js/pz2.js

   1 /*
   2 ** $Id: pz2.js,v 1.31 2007-06-04 12:31:07 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 = "search.pz2";
  34     __myself.stylesheet = paramArray.detailstylesheet || null;
  35
  36     //load stylesheet if required in async mode
  37     if( __myself.stylesheet ) {
  38         var request = new pzHttpRequest( __myself.stylesheet );
  39         request.get(
  40                 {},
  41                 function ( doc ) {
  42                     __myself.xslDoc = doc;
  43                 }
  44         );
  45     }
  46
  47     // at least one callback required
  48     if ( !paramArray )
  49         throw new Error("An array with parameters has to be suplied when instantiating a class");
  50
  51     __myself.errorHandler = paramArray.errorhandler || null;
  52
  53     // function callbacks
  54     __myself.statCallback = paramArray.onstat || null;
  55     __myself.showCallback = paramArray.onshow || null;
  56     __myself.termlistCallback = paramArray.onterm || null;
  57     __myself.recordCallback = paramArray.onrecord || null;
  58     __myself.bytargetCallback = paramArray.onbytarget || null;
  59     __myself.resetCallback = paramArray.onreset || null;
  60
  61     // termlist keys
  62     __myself.termKeys = paramArray.termlist || "subject";
  63
  64     // some configurational stuff
  65     __myself.keepAlive = 50000;
  66
  67     __myself.sessionID = null;
  68     __myself.initStatusOK = false;
  69     __myself.pingStatusOK = false;
  70     __myself.searchStatusOK = false;
  71
  72     if ( paramArray.keepAlive < __myself.keepAlive )
  73         __myself.keepAlive = paramArray.keepAlive;
  74
  75     // for sorting
  76     __myself.currentSort = "relevance";
  77     // where are we?
  78     __myself.currentStart = 0;
  79     __myself.currentNum = 20;
  80
  81     // last full record retrieved
  82     __myself.currRecID = null;
  83     // current query
  84     __myself.currQuery = null;
  85
  86     //timers
  87     __myself.statTime = paramArray.stattime || 1000;
  88     __myself.statTimer = null;
  89     __myself.termTime = paramArray.termtime || 1000;
  90     __myself.termTimer = null;
  91     __myself.showTime = paramArray.showtime || 1000;
  92     __myself.showTimer = null;
  93     __myself.showFastCount = 4;
  94     __myself.bytargetTime = paramArray.bytargettime || 1000;
  95     __myself.bytargetTimer = null;
  96
  97     // counters for each command and applied delay
  98     __myself.dumpFactor = 500;
  99     __myself.showCounter = 0;
 100     __myself.termCounter = 0;
 101     __myself.statCounter = 0;
 102     __myself.bytargetCounter = 0;
 103
 104     // active clients, updated by stat and show
 105     // might be an issue since bytarget will poll accordingly
 106     __myself.activeClients = 1;
 107
 108     // auto init session?
 109     if (paramArray.autoInit !== false)
 110         __myself.init();
 111 };
 112 pz2.prototype = {
 113     reset: function ()
 114     {
 115         __myself.sessionID = null;
 116         __myself.initStatusOK = false;
 117         __myself.pingStatusOK = false;
 118         __myself.searchStatusOK = false;
 119
 120         clearTimeout(__myself.statTimer);
 121         clearTimeout(__myself.showTimer);
 122         clearTimeout(__myself.termTimer);
 123         clearTimeout(__myself.bytargetTimer);
 124
 125         if ( __myself.resetCallback )
 126                 __myself.resetCallback();
 127     },
 128     init: function ( sessionId )
 129     {
 130         __myself.reset();
 131         if ( sessionId != undefined ) {
 132             __myself.initStatusOK = true;
 133             __myself.sessionID = sessionId;
 134             __myself.ping();
 135
 136         } else {
 137             var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 138             request.get(
 139                 { "command": "init" },
 140                 function(data) {
 141                     if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 142                         if ( data.getElementsByTagName("protocol")[0].childNodes[0].nodeValue != __myself.suppProtoVer )
 143                             throw new Error("Server's protocol not supported by the client");
 144                         __myself.initStatusOK = true;
 145                         __myself.sessionID = data.getElementsByTagName("session")[0].childNodes[0].nodeValue;
 146                         setTimeout("__myself.ping()", __myself.keepAlive);
 147                     }
 148                     else
 149                         // if it gets here the http return code was 200 (pz2 errors are 417)
 150                         // but the response was invalid, it should never occur
 151                         setTimeout("__myself.init()", 1000);
 152                 }
 153             );
 154         }
 155     },
 156     // no need to ping explicitly
 157     ping: function ()
 158     {
 159         if( !__myself.initStatusOK )
 160             return;
 161             // session is not initialized code here
 162         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 163         request.get(
 164             { "command": "ping", "session": __myself.sessionID },
 165             function(data) {
 166                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 167                     __myself.pingStatusOK = true;
 168                     setTimeout("__myself.ping()", __myself.keepAlive);
