UnionOptimizer (Eclipse RDF4J 4.3.2)

java.lang.Object
- org.eclipse.rdf4j.query.algebra.helpers.AbstractSimpleQueryModelVisitor<OptimizationException>
- - org.eclipse.rdf4j.federated.optimizer.UnionOptimizer

All Implemented Interfaces:

FedXOptimizer, QueryModelVisitor<OptimizationException>
```
public class UnionOptimizer
extends AbstractSimpleQueryModelVisitor<OptimizationException>
implements FedXOptimizer
```
Optimizer to flatten the UNION operations.

Author:

Andreas Schwarte

Field Summary

Fields
Modifier and Type Field Description

protected QueryInfo queryInfo

Constructor Summary

Constructors
Constructor Description

UnionOptimizer(QueryInfo queryInfo)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`handleUnionArgs(Union union, List<TupleExpr> args)`	Add the union arguments to the args list, includes a recursion step for nested unions.
`void`	`meet(Union union)`
`void`	`optimize(TupleExpr tupleExpr)`	Optimize the provided tuple expression

Methods inherited from class org.eclipse.rdf4j.query.algebra.helpers.AbstractSimpleQueryModelVisitor
meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meet, meetBinaryTupleOperator, meetBinaryValueOperator, meetCompareSubQueryValueOperator, meetNAryValueOperator, meetOther, meetSubQueryValueOperator, meetUnaryTupleOperator, meetUnaryValueOperator, meetUnsupported, meetUpdateExpr

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - queryInfo
```
protected final QueryInfo queryInfo
```
- Constructor Detail
  - UnionOptimizer
```
public UnionOptimizer(QueryInfo queryInfo)
```
- Method Detail
  - optimize
```
public void optimize(TupleExpr tupleExpr)
```
    Description copied from interface: FedXOptimizer
    
    Optimize the provided tuple expression
    
    Specified by:
    
    optimize in interface FedXOptimizer
  - meet
```
public void meet(Union union)
```
    Specified by:
    
    meet in interface QueryModelVisitor<OptimizationException>
    
    Overrides:
    
    meet in class AbstractSimpleQueryModelVisitor<OptimizationException>
  - handleUnionArgs
```
protected void handleUnionArgs(Union union,
                               List<TupleExpr> args)
```
    Add the union arguments to the args list, includes a recursion step for nested unions.
    
    Parameters:
    
    union -
    
    args -