Class wais.WAISRelOp 
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Class wais.WAISRelOp 

java.lang.Object
   |
   +----query.ExpNode
           |
           +----wais.WAISRelOp
public class WAISRelOp
extends ExpNode
implements SourceNode
An ExpNode that represents a relational Operator in a WAIS query expression. Each WAISBoolOp has one child, which is always a WAISWordLiteral, and two properties: operator - a string that is the relational operator (e.g. =, >) field - the database field for the operator (e.g. au, ti)

Constructor Index

o WAISRelOp(Query, String, String)
Construct a new WAISRelOp.

Method Index

o GetField()
Return the string that is the database field for this operator.
o GetOperator()
Return the string that is the operator for this node
o RankBy(Document)
This is a slot to do some primitive ranking on this sub-tree.
o Unparse()
Return the string that represents the unparsed representation of the sub-tree rooted at this WAISRelOp.

Constructors

o WAISRelOp 
  public WAISRelOp(Query query,
                   String operator,
                   String field)
Construct a new WAISRelOp.
Parameters:
query - Query context of the relational operator
operator - String that is the operator.
field - Database field for the operator.

Methods

o GetOperator 
  public String GetOperator()
Return the string that is the operator for this node
o GetField 
  public String GetField()
Return the string that is the database field for this operator.
o Unparse 
  public String Unparse()
Return the string that represents the unparsed representation of the sub-tree rooted at this WAISRelOp.
Overrides:
Unparse in class ExpNode
o RankBy 
  public float RankBy(Document doc)
This is a slot to do some primitive ranking on this sub-tree. Unimplemented now except for the recursion
Parameters:
doc - The document to rank using this sub-tree 
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