 169                 }
 170                 else
 171                     // if it gets here the http return code was 200 (pz2 errors are 417)
 172                     // but the response was invalid, it should never occur
 173                     setTimeout("__myself.ping()", 1000);
 174             }
 175         );
 176     },
 177     search: function (query, num, sort, filter)
 178     {
 179         clearTimeout(__myself.statTimer);
 180         clearTimeout(__myself.showTimer);
 181         clearTimeout(__myself.termTimer);
 182         clearTimeout(__myself.bytargetTimer);
 183
 184         __myself.showCounter = 0;
 185         __myself.termCounter = 0;
 186         __myself.bytargetCounter = 0;
 187         __myself.statCounter = 0;
 188
 189         if( !__myself.initStatusOK )
 190             return;
 191
 192         if( query !== undefined )
 193             __myself.currQuery = query;
 194         else
 195             throw new Error("You need to supply query to the search command");
 196
 197         if( filter !== undefined )
 198             var searchParams = { "command": "search", "session": __myself.sessionID, "query": __myself.currQuery, "filter": filter };
 199         else
 200             var searchParams = { "command": "search", "session": __myself.sessionID, "query": __myself.currQuery };
 201         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 202         request.get(
 203             searchParams,
 204             function(data) {
 205                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 206                     __myself.searchStatusOK = true;
 207                     //piggyback search
 208                     __myself.show(0, num, sort);
 209                     if ( __myself.statCallback )
 210                         __myself.stat();
 211                         //__myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
 212                     if ( __myself.termlistCallback )
 213                         __myself.termlist();
 214                         //__myself.termTimer = setTimeout("__myself.termlist()", __myself.termTime / 4);
 215                     if ( __myself.bytargetCallback )
 216                         __myself.bytarget();
 217                         //__myself.bytargetTimer = setTimeout("__myself.bytarget()", __myself.bytargetTime / 4);
 218                 }
 219                 else
 220                     // if it gets here the http return code was 200 (pz2 errors are 417)
 221                     // but the response was invalid, it should never occur
 222                     setTimeout("__myself.search(__myself.currQuery)", 500);
 223             }
 224         );
 225     },
 226     stat: function()
 227     {
 228         if( !__myself.initStatusOK )
 229             return;
 230         // if called explicitly takes precedence
 231         clearTimeout(__myself.statTimer);
 232         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 233         request.get(
 234             { "command": "stat", "session": __myself.sessionID },
 235             function(data) {
 236                 if ( data.getElementsByTagName("stat") ) {
 237                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 238                     __myself.activeClients = activeClients;
 239                     var stat = {
 240                     "activeclients": activeClients,
 241                     "hits": Number( data.getElementsByTagName("hits")[0].childNodes[0].nodeValue ),
 242                     "records": Number( data.getElementsByTagName("records")[0].childNodes[0].nodeValue ),
 243                     "clients": Number( data.getElementsByTagName("clients")[0].childNodes[0].nodeValue ),
 244                     "initializing": Number( data.getElementsByTagName("initializing")[0].childNodes[0].nodeValue ),
 245                     "searching": Number( data.getElementsByTagName("searching")[0].childNodes[0].nodeValue ),
 246                     "presenting": Number( data.getElementsByTagName("presenting")[0].childNodes[0].nodeValue ),
 247                     "idle": Number( data.getElementsByTagName("idle")[0].childNodes[0].nodeValue ),
 248                     "failed": Number( data.getElementsByTagName("failed")[0].childNodes[0].nodeValue ),
 249                     "error": Number( data.getElementsByTagName("error")[0].childNodes[0].nodeValue )
 250                     };
 251
 252                     __myself.statCounter++;
 253                     var delay = __myself.statTime + __myself.statCounter * __myself.dumpFactor;
 254                     if ( activeClients > 0 )
 255                         __myself.statTimer = setTimeout("__myself.stat()", delay);
 256
 257                     __myself.statCallback(stat);
 258                 }
 259                 else
 260                     // if it gets here the http return code was 200 (pz2 errors are 417)
 261                     // but the response was invalid, it should never occur
 262                     __myself.statTimer = setTimeout("__myself.stat()", __myself.statTime / 4);
 263             }
 264         );
 265     },
 266     show: function(start, num, sort)
 267     {
 268         if( !__myself.searchStatusOK )
 269             return;
 270         // if called explicitly takes precedence
 271         clearTimeout(__myself.showTimer);
 272
 273         if( sort !== undefined )
 274             __myself.currentSort = sort;
 275         if( start !== undefined )
