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  package org.apache.cayenne.access.jdbc.reader;
  
  import java.sql.ResultSet;
  import java.util.Collection;
  import java.util.Map;
  
  import org.apache.cayenne.DataRow;
  import org.apache.cayenne.access.types.ExtendedType;
  import org.apache.cayenne.map.EntityInheritanceTree;
  import org.apache.cayenne.map.ObjEntity;
  import org.apache.cayenne.reflect.ClassDescriptor;
  
  /**
   * Deals with DataRow type conversion in inheritance situations.
   * 
   * @since 1.2
   */
  class DataRowPostProcessor {
  
      private EntityInheritanceTree inheritanceTree;
      private Map<String, Collection<ColumnOverride>> columnOverrides;
      private Collection<ColumnOverride> defaultOverrides;
  
      DataRowPostProcessor(ClassDescriptor classDescriptor, Map<String, Collection<ColumnOverride>> columnOverrides) {
  
          if (classDescriptor != null && classDescriptor.hasSubclasses()) {
              this.inheritanceTree = classDescriptor.getEntityInheritanceTree();
              this.columnOverrides = columnOverrides;
          } else {
              if (columnOverrides.size() != 1) {
                  throw new IllegalArgumentException("No inheritance - there must be only one override set");
              }
  
              defaultOverrides = columnOverrides.values().iterator().next();
          }
      }
  
      void postprocessRow(ResultSet resultSet, DataRow row) throws Exception {
  
          Collection<ColumnOverride> overrides = getOverrides(row);
  
          if (overrides != null) {
              for (final ColumnOverride override : overrides) {
  
                  Object newValue = override.converter.materializeObject(resultSet, override.index, override.jdbcType);
                  row.put(override.key, newValue);
              }
          }
      }
  
      private final Collection<ColumnOverride> getOverrides(DataRow row) {
          if (defaultOverrides != null) {
              return defaultOverrides;
          } else {
              ObjEntity entity = inheritanceTree.entityMatchingRow(row);
              return entity != null ? columnOverrides.get(entity.getName()) : null;
          }
      }
  
      static final class ColumnOverride {
  
          int index;
          int jdbcType;
          String key;
          ExtendedType converter;
  
          ColumnOverride(int index, String key, ExtendedType converter, int jdbcType) {
              this.index = index;
              this.key = key;
              this.converter = converter;
              this.jdbcType = jdbcType;
          }
      }
  }
  