js/pz2.js

   1 /*
   2 ** $Id: pz2.js,v 1.41 2007-07-02 10:16:46 jakub Exp $
   3 ** pz2.js - pazpar2's javascript client library.
   4 */
   5
   6 //since explorer is flawed
   7 if (!window['Node']) {
   8     window.Node = new Object();
   9     Node.ELEMENT_NODE = 1;
  10     Node.ATTRIBUTE_NODE = 2;
  11     Node.TEXT_NODE = 3;
  12     Node.CDATA_SECTION_NODE = 4;
  13     Node.ENTITY_REFERENCE_NODE = 5;
  14     Node.ENTITY_NODE = 6;
  15     Node.PROCESSING_INSTRUCTION_NODE = 7;
  16     Node.COMMENT_NODE = 8;
  17     Node.DOCUMENT_NODE = 9;
  18     Node.DOCUMENT_TYPE_NODE = 10;
  19     Node.DOCUMENT_FRAGMENT_NODE = 11;
  20     Node.NOTATION_NODE = 12;
  21 }
  22
  23 // prevent execution of more than once
  24 if(typeof window.pz2 == "undefined") {
  25 window.undefined = window.undefined;
  26
  27 var pz2 = function(paramArray) {
  28     //for convenience
  29     __myself = this;
  30
  31     //supported pazpar2's protocol version
  32     __myself.suppProtoVer = '1';
  33     __myself.pz2String = paramArray.pazpar2path || "search.pz2";
  34     __myself.stylesheet = paramArray.detailstylesheet || null;
  35     __myself.useSessions = true;
  36     if (paramArray.usesessions != undefined) {
  37          __myself.useSessions = paramArray.usesessions;
  38     }
  39
  40     //load stylesheet if required in async mode
  41     if( __myself.stylesheet ) {
  42         var request = new pzHttpRequest( __myself.stylesheet );
  43         request.async = false;
  44         request.get(
  45                 [],
  46                 function ( doc ) {
  47                     __myself.xslDoc = doc;
  48                 }
  49         );
  50     }
  51
  52     // at least one callback required
  53     if ( !paramArray )
  54         throw new Error("An array with parameters has to be suplied when instantiating a class");
  55
  56     __myself.errorHandler = paramArray.errorhandler || null;
  57
  58     // function callbacks
  59     __myself.statCallback = paramArray.onstat || null;
  60     __myself.showCallback = paramArray.onshow || null;
  61     __myself.termlistCallback = paramArray.onterm || null;
  62     __myself.recordCallback = paramArray.onrecord || null;
  63     __myself.bytargetCallback = paramArray.onbytarget || null;
  64     __myself.resetCallback = paramArray.onreset || null;
  65
  66     // termlist keys
  67     __myself.termKeys = paramArray.termlist || "subject";
  68
  69     // some configurational stuff
  70     __myself.keepAlive = 50000;
  71
  72     __myself.sessionID = null;
  73     __myself.initStatusOK = false;
  74     __myself.pingStatusOK = false;
  75     __myself.searchStatusOK = false;
  76
  77     if ( paramArray.keepAlive < __myself.keepAlive )
  78         __myself.keepAlive = paramArray.keepAlive;
  79
  80     // for sorting
  81     __myself.currentSort = "relevance";
  82     // where are we?
  83     __myself.currentStart = 0;
  84     __myself.currentNum = 20;
  85
  86     // last full record retrieved
  87     __myself.currRecID = null;
  88     // current query
  89     __myself.currQuery = null;
  90
  91     //timers
  92     __myself.statTime = paramArray.stattime || 1000;
  93     __myself.statTimer = null;
  94     __myself.termTime = paramArray.termtime || 1000;
  95     __myself.termTimer = null;
  96     __myself.showTime = paramArray.showtime || 1000;
  97     __myself.showTimer = null;
  98     __myself.showFastCount = 4;
  99     __myself.bytargetTime = paramArray.bytargettime || 1000;
 100     __myself.bytargetTimer = null;
 101
 102     // counters for each command and applied delay
 103     __myself.dumpFactor = 500;
 104     __myself.showCounter = 0;
 105     __myself.termCounter = 0;
 106     __myself.statCounter = 0;
 107     __myself.bytargetCounter = 0;
 108
 109     // active clients, updated by stat and show
 110     // might be an issue since bytarget will poll accordingly
 111     __myself.activeClients = 1;
 112
 113     // auto init session?
