edu.umd.cs.findbugs.detect

Class LazyInit

java.lang.Object

edu.umd.cs.findbugs.ByteCodePatternDetector

edu.umd.cs.findbugs.detect.LazyInit

All Implemented Interfaces:

Detector, Priorities, StatelessDetector, java.lang.Cloneable

public final class LazyInit
extends ByteCodePatternDetector
implements StatelessDetector

Field Summary

Fields inherited from interface edu.umd.cs.findbugs.Priorities

EXP_PRIORITY, HIGH_PRIORITY, IGNORE_PRIORITY, LOW_PRIORITY, NORMAL_PRIORITY

Constructor Summary

Constructors

Constructor and Description
LazyInit(BugReporter bugReporter)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone()
BugReporter	getBugReporter()
ByteCodePattern	getPattern() Get the ByteCodePattern for this detector.
boolean	prescreen(org.apache.bcel.classfile.Method method, ClassContext classContext) Prescreen a method.
void	reportMatch(ClassContext classContext, org.apache.bcel.classfile.Method method, ByteCodePatternMatch match) Called to report an instance of the ByteCodePattern.

Methods inherited from class edu.umd.cs.findbugs.ByteCodePatternDetector

report, visitClassContext

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyInit

public LazyInit(BugReporter bugReporter)

Method Detail

clone

public java.lang.Object clone()

Specified by:

clone in interface StatelessDetector

Overrides:

clone in class java.lang.Object

getBugReporter

public BugReporter getBugReporter()

Specified by:

getBugReporter in class ByteCodePatternDetector

getPattern

public ByteCodePattern getPattern()

Description copied from class: ByteCodePatternDetector

Get the ByteCodePattern for this detector.

Specified by:

getPattern in class ByteCodePatternDetector

prescreen

public boolean prescreen(org.apache.bcel.classfile.Method method,
                         ClassContext classContext)

Description copied from class: ByteCodePatternDetector

Prescreen a method. It is a valid, but dumb, implementation simply to return true unconditionally. A better implementation is to call ClassContext.getBytecodeSet() to check whether the method actually contains the bytecode instructions that the pattern will look for. The theory is that checking the bytecode set is very fast, while building the MethodGen, CFG, ValueNumberAnalysis, etc. objects required to match ByteCodePatterns is slow, and the bytecode pattern matching algorithm is also not particularly fast.

As a datapoint, prescreening speeds up the BCPDoubleCheck detector by a factor of 5 with no loss of generality and only a dozen or so extra lines of code.

Specified by:

prescreen in class ByteCodePatternDetector

Parameters:

method - the method

classContext - the ClassContext for the method

Returns:

true if the method should be analyzed for instances of the ByteCodePattern

reportMatch

public void reportMatch(ClassContext classContext,
                        org.apache.bcel.classfile.Method method,
                        ByteCodePatternMatch match)
                 throws CFGBuilderException,
                        DataflowAnalysisException

Description copied from class: ByteCodePatternDetector

Called to report an instance of the ByteCodePattern.

Specified by:

reportMatch in class ByteCodePatternDetector

Parameters:

classContext - the ClassContext for the analyzed class

method - the method to instance appears in

match - the ByteCodePatternMatch object representing the match of the ByteCodePattern against actual instructions in the method

Throws:

CFGBuilderException

DataflowAnalysisException