edu.umd.cs.findbugs.ba.npe
Class IsNullConditionDecision

java.lang.Object
  edu.umd.cs.findbugs.ba.npe.IsNullConditionDecision

public class IsNullConditionDecision
extends java.lang.Object

A control decision which resulted in information being gained about whether a particular value is null or non-null on the IFCMP_EDGE and FALL_THROUGH_EDGE branches.

See Also:

IsNullValue, IsNullValueFrame, IsNullValueAnalysis

Constructor Summary

IsNullConditionDecision(ValueNumber value, IsNullValue ifcmpDecision, IsNullValue fallThroughDecision)
Constructor.

Method Summary

boolean	equals(java.lang.Object o)
IsNullValue	getDecision(int edgeType) Get the decision reached about the value on outgoing edge of given type.
ValueNumber	getValue() Get the value about which the branch yields information.
int	hashCode()
boolean	isEdgeFeasible(int edgeType) Determine whether or not the given edge is feasible.
boolean	isRedundant() Determine whether or not the comparison is redundant.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

IsNullConditionDecision

public IsNullConditionDecision(@CheckForNull
                               ValueNumber value,
                               @CheckForNull
                               IsNullValue ifcmpDecision,
                               @CheckForNull
                               IsNullValue fallThroughDecision)

Constructor.

Parameters:

value - the ValueNumber for which we have new information; null if no new information

ifcmpDecision - the decision for the IFCMP_EDGE; null if that edge is not feasible

fallThroughDecision - the decision for the FALL_THROUGH_EDGE; null if that edge is not feasible

Method Detail

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

getValue

public ValueNumber getValue()

Get the value about which the branch yields information.

isRedundant

public boolean isRedundant()

Determine whether or not the comparison is redundant.

isEdgeFeasible

public boolean isEdgeFeasible(int edgeType)

Determine whether or not the given edge is feasible. An edge may be infeasible if the comparison is redundant (i.e., can only be determined one way)

Parameters:

edgeType - the type of edge; must be IFCMP_EDGE or FALL_THROUGH_EDGE

Returns:

true if the edge is feasible, false if infeasible

getDecision

@CheckForNull
public IsNullValue getDecision(int edgeType)

Get the decision reached about the value on outgoing edge of given type.

Parameters:

edgeType - the type of edge; must be IFCMP_EDGE or FALL_THROUGH_EDGE

Returns:

the IsNullValue representing the decision, or null if the edge is infeasible

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object