 276             __myself.currentStart = Number( start );
 277         if( num !== undefined )
 278             __myself.currentNum = Number( num );
 279         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 280         var context = this;
 281         request.get(
 282             { "command": "show", "session": __myself.sessionID, "start": __myself.currentStart,
 283               "num": __myself.currentNum, "sort": __myself.currentSort, "block": 1 },
 284             function(data) {
 285                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 286                     // first parse the status data send along with records
 287                     // this is strictly bound to the format
 288                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 289                     __myself.activeClients = activeClients;
 290                     var show = {
 291                     "activeclients": activeClients,
 292                     "merged": Number( data.getElementsByTagName("merged")[0].childNodes[0].nodeValue ),
 293                     "total": Number( data.getElementsByTagName("total")[0].childNodes[0].nodeValue ),
 294                     "start": Number( data.getElementsByTagName("start")[0].childNodes[0].nodeValue ),
 295                     "num": Number( data.getElementsByTagName("num")[0].childNodes[0].nodeValue ),
 296                     "hits": []
 297                     };
 298                     // parse all the first-level nodes for all <hit> tags
 299                     var hits = data.getElementsByTagName("hit");
 300                     var hit = new Array();
 301                     for (i = 0; i < hits.length; i++) {
 302                         show.hits[i] = new Array();
 303                         show.hits[i]['location'] = new Array();
 304                         for ( j = 0; j < hits[i].childNodes.length; j++) {
 305                             var locCount = 0;
 306                             if ( hits[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 307                                 if (hits[i].childNodes[j].nodeName == 'location') {
 308                                     var locNode = hits[i].childNodes[j];
 309                                     var id = locNode.getAttribute('id');
 310                                     show.hits[i]['location'][id] = {
 311                                         "id": locNode.getAttribute("id"),
 312                                         "name": locNode.getAttribute("name")
 313                                     };
 314                                 }
 315                                 else {
 316                                     var nodeName = hits[i].childNodes[j].nodeName;
 317                                     var nodeText = hits[i].childNodes[j].firstChild.nodeValue;
 318                                     show.hits[i][nodeName] = nodeText;
 319                                 }
 320                             }
 321                         }
 322                     }
 323                     __myself.showCounter++;
 324                     var delay = __myself.showTime;
 325                     if (__myself.showCounter > __myself.showFastCount)
 326                             delay += __myself.showCounter * __myself.dumpFactor;
 327                     if ( activeClients > 0 )
 328                         __myself.showTimer = setTimeout("__myself.show()", delay);
 329
 330                     __myself.showCallback(show);
 331                 }
 332                 else
 333                     // if it gets here the http return code was 200 (pz2 errors are 417)
 334                     // but the response was invalid, it should never occur
 335                     __myself.showTimer = setTimeout("__myself.show()", __myself.showTime / 4);
 336             }
 337         );
 338     },
 339     record: function(id)
 340     {
 341         if( !__myself.searchStatusOK )
 342             return;
 343
 344         if( id !== undefined )
 345             __myself.currRecID = id;
 346         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 347         request.get(
 348             { "command": "record", "session": __myself.sessionID, "id": __myself.currRecID },
 349             function(data) {
 350                 var recordNode;
 351                 var record = new Array();
 352                 if ( recordNode = data.getElementsByTagName("record")[0] ) {
 353                     // if stylesheet was fetched do not parse the response
 354                     if ( __myself.xslDoc ) {
 355                         record['recid'] = recordNode.getElementsByTagName("recid")[0].firstChild.nodeValue;
 356                         record['xmlDoc'] = data;
 357                         record['xslDoc'] = __myself.xslDoc;
 358                     } else {
 359                         for ( i = 0; i < recordNode.childNodes.length; i++) {
 360                             if ( recordNode.childNodes[i].nodeType == Node.ELEMENT_NODE
 361                                     && recordNode.childNodes[i].nodeName != 'location' ) {
 362                                 var nodeName = recordNode.childNodes[i].nodeName;
 363                                 var nodeText = recordNode.childNodes[i].firstChild.nodeValue;
 364                                 record[nodeName] = nodeText;
 365                             }
 366                         }
 367                         // the location might be empty!!