 114     if (paramArray.autoInit !== false)
 115         __myself.init();
 116 };
 117 pz2.prototype =
 118 {
 119    stop: function ()
 120    {
 121        clearTimeout(__myself.statTimer);
 122        clearTimeout(__myself.showTimer);
 123        clearTimeout(__myself.termTimer);
 124        clearTimeout(__myself.bytargetTimer);
 125     },
 126
 127     reset: function ()
 128     {
 129         __myself.sessionID = null;
 130         __myself.initStatusOK = false;
 131         __myself.pingStatusOK = false;
 132         __myself.searchStatusOK = false;
 133
 134         __myself.stop();
 135
 136         if ( __myself.resetCallback )
 137                 __myself.resetCallback();
 138     },
 139     init: function ( sessionId )
 140     {
 141         __myself.reset();
 142
 143         if ( sessionId != undefined ) {
 144             __myself.initStatusOK = true;
 145             __myself.sessionID = sessionId;
 146             __myself.ping();
 147         } else if (__myself.useSessions) {
 148             var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 149             request.get(
 150                 { "command": "init" },
 151                 function(data) {
 152                     if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 153                         if ( data.getElementsByTagName("protocol")[0].childNodes[0].nodeValue != __myself.suppProtoVer )
 154                             throw new Error("Server's protocol not supported by the client");
 155                         __myself.initStatusOK = true;
 156                         __myself.sessionID = data.getElementsByTagName("session")[0].childNodes[0].nodeValue;
 157                         setTimeout("__myself.ping()", __myself.keepAlive);
 158                     }
 159                     else
 160                         // if it gets here the http return code was 200 (pz2 errors are 417)
 161                         // but the response was invalid, it should never occur
 162                         setTimeout("__myself.init()", 1000);
 163                 }
 164             );
 165         } else {
 166             __myself.initStatusOK = true;
 167         }
 168     },
 169     // no need to ping explicitly
 170     ping: function ()
 171     {
 172         if( !__myself.initStatusOK )
 173             return;
 174             // session is not initialized code here
 175         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 176         request.get(
 177             { "command": "ping", "session": __myself.sessionID },
 178             function(data) {
 179                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 180                     __myself.pingStatusOK = true;
 181                     setTimeout("__myself.ping()", __myself.keepAlive);
 182                 }
 183                 else
 184                     // if it gets here the http return code was 200 (pz2 errors are 417)
 185                     // but the response was invalid, it should never occur
 186                     setTimeout("__myself.ping()", 1000);
 187             }
 188         );
 189     },
 190     search: function (query, num, sort, filter)
 191     {
 192         clearTimeout(__myself.statTimer);
 193         clearTimeout(__myself.showTimer);
 194         clearTimeout(__myself.termTimer);
 195         clearTimeout(__myself.bytargetTimer);
 196
 197         __myself.showCounter = 0;
 198         __myself.termCounter = 0;
 199         __myself.bytargetCounter = 0;
 200         __myself.statCounter = 0;
 201
 202         if( !__myself.initStatusOK )
 203             return;
 204
 205         if( query !== undefined )
 206             __myself.currQuery = query;
 207         else
 208             throw new Error("You need to supply query to the search command");
 209
 210         var searchParams = [{ "command": "search", "query": __myself.currQuery }];
 211         searchParams.push({"session":__myself.sessionID});
 212         if (filter !== undefined)
 213             searchParams.push({"filter": filter});
 214         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 215         request.get(
 216             searchParams,
 217             function(data) {
 218                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 219                     __myself.searchStatusOK = true;
 220                     //piggyback search
 221                     __myself.show(0, num, sort);
 222                     if ( __myself.statCallback )
 223                         __myself.stat();
 224                         //__myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
