Package com.yahoo.search.grouping.request

Class MathResolver

java.lang.Object

com.yahoo.search.grouping.request.MathResolver

public class MathResolver
extends Object

This is a helper class for resolving arithmetic operations over GroupingExpression objects. To resolve an operation simply push operator-expression pairs onto it, before calling resolve() to retrieve the single corresponding grouping expression object.

Author:

Simon Thoresen Hult

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	MathResolver.Type

Constructor Summary

Constructors

Constructor	Description
MathResolver()

Method Summary

Modifier and Type	Method	Description
void	push(MathResolver.Type type, GroupingExpression exp)	Pushes the given operator-expression pair onto this math resolver.
GroupingExpression	resolve()	Converts the internal list of operator-expression pairs into a corresponding combined grouping expression.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

MathResolver

public MathResolver()

Method Details

push

public void push(MathResolver.Type type,
 GroupingExpression exp)

Pushes the given operator-expression pair onto this math resolver. Once all pairs have been pushed using this method, call resolve() to retrieve to combined grouping expression.

Parameters:

type - The operator that appears before the expression being pushed.

exp - The expression to push.

resolve

public GroupingExpression resolve()

Converts the internal list of operator-expression pairs into a corresponding combined grouping expression. When this method returns there is no residue of the conversion, and this object can be reused.

Returns:

The grouping expression corresponding to the pushed arithmetic operations.

toString

public String toString()

Overrides:

toString in class Object