How to use

getField

method

in

net.sf.dynamicreports.report.builder.FieldBuilder

/**
 * <p>Constructor for PercentageSubtotalBuilder.</p>
 *
 * @param field        a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 * @param showInColumn a {@link net.sf.dynamicreports.report.builder.column.ColumnBuilder} object.
 */
protected PercentageSubtotalBuilder(FieldBuilder<? extends Number> field, ColumnBuilder<?, ?> showInColumn) {
  this(field.getField(), showInColumn);
}

/**
 * <p>Constructor for PercentageColumnBuilder.</p>
 *
 * @param field a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 */
protected PercentageColumnBuilder(FieldBuilder<? extends Number> field) {
  Validate.notNull(field, "field must not be null");
  this.actualExpression = field.getField();
}

/**
 * <p>addExpression.</p>
 *
 * @param field a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 */
protected void addExpression(FieldBuilder<?> field) {
  Validate.notNull(field, "field must not be null");
  this.expressions.add(field.getField());
}

/**
 * <p>Constructor for VariableBuilder.</p>
 *
 * @param field       a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 * @param calculation a {@link net.sf.dynamicreports.report.constant.Calculation} object.
 */
protected VariableBuilder(FieldBuilder<?> field, Calculation calculation) {
  super(new DRVariable<T>(field.getField(), calculation));
}

/**
 * <p>Constructor for VariableBuilder.</p>
 *
 * @param name        a {@link java.lang.String} object.
 * @param field       a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 * @param calculation a {@link net.sf.dynamicreports.report.constant.Calculation} object.
 */
protected VariableBuilder(String name, FieldBuilder<?> field, Calculation calculation) {
  super(new DRVariable<T>(name, field.getField(), calculation));
}

  /**
   * {@inheritDoc}
   */
  @Override
  public String getName() {
    return getField().getName();
  }
}

/**
 * <p>Constructor for TextColumnBuilder.</p>
 *
 * @param field a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 */
protected TextColumnBuilder(FieldBuilder<T> field) {
  Validate.notNull(field, "field must not be null");
  setValueExpression(field.getField());
}

/**
 * <p>Constructor for CrosstabVariableBuilder.</p>
 *
 * @param field       a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 * @param calculation a {@link net.sf.dynamicreports.report.constant.Calculation} object.
 */
protected CrosstabVariableBuilder(FieldBuilder<?> field, Calculation calculation) {
  super(new DRCrosstabVariable<T>(field.getField(), calculation));
}

/**
 * <p>setValue.</p>
 *
 * @param field a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 * @return a {@link net.sf.dynamicreports.report.builder.component.BooleanFieldBuilder} object.
 */
public BooleanFieldBuilder setValue(FieldBuilder<Boolean> field) {
  Validate.notNull(field, "field must not be null");
  getObject().setValueExpression(field.getField());
  return this;
}

/**
 * Creates a new column.<br/> It is used to show values from the data source.
 *
 * @param field the field definition
 * @param <T>   a T object.
 * @return a column builder
 */
public static <T> TextColumnBuilder<T> column(FieldBuilder<T> field) {
  TextColumnBuilder<T> textColumnBuilder = new TextColumnBuilder<T>(field);
  if (field.getField().getDataType() != null) {
    textColumnBuilder.setDataType(field.getField().getDataType());
  }
  return textColumnBuilder;
}

/**
 * <p>Constructor for AbstractCrosstabGroupBuilder.</p>
 *
 * @param field         a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 * @param crosstabGroup a U object.
 */
protected AbstractCrosstabGroupBuilder(FieldBuilder<V> field, U crosstabGroup) {
  super(crosstabGroup);
  Validate.notNull(field, "field must not be null");
  getObject().setExpression(field.getField());
  getObject().setDataType(field.getField().getDataType());
}

/**
 * <p>setText.</p>
 *
 * @param field a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 * @return a {@link net.sf.dynamicreports.report.builder.component.TextFieldBuilder} object.
 */
public TextFieldBuilder<T> setText(FieldBuilder<T> field) {
  Validate.notNull(field, "field must not be null");
  getObject().setValueExpression(field.getField());
  if (getObject().getDataType() == null) {
    getObject().setDataType(field.getField().getDataType());
  }
  return this;
}

/**
 * <p>Constructor for BooleanColumnBuilder.</p>
 *
 * @param field a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 */
protected BooleanColumnBuilder(FieldBuilder<Boolean> field) {
  super(new DRBooleanColumn(new DRBooleanField()));
  Validate.notNull(field, "field must not be null");
  getComponent().setValueExpression(field.getField());
}

/**
 * <p>Constructor for CrosstabMeasureBuilder.</p>
 *
 * @param field       a {@link net.sf.dynamicreports.report.builder.FieldBuilder} object.
 * @param calculation a {@link net.sf.dynamicreports.report.constant.Calculation} object.
 */
protected CrosstabMeasureBuilder(FieldBuilder<?> field, Calculation calculation) {
  super(new DRCrosstabMeasure<T>(Crosstabs.variable(field, calculation).build()));
  if (calculation.equals(Calculation.COUNT) || calculation.equals(Calculation.DISTINCT_COUNT)) {
    setDataType(DataTypes.longType());
  } else if (calculation.equals(Calculation.AVERAGE) || calculation.equals(Calculation.STANDARD_DEVIATION) || calculation.equals(Calculation.VARIANCE)) {
    setDataType(DataTypes.doubleType());
  } else {
    setDataType(field.getField().getDataType());
  }
}