 368                         var locationNodes = recordNode.getElementsByTagName("location");
 369                         record["location"] = new Array();
 370                         for ( i = 0; i < locationNodes.length; i++ ) {
 371                             record["location"][i] = {
 372                                 "id": locationNodes[i].getAttribute("id"),
 373                                 "name": locationNodes[i].getAttribute("name")
 374                             };
 375
 376                             for ( j = 0; j < locationNodes[i].childNodes.length; j++) {
 377                                 if ( locationNodes[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 378                                     var nodeName = locationNodes[i].childNodes[j].nodeName;
 379                                     var nodeText = '';
 380                                     if (locationNodes[i].childNodes[j].firstChild)
 381                                             nodeText = locationNodes[i].childNodes[j].firstChild.nodeValue;
 382                                     record["location"][i][nodeName] = nodeText;
 383                                 }
 384                             }
 385                         }
 386                     }
 387
 388                     __myself.recordCallback(record);
 389                 }
 390                 else
 391                     // if it gets here the http return code was 200 (pz2 errors are 417)
 392                     // but the response was invalid, it should never occur
 393                     setTimeout("__myself.record(__myself.currRecID)", 500);
 394             }
 395         );
 396     },
 397     termlist: function()
 398     {
 399         if( !__myself.searchStatusOK )
 400             return;
 401         // if called explicitly takes precedence
 402         clearTimeout(__myself.termTimer);
 403         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 404         request.get(
 405             { "command": "termlist", "session": __myself.sessionID, "name": __myself.termKeys },
 406             function(data) {
 407                 if ( data.getElementsByTagName("termlist") ) {
 408                     var activeClients = Number( data.getElementsByTagName("activeclients")[0].childNodes[0].nodeValue );
 409                     __myself.activeClients = activeClients;
 410                     var termList = { "activeclients":  activeClients };
 411                     var termLists = data.getElementsByTagName("list");
 412                     //for each termlist
 413                     for (i = 0; i < termLists.length; i++) {
 414                         var listName = termLists[i].getAttribute('name');
 415                         termList[listName] = new Array();
 416                         var terms = termLists[i].getElementsByTagName('term');
 417                         //for each term in the list
 418                         for (j = 0; j < terms.length; j++) {
 419                             var term = {
 420                                 "name": (terms[j].getElementsByTagName("name")[0].childNodes.length
 421                                                 ? terms[j].getElementsByTagName("name")[0].childNodes[0].nodeValue
 422                                                 : 'ERROR'),
 423                                 "freq": terms[j].getElementsByTagName("frequency")[0].childNodes[0].nodeValue || 'ERROR'
 424                             };
 425
 426                             var termIdNode = terms[j].getElementsByTagName("id");
 427                             if(terms[j].getElementsByTagName("id").length)
 428                                 term["id"] = termIdNode[0].childNodes[0].nodeValue;
 429
 430                             termList[listName][j] = term;
 431                         }
 432                     }
 433
 434                     __myself.termCounter++;
 435                     var delay = __myself.termTime + __myself.termCounter * __myself.dumpFactor;
 436                     if ( activeClients > 0 )
 437                         __myself.termTimer = setTimeout("__myself.termlist()", delay);
 438
 439                    __myself.termlistCallback(termList);
 440                 }
 441                 else
 442                     // if it gets here the http return code was 200 (pz2 errors are 417)
 443                     // but the response was invalid, it should never occur
 444                     __myself.termTimer = setTimeout("__myself.termlist()", __myself.termTime / 4);
 445             }
 446         );
 447
 448     },
 449     bytarget: function()
 450     {
 451         if( !__myself.searchStatusOK )
 452             return;
 453         // if called explicitly takes precedence
 454         clearTimeout(__myself.bytargetTimer);
 455         var request = new pzHttpRequest(__myself.pz2String, __myself.errorHandler);
 456         request.get(
 457             { "command": "bytarget", "session": __myself.sessionID },
 458             function(data) {
