org.apache.hadoop.hive.ql.lib

Class TypeRule

java.lang.Object

org.apache.hadoop.hive.ql.lib.TypeRule

All Implemented Interfaces:

Rule, SemanticRule

public class TypeRule
extends Object
implements SemanticRule

Rule that matches a particular type of node.

Constructor Summary

Constructors

Constructor and Description
TypeRule(Class<?> nodeClass)

Method Summary

Modifier and Type	Method and Description
int	cost(Stack<Node> stack)
String	getName()

Methods inherited from class java.lang.Object

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

Constructor Detail

TypeRule

public TypeRule(Class<?> nodeClass)

Method Detail

cost

public int cost(Stack<Node> stack)
         throws SemanticException

Specified by:

cost in interface Rule

Specified by:

cost in interface SemanticRule

Returns:

the cost of the rule - the lower the cost, the better the rule matches

Throws:

SemanticException

getName

public String getName()

Specified by:

getName in interface Rule

Specified by:

getName in interface SemanticRule

Returns:

the name of the rule - may be useful for debugging