Package org.apache.qpid.server.query.engine.parsing.expression.set

Class AbstractSetExpression<T,R>

java.lang.Object

org.apache.qpid.server.query.engine.parsing.expression.AbstractExpressionNode<T,R>

org.apache.qpid.server.query.engine.parsing.expression.set.AbstractSetExpression<T,R>

Type Parameters:

T - Input parameter type

R - Output parameter type

All Implemented Interfaces:

Function<T,R>, Expression<T,R>, ExpressionNode<T,R>, SetExpression<T,R>

Direct Known Subclasses:

EmptySetExpression, IntersectExpression, MinusExpression, SelectExpression, UnionExpression

public abstract class AbstractSetExpression<T,R>
extends AbstractExpressionNode<T,R>
implements SetExpression<T,R>

Abstract class containing base functionality for set expressions

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	_distinct	Distinct flag

Fields inherited from class org.apache.qpid.server.query.engine.parsing.expression.AbstractExpressionNode

_metadata

Constructor Summary

Constructors

Constructor	Description
AbstractSetExpression(boolean distinct)	Constructor stores distinct flag
AbstractSetExpression(boolean distinct, ExpressionNode<T,R> left, ExpressionNode<T,R> right)	Constructor initializes children expression list and validates their compatibility

Method Summary

Modifier and Type	Method	Description
List<ProjectionExpression<T,R>>	getProjections()	Returns list of projections
List<SelectExpression<T,R>>	getSelections()	Returns list of select expressions

Methods inherited from class org.apache.qpid.server.query.engine.parsing.expression.AbstractExpressionNode

containsAggregation, ctx, evaluateChild, getAggregations, getAlias, getChild, getChildren, getParent, isAccessor, isInstantlyEvaluable, setAlias, setParent, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.qpid.server.query.engine.parsing.expression.Expression

andThen, apply

Methods inherited from interface org.apache.qpid.server.query.engine.parsing.expression.ExpressionNode

containsAggregation, getAggregations, getAlias, getChildren, getParent, isAccessor, isInstantlyEvaluable, setAlias, setParent

Methods inherited from interface java.util.function.Function

andThen, compose

Field Detail

_distinct

protected boolean _distinct

Distinct flag

Constructor Detail

AbstractSetExpression

public AbstractSetExpression(boolean distinct)

Constructor stores distinct flag

Parameters:

distinct - Distinct flag

AbstractSetExpression

public AbstractSetExpression(boolean distinct,
                             ExpressionNode<T,R> left,
                             ExpressionNode<T,R> right)

Constructor initializes children expression list and validates their compatibility

Parameters:

distinct - Distinct flag

left - Left expression

right - Right expression

Method Detail

getProjections

public List<ProjectionExpression<T,R>> getProjections()

Returns list of projections

Specified by:

getProjections in interface SetExpression<T,R>

Returns:

List of projections

getSelections

public List<SelectExpression<T,R>> getSelections()

Returns list of select expressions

Specified by:

getSelections in interface SetExpression<T,R>

Returns:

List of select expressions