package org.paneris.bibliomania;

 import java.util.Hashtable;

 import java.util.Locale;

 import org.melati.poem.Database;

 import org.melati.poem.DefinitionSource;

 import org.melati.poem.PoemException;

 import org.melati.poem.PoemThread;

 import org.paneris.bibliomania.generated.CurrencyTableBase;

 public class CurrencyTable<T extends Currency> extends CurrencyTableBase<Currency> {

   public CurrencyTable(

     Database database,

     String name,

     DefinitionSource definitionSource)

     throws PoemException {

     super(database, name, definitionSource);

   }

   public Currency ensure(String name, double conversionrate, Locale locale) {

     Currency c = (Currency)newPersistent();

     c.setName(name);

     c.setConversionrate(conversionrate);

     c.setLocale(locale.toString());

     return (Currency)getNameColumn().ensure(c);

   }

   public Currency getCurrency(Locale locale) {

     return getCurrency(locale.toString());

   }

   private Hashtable cache = null;

   private long cacheSerial = 0L;

   private static final Object nullEntry = new Object();

   public Currency getCurrency(String name) {

     if (cache == null || cacheSerial != serial(PoemThread.transaction()))

       cache = new Hashtable();

     Object value = cache.get(name);

     if (value == nullEntry)

       return null;

     else if (value != null)

       return (Currency)value;

     else {

       Currency prop = (Currency)getLocaleColumn().firstWhereEq(name);

       cache.put(name, prop == null ? nullEntry : prop);

       return prop;

     }

   }

 }