Class BCELifier

java.lang.Object

org.apache.bcel.classfile.EmptyVisitor

org.apache.bcel.util.BCELifier

All Implemented Interfaces:

Visitor

public class BCELifier
extends EmptyVisitor

This class takes a given JavaClass object and converts it to a Java program that creates that very class using BCEL. This gives new users of BCEL a useful example showing how things are done with BCEL. It does not cover all features of BCEL, but tries to mimic hand-written code as close as possible.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	BCELifier.FLAGS	Enum corresponding to flag source.

Constructor Summary

Constructors

Constructor	Description
BCELifier(JavaClass clazz, OutputStream out)	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
static void	main(String[] argv)	Default main method.
static String	printFlags(int flags, BCELifier.FLAGS location)	Return a string with the flag settings
void	start()	Start Java code generation
void	visitField(Field field)	Visits a Field.
void	visitJavaClass(JavaClass clazz)	Visits a JavaClass.
void	visitMethod(Method method)	Visits a Method.
void	visitStackMap(StackMap stackMap)	Visits a StackMap attribute.
void	visitStackMapEntry(StackMapEntry stackMapEntry)	Visits a StackMapEntry.
void	visitStackMapType(StackMapType stackMapType)	Visits a StackMapType object.

Methods inherited from class EmptyVisitor

visitAnnotation, visitAnnotationDefault, visitAnnotationEntry, visitBootstrapMethods, visitCode, visitCodeException, visitConstantClass, visitConstantDouble, visitConstantDynamic, visitConstantFieldref, visitConstantFloat, visitConstantInteger, visitConstantInterfaceMethodref, visitConstantInvokeDynamic, visitConstantLong, visitConstantMethodHandle, visitConstantMethodref, visitConstantMethodType, visitConstantModule, visitConstantNameAndType, visitConstantPackage, visitConstantPool, visitConstantString, visitConstantUtf8, visitConstantValue, visitDeprecated, visitEnclosingMethod, visitExceptionTable, visitInnerClass, visitInnerClasses, visitLineNumber, visitLineNumberTable, visitLocalVariable, visitLocalVariableTable, visitLocalVariableTypeTable, visitMethodParameter, visitMethodParameters, visitModule, visitModuleExports, visitModuleMainClass, visitModuleOpens, visitModulePackages, visitModuleProvides, visitModuleRequires, visitNestHost, visitNestMembers, visitParameterAnnotation, visitParameterAnnotationEntry, visitPermittedSubclasses, visitSignature, visitSourceFile, visitSynthetic, visitTypeAnnotations, visitUnknown

Modifier and Type	Method	Description
void	visitAnnotation(Annotations obj)	Visits an Annotations attribute.
void	visitAnnotationDefault(AnnotationDefault obj)	Visits an AnnotationDefault attribute.
void	visitAnnotationEntry(AnnotationEntry obj)	Visits an AnnotationEntry.
void	visitBootstrapMethods(BootstrapMethods obj)	Visits a BootstrapMethods attribute.
void	visitCode(Code obj)	Visits a Code attribute.
void	visitCodeException(CodeException obj)	Visits a CodeException.
void	visitConstantClass(ConstantClass obj)	Visits a ConstantClass.
void	visitConstantDouble(ConstantDouble obj)	Visits a ConstantDouble.
void	visitConstantDynamic(ConstantDynamic obj)	Visits a ConstantDynamic.
void	visitConstantFieldref(ConstantFieldref obj)	Visits a ConstantFieldref.
void	visitConstantFloat(ConstantFloat obj)	Visits a ConstantFloat.
void	visitConstantInteger(ConstantInteger obj)	Visits a ConstantInteger.
void	visitConstantInterfaceMethodref(ConstantInterfaceMethodref obj)	Visits a ConstantInterfaceMethodref.
void	visitConstantInvokeDynamic(ConstantInvokeDynamic obj)	Visits a ConstantInvokeDynamic.
void	visitConstantLong(ConstantLong obj)	Visits a ConstantLong.
void	visitConstantMethodHandle(ConstantMethodHandle constantMethodHandle)	Visits a ConstantMethodHandle.
void	visitConstantMethodref(ConstantMethodref obj)	Visits a ConstantMethodref.
void	visitConstantMethodType(ConstantMethodType obj)	Visits a ConstantMethodType.
void	visitConstantModule(ConstantModule constantModule)	Visits a ConstantModule.
void	visitConstantNameAndType(ConstantNameAndType obj)	Visits a ConstantNameAndType.
void	visitConstantPackage(ConstantPackage constantPackage)	Visits a ConstantPackage.
void	visitConstantPool(ConstantPool obj)	Visits a ConstantPool.
void	visitConstantString(ConstantString obj)	Visits a ConstantString.
void	visitConstantUtf8(ConstantUtf8 obj)	Visits a ConstantUtf8.
void	visitConstantValue(ConstantValue obj)	Visits a ConstantValue attribute.
void	visitDeprecated(Deprecated obj)	Visits a Deprecated attribute.
void	visitEnclosingMethod(EnclosingMethod obj)	Visits an EnclosingMethod attribute.
void	visitExceptionTable(ExceptionTable obj)	Visits an ExceptionTable attribute.
void	visitInnerClass(InnerClass obj)	Visits an InnerClass.
void	visitInnerClasses(InnerClasses obj)	Visits an InnerClasses attribute.
void	visitLineNumber(LineNumber obj)	Visits a LineNumber.
void	visitLineNumberTable(LineNumberTable obj)	Visits a LineNumberTable attribute.
void	visitLocalVariable(LocalVariable obj)	Visits a LocalVariable.
void	visitLocalVariableTable(LocalVariableTable obj)	Visits a LocalVariableTable attribute.
void	visitLocalVariableTypeTable(LocalVariableTypeTable obj)	Visits a LocalVariableTypeTable attribute.
void	visitMethodParameter(MethodParameter obj)	Visits a MethodParameter.
void	visitMethodParameters(MethodParameters obj)	Visits a MethodParameters attribute.
void	visitModule(Module obj)	Visits a Module attribute.
void	visitModuleExports(ModuleExports obj)	Visits a ModuleExports entry.
void	visitModuleMainClass(ModuleMainClass obj)	Visits a ModuleMainClass attribute.
void	visitModuleOpens(ModuleOpens obj)	Visits a ModuleOpens entry.
void	visitModulePackages(ModulePackages obj)	Visits a ModulePackages attribute.
void	visitModuleProvides(ModuleProvides obj)	Visits a ModuleProvides entry.
void	visitModuleRequires(ModuleRequires obj)	Visits a ModuleRequires entry.
void	visitNestHost(NestHost obj)	Visits a NestHost attribute.
void	visitNestMembers(NestMembers obj)	Visits a NestMembers attribute.
void	visitParameterAnnotation(ParameterAnnotations obj)	Visits a ParameterAnnotations attribute.
void	visitParameterAnnotationEntry(ParameterAnnotationEntry parameterAnnotationEntry)	Visits a ParameterAnnotationEntry.
void	visitPermittedSubclasses(PermittedSubclasses obj)	Visits a PermittedSubclasses attribute.
void	visitSignature(Signature obj)	Visits a Signature attribute.
void	visitSourceFile(SourceFile obj)	Visits a SourceFile attribute.
void	visitSynthetic(Synthetic obj)	Visits a Synthetic attribute.
void	visitTypeAnnotations(TypeAnnotations obj)	Visits a RuntimeVisibleTypeAnnotations or RuntimeInvisibleTypeAnnotations attribute.
void	visitUnknown(Unknown obj)	Visits an Unknown attribute.

