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  package org.apache.cayenne.access.translator.batch;
  
  import org.apache.cayenne.access.sqlbuilder.DeleteBuilder;
  import org.apache.cayenne.access.sqlbuilder.SQLBuilder;
  import org.apache.cayenne.access.translator.DbAttributeBinding;
  import org.apache.cayenne.access.types.ExtendedType;
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.map.DbAttribute;
  import org.apache.cayenne.query.BatchQueryRow;
  import org.apache.cayenne.query.DeleteBatchQuery;
  
  /**
   * @since 4.2
   */
  public class DeleteBatchTranslator extends BaseBatchTranslator<DeleteBatchQuery> implements BatchTranslator {
  
      public DeleteBatchTranslator(DeleteBatchQuery query, DbAdapter adapter) {
          super(query, adapter);
      }
  
      @Override
      public String getSql() {
          DeleteBuilder deleteBuilder = SQLBuilder
                  .delete(context.getRootDbEntity())
                  .where(buildQualifier(context.getQuery().getDbAttributes()));
          return doTranslate(deleteBuilder);
      }
  
      @Override
      protected boolean isNullAttribute(DbAttribute attribute) {
          return context.getQuery().isNull(attribute);
      }
  
      @Override
      public DbAttributeBinding[] updateBindings(BatchQueryRow row) {
          DeleteBatchQuery deleteBatch = context.getQuery();
          for(int i=0, position=0; i<deleteBatch.getDbAttributes().size(); i++) {
              position = updateBinding(row.getValue(i), position);
          }
          return bindings;
      }
  
      protected int updateBinding(Object value, int position) {
          // skip null attributes... they are translated as "IS NULL"
          if(value != null) {
              ExtendedType<?> extendedType = context.getAdapter().getExtendedTypes().getRegisteredType(value.getClass());
              bindings[position].include(++position, value, extendedType);
          }
          return position;
      }
  }
  