de.uka.ipd.sdq.beagle.core.evaluableexpressions.util

Class PartialExpressionTreeWalker

java.lang.Object

de.uka.ipd.sdq.beagle.core.evaluableexpressions.util.ExpressionTreeWalker

de.uka.ipd.sdq.beagle.core.evaluableexpressions.util.PartialExpressionTreeWalker

Direct Known Subclasses:

ModifyingEvaluableExpressionVisitor, RecursiveEvaluableExpressionVisitor

public abstract class PartialExpressionTreeWalker
extends ExpressionTreeWalker

An evaluable expression tree walker allowing to ignore certain subtrees. The class offers a mechanism to stop visiting of inner expressions, forcing the visitor not to traverse the expression tree any further. Instead, the traversal will go “up” again, only calling after hooks, until it terminates at the root or traversal of inner expressions is activated again.

Constructor Summary

Constructors

Constructor and Description
PartialExpressionTreeWalker()

Method Summary

Modifier and Type	Method and Description
protected void	startTraversingInnerExpressions() Starts visiting of inner expressions.
protected void	stopTraversingInnerExpressions() Stops visiting of inner expressions.
protected boolean	willTraverseInnerExpressions() Queries whether the visitor will visit inner expressions.

Methods inherited from class de.uka.ipd.sdq.beagle.core.evaluableexpressions.util.ExpressionTreeWalker

afterAddition, afterComparison, afterConstant, afterDivision, afterExponentation, afterExponentialFunction, afterExpression, afterIfThenElse, afterLogarithm, afterMultiplication, afterNaturalLogarithm, afterOther, afterSine, afterSubtraction, afterVariable, atAddition, atComparison, atConstant, atDivision, atExponentation, atExponentialFunction, atExpression, atIfThenElse, atLogarithm, atMultiplication, atNaturalLogarithm, atOther, atSine, atSubtraction, atVariable, getTraversalDepth, getVisitedCount

Methods inherited from class java.lang.Object

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

Constructor Detail

PartialExpressionTreeWalker

public PartialExpressionTreeWalker()

Method Detail

stopTraversingInnerExpressions

protected void stopTraversingInnerExpressions()

Stops visiting of inner expressions. As soon as this method is called, this visitor will no longer visit inner expressions. This means that only after hooks of already visited expressions will be called until the root is reached.

See Also:

startTraversingInnerExpressions()

startTraversingInnerExpressions

protected void startTraversingInnerExpressions()

Starts visiting of inner expressions. Inner expressions will be traverse depth-first as long as it is activated.

See Also:

stopTraversingInnerExpressions()

willTraverseInnerExpressions

protected boolean willTraverseInnerExpressions()

Queries whether the visitor will visit inner expressions. Will return true if startTraversingInnerExpressions() was called and false if stopTraversingInnerExpressions() was called.

Returns:

Whether inner expressions will be examined for the momentary tree.