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## org.eclipse.birt.data.engine.api.querydefn
Class GroupDefinition

    java.lang.Object
      org.eclipse.birt.data.engine.api.querydefn.BaseTransform
          org.eclipse.birt.data.engine.api.querydefn.GroupDefinition

All Implemented Interfaces:
  IBaseTransform, IGroupDefinition

    public class GroupDefinition

extends BaseTransform
implements IGroupDefinition

Default implementation of `IGroupDefinition`.

Field Summary
`protected int` | `interval`
`protected double` | `intervalRange`
`protected java.lang.Object` | `intervalStart`
`protected java.lang.String` | `keyColumn`
`protected java.lang.String` | `keyExpr`
`protected java.lang.String` | `name`
`protected int` | `sortDirection`

Fields inherited from class org.eclipse.birt.data.engine.api.querydefn.BaseTransform
`AFTER_LAST_ROW, afterExpressions, BEFORE_FIRST_ROW, beforeExpressions, filters, ON_EACH_ROW, rowExpressions, sorts, subqueries`

Fields inherited from interface org.eclipse.birt.data.engine.api.IGroupDefinition
`DAY_INTERVAL, HOUR_INTERVAL, MINUTE_INTERVAL, MONTH_INTERVAL, NO_INTERVAL, NO_SORT, NUMERIC_INTERVAL, QUARTER_INTERVAL, SECOND_INTERVAL, SORT_ASC, SORT_DESC, STRING_PREFIX_INTERVAL, WEEK_INTERVAL, YEAR_INTERVAL`

Constructor Summary
`GroupDefinition()` Deprecated.
`GroupDefinition(java.lang.String name)` Constructs a group with the given name

Method Summary
`int` | `getInterval()` Returns the interval for grouping on a range of contiguous group key values.
`double` | `getIntervalRange()` Returns the number of contiguous group intervals that form one single group, when Interval is used to define group break level.
`java.lang.Object` | `getIntervalStart()` Gets the starting value for the first interval
`java.lang.String` | `getKeyColumn()` Returns the name of the column that defines the group key.
`java.lang.String` | `getKeyExpression()` Returns the JavaScript expression that defines the group key.
`java.lang.String` | `getName()` Returns the name of the group
`int` | `getSortDirection()` Returns the sort direction on the group key.
`void` | `setInterval(int interval)`
`void` | `setIntervalRange(double intervalRange)`
`void` | `setIntervalStart(java.lang.Object start)`
`void` | `setKeyColumn(java.lang.String keyColumn)`
`void` | `setKeyExpression(java.lang.String keyExpr)`
`void` | `setSortDirection(int sortDirection)`

Methods inherited from class org.eclipse.birt.data.engine.api.querydefn.BaseTransform
`addFilter, addSort, addSubquery, getFilters, getSorts, getSubqueries`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.eclipse.birt.data.engine.api.IBaseTransform
`getFilters, getSorts, getSubqueries`

Field Detail

### name

    protected java.lang.String name

### keyExpr

    protected java.lang.String keyExpr

### keyColumn

    protected java.lang.String keyColumn

### interval

    protected int interval

### intervalRange

    protected double intervalRange

### sortDirection

    protected int sortDirection

### intervalStart

    protected java.lang.Object intervalStart

Constructor Detail

### GroupDefinition

    public GroupDefinition(java.lang.String name)

  Constructs a group with the given name

### GroupDefinition

    public GroupDefinition()

  Deprecated.

  Constructs an unnamed group

Method Detail

### getName

    public java.lang.String getName()

  Returns the name of the group

  Specified by:
    `getName` in interface `IGroupDefinition`
  Returns:
    Name of group. Can be null if group is unnamed.

### getInterval

    public int getInterval()

  Returns the interval for grouping on a range of contiguous group key values. Interval can be year, months, day, etc.

  Specified by:
    `getInterval` in interface `IGroupDefinition`
  Returns:
    the grouping interval

### getSortDirection

    public int getSortDirection()

  Returns the sort direction on the group key. Use this to specify a sort in the common case where the groups are ordered by the group key only. To specify other types of sort criteria, use the Sorts property. SortDirection is ignored if Sorts is defined for this group.

  Specified by:
    `getSortDirection` in interface `IGroupDefinition`
  Returns:
    The group key sort direction. If no direction is specified, `NO_SORT` is returned. This means that the data engine can choose any sort order, or no sort order at all, for this group level.

### getIntervalRange

    public double getIntervalRange()

  Returns the number of contiguous group intervals that form one single group, when Interval is used to define group break level. For example, if Interval is `MONTH_INTERVAL`, and IntervalRange is 6, each group is defined to contain a span of 6 months.

  Specified by:
    `getIntervalRange` in interface `IGroupDefinition`

### getIntervalStart

    public java.lang.Object getIntervalStart()

  Gets the starting value for the first interval

  Specified by:
    `getIntervalStart` in interface `IGroupDefinition`

### getKeyColumn

    public java.lang.String getKeyColumn()

  Returns the name of the column that defines the group key. Either the KeyColumn or KeyExpr can be used to define the group key.

  Specified by:
    `getKeyColumn` in interface `IGroupDefinition`

### getKeyExpression

    public java.lang.String getKeyExpression()

  Returns the JavaScript expression that defines the group key.
  Note: Presently group key must be a column. If an JavaScript expression is used to specify the group key, the expression must be in the form of row.column_name, or row["column_name"].

  Specified by:
    `getKeyExpression` in interface `IGroupDefinition`

### setInterval

    public void setInterval(int interval)

  Parameters:
    `interval` - The interval to set.

### setIntervalRange

    public void setIntervalRange(double intervalRange)

  Parameters:
    `intervalRange` - The intervalRange to set.

### setIntervalStart

    public void setIntervalStart(java.lang.Object start)

  Parameters:
    `start` - a start value for the first interval

### setKeyColumn

    public void setKeyColumn(java.lang.String keyColumn)

  Parameters:
    `keyColumn` - Name of the column to group by

### setKeyExpression

    public void setKeyExpression(java.lang.String keyExpr)

  Parameters:
    `keyExpr` - Key expression to group by

### setSortDirection

    public void setSortDirection(int sortDirection)

  Parameters:
    `sortDirection` - The sortDirection to set.

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