 225                     if ( __myself.termlistCallback )
 226                         __myself.termlist();
 227                         //__myself.termTimer = setTimeout("__myself.termlist()", __myself.termTime / 4);
 228                     if ( __myself.bytargetCallback )
 229                         __myself.bytarget();
 230                         //__myself.bytargetTimer = setTimeout("__myself.bytarget()", __myself.bytargetTime / 4);
 231                 }
 232                 else
 233                     // if it gets here the http return code was 200 (pz2 errors are 417)
 234                     // but the response was invalid, it should never occur
 235                     setTimeout("__myself.search(__myself.currQuery)", 500);
 236             }
 237         );
 238     },
 239     stat: function()
 240     {
 241         if( !__myself.initStatusOK )
 242             return;
 243         // if called explicitly takes precedence
 244         clearTimeout(__myself.statTimer);
 245         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 246         request.get(
 247             { "command": "stat", "session": __myself.sessionID },
 248             function(data) {
 249                 if ( data.getElementsByTagName("stat") ) {
 250                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 251                     __myself.activeClients = activeClients;
 252                     var stat = {
 253                     "activeclients": activeClients,
 254                     "hits": Number( data.getElementsByTagName("hits")[0].childNodes[0].nodeValue ),
 255                     "records": Number( data.getElementsByTagName("records")[0].childNodes[0].nodeValue ),
 256                     "clients": Number( data.getElementsByTagName("clients")[0].childNodes[0].nodeValue ),
 257                     "initializing": Number( data.getElementsByTagName("initializing")[0].childNodes[0].nodeValue ),
 258                     "searching": Number( data.getElementsByTagName("searching")[0].childNodes[0].nodeValue ),
 259                     "presenting": Number( data.getElementsByTagName("presenting")[0].childNodes[0].nodeValue ),
 260                     "idle": Number( data.getElementsByTagName("idle")[0].childNodes[0].nodeValue ),
 261                     "failed": Number( data.getElementsByTagName("failed")[0].childNodes[0].nodeValue ),
 262                     "error": Number( data.getElementsByTagName("error")[0].childNodes[0].nodeValue )
 263                     };
 264
 265                     __myself.statCounter++;
 266                     var delay = __myself.statTime + __myself.statCounter * __myself.dumpFactor;
 267                     if ( activeClients > 0 )
 268                         __myself.statTimer = setTimeout("__myself.stat()", delay);
 269
 270                     __myself.statCallback(stat);
 271                 }
 272                 else
 273                     // if it gets here the http return code was 200 (pz2 errors are 417)
 274                     // but the response was invalid, it should never occur
 275                     __myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
 276             }
 277         );
 278     },
 279     show: function(start, num, sort)
 280     {
 281         if( !__myself.searchStatusOK )
 282             return;
 283         // if called explicitly takes precedence
 284         clearTimeout(__myself.showTimer);
 285
 286         if( sort !== undefined )
 287             __myself.currentSort = sort;
 288         if( start !== undefined )
 289             __myself.currentStart = Number( start );
 290         if( num !== undefined )
 291             __myself.currentNum = Number( num );
 292         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 293         var context = this;
 294         request.get(
 295             { "command": "show", "session": __myself.sessionID, "start": __myself.currentStart,
 296               "num": __myself.currentNum, "sort": __myself.currentSort, "block": 1 },
 297             function(data) {
 298                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 299                     // first parse the status data send along with records
 300                     // this is strictly bound to the format
 301                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 302                     __myself.activeClients = activeClients;
 303                     var show = {
 304                     "activeclients": activeClients,
 305                     "merged": Number( data.getElementsByTagName("merged")[0].childNodes[0].nodeValue ),
