" cannot be converted to "
 399                    << target_units << ". Add new unit conversion in FGXMLElement.cpp or fix typo" << endl;
 400       exit(-1);
 401     }
 402   }
 403
 404   double value = element->GetDataAsNumber();
 405   if (!supplied_units.empty()) {
 406     value *= convert[supplied_units][target_units];
 407   }
 408
 409   return value;
 410 }
 411
 412 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 413
 414 double Element::FindElementValueAsNumberConvertFromTo( const string& el,
 415                                                        const string& supplied_units,
 416                                                        const string& target_units)
 417 {
 418   Element* element = FindElement(el);
 419
 420   if (!element) {
 421     cerr << "Attempting to get non-existent element " << el << endl;
 422     exit(0);
 423   }
 424
 425   if (!supplied_units.empty()) {
 426     if (convert.find(supplied_units) == convert.end()) {
 427       cerr << endl << "Supplied unit: \"" << supplied_units << "\" does not exist (typo?). Add new unit"
 428            << " conversion in FGXMLElement.cpp." << endl;
 429       exit(-1);
 430     }
 431     if (convert[supplied_units].find(target_units) == convert[supplied_units].end()) {
 432       cerr << endl << "Supplied unit: \"" << supplied_units << "\" cannot be converted to "
 433                    << target_units << ". Add new unit conversion in FGXMLElement.cpp or fix typo" << endl;
 434       exit(-1);
 435     }
 436   }
 437
 438   double value = element->GetDataAsNumber();
 439   if (!supplied_units.empty()) {
 440     value *= convert[supplied_units][target_units];
 441   }
 442
 443   return value;
 444 }
 445
 446 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 447
 448 FGColumnVector3 Element::FindElementTripletConvertTo( const string& target_units)
 449 {
 450   FGColumnVector3 triplet;
 451   Element* item;
 452   double value=0.0;
 453   string supplied_units = GetAttributeValue("unit");
 454
 455   if (!supplied_units.empty()) {
 456     if (convert.find(supplied_units) == convert.end()) {
 457       cerr << endl << "Supplied unit: \"" << supplied_units << "\" does not exist (typo?). Add new unit"
 458            << " conversion in FGXMLElement.cpp." << endl;
 459       exit(-1);
 460     }
 461     if (convert[supplied_units].find(target_units) == convert[supplied_units].end()) {
 462       cerr << endl << "Supplied unit: \"" << supplied_units << "\" cannot be converted to "
 463                    << target_units << ". Add new unit conversion in FGXMLElement.cpp or fix typo" << endl;
 464       exit(-1);
 465     }
 466   }
 467
 468   item = FindElement("x");
 469   if (!item) item = FindElement("roll");
 470   if (item) {
 471     value = item->GetDataAsNumber();
 472     if (!supplied_units.empty()) value *= convert[supplied_units][target_units];
 473   } else {
 474     value = 0.0;
 475     cerr << "Could not find an X triplet item for this column vector." << endl;
 476   }
 477   triplet(1) = value;
 478
 479   item = FindElement("y");
 480   if (!item) item = FindElement("pitch");
 481   if (item) {
 482     value = item->GetDataAsNumber();
 483     if (!supplied_units.empty()) value *= convert[supplied_units][target_units];
 484   } else {
 485     value = 0.0;
 486     cerr << "Could not find a Y triplet item for this column vector." << endl;
 487   }
 488   triplet(2) = value;
 489
 490   item = FindElement("z");
 491   if (!item) item = FindElement("yaw");
 492   if (item) {
 493     value = item->GetDataAsNumber();
 494     if (!supplied_units.empty()) value *= convert[supplied_units][target_units];
 495   } else {
 496     value = 0.0;
 497     cerr << "Could not find a Z triplet item for this column vector." << endl;
 498   }
 499   triplet(3) = value;
 500
 501   return triplet;
 502 }
 503
 504 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 505
 506 void Element::Print(unsigned int level)
 507 {
 508   unsigned int i, spaces;
 509
 510   level+=2;
 511   for (spaces=0; spaces<=level; spaces++) cout << " "; // format output
 512   cout << "Element Name: " << name;
 513   for (i=0; i<attributes.size(); i++) {
 514     cout << "  " << attribute_key[i] << " = " << attributes[attribute_key[i]];
 515   }
 516   cout << endl;
 517   for (i=0; i<data_lines.size(); i++) {
 518     for (spaces=0; spaces<=level; spaces++) cout << " "; // format output
 519     cout << data_lines[i] << endl;
 520   }
 521   for (i=0; i<children.size(); i++) {
 522     children[i]->Print(level);
 523   }
 524 }
 525
 526 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 527
 528 void Element::AddAttribute(const string& name, const string& value)
 529 {
 530   attribute_key.push_back(name);
 531   attributes[name] = value;
 532 }
 533
 534 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 535
 536 void Element::AddData(string d)
 537 {
 538   string::size_type string_start = d.find_first_not_of(" \t");
 539   if (string_start != string::npos && string_start > 0) {
 540     d.erase(0,string_start);
 541   }
 542   data_lines.push_back(d);
 543 }
 544
 545 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 546
 547 } // end namespace JSBSim