When I try to create the Apex Class for this filter using this post, I get the following error when I try to save the Class:

Compile Error: unexpected token: 'global class OppTerrAssignDefaultLogicFilter implements' at line 11 column 0

I used the Apex Code example found at this link:
In case it is not obvious, I am not a devloper, so any suggestions would be appreciated.

Here is the sample code I used:

001/*** Apex version of the default logic.
002* If opportunity's assigned account is assigned to
003*  Case 1: 0 territories in active model
004*            then set territory2Id =   null
005*  Case 2: 1 territory in active model
006*            then set territory2Id =   account's territory2Id
007*  Case 3: 2 or more territories in active model
008*            then set territory2Id =   account's territory2Id that is of highest priority.
009*            But if multiple   territories have same highest priority, then set territory2Id = null
010*/
011global class OppTerrAssignDefaultLogicFilter implements
012TerritoryMgmt.OpportunityTerritory2AssignmentFilter {
013     /**
014     * No-arg constructor.
015     */
016     global   OppTerrAssignDefaultLogicFilter() {}
017 
018     /**
019      * Get mapping of   opportunity to territory2Id. The incoming list of opportunityIds contains only those with IsExcludedFromTerritory2Filter=false.
020      * If territory2Id =   null in result map, clear the opportunity.territory2Id if set.
021      * If opportunity is not present in result map, its territory2Id remains intact.
022      */
023    global Map<Id,Id> getOpportunityTerritory2Assignments(List<Id> opportunityIds) {
024        Map<Id,   Id> OppIdTerritoryIdResult = new Map<Id, Id>();
025 
026        //Get the active territory model Id
027        Id   activeModelId = getActiveModelId();
028 
029        if(activeModelId   != null){
030            List<Opportunity>   opportunities =
031              [Select Id, AccountId, Territory2Id from Opportunity where Id   IN
032              :opportunityIds];
033            Set<Id>   accountIds = new Set<Id>();
034            //Create   set of parent accountIds
035            for(Opportunity opp:opportunities){
036                if(opp.AccountId   != null){
037                    accountIds.add(opp.AccountId);
038                    }
039                }
040 
041                Map<Id,Territory2Priority> accountMaxPriorityTerritory =
042getAccountMaxPriorityTerritory(activeModelId, accountIds);
043 
044            //for each opportunity, assign the highest priority territory if there is
045no conflict, else assign null
046            for(Opportunity opp: opportunities){
047               Territory2Priority tp = accountMaxPriorityTerritory.get(opp.AccountId);
048               //assign highest priority
049              territory if there is only 1
050              if((tp   != null) && (tp.moreTerritoriesAtPriority == false) &&
051(tp.territory2Id != opp.Territory2Id)){
052                   OppIdTerritoryIdResult.put(opp.Id, tp.territory2Id);
053               }else{
054                   OppIdTerritoryIdResult.put(opp.Id,   null);
055               }
056            }
057        }
058        return   OppIdTerritoryIdResult;
059    }
060     
061    /**
062      * Query assigned territoryIds in active model for given accountIds
063      * Create a map of accountId to max priority territory
064      */
065     private Map<Id,Territory2Priority> getAccountMaxPriorityTerritory(Id
066activeModelId, Set<Id> accountIds){
067        Map<Id,Territory2Priority> accountMaxPriorityTerritory = new
068Map<Id,Territory2Priority>();
069        for(ObjectTerritory2Association ota:[Select ObjectId, Territory2Id,
070Territory2.Territory2Type.Priority from ObjectTerritory2Association where objectId IN
071:accountIds and Territory2.Territory2ModelId = :activeModelId]){
072            Territory2Priority tp = accountMaxPriorityTerritory.get(ota.ObjectId);
073 
074            if((tp   == null) || (ota.Territory2.Territory2Type.Priority >
075tp.priority)){
076                //If this is the first territory examined for account or it has
077greater priority than current highest priority territory, then set this as new highest
078priority territory.
079                tp = new
080Territory2Priority(ota.Territory2Id,ota.Territory2.Territory2Type.priority,false);
081            }else if(ota.Territory2.Territory2Type.priority == tp.priority){
082                //The priority of current highest territory is same as this, so set  
083moreTerritoriesAtPriority to indicate multiple highest priority territories seen so far.
084                tp.moreTerritoriesAtPriority = true;
085            }
086             
087            accountMaxPriorityTerritory.put(ota.ObjectId,   tp);
088        }
089        return accountMaxPriorityTerritory;
090    }
091 
092              
093    /**
094     * Get the Id of the Active Territory Model.
095     * If none exists, return   null;
096     */
097   private Id getActiveModelId() {
098       List<Territory2Model>   models = [Select Id from Territory2Model where State ='Active'];
099       Id activeModelId = null;
100       if(models.size()   == 1){
101           activeModelId = models.get(0).Id;
102       }
103        
104       return activeModelId;
105   }
106    
107   /**
108    * Helper class to help   capture territory2Id, its priority, and whether there are more territories with same priority assigned to the
109 account
110    */
111   private class Territory2Priority {
112       public Id territory2Id { get; set; }
113       public Integer priority { get; set; }
114       public   Boolean moreTerritoriesAtPriority { get; set; }
115        
116              Territory2Priority(Id territory2Id, Integer priority, Boolean moreTerritoriesAtPriority){
117           this.territory2Id = territory2Id;
118           this.priority = priority;
119           this.moreTerritoriesAtPriority = moreTerritoriesAtPriority;
120       }
121   }
122}}

When I try to create the Apex Class for this filter using this post, I get the following error when I try to save the Class:

Compile Error: unexpected token: 'global class OppTerrAssignDefaultLogicFilter implements' at line 11 column 0

I used the Apex Code example found at this link:
In case it is not obvious, I am not a devloper, so any suggestions would be appreciated.