 306                     "total": Number( data.getElementsByTagName("total")[0].childNodes[0].nodeValue ),
 307                     "start": Number( data.getElementsByTagName("start")[0].childNodes[0].nodeValue ),
 308                     "num": Number( data.getElementsByTagName("num")[0].childNodes[0].nodeValue ),
 309                     "hits": []
 310                     };
 311                     // parse all the first-level nodes for all <hit> tags
 312                     var hits = data.getElementsByTagName("hit");
 313                     var hit = new Array();
 314                     for (i = 0; i < hits.length; i++) {
 315                         show.hits[i] = new Array();
 316                         show.hits[i]['location'] = new Array();
 317                         for ( j = 0; j < hits[i].childNodes.length; j++) {
 318                             var locCount = 0;
 319                             if ( hits[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 320                                 if (hits[i].childNodes[j].nodeName == 'location') {
 321                                     var locNode = hits[i].childNodes[j];
 322                                     var id = locNode.getAttribute('id');
 323                                     show.hits[i]['location'][id] = {
 324                                         "id": locNode.getAttribute("id"),
 325                                         "name": locNode.getAttribute("name")
 326                                     };
 327                                 }
 328                                 else {
 329                                     var nodeName = hits[i].childNodes[j].nodeName;
 330                                     var nodeText = 'ERROR'
 331                                     if ( hits[i].childNodes[j].firstChild )
 332                                         nodeText = hits[i].childNodes[j].firstChild.nodeValue;
 333                                     show.hits[i][nodeName] = nodeText;
 334                                 }
 335                             }
 336                         }
 337                     }
 338                     __myself.showCounter++;
 339                     var delay = __myself.showTime;
 340                     if (__myself.showCounter > __myself.showFastCount)
 341                             delay += __myself.showCounter * __myself.dumpFactor;
 342                     if ( activeClients > 0 )
 343                         __myself.showTimer = setTimeout("__myself.show()", delay);
 344
 345                     __myself.showCallback(show);
 346                 }
 347                 else
 348                     // if it gets here the http return code was 200 (pz2 errors are 417)
 349                     // but the response was invalid, it should never occur
 350                     __myself.showTimer = setTimeout("__myself.show()", __myself.showTime / 4);
 351             }
 352         );
 353     },
 354     record: function(id)
 355     {
 356         if( !__myself.searchStatusOK )
 357             return;
 358
 359         if( id !== undefined )
 360             __myself.currRecID = id;
 361         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 362         request.get(
 363             { "command": "record", "session": __myself.sessionID, "id": __myself.currRecID },
 364             function(data) {
 365                 var recordNode;
 366                 var record = new Array();
 367                 if ( recordNode = data.getElementsByTagName("record")[0] ) {
 368                     // if stylesheet was fetched do not parse the response
 369                     if ( __myself.xslDoc ) {
 370                         record['recid'] = recordNode.getElementsByTagName("recid")[0].firstChild.nodeValue;
 371                         record['xmlDoc'] = data;
 372                         record['xslDoc'] = __myself.xslDoc;
 373                     } else {
 374                         for ( i = 0; i < recordNode.childNodes.length; i++) {
 375                             if ( recordNode.childNodes[i].nodeType == Node.ELEMENT_NODE
 376                                     && recordNode.childNodes[i].nodeName != 'location' ) {
 377                                 var nodeName = recordNode.childNodes[i].nodeName;
 378                                 var nodeText = recordNode.childNodes[i].firstChild.nodeValue;
 379                                 record[nodeName] = nodeText;
 380                             }
 381                         }
 382                         // the location might be empty!!
