com.appiancorp.common.query

Interface Projection<T extends Column>

Type Parameters:

T - Type of Column it encapsulates.

All Superinterfaces:

java.lang.Cloneable

All Known Implementing Classes:

Aggregation, Selection

@GwtCompatible
public interface Projection<T extends Column>
extends java.lang.Cloneable

Marker interface for Selection and Aggregation.

This represents the selected columns in a Query object.

The reason why this class exist is to encapsulate the List of columns, otherwise we could have ended up having a list mixed with Column and AggregationColumn when they are mutually exclusive and is not a valid configuration.

Method Summary

Modifier and Type	Method and Description
Projection<T>	clone() Returns a new Projection containing the same data as this Projection.
java.util.List<T>	getColumns() Returns the list of projected columns

Method Detail

getColumns

java.util.List<T> getColumns()

Returns the list of projected columns

Returns:

the list of projected columns

clone

Projection<T> clone()

Returns a new Projection containing the same data as this Projection. This is not a deep clone, it just creates new lists to allow data manipulation.

Returns:

new Projection containing the same data as this Projection copied by value.