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# ResourceFactory.php

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    00001 <?PHP
    00002
    00003 #
    00004 #   FILE:  SPT--ResourceFactory.php
    00005 #
    00006 #   METHODS PROVIDED:
    00007 #       ResourceFactory()
    00008 #           - constructor
    00009 #       DuplicateResource($ResourceId)
    00010 #           - create duplicate resource and return to caller
    00011 #       (SEE ALSO:  SPT--ItemFactory.php)
    00012 #
    00013 #   AUTHOR:  Edward Almasy
    00014 #
    00015 #   Part of the Scout Portal Toolkit
    00016 #   Copyright 2003 Internet Scout Project
    00017 #   http://scout.wisc.edu
    00018 #
    00019
    00020
    00021 class ResourceFactory extends ItemFactory {
    00022
    00023     # ---- PUBLIC INTERFACE --------------------------------------------------
    00024
    00025     # object constructor
    00026     function ResourceFactory()
    00027     {
    00028         # set up item factory base class
    00029         $this->ItemFactory("Resource", "Resources", "ResourceId");
    00030     }
    00031
    00032     # create duplicate resource and return to caller
    00033     function DuplicateResource($ResourceId)
    00034     {
    00035         # create new target resource
    00036         $DstResource = new Resource();
    00037
    00038         # load up resource to duplicate
    00039         $SrcResource = new Resource($ResourceId);
    00040
    00041         # if resource to duplicate was found
    00042         if ($SrcResource->Status() > 0)
    00043         {
    00044             # for each metadata field
    00045             $Schema = new MetadataSchema();
    00046             $Fields = $Schema->GetFields();
    00047             foreach ($Fields as $Field)
    00048             {
    00049                 # copy values from old resource to new resource (except for cumulative rating)
    00050                 if ($Field->Name() != "Cumulative Rating")
    00051                 {
    00052                     $DstResource->SetByField($Field, $SrcResource->GetByField($Field, TRUE));
    00053                 }
    00054             }
    00055         }
    00056
    00057         # return new resource to caller
    00058         return $DstResource;
    00059     }
    00060
    00061     # clear or change specific qualifier for all resources
    00062     function ClearQualifier($ObjectOrId, $NewObjectOrId = NULL)
    00063     {
    00064         # sanitize qualifier ID or retrieve from object
    00065         $QualifierId = is_object($ObjectOrId)
    00066                 ?  $ObjectOrId->Id() : intval($ObjectOrId);
    00067
    00068         # if new qualifier passed in
    00069         if ($NewObjectOrId !== NULL)
    00070         {
    00071             # sanitize qualifier ID to change to or retrieve it from object
    00072             $NewQualifierIdVal = is_object($NewObjectOrId)
    00073                     ?  $NewObjectOrId->Id() : intval($NewObjectOrId);
    00074         }
    00075         else
    00076         {
    00077             # qualifier should be cleared
    00078             $NewQualifierIdVal = "NULL";
    00079         }
    00080
    00081         # for each metadata field
    00082         $Schema = new MetadataSchema();
    00083         $Fields = $Schema->GetFields();
    00084         foreach ($Fields as $Field)
    00085         {
    00086             # if field uses qualifiers and uses item-level qualifiers
    00087             $QualColName = $Field->DBFieldName()."Qualifier";
    00088             if ($Field->UsesQualifiers()
    00089                 && $Field->HasItemLevelQualifiers()
    00090                 && $this->DB->FieldExists("Resources", $QualColName))
    00091             {
    00092                 # set all occurrences to new qualifier value
    00093                 $this->DB->Query("UPDATE Resources"
    00094                            ." SET ".$QualColName." = ".$NewQualifierIdVal.""