 459                 if ( data.getElementsByTagName("status")[0].childNodes[0].nodeValue == "OK" ) {
 460                     var targetNodes = data.getElementsByTagName("target");
 461                     var bytarget = new Array();
 462                     for ( i = 0; i < targetNodes.length; i++) {
 463                         bytarget[i] = new Array();
 464                         for( j = 0; j < targetNodes[i].childNodes.length; j++ ) {
 465                             if ( targetNodes[i].childNodes[j].nodeType == Node.ELEMENT_NODE ) {
 466                                 var nodeName = targetNodes[i].childNodes[j].nodeName;
 467                                 var nodeText = targetNodes[i].childNodes[j].firstChild.nodeValue;
 468                                 bytarget[i][nodeName] = nodeText;
 469                             }
 470                         }
 471                     }
 472
 473                     __myself.bytargetCounter++;
 474                     var delay = __myself.bytargetTime + __myself.bytargetCounter * __myself.dumpFactor;
 475                     if ( __myself.activeClients > 0 )
 476                         __myself.bytargetTimer = setTimeout("__myself.bytarget()", delay);
 477
 478                     __myself.bytargetCallback(bytarget);
 479                 }
 480                 else
 481                     // if it gets here the http return code was 200 (pz2 errors are 417)
 482                     // but the response was invalid, it should never occur
 483                     __myself.bytargetTimer = setTimeout("__myself.bytarget()", __myself.bytargetTime / 4);
 484             }
 485         );
 486     },
 487     // just for testing, probably shouldn't be here
 488     showNext: function(page)
 489     {
 490         var step = page || 1;
 491         __myself.show( ( step * __myself.currentNum ) + __myself.currentStart );
 492     },
 493     showPrev: function(page)
 494     {
 495         if (__myself.currentStart == 0 )
 496             return false;
 497         var step = page || 1;
 498         var newStart = __myself.currentStart - (step * __myself.currentNum );
 499         __myself.show( newStart > 0 ? newStart : 0 );
 500     },
 501     showPage: function(pageNum)
 502     {
 503         //var page = pageNum || 1;
 504         __myself.show(pageNum * __myself.currentNum);
 505     }
 506 };
 507
 508 /*
 509 *********************************************************************************
 510 ** AJAX HELPER CLASS ************************************************************
 511 *********************************************************************************
 512 */
 513 var pzHttpRequest = function ( url, errorHandler ) {
 514         this.request = null;
 515         this.url = url;
 516         this.errorHandler = errorHandler || null;
 517
 518         if ( window.XMLHttpRequest ) {
 519             this.request = new XMLHttpRequest();
 520         } else if ( window.ActiveXObject ) {
 521             try {
 522                 this.request = new ActiveXObject( 'Msxml2.XMLHTTP' );
 523             } catch (err) {
 524                 this.request = new ActiveXObject( 'Microsoft.XMLHTTP' );
 525             }
 526         }
 527 };
 528
 529 pzHttpRequest.prototype =
 530 {
 531     get: function ( params, callback )
 532     {
 533         this.callback = callback;
 534
 535         var getUrl = this.url;
 536         var paramArr = new Array();
 537
 538         for ( var key in params ) {
 539             paramArr.push(key + '=' + encodeURI(params[key]) );
 540         }
 541
 542         if ( paramArr.length )
 543             getUrl += '?' + paramArr.join('&');
 544
 545         var context = this;
 546         this.request.open( 'GET', getUrl, true );
 547         this.request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
 548         //this.request.setRequestHeader('Accept-Charset', 'UTF-8');
 549         this.request.onreadystatechange = function () {
 550             context._handleResponse();
 551         }
 552         this.request.send(null);
 553     },
 554
 555     _handleResponse: function ()
 556     {
 557         if ( this.request.readyState == 4 ) {
 558             if ( this.request.status == 200 ) {
 559                 this.callback( this.request.responseXML );
 560             }
 561             // pz errors
 562             else if ( this.request.status == 417 ) {
 563                 var errMsg = this.request.responseXML.getElementsByTagName("error")[0].childNodes[0].nodeValue;
 564                 var errCode = this.request.responseXML.getElementsByTagName("error")[0].getAttribute("code");
 565
 566                 var err = new Error(errMsg);
 567                 err.code = errCode;
 568
 569                 if (this.errorHandler) {
 570                     this.errorHandler(err);
 571                 }
 572                 else {
 573                     throw err;
 574                 }
 575             }
 576             else {
 577                 var err = new Error("XMLHttpRequest error. STATUS: "
