package org.kuali.student.common.ui.server.screenreport.jasper;
   
   import java.text.DateFormat;
   import java.text.SimpleDateFormat;
   import java.util.Date;
   import java.util.Iterator;
   import java.util.NoSuchElementException;
   
   import net.sf.jasperreports.engine.JRDataSource;
  import net.sf.jasperreports.engine.JRException;
  import net.sf.jasperreports.engine.JRField;
  
  import org.kuali.student.common.assembly.data.Data;
  import org.kuali.student.common.assembly.data.Data.Property;
  
  /**
   * This is a custom data source class to convert a datamodel to a Jasper report data source object.
   * 
   * @author Kuali Rice Team (kuali-rice@googlegroups.com)
   */
  public class KSCustomDataSource implements JRDataSource {
  
      private Iterator<Property> iterator;
  
      private Property property;
  
      private DateFormat format;
  
      /**
  	 *
  	 */
      public KSCustomDataSource(final Iterator<Property> source) {
          this.iterator = source;
          this.format = new SimpleDateFormat("yyyy-MM-dd");
      }
  
      /**
  	 *
  	 */
      public boolean next() throws JRException {
          try {
              property = (Property) iterator.next();
              if (("metaInfo".equals(property.getKey().toString())) || ("id".equals(property.getKey().toString())) || ("_runtimeData".equals(property.getKey().toString()))) {
                  return this.next();
              }
          } catch (NoSuchElementException e) {
              return false;
          }
          return true;
      }
  
      /**
  	 *
  	 */
      public Object getFieldValue(JRField field) throws JRException {
          Object value = null;
  
          String fieldName = field.getName();
          if ("key".equals(fieldName)) {
              value = property.getKey().toString();
          } else {
              if (property.getValueType().equals(Data.class)) {
                  if ("sub".equals(fieldName)) {
                      value = new Boolean(true);
                  } else if ("value".equals(fieldName)) {
                      value = null;
                  } else if ("subset".equals(fieldName)) {
                      value = new KSCustomDataSource(((Data) property.getValue()).iterator());
                  }
              } else {
                  if ("sub".equals(fieldName)) {
                      value = new Boolean(false);
                  } else if ("value".equals(fieldName)) {
                      if (property.getValue() instanceof Date) {
                          value = format.format((Date) property.getValue());
                      } else {
                          if (property.getValue() != null) {
                              value = property.getValue().toString();
                          }
                      }
                  } else if ("subset".equals(fieldName)) {
                      value = null;
                  }
              }
          }
          return value;
      }
  
  }