    00095                            ." WHERE ".$QualColName." = '".$QualifierId."'");
    00096             }
    00097         }
    00098
    00099         # clear or change qualifier association with controlled names
    00100         # (NOTE: this should probably be done in a controlled name factory object)
    00101         $this->DB->Query("UPDATE ControlledNames"
    00102                    ." SET QualifierId = ".$NewQualifierIdVal
    00103                    ." WHERE QualifierId = '".$QualifierId."'");
    00104
    00105         # clear or change qualifier association with classifications
    00106         # (NOTE: this should probably be done in a classification factory object)
    00107         $this->DB->Query("UPDATE Classifications"
    00108                    ." SET QualifierId = ".$NewQualifierIdVal
    00109                    ." WHERE QualifierId = '".$QualifierId."'");
    00110     }
    00111
    00112     # return count of rated resources
    00113     function GetRatedResourceCount()
    00114     {
    00115         $RatedResourceCount = $this->DB->Query(
    00116                 "SELECT COUNT(DISTINCT ResourceId) AS ResourceCount "
    00117                 ."FROM ResourceRatings", "ResourceCount");
    00118         return $RatedResourceCount;
    00119     }
    00120
    00121     # return count of users who have rated resources
    00122     function GetRatedResourceUserCount()
    00123     {
    00124         $RatedResourceCount = $this->DB->Query(
    00125                 "SELECT COUNT(DISTINCT UserId) AS UserCount "
    00126                 ."FROM ResourceRatings", "UserCount");
    00127         return $RatedResourceCount;
    00128     }
    00129
    00130     # return recently released resources
    00131     function GetRecentlyReleasedResources($Count = 10, $Offset = 0, $MaxDaysToGoBack = 90)
    00132     {
    00133         # assume that no resources will be found
    00134         $Resources = array();
    00135
    00136         # calculate cutoff date for resources
    00137         $CutoffDate = date("Y-m-d H:i:s", strtotime($MaxDaysToGoBack." days ago"));
    00138
    00139         # query for resource IDs
    00140         $this->DB->Query("SELECT ResourceId FROM Resources WHERE"
    00141                 ." DateOfRecordRelease > '".$CutoffDate."'"
    00142                 ." AND ReleaseFlag = 1"
    00143                 ." AND ResourceId >= 0"
    00144                 ." ORDER BY DateOfRecordRelease DESC, DateOfRecordCreation DESC"
    00145                 ." LIMIT ".intval($Offset).", ".intval($Count));
    00146         $ResourceIds = $this->DB->FetchColumn("ResourceId");
    00147
    00148         # for each resource ID found
    00149         foreach ($ResourceIds as $ResourceId)
    00150         {
    00151             # load resource and add to list of found resources
    00152             $Resources[$ResourceId] = new Resource($ResourceId);
    00153         }
    00154
    00155         # return found resources to caller
    00156         return $Resources;
    00157     }
    00158
    00159     # return resources sorted by specified field
    00160     function GetResourceIdsSortedBy($FieldName, $Ascending = TRUE, $Limit = NULL)
    00161     {
    00162         # assume no resources will be found
    00163         $ResourceIds = array();
    00164
    00165         # get field
    00166         $Schema = new MetadataSchema();
    00167         $Field = $Schema->GetFieldByName($FieldName);
    00168
    00169         # if field was found
    00170         if ($Field != NULL)
    00171         {
    00172             # construct query based on field type
    00173             switch ($Field->Type())
    00174             {
    00175                 case MetadataSchema::MDFTYPE_TEXT:
    00176                 case MetadataSchema::MDFTYPE_PARAGRAPH:
    00177                 case MetadataSchema::MDFTYPE_URL:
    00178                     $Count = $this->DB->Query("SELECT COUNT(*) AS ResourceCount"
    00179                             ." FROM Resources WHERE "
    00180                             .$Field->DBFieldName()." IS NOT NULL"
    00181                             ." AND LENGTH(LTRIM(RTRIM(".$Field->DBFieldName()."))) > 0",
    00182                             "ResourceCount");
    00183                     if ($Count > 1)
    00184                     {
    00185                         $Query = "SELECT ResourceId FROM Resources"
    00186                                 ." ORDER BY ".$Field->DBFieldName()
    00187                                 .($Ascending ? " ASC" : " DESC");
    00188                     }
    00189                     break;
    00190
    00191                 case MetadataSchema::MDFTYPE_NUMBER:
    00192                 case MetadataSchema::MDFTYPE_TIMESTAMP:
    00193                     $Count = $this->DB->Query("SELECT COUNT(*) AS ResourceCount"
    00194                             ." FROM Resources WHERE "
    00195                             .$Field->DBFieldName()." IS NOT NULL",
    00196                             "ResourceCount");
    00197                     if ($Count > 1)
    00198                     {
    00199                         $Query = "SELECT ResourceId FROM Resources"
    00200                                 ." ORDER BY ".$Field->DBFieldName()
