FindBugs™ 1.3.9

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

java.lang.Object
  extended by 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

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