 578                             + this.request.status + " STATUS TEXT: "
 579                             + this.request.statusText );
 580                 err.code = 'HTTP';
 581
 582                 if (this.errorHandler) {
 583                     this.errorHandler(err);
 584                 }
 585                 else {
 586                     throw err;
 587                 }
 588             }
 589         }
 590     }
 591 };
 592
 593 /*
 594 *********************************************************************************
 595 ** QUERY CLASS ******************************************************************
 596 *********************************************************************************
 597 */
 598 var pzQuery = function()
 599 {
 600     this.simpleQuery = '';
 601     this.singleFilter = null;
 602     this.advTerms = new Array();
 603     this.filterHash = new Array();
 604     this.numTerms = 0;
 605     this.filterNums = 0;
 606 };
 607 pzQuery.prototype = {
 608     reset: function()
 609     {
 610         this.simpleQuery = '';
 611         this.advTerms = new Array();
 612         this.simpleFilter = null;
 613         this.numTerms = 0;
 614     },
 615     addTerm: function(field, value)
 616     {
 617         var term = {"field": field, "value": value};
 618         this.advTerms[this.numTerms] = term;
 619         this.numTerms++;
 620     },
 621     getTermValueByIdx: function(index)
 622     {
 623         return this.advTerms[index].value;
 624     },
 625     getTermFieldByIdx: function(index)
 626     {
 627         return this.advTerms[index].field;
 628     },
 629     /* semicolon separated list of terms for given field*/
 630     getTermsByField: function(field)
 631     {
 632         var terms = '';
 633         for(var i = 0; i < this.advTerms.length; i++)
 634         {
 635             if( this.advTerms[i].field == field )
 636                 terms = terms + this.queryHas[i].value + ';';
 637         }
 638         return terms;
 639     },
 640     addTermsFromList: function(inputString, field)
 641     {
 642         var inputArr = inputString.split(';');
 643         for(var i=0; i < inputArr.length; i++)
 644         {
 645             if(inputArr[i].length < 3) continue;
 646             this.advTerms[this.numTerms] = {"field": field, "value": inputArr[i] };
 647             this.numTerms++;
 648         }
 649     },
 650     removeTermByIdx: function(index)
 651     {
 652         this.advTerms.splice(index, 1);
 653         this.numTerms--;
 654     },
 655     toCCL: function()
 656     {
 657         var ccl = '';
 658         if( this.simpleQuery != '')
 659             ccl = this.simpleQuery;
 660         for(var i = 0; i < this.advTerms.length; i++)
 661         {
 662             if (ccl != '') ccl = ccl + ' and ';
 663             ccl = ccl + this.advTerms[i].field+'="'+this.advTerms[i].value+'"';
 664         }
 665         return ccl;
 666     },
 667     addFilter: function(name, value)
 668     {
 669         var filter = {"name": name, "id": value };
 670         this.filterHash[this.filterHash.length] = filter;
 671         this.filterNums++
 672         return  this.filterHash.length - 1;
 673     },
 674     setFilter: function(name, value)
 675     {
 676         this.filterHash = new Array();
 677         this.filterNums = 0;
 678         this.addFilter(name, value);
 679     },
 680     getFilter: function(index)
 681     {
 682         return this.filterHash[index].id;
 683     },
 684     getFilterName: function(index)
 685     {
 686         return this.filterHash[index].name;
 687     },
 688     removeFilter: function(index)
 689     {
 690         delete this.filterHash[index];
 691         this.filterNums--;
 692     },
 693     clearFilter: function()
 694     {
 695         this.filterHash = new Array();
 696         this.filterNums = 0;
 697     },
 698     getFilterString: function()
 699     {
 700         //temporary
 701         if( this.singleFilter != null ) {
 702             return 'pz:id='+this.singleFilter.id;
 703         }
 704         else if( this.filterNums <= 0 ) {
 705             return undefined;
 706         }
 707
 708         var filter = 'pz:id=';
 709         for(var i = 0; i < this.filterHash.length; i++)
 710         {
 711             if (this.filterHash[i] == undefined) continue;
 712             if (filter > 'pz:id=') filter = filter + '|';
 713             filter += this.filterHash[i].id;
 714         }
 715         return filter;
 716     },
 717     totalLength: function()
 718     {
 719         var simpleLength = this.simpleQuery != '' ? 1 : 0;
 720         return this.advTerms.length + simpleLength;
 721     },
 722     clearSingleFilter: function()
 723     {
 724         this.singleFilter = null;
 725     },
 726     setSingleFilter: function(name, value)
 727     {
 728         this.singleFilter = {"name": name, "id": value };
 729     },
 730     getSingleFilterName: function()
 731     {
 732         return this.singleFilter.name;
 733     }
 734 }
 735
 736 }