 383                         var locationNodes = recordNode.getElementsByTagName("location");
 384                         record["location"] = new Array();
 385                         for ( i = 0; i < locationNodes.length; i++ ) {
 386                             record["location"][i] = {
 387                                 "id": locationNodes[i].getAttribute("id"),
 388                                 "name": locationNodes[i].getAttribute("name")
 389                             };
 390
 391                             for ( j = 0; j < locationNodes[i].childNodes.length; j++) {
 392                                 if ( locationNodes[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 393                                     var nodeName = locationNodes[i].childNodes[j].nodeName;
 394                                     var nodeText = '';
 395                                     if (locationNodes[i].childNodes[j].firstChild)
 396                                             nodeText = locationNodes[i].childNodes[j].firstChild.nodeValue;
 397                                     record["location"][i][nodeName] = nodeText;
 398                                 }
 399                             }
 400                         }
 401                     }
 402
 403                     __myself.recordCallback(record);
 404                 }
 405                 else
 406                     // if it gets here the http return code was 200 (pz2 errors are 417)
 407                     // but the response was invalid, it should never occur
 408                     setTimeout("__myself.record(__myself.currRecID)", 500);
 409             }
 410         );
 411     },
 412     termlist: function()
 413     {
 414         if( !__myself.searchStatusOK )
 415             return;
 416         // if called explicitly takes precedence
 417         clearTimeout(__myself.termTimer);
 418         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 419         request.get(
 420             { "command": "termlist", "session": __myself.sessionID, "name": __myself.termKeys },
 421             function(data) {
 422                 if ( data.getElementsByTagName("termlist") ) {
 423                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 424                     __myself.activeClients = activeClients;
 425                     var termList = { "activeclients":  activeClients };
 426                     var termLists = data.getElementsByTagName("list");
 427                     //for each termlist
 428                     for (i = 0; i < termLists.length; i++) {
 429                         var listName = termLists[i].getAttribute('name');
 430                         termList[listName] = new Array();
 431                         var terms = termLists[i].getElementsByTagName('term');
 432                         //for each term in the list
 433                         for (j = 0; j < terms.length; j++) {
 434                             var term = {
 435                                 "name": (terms[j].getElementsByTagName("name")[0].childNodes.length
 436                                                 ? terms[j].getElementsByTagName("name")[0].childNodes[0].nodeValue
 437                                                 : 'ERROR'),
 438                                 "freq": terms[j].getElementsByTagName("frequency")[0].childNodes[0].nodeValue || 'ERROR'
 439                             };
 440
 441                             var termIdNode = terms[j].getElementsByTagName("id");
 442                             if(terms[j].getElementsByTagName("id").length)
 443                                 term["id"] = termIdNode[0].childNodes[0].nodeValue;
 444
 445                             termList[listName][j] = term;
 446                         }
 447                     }
 448
 449                     __myself.termCounter++;
 450                     var delay = __myself.termTime + __myself.termCounter * __myself.dumpFactor;
 451                     if ( activeClients > 0 )
 452                         __myself.termTimer = setTimeout("__myself.termlist()", delay);
 453
 454                    __myself.termlistCallback(termList);
 455                 }
 456                 else
 457                     // if it gets here the http return code was 200 (pz2 errors are 417)
 458                     // but the response was invalid, it should never occur
 459                     __myself.termTimer = setTimeout("__myself.termlist()", __myself.termTime / 4);
 460             }
 461         );
 462
 463     },
 464     bytarget: function()
 465     {
 466         if( !__myself.searchStatusOK )
 467             return;
 468         // if called explicitly takes precedence
 469         clearTimeout(__myself.bytargetTimer);
 470         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 471         request.get(
 472             { "command": "bytarget", "session": __myself.sessionID },
 473             function(data) {
 474                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 475                     var targetNodes = data.getElementsByTagName("target");
 476                     var bytarget = new Array();
