com.mckoi.database

Class QueryPlan.MarkerNode

java.lang.Object

com.mckoi.database.QueryPlan.SingleQueryPlanNode

com.mckoi.database.QueryPlan.MarkerNode

All Implemented Interfaces:

QueryPlanNode, Serializable, Cloneable

Enclosing class:

QueryPlan

public static class QueryPlan.MarkerNode
extends QueryPlan.SingleQueryPlanNode

A marker node that takes the result of a child and marks it as a name that can later be retrieved. This is useful for implementing things such as outer joins.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.mckoi.database.QueryPlan.SingleQueryPlanNode

child

Constructor Summary

Constructors

Constructor and Description
MarkerNode(QueryPlanNode child, String mark_name) Constructor.

Method Summary

Modifier and Type	Method and Description
Object	clone() Deep clone.
Table	evaluate(QueryContext context) Evaluates the node and returns the result as a Table.
String	titleString()

Methods inherited from class com.mckoi.database.QueryPlan.SingleQueryPlanNode

child, debugString, discoverCorrelatedVariables, discoverTableNames

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MarkerNode

public MarkerNode(QueryPlanNode child,
                  String mark_name)

Constructor.

Method Detail

evaluate

public Table evaluate(QueryContext context)

Description copied from interface: QueryPlanNode

Evaluates the node and returns the result as a Table. The VariableResolver resolves any outer variables

clone

public Object clone()
             throws CloneNotSupportedException

Description copied from class: QueryPlan.SingleQueryPlanNode

Deep clone.

Specified by:

clone in interface QueryPlanNode

Overrides:

clone in class QueryPlan.SingleQueryPlanNode

Throws:

CloneNotSupportedException

titleString

public String titleString()

Overrides:

titleString in class QueryPlan.SingleQueryPlanNode