dev 契约锁

P15GEN2\59518

2024-05-29 d4210c7c4b04abde20037ea8aa0f54ef8a2649aa

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package foundation.variant.provider;
 
import java.util.Calendar;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
 
public class GlobalVariantProvider implements IVariantsProvider {
    
    public static String ProviderName = "globalVariant";
    public static Set<String> VariantNames;
    private static GlobalVariantProvider instance;
 
    
    static {
        VariantNames = new HashSet<String>();
        initVariantNames();
    }
    
    private GlobalVariantProvider() {
        
    }
    
    public static GlobalVariantProvider getInstance() {
        if (instance == null) {
            instance = new GlobalVariantProvider();
        }
        
        return instance;
    }
    
    @Override
    public String getProviderName() {
        return ProviderName;
    }
 
    @Override
    public VariantProviderType getProviderType() {
        return VariantProviderType.Persist;
    }
 
    @Override
    public Set<String> getVariantNames() {
        return VariantNames;
    }
 
    @Override
    public boolean containsVariant(String name) {
        if (name == null) {
            return false;
        }
        
        name = name.toLowerCase();
        return VariantNames.contains(name);
    }
 
    @Override
    public Object getVariantValue(DataEvent dataEvent, String name) {
        if ("newdate".equals(name)) {
            return new Date();
        }
        else if ("newdatetime".equals(name)) {
            return new Date();
        }
        else if ("current.year".equals(name)) {
            Calendar calendar = Calendar.getInstance();
            return String.valueOf(calendar.get(Calendar.YEAR));
        }
        else if ("current.month".equals(name)) {
            Calendar calendar = Calendar.getInstance();
            return String.valueOf(calendar.get(Calendar.MONTH) + 1);
        }
        
        return null;
    }
    
    public static void initVariantNames() {
        addOneVariantName("newDate");
        addOneVariantName("newDateTime");
        addOneVariantName("current.year");
        addOneVariantName("current.month");
    }
    
    public static void addOneVariantName(String name) {
        VariantNames.add(name.toLowerCase());
    }
}