Here is the sample code I used:

001/*** Apex version of the default logic.
002* If opportunity's assigned account is assigned to
003*  Case 1: 0 territories in active model
004*            then set territory2Id =   null
005*  Case 2: 1 territory in active model
006*            then set territory2Id =   account's territory2Id
007*  Case 3: 2 or more territories in active model
008*            then set territory2Id =   account's territory2Id that is of highest priority.
009*            But if multiple   territories have same highest priority, then set territory2Id = null
010*/
011global class OppTerrAssignDefaultLogicFilter implements
012TerritoryMgmt.OpportunityTerritory2AssignmentFilter {
013     /**
014     * No-arg constructor.
015     */
016     global   OppTerrAssignDefaultLogicFilter() {}
017 
018     /**
019      * Get mapping of   opportunity to territory2Id. The incoming list of opportunityIds contains only those with IsExcludedFromTerritory2Filter=false.
020      * If territory2Id =   null in result map, clear the opportunity.territory2Id if set.
021      * If opportunity is not present in result map, its territory2Id remains intact.
022      */
023    global Map<Id,Id> getOpportunityTerritory2Assignments(List<Id> opportunityIds) {
024        Map<Id,   Id> OppIdTerritoryIdResult = new Map<Id, Id>();
025 
026        //Get the active territory model Id
027        Id   activeModelId = getActiveModelId();
028 
029        if(activeModelId   != null){
030            List<Opportunity>   opportunities =
031              [Select Id, AccountId, Territory2Id from Opportunity where Id   IN
032              :opportunityIds];
033            Set<Id>   accountIds = new Set<Id>();
034            //Create   set of parent accountIds
035            for(Opportunity opp:opportunities){
036                if(opp.AccountId   != null){
037                    accountIds.add(opp.AccountId);
038                    }
039                }
040 
041                Map<Id,Territory2Priority> accountMaxPriorityTerritory =
042getAccountMaxPriorityTerritory(activeModelId, accountIds);
043 
044            //for each opportunity, assign the highest priority territory if there is
045no conflict, else assign null
046            for(Opportunity opp: opportunities){
047               Territory2Priority tp = accountMaxPriorityTerritory.get(opp.AccountId);
048               //assign highest priority
049              territory if there is only 1
050              if((tp   != null) && (tp.moreTerritoriesAtPriority == false) &&
051(tp.territory2Id != opp.Territory2Id)){
052                   OppIdTerritoryIdResult.put(opp.Id, tp.territory2Id);
053               }else{
054                   OppIdTerritoryIdResult.put(opp.Id,   null);
055               }
056            }
057        }
058        return   OppIdTerritoryIdResult;
059    }
060     
061    /**
062      * Query assigned territoryIds in active model for given accountIds
063      * Create a map of accountId to max priority territory
064      */
065     private Map<Id,Territory2Priority> getAccountMaxPriorityTerritory(Id
066activeModelId, Set<Id> accountIds){
067        Map<Id,Territory2Priority> accountMaxPriorityTerritory = new
068Map<Id,Territory2Priority>();
069        for(ObjectTerritory2Association ota:[Select ObjectId, Territory2Id,
070Territory2.Territory2Type.Priority from ObjectTerritory2Association where objectId IN
071:accountIds and Territory2.Territory2ModelId = :activeModelId]){
072            Territory2Priority tp = accountMaxPriorityTerritory.get(ota.ObjectId);
073 
074            if((tp   == null) || (ota.Territory2.Territory2Type.Priority >
075tp.priority)){
076                //If this is the first territory examined for account or it has
077greater priority than current highest priority territory, then set this as new highest
078priority territory.
079                tp = new
080Territory2Priority(ota.Territory2Id,ota.Territory2.Territory2Type.priority,false);
081            }else if(ota.Territory2.Territory2Type.priority == tp.priority){
082                //The priority of current highest territory is same as this, so set  
083moreTerritoriesAtPriority to indicate multiple highest priority territories seen so far.
084                tp.moreTerritoriesAtPriority = true;
085            }
086             
087            accountMaxPriorityTerritory.put(ota.ObjectId,   tp);
088        }
089        return accountMaxPriorityTerritory;
090    }
091 
092              
093    /**
094     * Get the Id of the Active Territory Model.
095     * If none exists, return   null;
096     */
097   private Id getActiveModelId() {
098       List<Territory2Model>   models = [Select Id from Territory2Model where State ='Active'];
099       Id activeModelId = null;
100       if(models.size()   == 1){
101           activeModelId = models.get(0).Id;
102       }
103        
104       return activeModelId;
105   }
106    
107   /**
108    * Helper class to help   capture territory2Id, its priority, and whether there are more territories with same priority assigned to the
109 account
110    */
111   private class Territory2Priority {
112       public Id territory2Id { get; set; }
113       public Integer priority { get; set; }
114       public   Boolean moreTerritoriesAtPriority { get; set; }
115        
116              Territory2Priority(Id territory2Id, Integer priority, Boolean moreTerritoriesAtPriority){
117           this.territory2Id = territory2Id;
118           this.priority = priority;
119           this.moreTerritoriesAtPriority = moreTerritoriesAtPriority;
120       }
121   }
122}}

Hi, I'm trying to Enable Filter-Based Opportunity Territory Assignment for Enterprise Territory Management.Part of the setup is:
'If your organization is using the Apex code Salesforce provides, first create the class and then return to this Settings page and enter the class name: OppTerrAssignDefaultLogicFilter. If you opt to use your own code for the Apex class, you’ll come back and enter the name of the class that you create.

However I can't find any other information related to the 'OppTerrAssignDefaultLogicFilter' class anywhere. Has anyone come across this apex class and if so can they share it?