Methods inherited from class Object

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

Methods inherited from interface Visitor

visitRecord, visitRecordComponent

Modifier and Type	Method	Description
default void	visitRecord(Record obj)	Visits a Record object.
default void	visitRecordComponent(RecordComponentInfo record)	Visits a RecordComponentInfo object.

Constructor Details

BCELifier

public BCELifier(JavaClass clazz,
 OutputStream out)

Constructs a new instance.

Parameters:

clazz - Java class to "decompile".

out - where to print the Java program in UTF-8.

Method Details

main

public static void main(String[] argv)
                 throws Exception

Default main method.

Parameters:

argv - command line arguments.

Throws:

Exception - Thrown if an error occurs.

printFlags

public static String printFlags(int flags,
 BCELifier.FLAGS location)

Return a string with the flag settings

Parameters:

flags - The flags field to interpret.

location - The item type.

Returns:

The formatted string.

Since:

6.0 made public

start

public void start()

Start Java code generation

visitField

public void visitField(Field field)

Description copied from interface: Visitor

Visits a Field.

Specified by:

visitField in interface Visitor

Overrides:

visitField in class EmptyVisitor

Parameters:

field - The field.

visitJavaClass

public void visitJavaClass(JavaClass clazz)

Description copied from interface: Visitor

Visits a JavaClass.

Specified by:

visitJavaClass in interface Visitor

Overrides:

visitJavaClass in class EmptyVisitor

Parameters:

clazz - The class.

visitMethod

public void visitMethod(Method method)

Description copied from interface: Visitor

Visits a Method.

Specified by:

visitMethod in interface Visitor

Overrides:

visitMethod in class EmptyVisitor

Parameters:

method - The method.

visitStackMap

public void visitStackMap(StackMap stackMap)

Description copied from interface: Visitor

Visits a StackMap attribute.

Specified by:

visitStackMap in interface Visitor

Overrides:

visitStackMap in class EmptyVisitor

Parameters:

stackMap - The attribute.

visitStackMapEntry

public void visitStackMapEntry(StackMapEntry stackMapEntry)

Description copied from interface: Visitor

Visits a StackMapEntry.

Specified by:

visitStackMapEntry in interface Visitor

Overrides:

visitStackMapEntry in class EmptyVisitor

Parameters:

stackMapEntry - The entry.

visitStackMapType

public void visitStackMapType(StackMapType stackMapType)

Visits a StackMapType object.

Specified by:

visitStackMapType in interface Visitor

Overrides:

visitStackMapType in class EmptyVisitor

Parameters:

stackMapType - object to visit.

Since:

6.7.1