org.eclipse.viatra.query.runtime.localsearch.operations.extend

Class ExtendOperation<T>

java.lang.Object

org.eclipse.viatra.query.runtime.localsearch.operations.extend.ExtendOperation<T>

All Implemented Interfaces:

ISearchOperation

Direct Known Subclasses:

AggregatorExtend, CountOperation, ExpressionEval, ExtendConstant, ExtendToEStructuralFeatureSource, ExtendToEStructuralFeatureTarget, IterateOverChildren, IterateOverContainers, IterateOverEClassInstances, IterateOverEDatatypeInstances

public abstract class ExtendOperation<T>
extends java.lang.Object
implements ISearchOperation

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Iterator<T>	it
protected int	position

Constructor Summary

Constructors

Constructor and Description
ExtendOperation(int position)

Method Summary

Modifier and Type	Method and Description
boolean	execute(MatchingFrame frame, ISearchContext context)
void	onBacktrack(MatchingFrame frame, ISearchContext context) After the execution of the operation failed and ISearchOperation.execute(MatchingFrame, ISearchContext) returns false, the onBacktrack callback is evaluated.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.viatra.query.runtime.localsearch.operations.ISearchOperation

getVariablePositions, onInitialize

Field Detail

position

protected int position

it

protected java.util.Iterator<T> it

Constructor Detail

ExtendOperation

public ExtendOperation(int position)

Parameters:

position -

Method Detail

onBacktrack

public void onBacktrack(MatchingFrame frame,
                        ISearchContext context)

Description copied from interface: ISearchOperation

After the execution of the operation failed and ISearchOperation.execute(MatchingFrame, ISearchContext) returns false, the onBacktrack callback is evaluated. Operations may use this method to clean up any temporary structures, and make the operation ready for a new execution.

Specified by:

onBacktrack in interface ISearchOperation

execute

public boolean execute(MatchingFrame frame,
                       ISearchContext context)

Specified by:

execute in interface ISearchOperation

Returns:

true if successful, or false if backtracking needed