Package org.apache.pekko.util

Class LineNumbers

java.lang.Object

org.apache.pekko.util.LineNumbers

public class LineNumbers
extends Object

This is a minimized byte-code parser that concentrates exclusively on line numbers and source file extraction. It works for all normal classes up to format 52:0 (JDK8), and it also works for Lambdas that are Serializable. The latter restriction is due to the fact that the proxy object generated by LambdaMetafactory otherwise contains no information about which method backs this particular lambda (and there might be multiple defined within a single class).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LineNumbers.NoSourceInfo$
static interface	LineNumbers.Result
static final class	LineNumbers.SourceFile
static class	LineNumbers.SourceFile$
static final class	LineNumbers.SourceFileLines
static class	LineNumbers.SourceFileLines$
static final class	LineNumbers.UnknownSourceFormat
static class	LineNumbers.UnknownSourceFormat$

Constructor Summary

Constructors

Constructor	Description
LineNumbers()

Method Summary

Modifier and Type	Method	Description
static LineNumbers.Result	apply(Object obj)	Scala API: Obtain line number information for the class defining the given object.
static String	prettyName(Object obj)	Extract source information if available and format a string to identify the class definition in question.

Methods inherited from class java.lang.Object

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

Constructor Details

LineNumbers

public LineNumbers()

Method Details

apply

public static LineNumbers.Result apply(Object obj)

Scala API: Obtain line number information for the class defining the given object. This is done by reading the byte code (a potentially blocking IO operation) and interpreting the debug information that it may contain.

This does not work for Java 8 lambdas that are not Serializable, because the language designers have consciously made it impossible to obtain the byte code for those.

prettyName

public static String prettyName(Object obj)

Extract source information if available and format a string to identify the class definition in question. This will include the package name and either source file information or the class name.