Package com.google.common.truth

Class StackTraceCleaner

java.lang.Object

com.google.common.truth.StackTraceCleaner

final class StackTraceCleaner
extends Object

Utility that cleans stack traces to remove noise from common frameworks.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static enum	StackTraceCleaner.StackFrameType	Enum of the package or class-name based categories of stack frames that might be removed or collapsed by the cleaner.
private static class	StackTraceCleaner.StackTraceElementWrapper	Wrapper around a StackTraceElement for calculating and holding the metadata used to clean the stack trace.

Field Summary

Fields

Modifier and Type	Field	Description
private final List<StackTraceCleaner.StackTraceElementWrapper>	cleanedStackTrace
(package private) static final String	CLEANER_LINK
private int	currentStreakLength
private StackTraceCleaner.StackFrameType	currentStreakType
private static final com.google.common.collect.ImmutableSet<Class<?>>	JUNIT_INFRASTRUCTURE_CLASSES
private StackTraceCleaner.StackTraceElementWrapper	lastStackFrameElementWrapper
private static final com.google.common.collect.ImmutableSet<Class<?>>	STANDARD_SUBJECT_BUILDER_CLASS
private static final com.google.common.collect.ImmutableSet<Class<?>>	SUBJECT_CLASS
private final Throwable	throwable

Constructor Summary

Constructors

Modifier	Constructor	Description
private	StackTraceCleaner(Throwable throwable)	A new instance is instantiated for each throwable to be cleaned.

Method Summary

Modifier and Type	Method	Description
private void	addToStreak(StackTraceCleaner.StackTraceElementWrapper stackTraceElementWrapper)	Either adds the given frame to the running streak or closes out the running streak and starts a new one.
private void	clean(Set<Throwable> seenThrowables)	Cleans the stack trace on throwable, replacing the trace that was originally on it.
(package private) static void	cleanStackTrace(Throwable throwable)	Call Platform.cleanStackTrace(java.lang.Throwable) rather than calling this directly.
private void	clearStreak()	Resets the streak counter.
private static StackTraceCleaner.StackTraceElementWrapper	createStreakReplacementFrame(StackTraceCleaner.StackFrameType stackFrameType, int length)
private void	endStreak()	Ends the current streak, adding a summary frame to the result.
private static boolean	isFromClassDirectly(StackTraceElement stackTraceElement, com.google.common.collect.ImmutableSet<Class<?>> recognizedClasses)
private static boolean	isFromClassOrClassNestedInside(StackTraceElement stackTraceElement, com.google.common.collect.ImmutableSet<Class<?>> recognizedClasses)
private static boolean	isJUnitIntrastructure(StackTraceElement stackTraceElement)
private static boolean	isStackTraceCleaningDisabled()	Returns true if stack trace cleaning is explicitly disabled in a system property.
private static boolean	isTruthEntrance(StackTraceElement stackTraceElement)
private static Class<?>	loadClass(String name)

Methods inherited from class java.lang.Object

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

Field Details

CLEANER_LINK

static final String CLEANER_LINK

See Also:

• Constant Field Values

throwable

private final Throwable throwable

cleanedStackTrace

private final List<StackTraceCleaner.StackTraceElementWrapper> cleanedStackTrace

lastStackFrameElementWrapper

private StackTraceCleaner.StackTraceElementWrapper lastStackFrameElementWrapper

currentStreakType

private StackTraceCleaner.StackFrameType currentStreakType

currentStreakLength

private int currentStreakLength

SUBJECT_CLASS

private static final com.google.common.collect.ImmutableSet<Class<?>> SUBJECT_CLASS

STANDARD_SUBJECT_BUILDER_CLASS

private static final com.google.common.collect.ImmutableSet<Class<?>> STANDARD_SUBJECT_BUILDER_CLASS

JUNIT_INFRASTRUCTURE_CLASSES

private static final com.google.common.collect.ImmutableSet<Class<?>> JUNIT_INFRASTRUCTURE_CLASSES

Constructor Details

StackTraceCleaner

private StackTraceCleaner(Throwable throwable)

A new instance is instantiated for each throwable to be cleaned. This is so that helper methods can make use of instance variables describing the state of the cleaning process.

Method Details

cleanStackTrace

static void cleanStackTrace(Throwable throwable)

Call Platform.cleanStackTrace(java.lang.Throwable) rather than calling this directly.

Cleans the stack trace on the given Throwable, replacing the original stack trace stored on the instance (see Throwable.setStackTrace(StackTraceElement[])).

Removes Truth stack frames from the top and JUnit framework and reflective call frames from the bottom. Collapses the frames for various frameworks in the middle of the trace as well.

clean

private void clean(Set<Throwable> seenThrowables)

Cleans the stack trace on throwable, replacing the trace that was originally on it.

addToStreak

private void addToStreak(StackTraceCleaner.StackTraceElementWrapper stackTraceElementWrapper)

Either adds the given frame to the running streak or closes out the running streak and starts a new one.

endStreak

private void endStreak()

Ends the current streak, adding a summary frame to the result. Resets the streak counter.

clearStreak

private void clearStreak()

Resets the streak counter.

isTruthEntrance

private static boolean isTruthEntrance(StackTraceElement stackTraceElement)

isJUnitIntrastructure

private static boolean isJUnitIntrastructure(StackTraceElement stackTraceElement)

isFromClassOrClassNestedInside

private static boolean isFromClassOrClassNestedInside(StackTraceElement stackTraceElement,
 com.google.common.collect.ImmutableSet<Class<?>> recognizedClasses)

isFromClassDirectly

private static boolean isFromClassDirectly(StackTraceElement stackTraceElement,
 com.google.common.collect.ImmutableSet<Class<?>> recognizedClasses)

loadClass

private static Class<?> loadClass(String name)
                           throws ClassNotFoundException

Throws:

ClassNotFoundException

createStreakReplacementFrame

private static StackTraceCleaner.StackTraceElementWrapper createStreakReplacementFrame(StackTraceCleaner.StackFrameType stackFrameType,
 int length)

isStackTraceCleaningDisabled

private static boolean isStackTraceCleaningDisabled()

Returns true if stack trace cleaning is explicitly disabled in a system property. This switch is intended to be used when attempting to debug the frameworks which are collapsed or filtered out of stack traces by the cleaner.