Package edu.umd.cs.findbugs.ba.bcp

Class IfNull

java.lang.Object

edu.umd.cs.findbugs.ba.bcp.PatternElement

edu.umd.cs.findbugs.ba.bcp.SingleInstruction

edu.umd.cs.findbugs.ba.bcp.OneVariableInstruction

edu.umd.cs.findbugs.ba.bcp.IfNull

All Implemented Interfaces:

EdgeTypes

public class IfNull
extends OneVariableInstruction
implements EdgeTypes

Field Summary

Fields inherited from interface edu.umd.cs.findbugs.ba.EdgeTypes

BACKEDGE_SOURCE_EDGE, BACKEDGE_TARGET_EDGE, CHECKED_EXCEPTIONS_FLAG, EXIT_EDGE, EXPLICIT_EXCEPTIONS_FLAG, FALL_THROUGH_EDGE, GOTO_EDGE, HANDLED_EXCEPTION_EDGE, IFCMP_EDGE, JSR_EDGE, RET_EDGE, RETURN_EDGE, START_EDGE, SWITCH_DEFAULT_EDGE, SWITCH_EDGE, UNHANDLED_EXCEPTION_EDGE, UNKNOWN_EDGE

Constructor Summary

Constructors

Constructor	Description
IfNull(java.lang.String varName)

Method Summary

Modifier and Type	Method	Description
boolean	acceptBranch(Edge edge, org.apache.bcel.generic.InstructionHandle source)	Return whether or not it is acceptable to take the given branch.
MatchResult	match(org.apache.bcel.generic.InstructionHandle handle, org.apache.bcel.generic.ConstantPoolGen cpg, ValueNumberFrame before, ValueNumberFrame after, BindingSet bindingSet)	Return whether or not this element matches the given instruction with the given Bindings in effect.

Methods inherited from class java.lang.Object

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

Methods inherited from class edu.umd.cs.findbugs.ba.bcp.OneVariableInstruction

addOrCheckDefinition

Methods inherited from class edu.umd.cs.findbugs.ba.bcp.PatternElement

addOrCheckDefinition, allowTrailingEdges, dominatedBy, getDominatedBy, getLabel, getNext, label, lookup, setAllowTrailingEdges, setIndex, setNext, toString

Methods inherited from class edu.umd.cs.findbugs.ba.bcp.SingleInstruction

maxOccur, minOccur

Constructor Detail

IfNull

public IfNull(java.lang.String varName)

Method Detail

match

public MatchResult match(org.apache.bcel.generic.InstructionHandle handle,
                         org.apache.bcel.generic.ConstantPoolGen cpg,
                         ValueNumberFrame before,
                         ValueNumberFrame after,
                         BindingSet bindingSet)
                  throws DataflowAnalysisException

Description copied from class: PatternElement

Return whether or not this element matches the given instruction with the given Bindings in effect.

Specified by:

match in class PatternElement

Parameters:

handle - the instruction

cpg - the ConstantPoolGen from the method

before - the ValueNumberFrame representing values in the Java stack frame just before the execution of the instruction

after - the ValueNumberFrame representing values in the Java stack frame just after the execution of the instruction

bindingSet - the set of Bindings

Returns:

if the match is successful, returns a MatchResult with the PatternElement and BindingSet; if the match is not successful, returns null

Throws:

DataflowAnalysisException

acceptBranch

public boolean acceptBranch(Edge edge,
                            org.apache.bcel.generic.InstructionHandle source)

Description copied from class: PatternElement

Return whether or not it is acceptable to take the given branch.

Overrides:

acceptBranch in class SingleInstruction

Parameters:

edge - the Edge representing the branch

source - the source instruction of the branch

Returns:

true if the Edge is acceptable, false if not