Sort wrapper list in Apex based on Levels

Question

I have created a wrapper which contains an account record and a string describing the level of account Platinum, Gold, Silver.

public class PartnerWrapper implements Comparable {
    public Account acc;
    public String level;
}

So how can I sort this wrapper list (using compareTo method as I have implemented my class with Comparable interface) first displaying results for Platinum, then Gold and then Silver?

If this cannot be achieved using Comparable interface, then please provide sample code snippet.

Answer 1

public class PartnerWrapper implements Comparable {
    private static final Map<String, Integer> levelsOrder = new Map<String, Integer>{
        'Platinum' => 1,
        'Gold' => 2,
        'Silver' => 3
        };
    public Account acc {get; set;}
    public String level {get; set;}

    public Integer compareTo(Object thatObj){
        PartnerWrapper that = (PartnerWrapper) thatObj;
        Integer thisOrder = defineLevelOrder(this.level);
        Integer thatOrder = defineLevelOrder(that.level);
        return thisOrder - thatOrder;
    }

    private Integer defineLevelOrder(String currentlevel){
        Integer result = 2147483647;
        if(levelsOrder.containsKey(currentlevel)){
            result = levelsOrder.get(currentlevel);
        }
        return result;
    }
}

You can control order by additional wrapper static field, that stores level and its order.

private static final Map<String, Integer> levelsOrder = new Map<String, Integer>{
    'Platinum' => 1,
    'Gold' => 2,
    'Silver' => 3
    };

Do not give field public access modifiers without properties, so I added properties as well.

If level is not in order defining field, than order of it is a max Integer apex value 2147483647. So unknown level values would be last after sorting