Package com.offbynull.coroutines.instrumenter.asm

Class ClassResourceClassInformationRepository

java.lang.Object

com.offbynull.coroutines.instrumenter.asm.ClassResourceClassInformationRepository

All Implemented Interfaces:

ClassInformationRepository

public final class ClassResourceClassInformationRepository
extends Object
implements ClassInformationRepository

Provides information on classes contained within a ClassLoader. The difference between this class and ClassLoaderClassInformationRepository is that this class loads the class as a resource (byte array) instead of actually loading the class in to the JVM. Parsing of the resource is done the same way as FileSystemClassInformationRepository.

This is an attempt to work around the issue with loading classes and ClassFileTransformer (something we need to do for resolving stack map frames after instrumenting the class). If ClassFileTransformer.transform(java.lang.ClassLoader, java.lang.String, java.lang.Class, java.security.ProtectionDomain, byte[]) calls Class.forName(java.lang.String) for a class that hasn't been passed to that transformer yet, that class will never get passed to that transformer.

As a work-around, we load the class bytes and parse that rather than loading the actual class.

See Also:

• ClassLoaderClassInformationRepository

Field Summary

Fields

Modifier and Type	Field	Description
private final ClassLoader	classLoader

Constructor Summary

Constructors

Constructor	Description
ClassResourceClassInformationRepository(ClassLoader classLoader)	Constructs a ClassLoaderClassInformationRepository object.

Method Summary

Modifier and Type	Method	Description
ClassInformation	getInformation(String internalClassName)	Get information for a class.

Methods inherited from class java.lang.Object

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

Field Details

classLoader

private final ClassLoader classLoader

Constructor Details

ClassResourceClassInformationRepository

public ClassResourceClassInformationRepository(ClassLoader classLoader)

Constructs a ClassLoaderClassInformationRepository object.

Parameters:

classLoader - classloader to extract information from

Throws:

NullPointerException - if any argument is null

Method Details

getInformation

public ClassInformation getInformation(String internalClassName)

Description copied from interface: ClassInformationRepository

Get information for a class.

This method returns class information as if it were encountered in a class file. In a class file, if the class is an interface, then its superclass is set to Object. Note that this is different from what Class.getSuperclass() returns when the class represents an interface (it returns null).

Specified by:

getInformation in interface ClassInformationRepository

Parameters:

internalClassName - internal class name

Returns:

information for that class, or null if not found