com.sun.labs.minion.retrieval
Class And

java.lang.Object
  com.sun.labs.minion.retrieval.QueryElement
      com.sun.labs.minion.retrieval.Operator
          com.sun.labs.minion.retrieval.And

All Implemented Interfaces:

java.lang.Comparable

public class And
extends Operator

Field Summary

protected static java.lang.String

logTag

Fields inherited from class com.sun.labs.minion.retrieval.Operator

operands

Fields inherited from class com.sun.labs.minion.retrieval.QueryElement

estSize, fieldMultipliers, inOrder, keepPositions, order, part, qc, qs, searchFieldNames, searchFields, strictEval, wc, wf

Constructor Summary

And(java.util.List operands)
Constructs an AND operator that takes a list of operands.

Method Summary

protected static ArrayGroup	and(ArrayGroup ag, java.util.List operands)
protected static ArrayGroup	and(ArrayGroup ag, java.util.List operands, boolean strict) Runs an intersection of all of the given operands.
protected int	calculateEstimatedSize() Estimates the size of the results set.
ArrayGroup	eval(ArrayGroup ag) Evaluates this operator, returning the results.

Methods inherited from class com.sun.labs.minion.retrieval.Operator

addSearchFieldName, getOperands, getQueryTerms, setOperands, setPartition, setQueryConfig, setWeightingComponents, setWeightingFunction, toString, toString, toStringMod

Methods inherited from class com.sun.labs.minion.retrieval.QueryElement

compareTo, dump, estimateSize, getInOrder, getOrder, getQueryStats, getQueryTerms, getSearchFieldNames, setInOrder, setOrder, setQueryStats, setSearchFields

Methods inherited from class java.lang.Object

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

Field Detail

logTag

protected static java.lang.String logTag

Constructor Detail

And

public And(java.util.List operands)

Constructs an AND operator that takes a list of operands.

Method Detail

calculateEstimatedSize

protected int calculateEstimatedSize()

Estimates the size of the results set.

Specified by:

calculateEstimatedSize in class QueryElement

Returns:

The estimated size of the results set for this element. This is meant to be an as-tight-as-possible estimate of the results set size. It is acceptable to overestimate, but not to underestimate the size of the result set.

eval

public ArrayGroup eval(ArrayGroup ag)

Evaluates this operator, returning the results.

Overrides:

eval in class QueryElement

and

protected static ArrayGroup and(ArrayGroup ag,
                                java.util.List operands)

and

protected static ArrayGroup and(ArrayGroup ag,
                                java.util.List operands,
                                boolean strict)

Runs an intersection of all of the given operands. This can be used by other classes that want to do an intersection.

Parameters:

ag - Any initial group. May be null.

operands - The operands to process.