dev 契约锁

P15GEN2\59518

2024-05-29 d4210c7c4b04abde20037ea8aa0f54ef8a2649aa

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package foundation.geography;
 
import foundation.dao.preload.Bucket;
import foundation.json.IJSONProvider;
import foundation.json.IJSONWriter;
 
public class CityBucket extends Bucket<City> implements IJSONProvider {
 
    
    private static CityBucket instance;
    
    
    public static CityBucket getInstance() {
        return instance;
    }
    
    public static CityBucket newInstance() {
        return new CityBucket();
    }
    
    public void activate() {
        instance = this;
    }
 
    @Override
    public void writeJSON(IJSONWriter writer) {
        writer.beginArray("citys");
        
        for (City city: items) {
            writer.beginObject();
            city.writeJSONBody(writer);
            writer.endObject();
        }
        
        writer.endArray();
    }
 
}