 477                     for ( i = 0; i < targetNodes.length; i++) {
 478                         bytarget[i] = new Array();
 479                         for( j = 0; j < targetNodes[i].childNodes.length; j++ ) {
 480                             if ( targetNodes[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 481                                 var nodeName = targetNodes[i].childNodes[j].nodeName;
 482                                 var nodeText = targetNodes[i].childNodes[j].firstChild.nodeValue;
 483                                 bytarget[i][nodeName] = nodeText;
 484                             }
 485                         }
 486                     }
 487
 488                     __myself.bytargetCounter++;
 489                     var delay = __myself.bytargetTime + __myself.bytargetCounter * __myself.dumpFactor;
 490                     if ( __myself.activeClients > 0 )
 491                         __myself.bytargetTimer = setTimeout("__myself.bytarget()", delay);
 492
 493                     __myself.bytargetCallback(bytarget);
 494                 }
 495                 else
 496                     // if it gets here the http return code was 200 (pz2 errors are 417)
 497                     // but the response was invalid, it should never occur
 498                     __myself.bytargetTimer = setTimeout("__myself.bytarget()", __myself.bytargetTime / 4);
 499             }
 500         );
 501     },
 502     // just for testing, probably shouldn't be here
 503     showNext: function(page)
 504     {
 505         var step = page || 1;
 506         __myself.show( ( step * __myself.currentNum ) + __myself.currentStart );
 507     },
 508     showPrev: function(page)
 509     {
 510         if (__myself.currentStart == 0 )
 511             return false;
 512         var step = page || 1;
 513         var newStart = __myself.currentStart - (step * __myself.currentNum );
 514         __myself.show( newStart > 0 ? newStart : 0 );
 515     },
 516     showPage: function(pageNum)
 517     {
 518         //var page = pageNum || 1;
 519         __myself.show(pageNum * __myself.currentNum);
 520     }
 521 };
 522
 523 /*
 524 *********************************************************************************
 525 ** AJAX HELPER CLASS ************************************************************
 526 *********************************************************************************
 527 */
 528 var pzHttpRequest = function ( url, errorHandler ) {
 529         this.request = null;
 530         this.url = url;
 531         this.errorHandler = errorHandler || null;
 532         this.async = true;
 533
 534         if ( window.XMLHttpRequest ) {
 535             this.request = new XMLHttpRequest();
 536         } else if ( window.ActiveXObject ) {
 537             try {
 538                 this.request = new ActiveXObject( 'Msxml2.XMLHTTP' );
 539             } catch (err) {
 540                 this.request = new ActiveXObject( 'Microsoft.XMLHTTP' );
 541             }
 542         }
 543 };
 544
 545 pzHttpRequest.prototype =
 546 {
 547     get: function ( params, callback )
 548     {
 549         this._send( 'GET', params, null, callback );
 550     },
 551
 552     post: function ( params, data, callback )
 553     {
 554         this._send( 'POST', params, data, callback );
 555     },
 556
 557     _send: function ( type, params, data, callback )
 558     {
 559         this.callback = callback;
 560         var context = this;
 561         this.request.open( type, this._urlAppendParams(params), this.async );
 562         //this.request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
 563         this.request.onreadystatechange = function () {
 564             context._handleResponse();
 565         }
 566         this.request.send(data);
 567     },
 568
 569     _urlAppendParams: function (params)
 570     {
 571         var getUrl = this.url;
 572
 573         var sep = '?';
 574         var el = params;
 575         for (var key in el) {
 576             if (el[key] != null) {
 577                 getUrl += sep + key + '=' + encodeURI(el[key]);
 578                 sep = '&';
 579             }
 580         }
 581         return getUrl;
 582     },
 583
 584     _handleResponse: function ()
 585     {
 586         if ( this.request.readyState == 4 ) {
 587             if ( this.request.status == 200 ) {
 588                 this.callback( this.request.responseXML );
 589             }
 590             // pz errors
 591             else if ( this.request.status == 417 ) {
 592                 var errMsg = this.request.responseXML.getElementsByTagName("error")[0].childNodes[0].nodeValue;
 593                 var errCode = this.request.responseXML.getElementsByTagName("error")[0].getAttribute("code");
 594
 595                 var err = new Error(errMsg);
 596                 err.code = errCode;
 597
 598                 if (this.errorHandler) {
 599                     this.errorHandler(err);
 600                 }
 601                 else {
 602                     throw err;
 603                 }
 604             }
 605             else {
 606                 var err = new Error("XMLHttpRequest error. STATUS: "
