com.sun.labs.minion.query
Class Relation

java.lang.Object
  com.sun.labs.minion.query.Element
      com.sun.labs.minion.query.Relation

Direct Known Subclasses:

StringRelation

public class Relation
extends Element

A class for a simple relational query, like price < 10. Such queries can be run on any field that has the SAVED attribute. While this class can be used for simple relations on string fields, StringRelation provides the full set of relational operators that can be applied to string fields.

Note that this API cannot currently check whether the field provided for the relation is a saved field. This will be checked when the query is evaluated and a warning provided then.

Nested Class Summary

static class

Relation.Operator The saved field operators.

Field Summary

protected java.lang.String	field
protected Relation.Operator	operator
protected java.lang.String	value

Fields inherited from class com.sun.labs.minion.query.Element

fields, strict

Constructor Summary

protected	Relation()
	Relation(java.lang.String field, Relation.Operator operator, java.lang.String value)

Method Summary

java.lang.String	getField()
Relation.Operator	getOperator()
QueryElement	getQueryElement() Transduces this query element into a "real" query element, one that can be evaluated by the search engine.
java.lang.String	getValue()
java.lang.String	toString()

Methods inherited from class com.sun.labs.minion.query.Element

addField, getFields, getStrict, setFields, setStrict

Methods inherited from class java.lang.Object

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

Field Detail

field

protected java.lang.String field

operator

protected Relation.Operator operator

value

protected java.lang.String value

Constructor Detail

Relation

protected Relation()

Relation

public Relation(java.lang.String field,
                Relation.Operator operator,
                java.lang.String value)

Method Detail

getField

public java.lang.String getField()

getOperator

public Relation.Operator getOperator()

getValue

public java.lang.String getValue()

getQueryElement

public QueryElement getQueryElement()

Description copied from class: Element

Transduces this query element into a "real" query element, one that can be evaluated by the search engine.

Specified by:

getQueryElement in class Element

Returns:

an evaluatable query element.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object