simpledb.materialize
Class GroupValue

java.lang.Object
  simpledb.materialize.GroupValue

public class GroupValue
extends Object

An object that holds the values of the grouping fields for the current record of a scan.

Author:

Edward Sciore

Constructor Summary

GroupValue(Scan s, Collection<String> fields)
Creates a new group value, given the specified scan and list of fields.

Method Summary

boolean	equals(Object obj) Two GroupValue objects are equal if they have the same values for their grouping fields.
Constant	getVal(String fldname) Returns the Constant value of the specified field in the group.
int	hashCode() The hashcode of a GroupValue object is the sum of the hashcodes of its field values.

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupValue

public GroupValue(Scan s,
                  Collection<String> fields)

Creates a new group value, given the specified scan and list of fields. The values in the current record of each field are stored.

Parameters:

s - a scan

fields - the list of fields

Method Detail

getVal

public Constant getVal(String fldname)

Returns the Constant value of the specified field in the group.

Parameters:

fldname - the name of a field

Returns:

the value of the field in the group

equals

public boolean equals(Object obj)

Two GroupValue objects are equal if they have the same values for their grouping fields.

Overrides:

equals in class Object

See Also:

Object.equals(java.lang.Object)

hashCode

public int hashCode()

The hashcode of a GroupValue object is the sum of the hashcodes of its field values.

Overrides:

hashCode in class Object

See Also:

Object.hashCode()