eworks.eRQL.model
Class Disjunction

java.lang.Object
  eworks.eRQL.model.ModelComponent
      eworks.eRQL.model.Value
          eworks.eRQL.model.Junction
              eworks.eRQL.model.Disjunction

public class Disjunction

extends Junction

Represents a disjunction of subqueries.

Version:

1.00 (2003-11-03)

Author:

Fabian Wleklinski (fabian@wleklinski.de)

Field Summary

Fields inherited from class eworks.eRQL.model.Junction

values

Constructor Summary

Disjunction()
Creates a new and empty disjunction.

Disjunction(Value value)
Creates a new disjunction and initializes it with a single value.

Disjunction(Value v1, Value v2)
Creates a new dicjunction and initializes it with two values.

Method Summary

Tuples

query(RqlEngine rqlEngine) Evaluates this disjunction and returns the result.

Methods inherited from class eworks.eRQL.model.Junction

add, compact, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Disjunction

public Disjunction()

Creates a new and empty disjunction.

Disjunction

public Disjunction(Value value)

Creates a new disjunction and initializes it with a single value.

Parameters:

value - The value for the initialization of the disjunction.

Disjunction

public Disjunction(Value v1,
                   Value v2)

Creates a new dicjunction and initializes it with two values.

Parameters:

v1 - The first value for the initialization of the disjunction.

v2 - The second value for the initialization of the disjunction.

Method Detail

query

public Tuples query(RqlEngine rqlEngine)
             throws RqlExecutingException

Evaluates this disjunction and returns the result.

Specified by:

query in class Value

Parameters:

rqlEngine - The RqlEngine to execute.

Returns:

The subquery's result.

Throws:

RqlExecutingException - if something goes wrong.