    00201                                 .($Ascending ? " ASC" : " DESC");
    00202                     }
    00203                     break;
    00204
    00205                 case MetadataSchema::MDFTYPE_DATE:
    00206                     $Count = $this->DB->Query("SELECT COUNT(*) AS ResourceCount"
    00207                             ." FROM Resources WHERE "
    00208                             .$Field->DBFieldName()."Begin IS NOT NULL",
    00209                             "ResourceCount");
    00210                     if ($Count > 1)
    00211                     {
    00212                         $Query = "SELECT ResourceId FROM Resources"
    00213                                 ." ORDER BY ".$Field->DBFieldName()."Begin"
    00214                                 .($Ascending ? " ASC" : " DESC");
    00215                     }
    00216                     break;
    00217             }
    00218
    00219             # if appropriate query was found
    00220             if (isset($Query))
    00221             {
    00222                 # if limited number of results were requested
    00223                 if ($Limit !== NULL)
    00224                 {
    00225                     # add limit to query
    00226                     $Query .= " LIMIT ".intval($Limit);
    00227                 }
    00228
    00229                 # perform query and retrieve resource IDs
    00230                 $this->DB->Query($Query);
    00231                 $ResourceIds = $this->DB->FetchColumn("ResourceId");
    00232             }
    00233         }
    00234
    00235         # return resource IDs to caller
    00236         return $ResourceIds;
    00237     }
    00238
    00239     # get date/time of last resource modification (returned as Unix timestamp)
    00240     function GetTimestampOfLastResourceModification($OnlyReleasedResources = TRUE)
    00241     {
    00242         $LastChangeDate = $this->DB->Query(
    00243                 "SELECT MAX(DateLastModified) AS LastChangeDate"
    00244                 ." FROM Resources".($OnlyReleasedResources ? " WHERE ReleaseFlag = 1" : ""),
    00245                 "LastChangeDate");
    00246         return ($LastChangeDate ? strtotime($LastChangeDate) : NULL);
    00247     }
    00248
    00249     # get list of possible field names for resources
    00250     function GetPossibleFieldNames()
    00251     {
    00252         # retrieve field names from schema
    00253         $FieldNames = array();
    00254         $Schema = new MetadataSchema();
    00255         $Fields = $Schema->GetFields();
    00256         foreach ($Fields as $Field)
    00257         {
    00258             $FieldNames[$Field->Id()] = $Field->Name();
    00259         }
    00260
    00261         # return field names to caller
    00262         return $FieldNames;
    00263     }
    00264
    00265     # find resources with values that match those specified
    00266     # (index of $ValuesToMatch is field IDs)
    00267     function GetMatchingResources($ValuesToMatch)
    00268     {
    00269         # start out assuming we won't find any resources
    00270         $Resources = array();
    00271
    00272         # for each value
    00273         $Schema = new MetadataSchema();
    00274         $Fields = $Schema->GetFields(
    00275                 MetadataSchema::MDFTYPE_TEXT |
    00276                 MetadataSchema::MDFTYPE_PARAGRAPH |
    00277                 MetadataSchema::MDFTYPE_NUMBER | MetadataSchema::MDFTYPE_DATE |
    00278                 MetadataSchema::MDFTYPE_TIMESTAMP |
    00279                 MetadataSchema::MDFTYPE_FLAG | MetadataSchema::MDFTYPE_URL |
    00280                 MetadataSchema::MDFTYPE_POINT);
    00281         $LinkingTerm = "";
    00282         $Condition = "";
    00283         foreach ($ValuesToMatch as $FieldId => $Value)
    00284         {
    00285             # if field can be used for comparison
    00286             if (isset($Fields[$FieldId]))
    00287             {
    00288                 # add comparison to condition
    00289                 $Condition .= $LinkingTerm.$Fields[$FieldId]->DBFieldName()
    00290                         ." = '".addslashes($Value)."'";
    00291                 $LinkingTerm = " AND ";
    00292             }
    00293         }
    00294
    00295         # if there were valid conditions
    00296         if (strlen($Condition))
    00297         {
    00298             # build query statment
    00299             $Query = "SELECT ResourceId FROM Resources WHERE ".$Condition;
    00300
    00301             # execute query to retrieve matching resource IDs
    00302             $this->DB->Query($Query);
    00303             $ResourceIds = $DB->FetchColumn("ResourceId");
    00304
    00305             # retrieve resource objects
    00306             foreach ($ResourceIds as $Id)
    00307             {
    00308                 $Resources[$Id] = new Resource($Id);
    00309             }
    00310         }
    00311
    00312         # return any resources found to caller
    00313         return $Resources;
    00314     }
    00315
    00316
    00317     # ---- PRIVATE INTERFACE -------------------------------------------------
    00318
    00319 }
    00320
    00321
    00322 ?>

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