 607                             + this.request.status + " STATUS TEXT: "
 608                             + this.request.statusText );
 609                 err.code = 'HTTP';
 610
 611                 if (this.errorHandler) {
 612                     this.errorHandler(err);
 613                 }
 614                 else {
 615                     throw err;
 616                 }
 617             }
 618         }
 619     }
 620 };
 621
 622 /*
 623 *********************************************************************************
 624 ** QUERY CLASS ******************************************************************
 625 *********************************************************************************
 626 */
 627 var pzQuery = function()
 628 {
 629     this.simpleQuery = '';
 630     this.singleFilter = null;
 631     this.advTerms = new Array();
 632     this.filterHash = new Array();
 633     this.numTerms = 0;
 634     this.filterNums = 0;
 635 };
 636 pzQuery.prototype = {
 637     reset: function()
 638     {
 639         this.simpleQuery = '';
 640         this.advTerms = new Array();
 641         this.simpleFilter = null;
 642         this.numTerms = 0;
 643     },
 644     clearSimpleQuery: function()
 645     {
 646         this.simpleQuery = '';
 647     },
 648     addTerm: function(field, value)
 649     {
 650         var term = {"field": field, "value": value};
 651         this.advTerms[this.numTerms] = term;
 652         this.numTerms++;
 653     },
 654     getTermValueByIdx: function(index)
 655     {
 656         return this.advTerms[index].value;
 657     },
 658     getTermFieldByIdx: function(index)
 659     {
 660         return this.advTerms[index].field;
 661     },
 662     /* semicolon separated list of terms for given field*/
 663     getTermsByField: function(field)
 664     {
 665         var terms = '';
 666         for(var i = 0; i < this.advTerms.length; i++)
 667         {
 668             if( this.advTerms[i].field == field )
 669                 terms = terms + this.queryHas[i].value + ';';
 670         }
 671         return terms;
 672     },
 673     addTermsFromList: function(inputString, field)
 674     {
 675         var inputArr = inputString.split(';');
 676         for(var i=0; i < inputArr.length; i++)
 677         {
 678             if(inputArr[i].length < 3) continue;
 679             this.advTerms[this.numTerms] = {"field": field, "value": inputArr[i] };
 680             this.numTerms++;
 681         }
 682     },
 683     removeTermByIdx: function(index)
 684     {
 685         this.advTerms.splice(index, 1);
 686         this.numTerms--;
 687     },
 688     toCCL: function()
 689     {
 690         var ccl = '';
 691         if( this.simpleQuery != '')
 692             ccl = this.simpleQuery;
 693         for(var i = 0; i < this.advTerms.length; i++)
 694         {
 695             if (ccl != '') ccl = ccl + ' and ';
 696             ccl = ccl + this.advTerms[i].field+'="'+this.advTerms[i].value+'"';
 697         }
 698         return ccl;
 699     },
 700     addFilter: function(name, value)
 701     {
 702         var filter = {"name": name, "id": value };
 703         this.filterHash[this.filterHash.length] = filter;
 704         this.filterNums++
 705         return  this.filterHash.length - 1;
 706     },
 707     setFilter: function(name, value)
 708     {
 709         this.filterHash = new Array();
 710         this.filterNums = 0;
 711         this.addFilter(name, value);
 712     },
 713     getFilter: function(index)
 714     {
 715         return this.filterHash[index].id;
 716     },
 717     getFilterName: function(index)
 718     {
 719         return this.filterHash[index].name;
 720     },
 721     removeFilter: function(index)
 722     {
 723         delete this.filterHash[index];
 724         this.filterNums--;
 725     },
 726     clearFilter: function()
 727     {
 728         this.filterHash = new Array();
 729         this.filterNums = 0;
 730     },
 731     getFilterString: function()
 732     {
 733         //temporary
 734         if( this.singleFilter != null ) {
 735             return 'pz:id='+this.singleFilter.id;
 736         }
 737         else if( this.filterNums <= 0 ) {
 738             return undefined;
 739         }
 740
 741         var filter = 'pz:id=';
 742         for(var i = 0; i < this.filterHash.length; i++)
 743         {
 744             if (this.filterHash[i] == undefined) continue;
 745             if (filter > 'pz:id=') filter = filter + '|';
 746             filter += this.filterHash[i].id;
 747         }
 748         return filter;
 749     },
 750     totalLength: function()
 751     {
 752         var simpleLength = this.simpleQuery != '' ? 1 : 0;
 753         return this.advTerms.length + simpleLength;
 754     },
 755     clearSingleFilter: function()
 756     {
 757         this.singleFilter = null;
 758     },
 759     setSingleFilter: function(name, value)
 760     {
 761         this.singleFilter = {"name": name, "id": value };
 762     },
 763     getSingleFilterName: function()
 764     {
 765         return this.singleFilter.name;
 766     }
 767 }
 768
 769 }