Coverage report

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ca.spaz.cron.database.NutrientTable
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 1   
 /*
 2   
  * Created on Apr 16, 2005 by davidson
 3   
  */
 4   
 package ca.spaz.cron.database;
 5   
 
 6   
 import java.lang.reflect.Field;
 7   
 
 8   
 import org.apache.log4j.Logger;
 9   
 
 10   
 import ca.spaz.cron.datasource.ILocalFoodDatasource;
 11   
 
 12   
 /**
 13   
  * A base class for a group of related nutrient values Provides common support
 14   
  * for loading and updating the database.
 15   
  *
 16   
  * The nutrient table is expected to have field names that match the names and
 17   
  * types of the corresponding database table. This greatly simplifies
 18   
  * maintaining the database and generating UI forms through reflection.
 19   
  *
 20   
  * @author davidson
 21   
  */
 22  0 
 public abstract class NutrientTable {
 23   
     /**
 24   
      * Logger for this class
 25   
      */
 26  0 
     private static final Logger logger = Logger.getLogger(NutrientTable.class);
 27   
     private Food food;
 28   
 
 29  0 
     public NutrientTable() {
 30  0 
     }
 31   
 
 32  0 
     public NutrientTable(Food f) {
 33  0 
         this.food = f;
 34  0 
         f.getDataSource().getNutrientsFor(f, this);
 35  0 
     }
 36  0 
 
 37   
     /**
 38   
      * Get the name of the table corresponding to this class. By default it uses
 39   
      * the class name. Override this method if it is different.
 40   
      *
 41  0 
      * @return the name of the database table for this object
 42  0 
      */
 43   
     public String getTableName() {
 44  0 
         return doGetTableName();
 45  0 
     }
 46  0 
 
 47   
     /**
 48  0 
      * Subclasses must implement this in order to supply their table name.
 49   
      *
 50  0 
      * @return the table name to perform lookups on.
 51  0 
      */
 52   
     protected abstract String doGetTableName();
 53   
 
 54  0 
     /**
 55   
      * Add the nutrients in the given table to our total
 56  0 
      *
 57   
      * @param toAdd
 58  0 
      *            the nutrients ratios to add
 59  0 
      * @param weight
 60  0 
      *            multiplier for the amount in the added nutrients
 61   
      */
 62  0 
     public void addFood(NutrientTable toAdd, double weight) {
 63  0 
         assert (toAdd.getClass() == this.getClass());
 64  0 
         Field[] fields = this.getClass().getFields();
 65  0 
         for (int i = 0; i < fields.length; i++) {
 66   
             try {
 67  0 
                 double d1 = fields[i].getDouble(this);
 68  0 
                 double d2 = fields[i].getDouble(toAdd);
 69  0 
                 fields[i].setDouble(this, d1 + d2 * weight);
 70  0 
             } catch (Exception e) {
 71  0 
                 logger.error("addFood(NutrientTable, double)", e);
 72  0 
             }
 73   
         }
 74  0 
     }
 75   
 
 76   
     /**
 77   
      * Get the amount of a nutrient by the tag name
 78   
      *
 79   
      * @param tag
 80   
      *            the tag name of the nutrient
 81   
      * @return the amount of the nutrient, or 0 if none found
 82   
      */
 83   
     public double getAmountByTag(String tag) {
 84  0 
         double val = 0;
 85   
         try {
 86  0 
             Field f = this.getClass().getField(tag);
 87  0 
             val = f.getDouble(this);
 88  0 
         } catch (Exception e) {
 89  0 
             logger.error("getAmountByTag(String)", e);
 90  0 
         }
 91  0 
         return val;
 92   
     }
 93   
 
 94   
     /**
 95   
      * Set the amount of a nutrient by the tag name
 96   
      *
 97   
      * @param tag the tag name of the nutrient
 98   
      * @param val the amount of the nutrient, or 0 if none found
 99   
      */
 100   
     public void setAmountByTag(String tag, double val) {
 101   
         try {
 102  0 
             Field f = this.getClass().getField(tag);
 103  0 
             f.setDouble(this, val);
 104  0 
         } catch (Exception e) {
 105  0 
             logger.error("setAmountByTag(String, double)", e);
 106  0 
         }
 107  0 
     }
 108   
 
 109   
     /**
 110   
      * Update the existing food information
 111   
      */
 112   
     public void updateDatabase() {
 113  0 
         ILocalFoodDatasource lds = (ILocalFoodDatasource) food.getDataSource();
 114  0 
         lds.saveFood(food);
 115  0 
     }
 116   
 
 117   
 }

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